release(langgraph): 1.2.11 (#8595)

Bumps the minor-and-patch group with 7 updates in the /libs/langgraph
directory:

| Package | From | To |
| --- | --- | --- |
| [langchain-core](https://github.com/langchain-ai/langchain) | `1.4.8`
| `1.5.3` |
| [xxhash](https://github.com/ifduyue/python-xxhash) | `3.8.0` | `3.8.1`
|
| [syrupy](https://github.com/syrupy-project/syrupy) | `5.3.4` | `5.5.3`
|
| [redis](https://github.com/redis/redis-py) | `8.0.1` | `8.1.0` |
| [ruff](https://github.com/astral-sh/ruff) | `0.15.20` | `0.16.1` |
| [ty](https://github.com/astral-sh/ty) | `0.0.55` | `0.0.66` |
| [anyio](https://github.com/agronholm/anyio) | `4.14.1` | `4.14.2` |


Updates `langchain-core` from 1.4.8 to 1.5.3
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/langchain-ai/langchain/releases">langchain-core's
releases</a>.</em></p>
<blockquote>
<h2>langchain-core==1.5.3</h2>
<p>Changes since langchain-core==1.5.2</p>
<p>release(core): 1.5.3 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39145">#39145</a>)
fix(core): fall back to <code>LANGSMITH_API_KEY</code> for gateway (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39115">#39115</a>)</p>
<h2>langchain-core==1.5.2</h2>
<p>Changes since langchain-core==1.5.1</p>
<p>release(core): 1.5.2 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39108">#39108</a>)
fix(core): handle empty string in gateway env vars (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39107">#39107</a>)
chore: bump setuptools from 82.0.0 to 83.0.0 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39032">#39032</a>)
chore: bump jupyterlab from 4.5.9 to 4.5.10 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39033">#39033</a>)
chore: bump setuptools from 80.9.0 to 83.0.0 in /libs/text-splitters (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39029">#39029</a>)</p>
<h2>langchain-core==1.5.1</h2>
<p>Changes since langchain-core==1.5.0</p>
<p>release(core): 1.5.1 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39042">#39042</a>)
feat(anthropic,fireworks,openai): support langsmith gateway through env
var (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38742">#38742</a>)
fix(core): use <code>tool_call_schema</code> cache for
<code>BaseTool</code> token counting in
<code>count_tokens_approximately</code> (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39020">#39020</a>)</p>
<h2>langchain-core==1.5.0</h2>
<p>Changes since langchain-core==1.4.9</p>
<p>release(core): 1.5.0 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38978">#38978</a>)
feat(core): add <code>reasoning_effort</code> as a standard chat model
parameter (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38887">#38887</a>)
chore: bump soupsieve from 2.8 to 2.8.4 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38750">#38750</a>)
chore: bump mistune from 3.2.1 to 3.3.0 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38783">#38783</a>)</p>
<h2>langchain-core==1.4.9</h2>
<p>Changes since langchain-core==1.4.8</p>
<p>release(core): 1.4.9 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38728">#38728</a>)
fix(core): improve langsmith loader error messages (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35648">#35648</a>)
fix(core): output parser bugs in xml.py and pydantic.py (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35641">#35641</a>)
style(core): fix some ruff preview rules (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38656">#38656</a>)
fix(core): avoid <code>dict</code> shadowing in language models (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38480">#38480</a>)
fix(core): <code>_parse_google_docstring</code> mishandling continuation
lines with colons (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/35680">#35680</a>)
fix(core): add messages to bare <code>raise ValueError</code> calls (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38158">#38158</a>)
fix(core): use <code>asyncio.get_running_loop()</code> in async contexts
(<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38157">#38157</a>)
chore: bump langsmith from 0.8.0 to 0.8.18 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38319">#38319</a>)
chore: bump jupyterlab from 4.5.7 to 4.5.9 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38326">#38326</a>)
chore: bump vcrpy from 8.1.1 to 8.2.1 in /libs/core (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/38327">#38327</a>)</p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/langchain-ai/langchain/commit/01d8481ae3d457ec3751cbb0331ea3a4b720fa90"><code>01d8481</code></a>
release(core): 1.5.3 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39145">#39145</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/b8a6e36d3f810302c66065ea1c2892da000de550"><code>b8a6e36</code></a>
chore(model-profiles): refresh model profile data (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39141">#39141</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/cdca311de2958e497cfd823a45ddb770d0ef94c0"><code>cdca311</code></a>
fix(core): fall back to <code>LANGSMITH_API_KEY</code> for gateway (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39115">#39115</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/a5a8762436658b218dbfc5efff9e8ab8fabbe62f"><code>a5a8762</code></a>
ci: annotate uv bump workflow with PR links (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39112">#39112</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/557c0a986d5068085a945dcb3c9ce27257c4add8"><code>557c0a9</code></a>
chore(deps): bump uv to 0.12.0 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39111">#39111</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/835c85ae236a2d33cd11de4c98d28cbc6ebbd72f"><code>835c85a</code></a>
release(anthropic): 1.5.3 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39109">#39109</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/c1ab807b1f62ad04274c28f2b7d8c3141d8ba1f2"><code>c1ab807</code></a>
release(core): 1.5.2 (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39108">#39108</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/313223347f842274432d8a2968b4be407e2722d8"><code>3132233</code></a>
fix(anthropic): preserve empty thinking field in signature_delta
streaming (#...</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/b3a6d9a012681df8a8e33345c8255ca69ec0e437"><code>b3a6d9a</code></a>
chore(model-profiles): refresh model profile data (<a
href="https://redirect.github.com/langchain-ai/langchain/issues/39105">#39105</a>)</li>
<li><a
href="https://github.com/langchain-ai/langchain/commit/447b51abbccde236838524ee717682a0dd2a6c09"><code>447b51a</code></a>
fix(anthropic): strip unsupported fields from system message content
blocks (...</li>
<li>Additional commits viewable in <a
href="https://github.com/langchain-ai/langchain/compare/langchain-core==1.4.8...langchain-core==1.5.3">compare
view</a></li>
</ul>
</details>
<br />

Updates `xxhash` from 3.8.0 to 3.8.1
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/ifduyue/python-xxhash/releases">xxhash's
releases</a>.</em></p>
<blockquote>
<h2>v3.8.1</h2>
<ul>
<li>Register the &quot;benchmark&quot; pytest mark to avoid
PytestUnknownMarkWarning</li>
<li>Update C extension docstrings and remove stale comments</li>
</ul>
<hr />
<p>Full list of changes: <a
href="https://github.com/ifduyue/python-xxhash/compare/v3.8.0...v3.8.1">https://github.com/ifduyue/python-xxhash/compare/v3.8.0...v3.8.1</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/ifduyue/python-xxhash/blob/master/CHANGELOG.rst">xxhash's
changelog</a>.</em></p>
<blockquote>
<p>v3.8.1 2026-07-06</p>
<pre><code>
- Register the &quot;benchmark&quot; pytest mark to avoid
PytestUnknownMarkWarning
- Update C extension docstrings and remove stale comments
</code></pre>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/ifduyue/python-xxhash/commit/0a1adf7b6a5f26b821272985a0a987cca5446c23"><code>0a1adf7</code></a>
Release v3.8.1</li>
<li><a
href="https://github.com/ifduyue/python-xxhash/commit/aa419ca1478219b7ba2ad18a8fe05ca9d29288bc"><code>aa419ca</code></a>
Prepare 3.8.1</li>
<li><a
href="https://github.com/ifduyue/python-xxhash/commit/e26b770f19b5eabd1c58d098206e5c9adfcef5d1"><code>e26b770</code></a>
docs: update C extension docstrings and remove stale comments</li>
<li><a
href="https://github.com/ifduyue/python-xxhash/commit/aa69707513c4ba8c52a4bebc23f0aada7844decc"><code>aa69707</code></a>
Register the “benchmark” pytest mark</li>
<li>See full diff in <a
href="https://github.com/ifduyue/python-xxhash/compare/v3.8.0...v3.8.1">compare
view</a></li>
</ul>
</details>
<br />

Updates `syrupy` from 5.3.4 to 5.5.3
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/syrupy-project/syrupy/releases">syrupy's
releases</a>.</em></p>
<blockquote>
<h2>v5.5.3</h2>
<h2>What's Changed</h2>
<p>This release has no functional changes. It just fixes an issue where
the release tag pointed to the previous commit instead of the commit
with the updated pyproject.toml (see <a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1144">syrupy-project/syrupy#1144</a>).</p>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.5.2...v5.5.3">https://github.com/syrupy-project/syrupy/compare/v5.5.2...v5.5.3</a></p>
<h2>v5.5.2</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: Fix detecting <code>pytest-xdist</code> when loaded via
<code>PYTEST_PLUGINS</code> by <a
href="https://github.com/mgorny"><code>@​mgorny</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1142">syrupy-project/syrupy#1142</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/mgorny"><code>@​mgorny</code></a> made
their first contribution in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1142">syrupy-project/syrupy#1142</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.5.1...v5.5.2">https://github.com/syrupy-project/syrupy/compare/v5.5.1...v5.5.2</a></p>
<h2>v5.5.1</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: Defer registering <code>pytest-xdist</code> hook
<code>pytest_testnodedown</code> to avoid &quot;unknown hook&quot; error
by <a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1140">syrupy-project/syrupy#1140</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
made their first contribution in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1140">syrupy-project/syrupy#1140</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.5.0...v5.5.1">https://github.com/syrupy-project/syrupy/compare/v5.5.0...v5.5.1</a></p>
<h2>v5.5.0</h2>
<h2>What's Changed</h2>
<ul>
<li>feat: detect unused snapshots under pytest-xdist by <a
href="https://github.com/frenck"><code>@​frenck</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1132">syrupy-project/syrupy#1132</a></li>
</ul>
<blockquote>
<p><strong>NOTE</strong>: Test suites using pytest-xdist that previously
passed due to incomplete snapshot support may now fail if unused
snapshots are detected. You can use <code>--snapshot-warn-unused</code>
to downgrade unused snapshot detection from an error to a warning though
it's not recommended.</p>
</blockquote>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.4.0...v5.5.0">https://github.com/syrupy-project/syrupy/compare/v5.4.0...v5.5.0</a></p>
<h2>v5.4.0</h2>
<h2>What's Changed</h2>
<ul>
<li>feat: add --snapshot-no-cleanup to keep unused snapshots on update
by <a href="https://github.com/frenck"><code>@​frenck</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1126">syrupy-project/syrupy#1126</a></li>
<li>fix: honor boolean operators in -k snapshot selection by <a
href="https://github.com/frenck"><code>@​frenck</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1127">syrupy-project/syrupy#1127</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.3.4...v5.4.0">https://github.com/syrupy-project/syrupy/compare/v5.3.4...v5.4.0</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/syrupy-project/syrupy/blob/main/CHANGELOG.md">syrupy's
changelog</a>.</em></p>
<blockquote>
<h2><a
href="https://github.com/syrupy-project/syrupy/releases/tag/v5.5.3">v5.5.3</a>
(2026-07-11)</h2>
<h2>What's Changed</h2>
<ul>
<li>chore(deps): update astral-sh/setup-uv action to v8.3.0 by <a
href="https://github.com/renovate"><code>@​renovate</code></a>[bot] in
<a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1143">syrupy-project/syrupy#1143</a></li>
<li>chore(deps): update astral-sh/setup-uv action to v8.3.1 by <a
href="https://github.com/renovate"><code>@​renovate</code></a>[bot] in
<a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1145">syrupy-project/syrupy#1145</a></li>
<li>chore(deps): update dependency hypothesis to v6.156.2 by <a
href="https://github.com/renovate"><code>@​renovate</code></a>[bot] in
<a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1147">syrupy-project/syrupy#1147</a></li>
<li>chore(deps): update dependency mypy to v2.2.0 by <a
href="https://github.com/renovate"><code>@​renovate</code></a>[bot] in
<a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1148">syrupy-project/syrupy#1148</a></li>
<li>chore(deps): update dependency hypothesis to v6.156.3 by <a
href="https://github.com/renovate"><code>@​renovate</code></a>[bot] in
<a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1150">syrupy-project/syrupy#1150</a></li>
<li>chore: closes <a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1144">#1144</a>
by <a href="https://github.com/noahnu"><code>@​noahnu</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1146">syrupy-project/syrupy#1146</a></li>
<li>chore(deps): update astral-sh/setup-uv action to v8.3.2 by <a
href="https://github.com/renovate"><code>@​renovate</code></a>[bot] in
<a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1149">syrupy-project/syrupy#1149</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.5.2...v5.5.3">https://github.com/syrupy-project/syrupy/compare/v5.5.2...v5.5.3</a></p>
<h2><a
href="https://github.com/syrupy-project/syrupy/releases/tag/v5.5.2">v5.5.2</a>
(2026-07-08)</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: Fix detecting <code>pytest-xdist</code> when loaded via
<code>PYTEST_PLUGINS</code> by <a
href="https://github.com/mgorny"><code>@​mgorny</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1142">syrupy-project/syrupy#1142</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a href="https://github.com/mgorny"><code>@​mgorny</code></a> made
their first contribution in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1142">syrupy-project/syrupy#1142</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.5.1...v5.5.2">https://github.com/syrupy-project/syrupy/compare/v5.5.1...v5.5.2</a></p>
<h2><a
href="https://github.com/syrupy-project/syrupy/releases/tag/v5.5.1">v5.5.1</a>
(2026-07-06)</h2>
<h2>What's Changed</h2>
<ul>
<li>fix: Defer registering <code>pytest-xdist</code> hook
<code>pytest_testnodedown</code> to avoid &quot;unknown hook&quot; error
by <a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1140">syrupy-project/syrupy#1140</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/edgarrmondragon"><code>@​edgarrmondragon</code></a>
made their first contribution in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1140">syrupy-project/syrupy#1140</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.5.0...v5.5.1">https://github.com/syrupy-project/syrupy/compare/v5.5.0...v5.5.1</a></p>
<h2><a
href="https://github.com/syrupy-project/syrupy/releases/tag/v5.5.0">v5.5.0</a>
(2026-07-06)</h2>
<h2>What's Changed</h2>
<ul>
<li>feat: detect unused snapshots under pytest-xdist by <a
href="https://github.com/frenck"><code>@​frenck</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1132">syrupy-project/syrupy#1132</a></li>
</ul>
<blockquote>
<p><strong>NOTE</strong>: Test suites using pytest-xdist that previously
passed due to incomplete snapshot support may now fail if unused
snapshots are detected. You can use <code>--snapshot-warn-unused</code>
to downgrade unused snapshot detection from an error to a warning though
it's not recommended.</p>
</blockquote>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/syrupy-project/syrupy/compare/v5.4.0...v5.5.0">https://github.com/syrupy-project/syrupy/compare/v5.4.0...v5.5.0</a></p>
<h2><a
href="https://github.com/syrupy-project/syrupy/releases/tag/v5.4.0">v5.4.0</a>
(2026-07-01)</h2>
<h2>What's Changed</h2>
<ul>
<li>feat: add --snapshot-no-cleanup to keep unused snapshots on update
by <a href="https://github.com/frenck"><code>@​frenck</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1126">syrupy-project/syrupy#1126</a></li>
<li>fix: honor boolean operators in -k snapshot selection by <a
href="https://github.com/frenck"><code>@​frenck</code></a> in <a
href="https://redirect.github.com/syrupy-project/syrupy/pull/1127">syrupy-project/syrupy#1127</a></li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/3cd347306cf44db076d2e4f50f7dfd325d9b5a92"><code>3cd3473</code></a>
chore(release): 5.5.3 [skip ci]</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/fed7e9f69f4dd14b39360e626236c868147588d5"><code>fed7e9f</code></a>
chore(deps): update astral-sh/setup-uv action to v8.3.2 (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1149">#1149</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/443fc11bf67ce588753cd4518ef056463cfe651b"><code>443fc11</code></a>
chore: closes <a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1144">#1144</a>
(<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1146">#1146</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/56bf157ce4135bde78ecc49cfa9532ffa41659e8"><code>56bf157</code></a>
chore(deps): update dependency hypothesis to v6.156.3 (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1150">#1150</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/f9c725a5653677bfcafb53645c9a078f3aa79d87"><code>f9c725a</code></a>
chore(deps): update dependency mypy to v2.2.0 (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1148">#1148</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/3af2ccf2feeadb3a0d4e3f418d22ad3395725c80"><code>3af2ccf</code></a>
chore(deps): update dependency hypothesis to v6.156.2 (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1147">#1147</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/feaa22ca4c211dfcdd8d0d048112531fd6cb344c"><code>feaa22c</code></a>
chore(deps): update astral-sh/setup-uv action to v8.3.1 (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1145">#1145</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/5c59701e411922a464497398f5df25d76f2f9dcd"><code>5c59701</code></a>
chore(deps): update astral-sh/setup-uv action to v8.3.0 (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1143">#1143</a>)</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/1cbf7167ff114e3012b1c139661777c1a0b692ee"><code>1cbf716</code></a>
chore(release): 5.5.2 [skip ci]</li>
<li><a
href="https://github.com/syrupy-project/syrupy/commit/4f83490d2ebf4ae22aeba6d9946979640151aa34"><code>4f83490</code></a>
fix: Fix detecting <code>pytest-xdist</code> when loaded via
<code>PYTEST_PLUGINS</code> (<a
href="https://redirect.github.com/syrupy-project/syrupy/issues/1142">#1142</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/syrupy-project/syrupy/compare/v5.3.4...v5.5.3">compare
view</a></li>
</ul>
</details>
<br />

Updates `redis` from 8.0.1 to 8.1.0
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/redis/redis-py/releases">redis's
releases</a>.</em></p>
<blockquote>
<h2>8.1.0</h2>
<h1>Changes</h1>
<h2>✨ Highlights</h2>
<h3>Async maintenance notifications</h3>
<p>redis-py now supports server-pushed <strong>maintenance
notifications</strong> in the asyncio stack for both
standalone and cluster clients, bringing the async client to parity with
the sync implementation.
When a Redis deployment signals maintenance events (such as node
migration or failover windows), the
async client reacts through the maintenance-notifications handler
(<code>redis/maint_notifications.py</code> and
its async integration under <code>redis/asyncio/</code>), allowing
applications to adapt connection handling
during maintenance without downtime. (<a
href="https://redirect.github.com/redis/redis-py/issues/4177">#4177</a>)</p>
<h3>Expanded command coverage</h3>
<p>This release adds a batch of new command surfaces across core data
types and modules:</p>
<ul>
<li><strong>Lists</strong> — <code>LMOVEM</code> / <code>BLMOVEM</code>
for moving multiple elements between lists (<a
href="https://redirect.github.com/redis/redis-py/issues/4174">#4174</a>).</li>
<li><strong>Sets</strong> — <code>SDIFFCARD</code> and
<code>SUNIONCARD</code> cardinality commands (<a
href="https://redirect.github.com/redis/redis-py/issues/4171">#4171</a>).</li>
<li><strong>Streams</strong> — <code>MAXCOUNT</code> /
<code>MAXSIZE</code> options for <code>XREAD</code> and
<code>XREADGROUP</code> (<a
href="https://redirect.github.com/redis/redis-py/issues/4173">#4173</a>).</li>
<li><strong>Time Series</strong> — <code>TS.READ</code> (<a
href="https://redirect.github.com/redis/redis-py/issues/4170">#4170</a>),
<code>TS.QUERYLABELS</code> (<a
href="https://redirect.github.com/redis/redis-py/issues/4197">#4197</a>),
<code>TS.NRANGE</code> / <code>TS.NREVRANGE</code> (<a
href="https://redirect.github.com/redis/redis-py/issues/4163">#4163</a>),
and an <code>exclude_empty</code> (<code>EXCLUDEEMPTY</code>) option for
<code>TS.MRANGE</code> / <code>TS.MREVRANGE</code> (<a
href="https://redirect.github.com/redis/redis-py/issues/4188">#4188</a>).</li>
<li><strong>Search</strong> — <code>FT.ALIASLIST</code> (<a
href="https://redirect.github.com/redis/redis-py/issues/4198">#4198</a>)
and a <code>COLLECT</code> reducer for aggregations (<a
href="https://redirect.github.com/redis/redis-py/issues/4179">#4179</a>).</li>
<li><strong>Sentinel</strong> — replica sentinel aliases (<a
href="https://redirect.github.com/redis/redis-py/issues/4127">#4127</a>).</li>
</ul>
<h2>🚀 New Features</h2>
<ul>
<li>Add replica sentinel aliases (<a
href="https://redirect.github.com/redis/redis-py/issues/4127">#4127</a>)</li>
<li>Add TS.NRANGE and TS.NREVRANGE support to the timeseries command
surface (<a
href="https://redirect.github.com/redis/redis-py/issues/4163">#4163</a>)</li>
<li>feat: add TS.READ command support to the timeseries module (<a
href="https://redirect.github.com/redis/redis-py/issues/4170">#4170</a>)</li>
<li>feat: add SDIFFCARD and SUNIONCARD command support (<a
href="https://redirect.github.com/redis/redis-py/issues/4171">#4171</a>)</li>
<li>feat: add MAXCOUNT/MAXSIZE support to XREAD and XREADGROUP (<a
href="https://redirect.github.com/redis/redis-py/issues/4173">#4173</a>)</li>
<li>feat: add LMOVEM and BLMOVEM commands for moving multiple list
elements (<a
href="https://redirect.github.com/redis/redis-py/issues/4174">#4174</a>)</li>
<li>feat: add async maintenance-notifications support for standalone and
cluster clients (<a
href="https://redirect.github.com/redis/redis-py/issues/4177">#4177</a>)</li>
<li>feat: add COLLECT reducer support to search aggregations (<a
href="https://redirect.github.com/redis/redis-py/issues/4179">#4179</a>)</li>
<li>feat: add exclude_empty (EXCLUDEEMPTY) option to TS.MRANGE and
TS.MREVRANGE (<a
href="https://redirect.github.com/redis/redis-py/issues/4188">#4188</a>)</li>
<li>feat: add TS.QUERYLABELS support to the timeseries command surface
(<a
href="https://redirect.github.com/redis/redis-py/issues/4197">#4197</a>)</li>
<li>feat: add FT.ALIASLIST support (<a
href="https://redirect.github.com/redis/redis-py/issues/4198">#4198</a>)</li>
</ul>
<h2>⚠️ Experimental</h2>
<ul>
<li>feat: add client-side HIMPORT fieldset support for standalone and
cluster clients (<a
href="https://redirect.github.com/redis/redis-py/issues/4205">#4205</a>)</li>
</ul>
<p>The feature considered unstable and <strong>public API might be
changed in the future minor version</strong></p>
<h2>🐛 Bug Fixes</h2>
<ul>
<li>fix: detect closed pooled connection without consuming pending push
data (RESP3 + hiredis) (<a
href="https://redirect.github.com/redis/redis-py/issues/4156">#4156</a>)</li>
<li>Fix Sentinel pool capacity loss after failover (<a
href="https://redirect.github.com/redis/redis-py/issues/4193">#4193</a>)</li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/redis/redis-py/commit/e013126df18e476fbb8b8215f040f39bd3242683"><code>e013126</code></a>
Testing with 8.10 GA (<a
href="https://redirect.github.com/redis/redis-py/issues/4227">#4227</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/059d1e97d88dd7ed516628e0a9765ab8e0e299f1"><code>059d1e9</code></a>
Fixed TS.NRANGE commands to correctly apply aggregators (<a
href="https://redirect.github.com/redis/redis-py/issues/4225">#4225</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/d486a0a982dcdf316006474dc286ca65cbec5a9f"><code>d486a0a</code></a>
Fix FIELDNAME alias dropping first character of un-prefixed fields (<a
href="https://redirect.github.com/redis/redis-py/issues/4224">#4224</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/fb931042420baaa5fbb9021955e444f7afa66dc2"><code>fb93104</code></a>
feat: add client-side HIMPORT fieldset support for standalone and
cluster cli...</li>
<li><a
href="https://github.com/redis/redis-py/commit/9197609f48eb9713411a50534ca48210486a4bf9"><code>9197609</code></a>
Fix lat/lon swap in search querystring geo() helper (<a
href="https://redirect.github.com/redis/redis-py/issues/4223">#4223</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/14714a0812d3ff03ad34c89ce6f79e287a04e9fb"><code>14714a0</code></a>
fix: Fixed double decoding issue with unquote() (<a
href="https://redirect.github.com/redis/redis-py/issues/4222">#4222</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/227280a939718d09ff9d7c41f9785ffdc21bdc2a"><code>227280a</code></a>
Update lib version to 8.1.0</li>
<li><a
href="https://github.com/redis/redis-py/commit/88d16d0db10c852d1d292628b2c832f1ed117056"><code>88d16d0</code></a>
Decode ACL LOG string values on the default RESP3 legacy callback (<a
href="https://redirect.github.com/redis/redis-py/issues/4201">#4201</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/599fd75ca7d0745928280ff3a64ccd224dbf2b76"><code>599fd75</code></a>
feat: add FT.ALIASLIST support (<a
href="https://redirect.github.com/redis/redis-py/issues/4198">#4198</a>)</li>
<li><a
href="https://github.com/redis/redis-py/commit/71e275e6eae94d202b49bccce10ef0d2a59050e7"><code>71e275e</code></a>
test: add VectorField RERANK serialization tests for sync and async
search (#...</li>
<li>Additional commits viewable in <a
href="https://github.com/redis/redis-py/compare/v8.0.1...v8.1.0">compare
view</a></li>
</ul>
</details>
<br />

Updates `ruff` from 0.15.20 to 0.16.1
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/astral-sh/ruff/releases">ruff's
releases</a>.</em></p>
<blockquote>
<h2>0.16.1</h2>
<h2>Release Notes</h2>
<p>Released on 2026-07-30.</p>
<h3>Preview features</h3>
<ul>
<li>Add an option to opt out of human-readable names (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27160">#27160</a>)</li>
<li>[<code>flake8-pytest-style</code>] Make fixes safe by default and
unsafe only when comments are present (<code>PT018</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27201">#27201</a>)</li>
<li>[<code>pyupgrade</code>] Skip fix when a defaulted
<code>TypeVar</code> precedes a non-defaulted one (<code>UP040</code>,
<code>UP046</code>, <code>UP047</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27133">#27133</a>)</li>
<li>[<code>ruff</code>] Fix false positive with unpacked arguments
(<code>RUF065</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26959">#26959</a>)</li>
</ul>
<h3>Bug fixes</h3>
<ul>
<li>Bump <code>gen-lsp-types</code> to gracefully handle unknown
enumeration values in LSP messages (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27230">#27230</a>)</li>
<li>[<code>flake8-bugbear</code>] Mark <code>range</code> as immutable
(<code>B008</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27247">#27247</a>)</li>
<li>[<code>flake8-comprehensions</code>] NFKC-normalize keyword names in
<code>C408</code> fix (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26813">#26813</a>)</li>
<li>[<code>flake8-return</code>] Fix false positive when variable is
read in <code>finally</code> clause (<code>RET504</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/25441">#25441</a>)</li>
<li>[<code>pydocstyle</code>] Skip section detection inside RST
directive bodies (<code>D214</code>, <code>D405</code>,
<code>D413</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/23635">#23635</a>)</li>
<li>[<code>refurb</code>] Parenthesize <code>yield</code> arguments in
the <code>FURB192</code> fix (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27192">#27192</a>)</li>
</ul>
<h3>Rule changes</h3>
<ul>
<li>[<code>flake8-pytest-style</code>] Mark <code>PT022</code> fixes as
unsafe (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26440">#26440</a>)</li>
<li>[<code>refurb</code>] Mark fixes that remove unknown separators as
unsafe (<code>FURB105</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27200">#27200</a>)</li>
</ul>
<h3>Server</h3>
<ul>
<li>Fix indexing of excluded nested Ruff workspaces (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27303">#27303</a>)</li>
<li>Lint TOML files in the LSP (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26862">#26862</a>)</li>
</ul>
<h3>Documentation</h3>
<ul>
<li>Cover <code>pycon</code> Markdown formatting (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27153">#27153</a>)</li>
<li>[<code>flake8-bandit</code>] Document <code>TYPE_CHECKING</code>
exception (<code>S101</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27004">#27004</a>)</li>
<li>[<code>flake8-import-conventions</code>] Document that
<code>extend-aliases</code> can override default aliases (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27191">#27191</a>)</li>
<li>[<code>pylint</code>] Add missing fix safety gotchas for
<code>non-augmented-assignment</code> (<code>PLR6104</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27250">#27250</a>)</li>
</ul>
<h3>Other changes</h3>
<ul>
<li>Reduce syntax error noise by swallowing dedents like indents (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27170">#27170</a>)</li>
<li>Vendor latest annotate-snippets (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27033">#27033</a>)</li>
</ul>
<h3>Contributors</h3>
<ul>
<li><a href="https://github.com/bxff"><code>@​bxff</code></a></li>
<li><a
href="https://github.com/anishgirianish"><code>@​anishgirianish</code></a></li>
<li><a href="https://github.com/Avasam"><code>@​Avasam</code></a></li>
<li><a href="https://github.com/epage"><code>@​epage</code></a></li>
<li><a href="https://github.com/LHMQ878"><code>@​LHMQ878</code></a></li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md">ruff's
changelog</a>.</em></p>
<blockquote>
<h2>0.16.1</h2>
<p>Released on 2026-07-30.</p>
<h3>Preview features</h3>
<ul>
<li>Add an option to opt out of human-readable names (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27160">#27160</a>)</li>
<li>[<code>flake8-pytest-style</code>] Make fixes safe by default and
unsafe only when comments are present (<code>PT018</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27201">#27201</a>)</li>
<li>[<code>pyupgrade</code>] Skip fix when a defaulted
<code>TypeVar</code> precedes a non-defaulted one (<code>UP040</code>,
<code>UP046</code>, <code>UP047</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27133">#27133</a>)</li>
<li>[<code>ruff</code>] Fix false positive with unpacked arguments
(<code>RUF065</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26959">#26959</a>)</li>
</ul>
<h3>Bug fixes</h3>
<ul>
<li>Bump <code>gen-lsp-types</code> to gracefully handle unknown
enumeration values in LSP messages (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27230">#27230</a>)</li>
<li>[<code>flake8-bugbear</code>] Mark <code>range</code> as immutable
(<code>B008</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27247">#27247</a>)</li>
<li>[<code>flake8-comprehensions</code>] NFKC-normalize keyword names in
<code>C408</code> fix (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26813">#26813</a>)</li>
<li>[<code>flake8-return</code>] Fix false positive when variable is
read in <code>finally</code> clause (<code>RET504</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/25441">#25441</a>)</li>
<li>[<code>pydocstyle</code>] Skip section detection inside RST
directive bodies (<code>D214</code>, <code>D405</code>,
<code>D413</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/23635">#23635</a>)</li>
<li>[<code>refurb</code>] Parenthesize <code>yield</code> arguments in
the <code>FURB192</code> fix (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27192">#27192</a>)</li>
</ul>
<h3>Rule changes</h3>
<ul>
<li>[<code>flake8-pytest-style</code>] Mark <code>PT022</code> fixes as
unsafe (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26440">#26440</a>)</li>
<li>[<code>refurb</code>] Mark fixes that remove unknown separators as
unsafe (<code>FURB105</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27200">#27200</a>)</li>
</ul>
<h3>Server</h3>
<ul>
<li>Fix indexing of excluded nested Ruff workspaces (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27303">#27303</a>)</li>
<li>Lint TOML files in the LSP (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26862">#26862</a>)</li>
</ul>
<h3>Documentation</h3>
<ul>
<li>Cover <code>pycon</code> Markdown formatting (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27153">#27153</a>)</li>
<li>[<code>flake8-bandit</code>] Document <code>TYPE_CHECKING</code>
exception (<code>S101</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27004">#27004</a>)</li>
<li>[<code>flake8-import-conventions</code>] Document that
<code>extend-aliases</code> can override default aliases (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27191">#27191</a>)</li>
<li>[<code>pylint</code>] Add missing fix safety gotchas for
<code>non-augmented-assignment</code> (<code>PLR6104</code>) (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27250">#27250</a>)</li>
</ul>
<h3>Other changes</h3>
<ul>
<li>Reduce syntax error noise by swallowing dedents like indents (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27170">#27170</a>)</li>
<li>Vendor latest annotate-snippets (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27033">#27033</a>)</li>
</ul>
<h3>Contributors</h3>
<ul>
<li><a href="https://github.com/bxff"><code>@​bxff</code></a></li>
<li><a
href="https://github.com/anishgirianish"><code>@​anishgirianish</code></a></li>
<li><a href="https://github.com/Avasam"><code>@​Avasam</code></a></li>
<li><a href="https://github.com/epage"><code>@​epage</code></a></li>
<li><a href="https://github.com/LHMQ878"><code>@​LHMQ878</code></a></li>
<li><a
href="https://github.com/MichaReiser"><code>@​MichaReiser</code></a></li>
</ul>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/astral-sh/ruff/commit/80790b348b5188e7fc253665540f442c6ec7dd05"><code>80790b3</code></a>
Bump 0.16.1 (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27330">#27330</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/63830f3e97b56ca3be0dd8f1092f76c4acc63213"><code>63830f3</code></a>
[ty] Borrow from constraint set storage less often (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27328">#27328</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/f40dca98a7f1b6fff0cee5ecf1e6364d5a8bdc15"><code>f40dca9</code></a>
[ty] Preserve forwarded expanded-variadic diagnostic sources (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27266">#27266</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/0d804975a2645d6e4a795cf501fd764b88aa47e3"><code>0d80497</code></a>
Lint TOML files in the LSP (<a
href="https://redirect.github.com/astral-sh/ruff/issues/26862">#26862</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/d91586bd5b30f77f6614d57b73fc7dbea9051a0e"><code>d91586b</code></a>
Update prek dependencies (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27293">#27293</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/7da4b8b8d78fd6df2b3e06d8466d9cd49822900d"><code>7da4b8b</code></a>
[ty] Respect bounds and constraints in generic materializations (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27228">#27228</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/b20daf741241a6829ff8963a203f7847561deb62"><code>b20daf7</code></a>
[ty] refactor: add helper function to send partial results (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27249">#27249</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/4d4c8fa1c75b00561ea24eefefb13eb5ff80e01f"><code>4d4c8fa</code></a>
[ty] Emit diagnostic when specializing a non-generic class (<a
href="https://redirect.github.com/astral-sh/ruff/issues/26883">#26883</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/7c3e2db97deb5c5edd6e4303403ef6caf2bde8be"><code>7c3e2db</code></a>
[ty] Fix enum class container assignability (<a
href="https://redirect.github.com/astral-sh/ruff/issues/27318">#27318</a>)</li>
<li><a
href="https://github.com/astral-sh/ruff/commit/d5ef97fcd03e108f7510f84b8ed85bb4051311fe"><code>d5ef97f</code></a>
[<code>flake8-return</code>] Fix false positive when variable is read in
<code>finally</code> claus...</li>
<li>Additional commits viewable in <a
href="https://github.com/astral-sh/ruff/compare/0.15.20...0.16.1">compare
view</a></li>
</ul>
</details>
<br />

Updates `ty` from 0.0.55 to 0.0.66
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/astral-sh/ty/releases">ty's
releases</a>.</em></p>
<blockquote>
<h2>0.0.66</h2>
<h2>Release Notes</h2>
<p>Released on 2026-08-03.</p>
<h3>LSP server</h3>
<ul>
<li>Index <code>with</code>-statement targets as symbols (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27256">#27256</a>)</li>
<li>Trigger signature help after completing callable with parentheses
(<a
href="https://redirect.github.com/astral-sh/ruff/pull/27084">#27084</a>)</li>
</ul>
<h3>Library support</h3>
<ul>
<li>Pydantic: Recognize models installed on extra search paths (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27429">#27429</a>)</li>
</ul>
<h3>Diagnostics</h3>
<ul>
<li>Detect <code>__aenter__</code> and <code>__aexit__</code> that do
not return awaitables (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27414">#27414</a>)</li>
<li>Diagnose dataclass fields after inherited defaults (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27327">#27327</a>)</li>
<li>Emit diagnostic when specializing a non-generic class (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26883">#26883</a>)</li>
<li>Improve error context for incompatible callable signatures (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27422">#27422</a>)</li>
<li>Preserve forwarded expanded-variadic diagnostic sources (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27266">#27266</a>)</li>
</ul>
<h3>Core type checking</h3>
<ul>
<li>Avoid over-materializing user-defined <code>TypeIs</code> return
types (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26864">#26864</a>)</li>
<li>Fix enum class container assignability (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27318">#27318</a>)</li>
<li>Hide stub-only helpers from implicit builtin lookup (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27423">#27423</a>)</li>
<li>Move <code>Unknown</code> out of the experimental
<code>ty_extensions</code> API (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27430">#27430</a>)</li>
<li>Preserve <code>TypeVarTuple</code> context during
<code>Generic</code> recovery (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27381">#27381</a>)</li>
<li>Preserve exact numeric types in covariant collections (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27311">#27311</a>)</li>
<li>Reject <code>ClassVar</code> and <code>Final</code> qualifiers in
<code>NamedTuple</code> fields (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27380">#27380</a>)</li>
<li>Reject out-of-scope <code>ParamSpec</code> components (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27378">#27378</a>)</li>
<li>Reject specializing non-generic subclasses (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27377">#27377</a>)</li>
<li>Respect bounds and constraints in generic materializations (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27228">#27228</a>)</li>
<li>Sync vendored typeshed stubs (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27401">#27401</a>).
<a
href="https://github.com/python/typeshed/compare/b00c387c669cb50d5d388d77b74c2e832e147fe8...1b116673774d062a4af7b0a0b3d05533a6be55d0">Typeshed
diff</a></li>
</ul>
<h3>Contributors</h3>
<ul>
<li><a
href="https://github.com/dhruvmanila"><code>@​dhruvmanila</code></a></li>
<li><a href="https://github.com/carljm"><code>@​carljm</code></a></li>
<li><a
href="https://github.com/Punisheroot"><code>@​Punisheroot</code></a></li>
<li><a
href="https://github.com/AlexWaygood"><code>@​AlexWaygood</code></a></li>
<li><a
href="https://github.com/cheparity"><code>@​cheparity</code></a></li>
<li><a
href="https://github.com/BitWeaverDev"><code>@​BitWeaverDev</code></a></li>
<li><a
href="https://github.com/charliermarsh"><code>@​charliermarsh</code></a></li>
<li><a href="https://github.com/ribru17"><code>@​ribru17</code></a></li>
<li><a href="https://github.com/sharkdp"><code>@​sharkdp</code></a></li>
</ul>
<h2>Install ty 0.0.66</h2>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/astral-sh/ty/blob/main/CHANGELOG.md">ty's
changelog</a>.</em></p>
<blockquote>
<h2>0.0.66</h2>
<p>Released on 2026-08-03.</p>
<h3>LSP server</h3>
<ul>
<li>Index <code>with</code>-statement targets as symbols (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27256">#27256</a>)</li>
<li>Trigger signature help after completing callable with parentheses
(<a
href="https://redirect.github.com/astral-sh/ruff/pull/27084">#27084</a>)</li>
</ul>
<h3>Library support</h3>
<ul>
<li>Pydantic: Recognize models installed on extra search paths (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27429">#27429</a>)</li>
</ul>
<h3>Diagnostics</h3>
<ul>
<li>Detect <code>__aenter__</code> and <code>__aexit__</code> that do
not return awaitables (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27414">#27414</a>)</li>
<li>Diagnose dataclass fields after inherited defaults (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27327">#27327</a>)</li>
<li>Emit diagnostic when specializing a non-generic class (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26883">#26883</a>)</li>
<li>Improve error context for incompatible callable signatures (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27422">#27422</a>)</li>
<li>Preserve forwarded expanded-variadic diagnostic sources (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27266">#27266</a>)</li>
</ul>
<h3>Core type checking</h3>
<ul>
<li>Avoid over-materializing user-defined <code>TypeIs</code> return
types (<a
href="https://redirect.github.com/astral-sh/ruff/pull/26864">#26864</a>)</li>
<li>Fix enum class container assignability (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27318">#27318</a>)</li>
<li>Hide stub-only helpers from implicit builtin lookup (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27423">#27423</a>)</li>
<li>Move <code>Unknown</code> out of the experimental
<code>ty_extensions</code> API (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27430">#27430</a>)</li>
<li>Preserve <code>TypeVarTuple</code> context during
<code>Generic</code> recovery (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27381">#27381</a>)</li>
<li>Preserve exact numeric types in covariant collections (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27311">#27311</a>)</li>
<li>Reject <code>ClassVar</code> and <code>Final</code> qualifiers in
<code>NamedTuple</code> fields (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27380">#27380</a>)</li>
<li>Reject out-of-scope <code>ParamSpec</code> components (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27378">#27378</a>)</li>
<li>Reject specializing non-generic subclasses (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27377">#27377</a>)</li>
<li>Respect bounds and constraints in generic materializations (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27228">#27228</a>)</li>
<li>Sync vendored typeshed stubs (<a
href="https://redirect.github.com/astral-sh/ruff/pull/27401">#27401</a>).
<a
href="https://github.com/python/typeshed/compare/b00c387c669cb50d5d388d77b74c2e832e147fe8...1b116673774d062a4af7b0a0b3d05533a6be55d0">Typeshed
diff</a></li>
</ul>
<h3>Contributors</h3>
<ul>
<li><a
href="https://github.com/dhruvmanila"><code>@​dhruvmanila</code></a></li>
<li><a href="https://github.com/carljm"><code>@​carljm</code></a></li>
<li><a
href="https://github.com/Punisheroot"><code>@​Punisheroot</code></a></li>
<li><a
href="https://github.com/AlexWaygood"><code>@​AlexWaygood</code></a></li>
<li><a
href="https://github.com/cheparity"><code>@​cheparity</code></a></li>
<li><a
href="https://github.com/BitWeaverDev"><code>@​BitWeaverDev</code></a></li>
<li><a
href="https://github.com/charliermarsh"><code>@​charliermarsh</code></a></li>
<li><a href="https://github.com/ribru17"><code>@​ribru17</code></a></li>
<li><a href="https://github.com/sharkdp"><code>@​sharkdp</code></a></li>
</ul>
<h2>0.0.65</h2>
<p>Released on 2026-07-29.</p>
<!-- raw HTML omitted -->
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/astral-sh/ty/commit/3e28e58af75c3b16403c05ab401ae7347b65c5e2"><code>3e28e58</code></a>
Bump version to 0.0.66 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4166">#4166</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/87de836dfef2d3e1990440752e30e24cfb572f4e"><code>87de836</code></a>
Bump version to 0.0.65 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4113">#4113</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/d784bad352f4640e7f788eac4dfb0353ca199902"><code>d784bad</code></a>
README: Add link to Stable milestone (<a
href="https://redirect.github.com/astral-sh/ty/issues/4112">#4112</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/b4c1978dbdf18501ed03139e33ee8afaef251ec3"><code>b4c1978</code></a>
Update actions/setup-python action to v7 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4110">#4110</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/8d216a39dad99c4443396a08a77da00502cd7e58"><code>8d216a3</code></a>
Update actions/checkout action to v7.0.1 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4107">#4107</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/06f44e9039cb2764346c4bceaff4021ac143de9e"><code>06f44e9</code></a>
Update dependency prek to v0.4.10 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4108">#4108</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/b3665fde4804424576a30078bc0b7c101c5e2242"><code>b3665fd</code></a>
Update prek dependencies (<a
href="https://redirect.github.com/astral-sh/ty/issues/4109">#4109</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/5e64a131b436a4e1f40e6317c526f4fc73fab38b"><code>5e64a13</code></a>
Bump version to 0.0.64 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4097">#4097</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/46f4915e67aad965b1b4e7478a75378e8e52ff6d"><code>46f4915</code></a>
Bump version to 0.0.63 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4071">#4071</a>)</li>
<li><a
href="https://github.com/astral-sh/ty/commit/df75992e7fd0cc73cb0f66e864df3f6e4fc4e1a6"><code>df75992</code></a>
Bump version to 0.0.62 (<a
href="https://redirect.github.com/astral-sh/ty/issues/4057">#4057</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/astral-sh/ty/compare/0.0.55...0.0.66">compare
view</a></li>
</ul>
</details>
<br />

Updates `anyio` from 4.14.1 to 4.14.2
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/agronholm/anyio/releases">anyio's
releases</a>.</em></p>
<blockquote>
<h2>4.14.2</h2>
<ul>
<li>Changed <code>ByteReceiveStream.receive()</code> implementations to
raise a <code>ValueError</code> when <code>max_bytes</code> is not a
positive integer (<a
href="https://redirect.github.com/agronholm/anyio/pull/1191">#1191</a>)</li>
<li>Fixed <code>CapacityLimiter.total_tokens</code> rejecting
<code>float(&quot;inf&quot;)</code> when the limiter was instantiated
outside of an event loop. The adapter setter checked for infinity by
identity (<code>value is math.inf</code>), so only the exact
<code>math.inf</code> singleton was accepted, while every backend setter
(using <code>math.isinf()</code>) accepts any positive infinity (<a
href="https://redirect.github.com/agronholm/anyio/pull/1189">#1189</a>;
PR by <a
href="https://github.com/greymoth-jp"><code>@​greymoth-jp</code></a>).</li>
<li>Fixed <code>to_process.run_sync()</code> deadlocking when the worker
function writes enough data to <code>sys.stderr</code> to fill the
(undrained) pipe buffer. The worker process now redirects
<code>sys.stderr</code> to <code>os.devnull</code> as well, matching the
documented behavior</li>
<li>Fixed <code>TLSStream.wrap()</code> matching an internationalized
(unicode) host name against the peer certificate using IDNA 2003 (via
the standard library) instead of IDNA 2008, which could cause the host
name to be matched against the wrong certificate (<a
href="https://redirect.github.com/agronholm/anyio/pull/1208">#1208</a>)</li>
<li>Fixed <code>anyio.open_process()</code> (and
<code>run_process()</code>) ignoring the <code>extra_groups</code>
argument, as it mistakenly passed the value of the <code>group</code>
argument instead (<a
href="https://redirect.github.com/agronholm/anyio/pull/1209">#1209</a>)</li>
<li>Fixed <code>CapacityLimiter.acquire_nowait()</code> and
<code>CapacityLimiter.acquire_nowait_on_behalf_of()</code> raising
<code>trio.WouldBlock</code> instead of <code>anyio.WouldBlock</code> on
the <code>trio</code> backend when there are no tokens available (<a
href="https://redirect.github.com/agronholm/anyio/pull/1218">#1218</a>)</li>
<li>Fixed <code>CapacityLimiter</code> on the asyncio backend
over-granting tokens (<code>borrowed_tokens</code> exceeding
<code>total_tokens</code> and <code>available_tokens</code> going
negative) when a non-blocking acquire was made in the window between a
token being released and the notified waiter resuming. The freed token
is now reserved for the woken waiter right away, so the non-blocking
acquire correctly raises <code>WouldBlock</code> (<a
href="https://redirect.github.com/agronholm/anyio/issues/1170">#1170</a>;
PR by <a
href="https://github.com/gaoflow"><code>@​gaoflow</code></a>)</li>
<li>Fixed unnecessary CPU spin when delivering cancellation from
<code>CancelScope</code> on asyncio under certain conditions, including
improper cancel scope nesting (<a
href="https://redirect.github.com/agronholm/anyio/issues/1111">#1111</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/agronholm/anyio/commit/c384f99687c64c59ed8a11c3a0f11a2d57daff71"><code>c384f99</code></a>
Bumped up the version</li>
<li><a
href="https://github.com/agronholm/anyio/commit/dbba29d1ade7936f18fb71ba24aa92978673482a"><code>dbba29d</code></a>
Fixed 100% CPU spin on cancel scope misuse (<a
href="https://redirect.github.com/agronholm/anyio/issues/1217">#1217</a>)</li>
<li><a
href="https://github.com/agronholm/anyio/commit/6bbc6c33caabc13af5bc4256f745027cf8d5d7b8"><code>6bbc6c3</code></a>
Fix CapacityLimiter over-granting tokens on asyncio (<a
href="https://redirect.github.com/agronholm/anyio/issues/1172">#1172</a>)</li>
<li><a
href="https://github.com/agronholm/anyio/commit/6f82b2537cbbe98f3df3f295499056ab7de0b15b"><code>6f82b25</code></a>
Refactored TestTLSStream.test_receive_invalid_max_bytes() to be less
flaky</li>
<li><a
href="https://github.com/agronholm/anyio/commit/be24b0414f67f604bcbdd5ea3bcc56ab920d872e"><code>be24b04</code></a>
Relaxed timeouts to fix test flakiness</li>
<li><a
href="https://github.com/agronholm/anyio/commit/81135065749b4f60c06619b9caaf0a11871c1ddf"><code>8113506</code></a>
Fix test flakiness caused by slow callback duration logging</li>
<li><a
href="https://github.com/agronholm/anyio/commit/1e988b617b69588e33fecb75e36a9837245f562f"><code>1e988b6</code></a>
Fixed CapacityLimiter raising trio.WouldBlock instead of
anyio.WouldBlock (<a
href="https://redirect.github.com/agronholm/anyio/issues/1">#1</a>...</li>
<li><a
href="https://github.com/agronholm/anyio/commit/44713f345cd29dd4e7d76553c134543a1296cc62"><code>44713f3</code></a>
Pin setup-uv to a commit sha across downstream jobs (<a
href="https://redirect.github.com/agronholm/anyio/issues/1213">#1213</a>)</li>
<li><a
href="https://github.com/agronholm/anyio/commit/f1b7301c8264b0d2e8d24a5788fd29e93dea4040"><code>f1b7301</code></a>
Fixed stderr writes in a worker subprocess causing a deadlock (<a
href="https://redirect.github.com/agronholm/anyio/issues/1207">#1207</a>)</li>
<li><a
href="https://github.com/agronholm/anyio/commit/212be93c2cf2c841e753e95e5e2c543ee7feca90"><code>212be93</code></a>
Fix flaky test_tcp_listener_same_port using a hardcoded port (<a
href="https://redirect.github.com/agronholm/anyio/issues/1206">#1206</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/agronholm/anyio/compare/4.14.1...4.14.2">compare
view</a></li>
</ul>
</details>
<br />

---------

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: John Kennedy <65985482+jkennedyvz@users.noreply.github.com>
Co-authored-by: open-swe[bot] <open-swe@users.noreply.github.com>

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -8,6 +8,8 @@ body:
       value: |
         Thank you for taking the time to file a bug report.
 
+        > **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
+
         For usage questions, feature requests and general design questions, please use the [LangChain Forum](https://forum.langchain.com/).
 
         Check these before submitting to see if your issue has already been reported, fixed or if there's another way to solve your problem:
@@ -37,6 +39,16 @@ body:
           required: true
         - label: I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.
           required: true
+  - type: textarea
+    id: related
+    validations:
+      required: false
+    attributes:
+      label: Related Issues / PRs
+      description: |
+        If this bug is related to any existing issues or pull requests, please link them here.
+      placeholder: |
+        * e.g. #123, #456
   - type: textarea
     id: reproduction
     validations:

.github/ISSUE_TEMPLATE/config.yml

@@ -2,13 +2,13 @@ blank_issues_enabled: false
 version: 2.1
 contact_links:
   - name: 💬 LangChain Forum
-    url:  https://forum.langchain.com/
+    url: https://forum.langchain.com/
     about: General community discussions and support
   - name: 📚 LangGraph Documentation
     url: https://docs.langchain.com/oss/python/langgraph/overview
     about: View the official LangGraph documentation
   - name: 📚 API Reference Documentation
-    url: https://reference.langchain.com/python/
+    url: https://reference.langchain.com/python/langgraph/
     about: View the official LangGraph API reference documentation
   - name: 📚 Documentation issue
     url: https://github.com/langchain-ai/docs/issues/new?template=02-langgraph.yml

.github/ISSUE_TEMPLATE/privileged.yml

@@ -1,22 +1,21 @@
-name: 🔒 Privileged
-description: You are a LangGraph maintainer, or was asked directly by a maintainer to create an issue here. If not, check the other options.
+name: "\U0001F512 Privileged"
+description: You are a LangGraph maintainer. If not, check the other options.
 body:
   - type: markdown
     attributes:
       value: |
-        Thanks for your interest in LangGraph! 🚀
+        > **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
 
-        If you are not a LangGraph maintainer or were not asked directly by a maintainer to create an issue, then please start the conversation on the [LangChain Forum](https://forum.langchain.com/) instead.
+        If you are not a LangGraph maintainer, employee, or were not asked directly by a maintainer to create an issue, then please start the conversation on the [LangChain Forum](https://forum.langchain.com/) instead.
 
-        You are a LangGraph maintainer if you maintain any of the packages inside of the LangGraph repository 
-        or are a regular contributor to LangGraph with previous merged merged pull requests.
+        **Note:** Do not begin work on a PR unless explicitly assigned to this issue by a maintainer.
   - type: checkboxes
     id: privileged
     attributes:
       label: Privileged issue
       description: Confirm that you are allowed to create an issue here.
       options:
-        - label: I am a LangGraph maintainer, or was asked directly by a LangGraph maintainer to create an issue here.
+        - label: I am a LangGraph maintainer.
           required: true
   - type: textarea
     id: content
@@ -26,4 +25,4 @@ body:
   - type: markdown
     attributes:
       value: |
-        Community members should **NOT** work on Privileged issues unless these issues have been explicitly marked with a "help-wanted" tag.
+        Please do not begin work on a PR unless explicitly assigned to this issue by a maintainer.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,31 +1,40 @@
-Thank you for contributing to LangGraph! Follow these steps to mark your pull request as ready for review. **If any of these steps are not completed, your PR will not be considered for review.**
+Fixes #
 
-- [ ] **PR title**: Follows the format: {TYPE}({SCOPE}): {DESCRIPTION}
-  - Examples:
-    - feat(core): add multi-tenant support
-    - fix(cli): resolve flag parsing error
-    - docs(openai): update API usage examples
-  - Allowed `{TYPE}` values:
-    - feat, fix, docs, style, refactor, perf, test, build, ci, chore, revert, release
-  - Allowed `{SCOPE}` values (optional):
-    - langgraph, docs, cli, checkpoint, checkpoint-postgres, checkpoint-sqlite, prebuilt, scheduler-kafka, sdk-py
-  - Once you've written the title, please delete this checklist item; do not include it in the PR.
+<!-- Replace everything above this line with a 1-2 sentence description of your change. Keep the "Fixes #xx" keyword and update the issue number. -->
 
-- [ ] **PR message**: ***Delete this entire checklist*** and replace with
-  - **Description:** a description of the change. Include a [closing keyword](https://docs.github.com/en/issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue#linking-a-pull-request-to-an-issue-using-a-keyword) if applicable.
-  - **Issue:** the issue # it fixes, if applicable
-  - **Dependencies:** any dependencies required for this change
-  - **Twitter handle:** if your PR gets announced, and you'd like a mention, we'll gladly shout you out!
+Read the full contributing guidelines: https://docs.langchain.com/oss/python/contributing/overview
 
-- [ ] **Add tests and docs**: If you're adding a new integration, you must include:
-  1. A test for the integration, preferably unit tests that do not rely on network access,
-  2. An example notebook showing its use. It lives in `docs/docs/integrations` directory.
+> **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
 
-- [ ] **Lint and test**: Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified. We will not consider a PR unless these three are passing in CI. See [contribution guidelines](https://docs.langchain.com/oss/python/contributing/overview) for more.
+If you paste a large clearly AI generated description here your PR may be IGNORED or CLOSED!
+
+Thank you for contributing to LangGraph! Follow these steps to have your pull request considered as ready for review.
+
+1. PR title: Should follow the format: TYPE(SCOPE): DESCRIPTION
+
+    - feat(langgraph): add multi-tenant support
+  - Allowed TYPE and SCOPE values: https://github.com/langchain-ai/langgraph/blob/main/.github/workflows/pr_lint.yml#L19-L43
+
+2. PR description:
+
+  - Write 1-2 sentences summarizing the change.
+  - The `Fixes #xx` line at the top is **required** for external contributions — update the issue number and keep the keyword. This links your PR to the approved issue and auto-closes it on merge.
+  - If there are any breaking changes, please clearly describe them.
+  - If this PR depends on another PR being merged first, please include "Depends on #PR_NUMBER" in the description.
+
+3. Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified.
+
+  - We will not consider a PR unless these three are passing in CI.
+
+4. How did you verify your code works?
 
 Additional guidelines:
 
-- Make sure optional dependencies are imported within a function.
-- Please do not add dependencies to `pyproject.toml` files (even optional ones) unless they are **required** for unit tests.
-- Most PRs should not touch more than one package.
-- Changes should be backwards compatible.
+  - All external PRs must link to an issue or discussion where a solution has been approved by a maintainer, and you must be assigned to that issue. PRs without prior approval will be closed.
+  - PRs should not touch more than one package unless absolutely necessary.
+  - Do not update the `uv.lock` files or add dependencies to `pyproject.toml` files (even optional ones) unless you have explicit permission to do so by a maintainer.
+
+## Social handles (optional)
+<!-- If you'd like a shoutout on release, add your socials below -->
+Twitter: @
+LinkedIn: https://linkedin.com/in/

.github/THREAT_MODEL.md

@@ -0,0 +1,479 @@
+# Threat Model: LangGraph
+
+> Generated: 2026-03-28 | Commit: 0ba22143 | Scope: Full monorepo (all libs/)
+
+> **Disclaimer:** This threat model is automatically generated to help developers and security researchers understand where trust is placed in this system and where boundaries exist. It is experimental, subject to change, and not an authoritative security reference — findings should be validated before acting on them. The analysis may be incomplete or contain inaccuracies. We welcome suggestions and corrections to improve this document.
+
+For vulnerability reporting, see the [GitHub Security Advisories](https://github.com/langchain-ai/langgraph/security/advisories) page.
+
+## Scope
+
+### In Scope
+
+- `libs/langgraph` — Core graph execution engine (Pregel, StateGraph, channels, functional API with `@entrypoint`/`@task`)
+- `libs/prebuilt` — High-level agent APIs (ToolNode, create_react_agent, ValidationNode, InjectedState/InjectedStore/ToolRuntime injection)
+- `libs/checkpoint` — Checkpoint serialization/deserialization (JsonPlusSerializer, EncryptedSerializer, BaseCache, stores, serde event hooks, SAFE_MSGPACK_TYPES allowlist)
+- `libs/checkpoint-postgres` — PostgreSQL checkpoint saver, key-value store, and vector search
+- `libs/checkpoint-sqlite` — SQLite checkpoint saver, key-value store, and vector search
+- `libs/cli` — CLI for Docker-based deployment (`langgraph up/build/dev/new`), WebhookUrlPolicy
+- `libs/sdk-py` — Python SDK client for LangGraph Server API (HttpClient, Auth system, Encryption handlers)
+
+### Out of Scope
+
+- `libs/sdk-js` — Moved to external `langchain-ai/langgraphjs` repository; no source in this repo
+- `libs/checkpoint-conformance` — Conformance test suite only; not shipped code
+- LangGraph Server / `langgraph-api` — Closed-source server runtime; not in this repo
+- LangChain Core (`langchain-core`) — Upstream dependency; separate threat model
+- User application code — Tools, prompts, model selection, deployment infrastructure
+- LLM provider behavior — Model output content and safety
+- LangSmith platform — Observability/tracing backend
+- Tests, benchmarks, documentation — Not shipped code
+
+### Assumptions
+
+1. The project is used as a library/framework — users control their own application code, model selection, and deployment.
+2. Checkpoint storage backends (databases) are deployed with proper access controls by the user.
+3. LLM providers return well-formed responses per their documented API contracts.
+4. The `langgraph.json` configuration file is developer-controlled and not user-supplied at runtime.
+5. The CLI runs in a developer environment with Docker access.
+6. The SDK connects to trusted LangGraph Server endpoints chosen by the user.
+7. SDK Encryption handlers are developer-authored server-side code with application-level trust.
+
+---
+
+## System Overview
+
+LangGraph is an open-source Python framework for building stateful, multi-actor AI agent applications. It provides a graph-based execution model (Bulk Synchronous Parallel via the Pregel engine) where user-defined nodes process shared state through typed channels. The framework supports two authoring APIs: the declarative StateGraph API and the functional API (`@entrypoint`/`@task` decorators). It includes checkpointing (persistence of graph state to databases), tool execution (dispatching LLM-generated tool calls with runtime injection of state/store/context), remote graph composition (calling LangGraph Server APIs), Docker-based deployment via a CLI, and a beta SDK encryption framework for custom at-rest encryption handlers.
+
+### Architecture Diagram
+
+```
++---------------------------------------------------------------------------+
+|                        User Application                                    |
+|                                                                            |
+|  +-----------------------------------------------+                        |
+|  |  User Application Code                         |                       |
+|  |  (graph nodes, tools; StateGraph builder API   |                       |
+|  |   and functional API @entrypoint/@task both    |                       |
+|  |   compile to the same Pregel execution engine) |                       |
+|  +------------------------+----------------------+                        |
+|                           |                                                |
+|              +------------v-----------+                                   |
+|              |  StateGraph / Pregel    |                                   |
+|              |  (core execution engine)|                                   |
+|              +------+----------+------+                                   |
+|                     |          |                                           |
+|              InjectedState  +--v---------+                                |
+|              InjectedStore  |  ToolNode  |                                |
+|              ToolRuntime    |  (opt-in)  |                                |
+|                             +------------+                                |
+|                       |                                                    |
+| - - - - - - - - - - - | - - - - TB1: User/Framework API - - - - - - - -  |
+|                       |                                                    |
+|                 +-----v------+   +--------------+                         |
+|                 | Checkpoint |   | RemoteGraph   |                         |
+|                 | Serializer |   | (SDK client)  |                         |
+|                 |(jsonplus)  |   +------+--------+                         |
+|                 +-----+------+          |                                  |
+|                       |                 |                                   |
+| - - - - - - - - - - - | - - - - - - - -|- - TB2: Storage/Network - - - -  |
+|                       v                 v                                   |
+|               +--------------+  +--------------+                          |
+|               |  PostgreSQL  |  |  LangGraph   |                          |
+|               |  / SQLite    |  |  Server API  |                          |
+|               +--------------+  +--------------+                          |
+|                                                                            |
+|  +----------+                   +--------------+                          |
+|  |   CLI    |------------------>|   Docker     |                          |
+|  |(langgraph|   TB4: Config    |   Engine     |                          |
+|  | up/build)|                   +--------------+                          |
+|  +----------+                                                             |
+|                                                                            |
+|  +--------------------+                                                   |
+|  | SDK Encryption     |  TB5: Developer-authored handlers                 |
+|  | Handlers (beta)    |  (server-side execution in langgraph-api)         |
+|  +--------------------+                                                   |
++---------------------------------------------------------------------------+
+```
+
+---
+
+## Components
+
+| ID | Component | Description | Trust Level | Default? | Entry Points |
+|----|-----------|-------------|-------------|----------|--------------|
+| C1 | StateGraph / Pregel | Core graph builder and execution engine with v1/v2 output, durability modes (sync/async/exit), interrupt_before/interrupt_after | framework-controlled | Yes | `StateGraph.add_node()`, `StateGraph.compile()`, `Pregel.invoke()`, `Pregel.stream()` |
+| C2 | JsonPlusSerializer | Checkpoint serialization/deserialization with msgpack, JSON, and pickle codecs; 47-entry SAFE_MSGPACK_TYPES allowlist | framework-controlled | Yes | `loads_typed()`, `dumps_typed()`, `_create_msgpack_ext_hook()`, `_reviver()` |
+| C3 | ToolNode | Dispatches LLM-generated tool calls to registered BaseTool instances; supports InjectedState/InjectedStore/ToolRuntime injection into tools | framework-controlled | No (explicit opt-in required) | `ToolNode._func()`, `_run_one()`, `_execute_tool_sync()`, `_validate_tool_call()`, `_inject_tool_args()` |
+| C4 | RemoteGraph | Client for remote LangGraph Server API; implements PregelProtocol | framework-controlled | No (opt-in) | `RemoteGraph.stream()`, `RemoteGraph.invoke()`, `RemoteGraph.get_state()` |
+| C5 | PostgresSaver / PostgresStore | PostgreSQL checkpoint saver, key-value store, and vector search | framework-controlled | No (opt-in) | `from_conn_string()`, `put()`, `get_tuple()`, `search()` |
+| C6 | SqliteSaver / SqliteStore | SQLite checkpoint saver, key-value store with JSON path filtering | framework-controlled | No (opt-in) | `from_conn_string()`, `put()`, `get_tuple()`, `search()` |
+| C7 | EncryptedSerializer | AES-EAX authenticated encryption wrapper for checkpoint data | framework-controlled | No (opt-in) | `from_pycryptodome_aes()`, `loads_typed()`, `dumps_typed()` |
+| C8 | CLI (langgraph_cli) | Docker-based build and deployment tooling; config schema includes WebhookUrlPolicy for SSRF protection | framework-controlled | No (separate install) | `langgraph up`, `langgraph build`, `langgraph dev`, `langgraph new` |
+| C9 | SDK Client (langgraph_sdk) | HTTP client for LangGraph Server API with SSE streaming and reconnection | framework-controlled | Yes | `get_client()`, `get_sync_client()`, `HttpClient.request_reconnect()`, `HttpClient.stream()` |
+| C10 | User-Registered Tools | BaseTool instances provided by users; may use InjectedState/InjectedStore/ToolRuntime annotations | user-controlled | N/A | Tool `invoke()` / `ainvoke()` methods |
+| C11 | User-Registered Nodes | Arbitrary callables added via `add_node()` or `@task`/`@entrypoint` | user-controlled | N/A | Node function signatures |
+| C12 | Checkpoint Storage | PostgreSQL or SQLite databases storing serialized graph state | external | N/A | Database connection interface |
+| C13 | Functional API | `@entrypoint`/`@task` decorators for function-based workflow authoring with retry/cache policies | framework-controlled | Yes | `entrypoint.__call__()`, `task()`, `_TaskFunction.__call__()` (`libs/langgraph/langgraph/func/__init__.py`) |
+| C14 | BaseCache | Cache layer for task results with JsonPlusSerializer (pickle_fallback=False) | framework-controlled | No (opt-in, requires checkpointer) | `get()`, `set()`, `clear()` (`libs/checkpoint/langgraph/cache/base/__init__.py`) |
+| C15 | Serde Event Hooks | Monitoring system for serialization/deserialization events (msgpack_blocked, msgpack_unregistered_allowed, msgpack_method_blocked) | framework-controlled | Yes | `register_serde_event_listener()`, `emit_serde_event()` (`libs/checkpoint/langgraph/checkpoint/serde/event_hooks.py`) |
+| C16 | Auth System (SDK) | Custom authentication/authorization handler framework | framework-controlled | No (opt-in) | `Auth.authenticate()`, `Auth.on()` handler registration (`libs/sdk-py/langgraph_sdk/auth/__init__.py`) |
+| C17 | SDK Encryption Handlers (beta) | Custom at-rest encryption/decryption framework; supports blob and JSON handlers with per-model/field context; server-side execution | framework-controlled | No (opt-in, beta) | `Encryption.encrypt.blob()`, `Encryption.encrypt.json()`, `Encryption.decrypt.blob()`, `Encryption.decrypt.json()`, `Encryption.context()` (`libs/sdk-py/langgraph_sdk/encryption/__init__.py`) |
+
+---
+
+## Data Classification
+
+| ID | PII Category | Specific Fields | Sensitivity | Storage Location(s) | Encrypted at Rest | Retention | Regulatory |
+|----|-------------|----------------|-------------|---------------------|-------------------|-----------|------------|
+| DC1 | API credentials | `x-api-key` header, `LANGGRAPH_API_KEY`, `LANGSMITH_API_KEY`, `LANGCHAIN_API_KEY` env vars | Critical | Environment variables, HTTP headers in transit | N/A (in-memory) | Session lifetime | All — breach trigger |
+| DC2 | Encryption keys | `LANGGRAPH_AES_KEY` env var, `key` parameter to `from_pycryptodome_aes()` | Critical | Environment variable, in-memory | N/A | Application lifetime | All — breach trigger |
+| DC3 | Serialized graph state | Checkpoint data in `checkpoints` and `writes` tables (msgpack/JSON/pickle bytes) | High | PostgreSQL (BYTEA), SQLite (BLOB) | Optional via EncryptedSerializer or SDK Encryption Handlers | Unbounded (no default TTL) | GDPR if state contains PII |
+| DC4 | Store key-value data | User-stored items in `store` tables via BaseStore | High | PostgreSQL, SQLite | No (plaintext JSON); optional via SDK Encryption Handlers | Configurable TTL, default unbounded | GDPR if contains PII |
+| DC5 | Checkpoint metadata | `thread_id`, `checkpoint_ns`, `run_id`, `step`, `source` | Medium | PostgreSQL, SQLite (metadata JSONB/JSON column) | No | Same as DC3 | Minimal |
+| DC6 | Agent conversation history | LangChain messages (HumanMessage, AIMessage, ToolMessage) serialized in checkpoint state | High | PostgreSQL, SQLite (within DC3 checkpoint bytes) | Only if DC3 encrypted | Unbounded | GDPR, CCPA if contains user PII |
+| DC7 | Connection strings | PostgreSQL URIs, SQLite file paths passed to `from_conn_string()` | Critical | Application code, environment variables | N/A (in-memory) | Application lifetime | All — may contain credentials |
+| DC8 | Vector embeddings | Document embeddings in `store_vectors` table | Low | PostgreSQL (pgvector), SQLite (vec extension) | No | Same as DC4 | Minimal |
+| DC9 | SDK Encryption context metadata | `EncryptionContext.metadata` dict passed to encryption handlers | Medium | In-memory per request; persisted with encrypted data | N/A (context, not payload) | Request lifetime + persistence alongside encrypted data | Depends on content |
+
+### Data Classification Details
+
+#### DC1: API Credentials
+
+- **Fields**: `x-api-key` HTTP header, `LANGGRAPH_API_KEY`/`LANGSMITH_API_KEY`/`LANGCHAIN_API_KEY` environment variables
+- **Storage**: Environment variables (loaded at runtime), HTTP request headers (in transit)
+- **Access**: SDK client code (`libs/sdk-py/langgraph_sdk/_shared/utilities.py:_get_api_key`), any process with env var access
+- **Encryption**: TLS in transit (if HTTPS); no at-rest encryption for env vars
+- **Retention**: Session/process lifetime
+- **Logging exposure**: API key stripped of quotes but could appear in debug logs if HTTP headers are logged. `RESERVED_HEADERS` prevents user override of `x-api-key` but doesn't prevent logging.
+- **Cross-border**: Travels with every HTTP request to the LangGraph Server
+- **Gaps**: SDK `request_reconnect()` and `stream()` forward `x-api-key` header to server-controlled `Location` redirect URLs without URL validation (see T9)
+
+#### DC2: Encryption Keys
+
+- **Fields**: `LANGGRAPH_AES_KEY` environment variable, `key` bytes parameter
+- **Storage**: Environment variable or direct bytes in application code
+- **Access**: `libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:from_pycryptodome_aes`
+- **Encryption**: N/A — this IS the encryption key
+- **Retention**: Application lifetime
+- **Logging exposure**: Not logged by framework code
+- **Gaps**: Key loaded from env var as UTF-8 string limits entropy to ~6.57 bits/byte (see T7). Cipher name validated with `assert` which is stripped by `python -O` (see T8).
+
+#### DC3: Serialized Graph State
+
+- **Fields**: All channel values serialized via `JsonPlusSerializer.dumps_typed()` — includes complete agent state, conversation history, tool call results, and any user-defined state
+- **Storage**: PostgreSQL `checkpoints.checkpoint` (BYTEA), `writes.blob` (BYTEA); SQLite `checkpoints.checkpoint` (BLOB), `writes.blob` (BLOB)
+- **Access**: Any code with database credentials; `BaseCheckpointSaver.get_tuple()` / `put()`
+- **Encryption**: Optional via `EncryptedSerializer` wrapping (AES-EAX) or SDK Encryption Handlers (beta, server-side). Not encrypted by default.
+- **Retention**: Unbounded by default. Optional TTL via `CheckpointerConfig.ttl` (server-side config)
+- **Logging exposure**: Serde event hooks emit module/class names of deserialized types but not the data itself
+- **Gaps**: Default unbounded retention of potentially PII-containing state. Unencrypted by default. EncryptedSerializer has fallback that accepts unencrypted data (see T10).
+
+#### DC6: Agent Conversation History
+
+- **Fields**: `HumanMessage.content`, `AIMessage.content`, `ToolMessage.content`, `AIMessage.tool_calls` — embedded within DC3 checkpoint bytes
+- **Storage**: Same as DC3 (within serialized checkpoint data)
+- **Access**: Same as DC3
+- **Encryption**: Only if DC3 is encrypted via EncryptedSerializer or SDK Encryption Handlers
+- **Retention**: Same as DC3 (unbounded default)
+- **Gaps**: Conversation content may include user PII, PHI, or sensitive business data. No field-level encryption or redaction. Retention inherits from DC3 with no conversation-specific policy.
+
+#### DC9: SDK Encryption Context Metadata
+
+- **Fields**: `EncryptionContext.model` (str), `EncryptionContext.field` (str), `EncryptionContext.metadata` (dict)
+- **Storage**: In-memory during request processing; persisted alongside encrypted data for later decryption
+- **Access**: Encryption/decryption handlers (developer-authored), ContextHandler (receives authenticated BaseUser)
+- **Encryption**: N/A — this is context for encryption, not encrypted data itself
+- **Retention**: Persisted with encrypted data indefinitely
+- **Logging exposure**: Not logged by SDK code
+- **Gaps**: `metadata` is a mutable dict — whether cross-request isolation is enforced depends on server-side implementation (langgraph-api, out of scope). ContextHandler registration at `libs/sdk-py/langgraph_sdk/encryption/__init__.py:Encryption.context` does not call `_validate_handler` (missing async/param-count validation, unlike all other handler types).
+
+---
+
+## Trust Boundaries
+
+| ID | Boundary | Description | Controls (Inside) | Does NOT Control (Outside) |
+|----|----------|-------------|-------------------|---------------------------|
+| TB1 | User/Framework API | Where user-provided code and configuration enters the framework | Graph execution logic, channel semantics, default configs, validation of graph structure, tool injection merge order (system values overwrite LLM values) | User node implementations, tool behavior, model selection, prompt construction, state schema design |
+| TB2 | Checkpoint Storage | Where serialized data enters/leaves the persistence layer | Serialization format, allowlists for deserialization (47 safe types, 1 safe method), encryption (if configured), serde event hooks | Database access controls, who can write to the checkpoint tables, storage infrastructure security |
+| TB3 | Remote API | Where data crosses the network to/from LangGraph Server | Outbound config sanitization (`_sanitize_config`), SDK HTTP transport, API key handling, `RESERVED_HEADERS` | Remote server behavior, response content integrity, network security (TLS), server-provided Location redirect targets |
+| TB4 | CLI Config/Docker | Where developer config drives container image generation | Dockerfile template structure, config schema validation (including WebhookUrlPolicy), list-based subprocess args, build command content validation | `langgraph.json` file content, Docker daemon security, host filesystem |
+| TB5 | SDK Encryption Handlers | Where developer-authored encryption handlers process sensitive data | Handler signature validation (async, 2-param for encrypt/decrypt), duplicate registration prevention, EncryptionContext construction | Handler implementation correctness, key management, actual encrypt/decrypt behavior, server-side execution environment |
+
+### Boundary Details
+
+#### TB1: User/Framework API
+
+- **Inside**: Graph compilation validates structure (`libs/langgraph/langgraph/pregel/_validate.py:validate_graph`). Channel types enforce update semantics (`libs/langgraph/langgraph/channels/base.py:BaseChannel.update`). Functional API validates entrypoint has at least one parameter (`libs/langgraph/langgraph/func/__init__.py:entrypoint`). Sensitive config keys filtered from metadata propagation — keys containing "key", "token", "secret", "password", "auth" are excluded (`libs/langgraph/langgraph/_internal/_config.py:_exclude_as_metadata`). Tool injection merge order ensures system-injected values (InjectedState/InjectedStore/ToolRuntime) overwrite any LLM-supplied collisions (`libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._inject_tool_args` line 1380). Injected parameter names hidden from LLM tool schema via `tool_call_schema` filtering.
+- **Outside**: What user nodes do, what tools return, what LLMs generate, how users handle output.
+- **Crossing mechanism**: Python function calls — `add_node(callable)`, `add_edge()`, `compile(checkpointer=...)`, `@entrypoint`, `@task`.
+
+#### TB2: Checkpoint Storage
+
+- **Inside**: `JsonPlusSerializer` controls serialization format (`libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:JsonPlusSerializer`). Msgpack type allowlist (`libs/checkpoint/langgraph/checkpoint/serde/_msgpack.py:SAFE_MSGPACK_TYPES` — 47 safe types including stdlib, langchain_core messages, and langgraph types). Msgpack method allowlist (`libs/checkpoint/langgraph/checkpoint/serde/_msgpack.py:SAFE_MSGPACK_METHODS` — 1 safe method: `datetime.datetime.fromisoformat`). JSON module allowlist (`libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:_check_allowed_json_modules`). Serde event hooks for monitoring (`libs/checkpoint/langgraph/checkpoint/serde/event_hooks.py:emit_serde_event`). Optional `EncryptedSerializer` wrapping (`libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:EncryptedSerializer`). SQLite filter key regex validation (`libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/utils.py:_validate_filter_key`). Parameterized SQL queries in both Postgres and SQLite backends.
+- **Outside**: Database access controls, who can read/write checkpoint tables, storage backend integrity.
+- **Crossing mechanism**: Database read/write operations — serialized bytes stored as BYTEA (Postgres) or BLOB (SQLite).
+
+#### TB3: Remote API
+
+- **Inside**: `_sanitize_config()` strips non-primitive values and drops checkpoint-internal keys from outbound config (`libs/langgraph/langgraph/pregel/remote.py:_sanitize_config`). SDK handles API key from env vars (`libs/sdk-py/langgraph_sdk/_shared/utilities.py:_get_api_key`). `RESERVED_HEADERS` prevents user override of `x-api-key` (`libs/sdk-py/langgraph_sdk/_shared/utilities.py:RESERVED_HEADERS`).
+- **Outside**: Remote server response content, network integrity, whether the server is legitimate, server-provided Location redirect targets.
+- **Crossing mechanism**: HTTPS requests via `httpx` through `langgraph_sdk`.
+
+#### TB4: CLI Config/Docker
+
+- **Inside**: Config file parsed as JSON (`libs/cli/langgraph_cli/config.py:validate_config_file`). Docker subprocess invoked with list-based args via `asyncio.create_subprocess_exec`, not `shell=True` (`libs/cli/langgraph_cli/exec.py:subp_exec`). Template downloads from hardcoded GitHub URLs (`libs/cli/langgraph_cli/templates.py`). Config schema validation covers store, auth, encryption, http, webhooks, checkpointer, and ui sections (`libs/cli/langgraph_cli/schemas.py`). Build command content validation blocks shell metacharacters (`libs/cli/langgraph_cli/config.py:has_disallowed_build_command_content`). WebhookUrlPolicy (`libs/cli/langgraph_cli/schemas.py:WebhookUrlPolicy`) supports `require_https`, `allowed_domains`, `allowed_ports`, `max_url_length`, `disable_loopback` for SSRF protection.
+- **Outside**: Content of `langgraph.json`, Docker daemon behavior, filesystem permissions.
+- **Crossing mechanism**: JSON file read, subprocess execution, ZIP download/extraction.
+
+#### TB5: SDK Encryption Handlers
+
+- **Inside**: Handler signature validation — must be async, must accept exactly 2 positional params (`libs/sdk-py/langgraph_sdk/encryption/__init__.py:_validate_handler`). Duplicate handler registration prevention (`DuplicateHandlerError`). `EncryptionContext` construction with model/field/metadata (`libs/sdk-py/langgraph_sdk/encryption/types.py:EncryptionContext`). JSON key preservation constraint documented (enforced server-side).
+- **Outside**: Handler implementation correctness, key management strategy, actual encryption/decryption logic, server-side execution in langgraph-api.
+- **Crossing mechanism**: Python decorator registration at import time; server-side invocation at runtime.
+
+---
+
+## Data Flows
+
+| ID | Source | Destination | Data Type | Classification | Crosses Boundary | Protocol |
+|----|--------|-------------|-----------|----------------|------------------|----------|
+| DF1 | C12 (Checkpoint Storage) | C2 (JsonPlusSerializer) | Serialized checkpoint bytes (msgpack/JSON/pickle) | DC3 | TB2 | Database read |
+| DF2 | C2 (JsonPlusSerializer) | C1 (Pregel) | Deserialized Python objects (channel state) | DC3, DC6 | TB2 | Function call |
+| DF3 | LLM (external) | C3 (ToolNode) | Tool call arguments (JSON strings in AIMessage) | — | TB1 | Function call (via langchain-core) |
+| DF4 | C3 (ToolNode) | C10 (User Tools) | Parsed argument dicts merged with injected state/store/runtime | — | TB1 | `tool.invoke(call_args)` |
+| DF5 | C4 (RemoteGraph) | C1 (Pregel) | Stream chunks (JSON-deserialized dicts) | — | TB3 | HTTPS / SSE |
+| DF6 | `langgraph.json` | C8 (CLI) | Config dict (graphs, env, store, auth, encryption, http, webhooks, checkpointer, ui) | — | TB4 | `json.load()` |
+| DF7 | C8 (CLI) | Docker | Dockerfile content with embedded ENV values | — | TB4 | `asyncio.create_subprocess_exec` |
+| DF8 | C11 (User Nodes) | C1 (Pregel) | State updates (arbitrary Python objects) | — | TB1 | Channel write |
+| DF9 | C9 (SDK Client) | C4 (RemoteGraph) | API responses (JSON) | — | TB3 | HTTPS |
+| DF10 | User config | C7 (EncryptedSerializer) | AES key from LANGGRAPH_AES_KEY env var | DC2 | TB2 | `os.getenv()` |
+| DF11 | C12 (Checkpoint Storage) | C14 (BaseCache) | Cached task results via JsonPlusSerializer | DC3 | TB2 | Database read |
+| DF12 | LangGraph Server | C9 (SDK Client) | HTTP responses with Location header | DC1 | TB3 | HTTP redirect |
+| DF13 | C9 (SDK Client) | Redirect target | Request headers including x-api-key | DC1 | TB3 | HTTPS |
+| DF14 | C1 (Pregel state) | C3 (ToolNode) | InjectedState/InjectedStore/ToolRuntime values for tool injection | DC3, DC4 | TB1 | Function call (dict merge) |
+| DF15 | Developer code | C17 (SDK Encryption Handlers) | Encryption/decryption handler functions and context handler | — | TB5 | Python decorator registration |
+
+### Flow Details
+
+#### DF1: Checkpoint Storage -> JsonPlusSerializer
+
+- **Data**: Serialized graph state as `(type_tag, bytes)` tuples. Type tags include `"msgpack"`, `"json"`, `"pickle"`, `"bytes"`, `"null"`. When encrypted: `"msgpack+aes"`, `"json+aes"`.
+- **Validation**: Type tag dispatches to codec. Msgpack: `_create_msgpack_ext_hook` with allowlist check — `SAFE_MSGPACK_TYPES` (47 entries) always checked first, then `allowed_modules` determines behavior for unregistered types (`libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:_create_msgpack_ext_hook`). JSON: `_reviver` with `lc:2` module allowlist. Pickle: **no restrictions** (`pickle.loads(data_)` if `pickle_fallback=True`, `libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:JsonPlusSerializer.loads_typed`). The proposed `secure_pickle.py` with `RestrictedUnpickler` was documented in `SECURITY_FIX_SUMMARY.md` but never merged.
+- **Trust assumption**: Checkpoint storage is access-controlled. An attacker with write access to the database can craft malicious checkpoint data.
+
+#### DF3: LLM -> ToolNode
+
+- **Data**: Tool call name and arguments from LLM-generated `AIMessage.tool_calls`.
+- **Validation**: Tool name checked against registered `tools_by_name` dict — unknown names return error `ToolMessage` (`libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._validate_tool_call`). Argument values validated only by the target tool's Pydantic schema.
+- **Trust assumption**: LLM output is treated as untrusted for tool name routing but argument values pass through to tools without ToolNode-level sanitization.
+
+#### DF4: ToolNode -> User Tools (with Injection)
+
+- **Data**: Parsed argument dicts from LLM, merged with system-injected InjectedState/InjectedStore/ToolRuntime values.
+- **Validation**: Four-layer defense: (1) Injected parameter names hidden from LLM via `tool_call_schema` filtering. (2) Dict merge `{**llm_args, **injected_args}` places system values last — system always wins on collision (`libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._inject_tool_args` line 1380). (3) Pydantic `model_validate` with default `extra="ignore"` drops unknown keys. (4) Output construction only includes declared model fields.
+- **Trust assumption**: LLM-provided arguments cannot override system-injected values due to merge order.
+
+#### DF5: RemoteGraph -> Pregel
+
+- **Data**: Stream event chunks containing dicts for `Interrupt`, `Command`, state snapshots.
+- **Validation**: **None** on inbound data. `Interrupt(**i)` uses dict-splatting with no schema check (`libs/langgraph/langgraph/pregel/remote.py:RemoteGraph.stream`). `Command(**chunk.data)` uses dict-splatting for parent commands.
+- **Trust assumption**: Remote server is trusted. A compromised or malicious server can inject arbitrary field values.
+
+#### DF6: langgraph.json -> CLI
+
+- **Data**: JSON config including `graphs`, `env`, `store`, `auth`, `encryption`, `http`, `webhooks`, `checkpointer`, `ui`, `ui_config` sections.
+- **Validation**: Schema validation in `validate_config_file()` (`libs/cli/langgraph_cli/config.py:validate_config_file`). Config values embedded in Dockerfile via `json.dumps()` in single-quoted `ENV` lines (`libs/cli/langgraph_cli/config.py:python_config_to_docker`). Build command content validation (`libs/cli/langgraph_cli/config.py:has_disallowed_build_command_content`) blocks shell metacharacters.
+- **Trust assumption**: `langgraph.json` is developer-authored. Single quotes in config values could break Dockerfile `ENV` syntax.
+
+#### DF11: Checkpoint Storage -> BaseCache
+
+- **Data**: Cached task results stored via `BaseCache.set()` and retrieved via `BaseCache.get()`.
+- **Validation**: Uses `JsonPlusSerializer(pickle_fallback=False)` by default (`libs/checkpoint/langgraph/cache/base/__init__.py:BaseCache`). Subject to same msgpack deserialization behavior as DF1 (allowed_modules defaults based on `LANGGRAPH_STRICT_MSGPACK`).
+- **Trust assumption**: Cache storage has same access controls as checkpoint storage.
+
+#### DF12-13: Server -> SDK -> Redirect Target (API Key Leak)
+
+- **Data**: Server provides `Location` header in HTTP response. SDK follows the redirect and sends all original request headers (including `x-api-key`) to the target URL.
+- **Validation**: **None** on Location URL. No allowlist, no same-origin check, no header stripping on cross-origin redirect.
+- **Trust assumption**: The LangGraph Server is trusted to not redirect to malicious URLs. Violated if server is compromised.
+
+#### DF14: Pregel State -> ToolNode (Runtime Injection)
+
+- **Data**: Graph state dict (InjectedState), BaseStore instance (InjectedStore), ToolRuntime object (containing state, config, store, context, stream_writer, tool_call_id).
+- **Validation**: Injection targets determined by tool type annotations at compile time. Injected values overwrite any LLM-provided values with matching keys (safe merge order). Pydantic validation on tool input drops extra keys not in the tool's declared schema.
+- **Trust assumption**: System-injected values are trusted; LLM-provided values cannot interfere due to merge order guarantees.
+
+#### DF15: Developer Code -> SDK Encryption Handlers
+
+- **Data**: Async Python callables registered via decorators for blob/JSON encryption/decryption and context derivation.
+- **Validation**: `_validate_handler` checks async-ness and 2-param signature for encrypt/decrypt handlers. `DuplicateHandlerError` prevents double registration. **Gap**: `Encryption.context()` method does NOT call `_validate_handler` — a sync function or wrong param count passes registration and fails only at server-side invocation (`libs/sdk-py/langgraph_sdk/encryption/__init__.py:Encryption.context`).
+- **Trust assumption**: Handler authors are application developers with server-level trust.
+
+---
+
+## Threats
+
+| ID | Data Flow | Classification | Threat | Boundary | Severity | Validation | Code Reference |
+|----|-----------|----------------|--------|----------|----------|------------|----------------|
+| T1 | DF1, DF11 | DC3 | Arbitrary code execution via msgpack deserialization when strict mode is OFF (default) | TB2 | High | Verified | `libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:_create_msgpack_ext_hook` |
+| T2 | DF1 | DC3 | Arbitrary code execution via `pickle.loads` when `pickle_fallback=True` | TB2 | High | Verified | `libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:JsonPlusSerializer.loads_typed` |
+| T3 | DF1 | DC3 | Arbitrary module import/execution via JSON `lc:2` constructor when `allowed_json_modules=True` | TB2 | High | Verified | `libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:JsonPlusSerializer._revive_lc2` |
+| T4 | DF5 | — | Unvalidated dict-splatting from remote API into `Interrupt`/`Command` objects | TB3 | Medium | Likely | `libs/langgraph/langgraph/pregel/remote.py:RemoteGraph.stream` |
+| T5 | DF6, DF7 | — | Dockerfile ENV injection via single-quote in `langgraph.json` config values | TB4 | Low | Likely | `libs/cli/langgraph_cli/config.py:python_config_to_docker` |
+| T6 | DF7 | — | ZIP slip in `langgraph new` template extraction | TB4 | Low | Unverified | `libs/cli/langgraph_cli/templates.py:_download_repo_with_requests` |
+| T7 | DF10 | DC2 | AES key entropy limited to printable characters via env var string encoding | TB2 | Info | — | `libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:EncryptedSerializer.from_pycryptodome_aes` |
+| T8 | DF10 | DC2 | EncryptedSerializer cipher name check uses `assert` (stripped with `python -O`) | TB2 | Low | Verified | `libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:PycryptodomeAesCipher.decrypt` |
+| T9 | DF12, DF13 | DC1 | SDK API key leak via server-controlled Location redirect to attacker-controlled URL | TB3 | Medium | Verified | `libs/sdk-py/langgraph_sdk/_async/http.py:HttpClient.request_reconnect`, `libs/sdk-py/langgraph_sdk/_async/http.py:HttpClient.stream` |
+| T10 | DF1 | DC3 | EncryptedSerializer silently accepts unencrypted data — attacker bypasses encryption by writing plain type tags | TB2 | Medium | Verified | `libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:EncryptedSerializer.loads_typed` |
+| T11 | DF1, DF11 | DC3, DC6 | Unbounded retention of checkpoint data containing PII/conversation history | TB2 | Medium | — | `libs/checkpoint/langgraph/checkpoint/base/__init__.py:BaseCheckpointSaver` |
+
+### Threat Details
+
+#### T1: Msgpack Deserialization RCE (Default Config)
+
+- **Flow**: DF1 (Checkpoint Storage -> JsonPlusSerializer), DF11 (Checkpoint Storage -> BaseCache)
+- **Description**: When `LANGGRAPH_STRICT_MSGPACK` is not set (the default), the msgpack `_create_msgpack_ext_hook` allows **any** `(module, class)` pair stored in checkpoint data to be imported via `importlib.import_module` and instantiated with attacker-controlled arguments. The `SAFE_MSGPACK_TYPES` allowlist (47 entries) is checked first, but unregistered types are logged as warnings and allowed through when `allowed_modules=True` (the default when strict mode is off). Seven EXT codes are processed: `EXT_CONSTRUCTOR_SINGLE_ARG` (0), `EXT_CONSTRUCTOR_POS_ARGS` (1), `EXT_CONSTRUCTOR_KW_ARGS` (2), `EXT_METHOD_SINGLE_ARG` (3), `EXT_PYDANTIC_V1` (4), `EXT_PYDANTIC_V2` (5), `EXT_NUMPY_ARRAY` (6). The `BaseCache` component uses `JsonPlusSerializer(pickle_fallback=False)` but inherits the same msgpack `allowed_modules` default behavior. The proposed `RestrictedUnpickler` (`secure_pickle.py`) documented in `SECURITY_FIX_SUMMARY.md` was never merged — pickle remains unrestricted when enabled.
+- **Preconditions**: Attacker must have write access to the checkpoint database (PostgreSQL or SQLite). This requires compromised database credentials or a co-located attacker.
+
+#### T2: Pickle Deserialization RCE
+
+- **Flow**: DF1 (Checkpoint Storage -> JsonPlusSerializer)
+- **Description**: When `pickle_fallback=True` is explicitly passed to `JsonPlusSerializer`, checkpoint data with type tag `"pickle"` is deserialized via `pickle.loads()` with zero restrictions (`libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:JsonPlusSerializer.loads_typed`).
+- **Preconditions**: (1) Application or checkpointer explicitly enables `pickle_fallback=True`. (2) Attacker writes `("pickle", <payload>)` to checkpoint storage.
+
+#### T3: JSON lc:2 Constructor RCE
+
+- **Flow**: DF1 (Checkpoint Storage -> JsonPlusSerializer)
+- **Description**: The JSON `_reviver` handles `lc:2` type constructors by importing the module path from checkpoint JSON data via `importlib.import_module` (`libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:JsonPlusSerializer._revive_lc2`). If `allowed_json_modules=True` (explicit opt-in), any module reachable in the Python environment can be imported and instantiated. The method also supports method chaining — a `method` key in the JSON can call arbitrary methods on the imported class.
+- **Preconditions**: (1) `allowed_json_modules` set to `True` (not the default). (2) Attacker writes crafted JSON to checkpoint storage.
+
+#### T4: RemoteGraph Unvalidated Inbound Data
+
+- **Flow**: DF5 (RemoteGraph -> Pregel)
+- **Description**: Stream events from the remote LangGraph Server are deserialized from JSON and dict-splatted into `Interrupt(**i)` and `Command(**chunk.data)` without schema validation (`libs/langgraph/langgraph/pregel/remote.py:RemoteGraph.stream`). A compromised or malicious remote server can inject unexpected fields. `Command.update` can carry arbitrary state modifications; `Command.goto` can alter graph execution flow. `Interrupt` accepts `**deprecated_kwargs` which includes a `ns` parameter that can override interrupt ID generation via `xxh3_128_hexdigest`.
+- **Preconditions**: User connects `RemoteGraph` to a compromised or attacker-controlled server URL.
+
+#### T5: Dockerfile ENV Single-Quote Injection
+
+- **Flow**: DF6, DF7 (langgraph.json -> CLI -> Dockerfile)
+- **Description**: Config values from `langgraph.json` are serialized via `json.dumps()` and embedded in single-quoted `ENV` directives across multiple config sections (store, auth, encryption, http, webhooks, checkpointer, ui, ui_config, graphs). JSON does not escape single quotes, so a config value containing `'` could break the Dockerfile syntax or inject additional Dockerfile instructions. The pattern is duplicated in two Dockerfile generation functions (`libs/cli/langgraph_cli/config.py:python_config_to_docker` and `libs/cli/langgraph_cli/config.py:node_config_to_docker`).
+- **Preconditions**: A `langgraph.json` config value contains a single quote character.
+
+#### T6: ZIP Slip in Template Extraction
+
+- **Flow**: DF7 (CLI template download)
+- **Description**: `langgraph new` downloads a ZIP from GitHub and uses `zip_file.extractall(path)`. If the archive contains path-traversal entries (e.g., `../../etc/cron.d/exploit`), files could be written outside the target directory.
+- **Preconditions**: The GitHub-hosted template archive must contain malicious path entries. This requires compromise of the upstream template repo.
+
+#### T7: AES Key Entropy via Environment Variable
+
+- **Flow**: DF10 (User config -> EncryptedSerializer)
+- **Description**: The AES key is loaded from `LANGGRAPH_AES_KEY` as a UTF-8 string and `.encode()`d to bytes (`libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:EncryptedSerializer.from_pycryptodome_aes`). This limits key entropy to printable characters (~6.57 bits/byte vs. 8 bits/byte for random bytes), reducing effective key strength for AES-128 from 128 bits to ~105 bits.
+- **Preconditions**: User relies on environment variable path for key loading (vs. passing raw bytes directly via `key=` parameter).
+
+#### T8: EncryptedSerializer Assert Bypass
+
+- **Flow**: DF10 (Encrypted checkpoint data)
+- **Description**: The cipher name check in `decrypt()` uses `assert ciphername == "aes"` (`libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:PycryptodomeAesCipher.decrypt`), which is stripped when Python runs with `-O` (optimize) flag. The `ciphername` value comes from the type tag in checkpoint storage (split from the `type+cipher` format).
+- **Preconditions**: Python running with `-O` flag AND attacker can write to checkpoint storage.
+
+#### T9: SDK API Key Leak via Server-Controlled Location Redirect
+
+- **Flow**: DF12 (Server -> SDK), DF13 (SDK -> Redirect target)
+- **Description**: The SDK's `HttpClient.request_reconnect()` (`libs/sdk-py/langgraph_sdk/_async/http.py:HttpClient.request_reconnect`) follows server-provided `Location` headers and forwards the full `request_headers` dict (including the `x-api-key` authentication header) to the redirected URL. The `HttpClient.stream()` method (`libs/sdk-py/langgraph_sdk/_async/http.py:HttpClient.stream`) also follows `Location` headers for SSE reconnection and forwards `reconnect_headers` (which include `x-api-key`) to the server-controlled URL. No URL validation, same-origin check, or sensitive header stripping is performed before following the redirect. The same pattern exists in the sync client (`libs/sdk-py/langgraph_sdk/_sync/http.py`).
+- **Preconditions**: (1) User connects SDK to a LangGraph Server that is compromised or attacker-controlled. (2) The server returns a response with a `Location` header pointing to an attacker-controlled URL.
+
+#### T10: EncryptedSerializer Encryption Bypass via Unencrypted Data Injection
+
+- **Flow**: DF1 (Checkpoint Storage -> EncryptedSerializer)
+- **Description**: `EncryptedSerializer.loads_typed()` (`libs/checkpoint/langgraph/checkpoint/serde/encrypted.py:EncryptedSerializer.loads_typed`) checks if the type tag contains a `+` delimiter. If it does not (e.g., type tag is `"msgpack"` instead of `"msgpack+aes"`), the data is passed directly to the inner serde's `loads_typed()` **without any decryption or MAC verification**. An attacker with write access to checkpoint storage can bypass the encryption layer entirely by writing data with a plain type tag.
+- **Preconditions**: (1) Application uses `EncryptedSerializer` for checkpoint protection. (2) Attacker has write access to checkpoint storage.
+
+#### T11: Unbounded Checkpoint Data Retention
+
+- **Flow**: DF1, DF11 (Checkpoint Storage lifecycle)
+- **Description**: Checkpoint data (DC3, DC6) is retained indefinitely by default. No built-in TTL, pruning, or data lifecycle management in the library-level checkpoint savers. Conversation history containing user PII may accumulate without bounds.
+- **Preconditions**: Application uses checkpointing (the primary use case). No explicit cleanup configured.
+
+---
+
+## Input Source Coverage
+
+| Input Source | Data Flows | Threats | Validation Points | Responsibility | Gaps |
+|-------------|-----------|---------|-------------------|----------------|------|
+| User direct input (graph state, config) | DF8 | — | Graph structure validation (`libs/langgraph/langgraph/pregel/_validate.py:validate_graph`), channel type enforcement (`libs/langgraph/langgraph/channels/base.py:BaseChannel`), sensitive key filtering (`libs/langgraph/langgraph/_internal/_config.py:_exclude_as_metadata`) | User | Node implementation safety is user's responsibility |
+| LLM output (tool calls) | DF3, DF4, DF14 | — | Tool name allowlist (`libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._validate_tool_call`), tool Pydantic schemas, injection merge order (`libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._inject_tool_args`), `tool_call_schema` filtering of injected params | Shared (project validates name and injection safety; user validates args via tool schema) | No ToolNode-level argument sanitization beyond injection overwrite |
+| Checkpoint storage data | DF1, DF2, DF11 | T1, T2, T3, T10 | Msgpack allowlist (`libs/checkpoint/langgraph/checkpoint/serde/_msgpack.py:SAFE_MSGPACK_TYPES` — 47 entries), msgpack method allowlist (`libs/checkpoint/langgraph/checkpoint/serde/_msgpack.py:SAFE_MSGPACK_METHODS`), JSON allowlist (`libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py:_check_allowed_json_modules`), pickle gating, serde event hooks, optional encryption | Shared (project owns serializer defaults; user owns DB access controls) | Default msgpack mode allows unregistered types; EncryptedSerializer accepts unencrypted data; proposed secure_pickle.py never merged |
+| Remote API responses | DF5, DF9, DF12, DF13 | T4, T9 | Outbound config sanitization (`libs/langgraph/langgraph/pregel/remote.py:_sanitize_config`); no inbound validation; no redirect URL validation | User (user chooses which server to trust) | No inbound schema validation; API key forwarded on redirects |
+| Configuration (langgraph.json) | DF6, DF7 | T5 | JSON schema validation (`libs/cli/langgraph_cli/config.py:validate_config_file`), build command content validation (`libs/cli/langgraph_cli/config.py:has_disallowed_build_command_content`), list-based subprocess args, WebhookUrlPolicy (`libs/cli/langgraph_cli/schemas.py:WebhookUrlPolicy`) | User (developer-controlled file) | Single-quote not escaped in ENV embedding |
+| Configuration (env vars) | DF10 | T7, T8 | AES key length validation, EAX MAC verification | User (deployer controls env) | Key entropy, assert-based check |
+| Developer encryption handlers | DF15 | — | Handler signature validation (`libs/sdk-py/langgraph_sdk/encryption/__init__.py:_validate_handler`), duplicate prevention | User (developer-authored code) | `context()` handler missing `_validate_handler` call |
+
+---
+
+## Out-of-Scope Threats
+
+Threats that appear valid in isolation but fall outside project responsibility because they depend on conditions the project does not control.
+
+| Pattern | Why Out of Scope | Project Responsibility Ends At |
+|---------|-----------------|-------------------------------|
+| Prompt injection leading to arbitrary tool execution | Project does not control LLM model behavior, user prompt construction, or which tools are registered. ToolNode routes by name only to user-registered tools. | Providing tool name allowlist routing (`libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._validate_tool_call`); user owns tool registration and argument handling |
+| State poisoning via malicious node output | User-registered nodes (including `@task`-decorated functions) can write arbitrary values to channels. The framework executes nodes as provided. | Enforcing channel type contracts (`libs/langgraph/langgraph/channels/base.py:BaseChannel.update`); user owns node implementation correctness |
+| Cross-session state access via thread_id guessing | Checkpoint savers index by `thread_id`. Without application-level auth, any caller with a valid thread_id can access that thread's state. | Providing the `Auth` handler system for access control (`libs/sdk-py/langgraph_sdk/auth/__init__.py:Auth`); user must implement auth handlers |
+| Tool shadowing via duplicate registration | If a user registers two tools with the same name, ToolNode uses the last one. This is user misconfiguration. | Documenting tool registration semantics |
+| Indirect prompt injection via tool output | LLM reads tool output and may follow injected instructions. This is a fundamental LLM limitation, not a framework vulnerability. | Not including tool output in system prompts; user owns output handling |
+| Model selecting dangerous tool arguments | An LLM may generate SQL injection, path traversal, or command injection payloads as tool arguments. The risk depends entirely on what the user's tools do with those arguments. | Routing tool calls to registered tools only; user owns tool input validation |
+| RCE via user-provided node code | `add_node()` and `@entrypoint`/`@task` accept arbitrary callables. A malicious node can do anything. This is by design — the user controls their own code. | Executing nodes within the graph runtime; user owns node code safety |
+| SSRF via RemoteGraph URL | User provides the `url` parameter to `RemoteGraph`. Pointing it at an internal service is the user's decision. | Documenting that `url` should be a trusted endpoint; user owns URL selection |
+| Malicious SDK Encryption handler | Encryption handlers are developer-authored server-side code. A malicious handler has full process access, equivalent to any application code. | Validating handler signature (async, param count); handler behavior is the developer's responsibility |
+
+### Rationale
+
+**Prompt injection and tool execution**: LangGraph's `ToolNode` validates tool names against the registered set but does not inspect or sanitize argument values. This is the correct boundary — the framework cannot know what constitutes a "safe" argument for an arbitrary user-defined tool. The tool's own Pydantic schema and implementation must validate inputs. The framework's responsibility is to not execute unregistered tools and to correctly route registered ones. The injection system (InjectedState/InjectedStore/ToolRuntime) is safe because system-injected values always overwrite LLM-supplied collisions via dict merge order, and injected parameter names are hidden from the LLM's tool schema.
+
+**State integrity**: LangGraph channels enforce type contracts (e.g., `LastValue` accepts one value per step, `BinaryOperatorAggregate` applies a reducer). The framework validates graph structure at compile time (`libs/langgraph/langgraph/pregel/_validate.py:validate_graph`). However, the semantic correctness of state updates is the user's responsibility — the framework cannot know what values are "valid" for a user-defined state schema.
+
+**Checkpoint access control**: The framework provides `BaseCheckpointSaver` as an abstract interface and the `Auth` handler system for authorization (`libs/sdk-py/langgraph_sdk/auth/__init__.py:Auth`). It does not enforce authentication by default because it operates as a library, not a server. The `langgraph-api` server layer (out of scope) is responsible for enforcing auth on API endpoints. Users embedding LangGraph directly must implement their own access controls.
+
+**Encryption handler safety**: The SDK Encryption module (`libs/sdk-py/langgraph_sdk/encryption/`) provides a registration framework for developer-authored encryption handlers. These handlers run server-side with full process access, identical to any application code. A buggy or malicious handler could return crafted data, but this is the same trust model as any developer-written code. The SDK validates handler shape (async, 2-param) but not handler behavior — this is the correct boundary for developer-trust-level code.
+
+---
+
+## Investigated and Dismissed
+
+| ID | Original Threat | Investigation | Evidence | Conclusion |
+|----|----------------|---------------|----------|------------|
+| D1 | SQL injection via filter keys in PostgreSQL store | Traced filter key handling through `libs/checkpoint-postgres/langgraph/store/postgres/base.py:_get_filter_condition`. All filter operations use parameterized queries with `%s` placeholders. Keys map to `json_extract` path operators with type-safe wrappers. | `libs/checkpoint-postgres/langgraph/store/postgres/base.py:_get_filter_condition` — parameterized `%s` for all value bindings; key names used in `value->%s` path expressions are also parameterized | Disproven: All SQL operations in PostgreSQL store are fully parameterized. No injection vector. |
+| D2 | SQL injection via filter keys in SQLite store (post-fix) | Traced current filter handling through `libs/checkpoint-sqlite/langgraph/store/sqlite/base.py` and `libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/utils.py:_validate_filter_key`. Regex `^[a-zA-Z0-9_.-]+$` applied to all filter keys before use in `json_extract()` expressions. | `libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/utils.py:_validate_filter_key` — regex validation blocks injection characters. Published advisories GHSA-9rwj-6rc7-p77c and GHSA-7p73-8jqx-23r8 confirmed fixed. | Disproven: SQL injection in SQLite store filter keys is remediated by regex validation. |
+| D3 | Command injection via CLI subprocess execution | Traced CLI subprocess invocation path. `libs/cli/langgraph_cli/exec.py:subp_exec` uses `asyncio.create_subprocess_exec` with list-based arguments (not `shell=True`). `has_disallowed_build_command_content` blocks shell metacharacters in user-provided Dockerfile lines. | `libs/cli/langgraph_cli/exec.py:subp_exec` — explicit exec-style invocation; `libs/cli/langgraph_cli/config.py:has_disallowed_build_command_content` — regex blocks `\|`, `;`, `$`, `>`, `<`, backtick, `\`, single `&` | Disproven: CLI uses exec-style subprocess and validates build command content. No shell injection vector. |
+| D4 | Tool argument injection via InjectedState/InjectedStore dict-splatting | Investigated whether LLM-generated tool call arguments could override system-injected values (InjectedState, InjectedStore, ToolRuntime) via key collision in the dict merge at `libs/prebuilt/langgraph/prebuilt/tool_node.py:ToolNode._inject_tool_args` line 1380. Traced four independent defense layers. | (1) `tool_call_schema` at langchain-core `base.py` filters injected params from LLM schema. (2) `{**llm_args, **injected_args}` merge puts system values last — system wins on collision. (3) Pydantic `model_validate` with `extra="ignore"` drops unknown keys. (4) Output construction at `base.py` only includes declared model fields. | Disproven: Four-layer defense prevents LLM arguments from overriding system-injected values. Merge order guarantees system values win. No adversarial collision path exists. |
+
+---
+
+## External Context
+
+### Published Security Advisories
+
+| GHSA ID | Severity | Summary | CWEs | Relevance |
+|---------|----------|---------|------|-----------|
+| GHSA-g48c-2wqr-h844 | Medium | Unsafe msgpack deserialization in LangGraph checkpoint loading | — | Directly relates to T1 — patched in 1.0.10, confirms attack path via crafted msgpack payloads |
+| GHSA-mhr3-j7m5-c7c9 | Medium | BaseCache Deserialization RCE | CWE-502 | Directly relates to T1 — msgpack deserialization in cache layer |
+| GHSA-9rwj-6rc7-p77c | High | SQL injection via metadata filter key in SQLite checkpointer | CWE-89 | Fixed via `_validate_filter_key()` regex — see D2 |
+| GHSA-wwqv-p2pp-99h5 | High | RCE in JSON mode of JsonPlusSerializer | CWE-502 | Directly relates to T3 — `lc:2` constructor import |
+| GHSA-7p73-8jqx-23r8 | High | SQLite Filter Key SQL Injection in SqliteStore | CWE-89 | Fixed via `_validate_filter_key()` regex — see D2 |
+
+**Pattern**: 3 of 5 published advisories involve CWE-502 (insecure deserialization) in the checkpoint serialization layer. This confirms the checkpoint storage boundary (TB2) as the highest-risk area. The extensive closed advisory history (~15 deserialization bypass attempts) further validates this assessment. No new published advisories since the prior assessment (2026-03-27).
+
+
+---
+
+## Revision History
+
+| Date | Author | Changes |
+|------|--------|---------|
+| 2026-03-04 | Generated | Initial threat model |
+| 2026-03-04 | Updated | Added C13 (Functional API), C14 (BaseCache), DF11. Updated T1 for BaseCache/serde event hooks. Added GHSA-mhr3-j7m5-c7c9 and GHSA-9rwj-6rc7-p77c. Updated CLI config scope. Added External Context section. |
+| 2026-03-27 | Deep refinement | **Mode upgraded to Deep.** Added: Data Classification section (DC1-DC8 with detailed analysis for Critical/High entries). Added: C15 (Serde Event Hooks), C16 (Auth System). Added: Default? column to Components. Added: Classification column to Data Flows. Added: DF12-DF13 (SDK redirect flows). Added: T9 (SDK API key leak via Location redirect), T10 (EncryptedSerializer encryption bypass), T11 (unbounded checkpoint retention). Added: Validation column to Threats with flaw validation for High/Critical. Added: Investigated and Dismissed section (D1-D3: SQL injection and CLI command injection disproven). Added: Input Source Coverage section. Updated external context with GHSA-g48c-2wqr-h844 (new published advisory). Updated all code references to file:SymbolName notation. Expanded trust boundary details. |
+| 2026-03-30 | Diagram and Default? corrections | Fixed architecture diagram: merged "User Code" and "User-Registered Tools" into single "User Application Code" boundary; removed @entrypoint/@task as separate diagram elements (both compile to Pregel — authoring style, not separate component). Fixed Default? column: C3 ToolNode → No (explicit opt-in required); C8 CLI → No (separate install). |
+| 2026-03-28 | Deep update | **Added:** C17 (SDK Encryption Handlers — beta at-rest encryption framework). DC9 (SDK Encryption context metadata). TB5 (SDK Encryption Handler boundary). DF14 (ToolRuntime injection flow), DF15 (Encryption handler registration flow). D4 (Tool argument injection via InjectedState dict-splatting — disproven with 4-layer defense evidence). **Updated:** C1 description (v1/v2 output, durability modes, interrupt_before/after). C2 description (SAFE_MSGPACK_TYPES now 47 entries including langchain_core messages, Document, GetOp). C3 description (InjectedState/InjectedStore/ToolRuntime injection support, _inject_tool_args entry point). C8 description (WebhookUrlPolicy for SSRF protection). TB1 details (tool injection merge order guarantees). TB2 details (47 safe types, updated allowlist composition). TB4 details (WebhookUrlPolicy). DF4 description (injection merge semantics). T1 details (noted secure_pickle.py proposed but never merged). T4 details (Interrupt deprecated_kwargs ns parameter). Input Source Coverage (LLM output row updated with injection validation points, encryption handler row added). Out-of-Scope Threats (malicious encryption handler pattern added). Commit updated to 0ba22143. External context confirmed no new published advisories. |

.github/actions/uv_setup/action.yml

@@ -0,0 +1,35 @@
+# Helper to set up Python and uv with caching
+
+name: uv-install
+description: Set up Python and uv with caching
+
+inputs:
+  python-version:
+    description: Python version, supporting MAJOR.MINOR only
+    required: true
+  enable-cache:
+    description: Enable caching for uv dependencies
+    required: false
+    default: "true"
+  cache-suffix:
+    description: Custom cache key suffix for cache invalidation
+    required: false
+    default: ""
+  working-directory:
+    description: Working directory for cache glob scoping
+    required: false
+    default: "**"
+
+runs:
+  using: composite
+  steps:
+    - name: Install uv and set the python version
+      uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7.6.0
+      with:
+        python-version: ${{ inputs.python-version }}
+        enable-cache: ${{ inputs.enable-cache }}
+        cache-dependency-glob: |
+          ${{ inputs.working-directory }}/pyproject.toml
+          ${{ inputs.working-directory }}/uv.lock
+          ${{ inputs.working-directory }}/requirements*.txt
+        cache-suffix: ${{ inputs.cache-suffix }}

.github/dependabot.yml

@@ -3,109 +3,186 @@ updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/checkpoint"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
+
   - package-ecosystem: "uv"
     directory: "/libs/checkpoint-conformance"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
-
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/checkpoint-postgres"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/checkpoint-sqlite"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/cli"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/langgraph"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/prebuilt"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "uv"
     directory: "/libs/sdk-py"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "npm"
     directory: "/libs/cli/js-examples"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"
 
   - package-ecosystem: "npm"
     directory: "/libs/cli/js-monorepo-example"
     schedule:
-      interval: "weekly"
-      day: "monday"
+      interval: "monthly"
     groups:
-      all-dependencies:
+      minor-and-patch:
         patterns:
           - "*"
+        update-types:
+          - "minor"
+          - "patch"
+      major:
+        patterns:
+          - "*"
+        update-types:
+          - "major"

.github/workflows/_integration_test.yml

@@ -37,21 +37,20 @@ jobs:
       run:
         working-directory: libs/cli
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Get changed files
         id: changed-files
         if: github.event_name != 'workflow_dispatch'
-        uses: Ana06/get-changed-files@v2.3.0
+        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
         with:
           filter: "libs/cli/**"
       - name: Set up Python ${{ matrix.python-version }}
         if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ matrix.python-version }}
-          enable-cache: true
-          cache-suffix: "cli-integration-test"
-          ignore-nothing-to-cache: true
+          enable-cache: "false"
+          working-directory: libs/cli
       - name: Install cli globally
         if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
         run: pip install -e .
@@ -117,18 +116,18 @@ jobs:
           timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-h
           echo "Finished starting up langgraph-test-h"
           LANGGRAPH_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langgraph'); print(v);")
-          if [ "$LANGGRAPH_VERSION" != "1.0.8" ]; then
-            echo "LANGGRAPH_VERSION != 1.0.8; $LANGGRAPH_VERSION"
+          if [ "$LANGGRAPH_VERSION" != "1.1.5" ]; then
+            echo "LANGGRAPH_VERSION != 1.1.5; $LANGGRAPH_VERSION"
             exit 1
           fi
           LANGCHAIN_OPENAI_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-openai'); print(v);")
-          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.0.1" ]; then
-            echo "LANGCHAIN_OPENAI_VERSION != 1.0.1; $LANGCHAIN_OPENAI_VERSION"
+          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.1.14" ]; then
+            echo "LANGCHAIN_OPENAI_VERSION != 1.1.14; $LANGCHAIN_OPENAI_VERSION"
             exit 1
           fi
           LANGCHAIN_ANTHROPIC_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-anthropic'); print(v);")
-          if [ "$LANGCHAIN_ANTHROPIC_VERSION" != "1.0.0a5" ]; then
-            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.0.0a5; $LANGCHAIN_ANTHROPIC_VERSION"
+          if [ "$LANGCHAIN_ANTHROPIC_VERSION" != "1.4.6" ]; then
+            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.4.6; $LANGCHAIN_ANTHROPIC_VERSION"
             exit 1
           fi
 
@@ -137,3 +136,33 @@ jobs:
         working-directory: libs/cli/examples/graph_prerelease_reqs_fail
         run: |
           langgraph build -t langgraph-test-i || [ $? -eq 1 ]
+
+      - name: Build uv simple service
+        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
+        working-directory: libs/cli/uv-examples/simple
+        run: |
+          langgraph build -t langgraph-test-uv-simple
+      - name: Test uv simple service
+        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' && env.HAS_LANGSMITH_API_KEY == 'true' }}
+        working-directory: libs/cli/uv-examples/simple
+        env:
+          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
+        run: |
+          cp .env.example .env
+          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
+          timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-uv-simple
+
+      - name: Build uv monorepo service
+        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
+        working-directory: libs/cli/uv-examples/monorepo/apps/agent
+        run: |
+          langgraph build -t langgraph-test-uv-monorepo
+      - name: Test uv monorepo service
+        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' && env.HAS_LANGSMITH_API_KEY == 'true' }}
+        working-directory: libs/cli/uv-examples/monorepo/apps/agent
+        env:
+          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
+        run: |
+          cp .env.example .env
+          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
+          timeout 60 python ../../../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-uv-monorepo

.github/workflows/_lint.yml

@@ -31,36 +31,26 @@ jobs:
           - "3.12"
     name: "lint #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Get changed files
         id: changed-files
         if: github.event_name != 'workflow_dispatch'
-        uses: Ana06/get-changed-files@v2.3.0
+        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
         with:
           filter: "${{ inputs.working-directory }}/**"
       - name: Set up Python ${{ matrix.python-version }}
         if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ matrix.python-version }}
-          enable-cache: true
           cache-suffix: lint-${{ inputs.working-directory }}
+          working-directory: ${{ inputs.working-directory }}
 
       - name: Install dependencies
         if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
         working-directory: ${{ inputs.working-directory }}
         run: uv sync --frozen --group lint
 
-      - name: Get .mypy_cache to speed up mypy
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
-        uses: actions/cache@v5
-        env:
-          SEGMENT_DOWNLOAD_TIMEOUT_MIN: "2"
-        with:
-          path: |
-            ${{ inputs.working-directory }}/.mypy_cache
-          key: mypy-lint-${{ runner.os }}-${{ runner.arch }}-py${{ matrix.python-version }}-${{ inputs.working-directory }}-${{ hashFiles(format('{0}/uv.lock', inputs.working-directory)) }}
-
       - name: Analysing package code with our lint
         if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
         working-directory: ${{ inputs.working-directory }}
@@ -77,16 +67,6 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
         run: uv sync --group lint
 
-      - name: Get .mypy_cache_test to speed up mypy
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
-        uses: actions/cache@v5
-        env:
-          SEGMENT_DOWNLOAD_TIMEOUT_MIN: "2"
-        with:
-          path: |
-            ${{ inputs.working-directory }}/.mypy_cache_test
-          key: mypy-test-${{ runner.os }}-${{ runner.arch }}-py${{ matrix.python-version }}-${{ inputs.working-directory }}-${{ hashFiles(format('{0}/uv.lock', inputs.working-directory)) }}
-
       - name: Analysing tests with our lint
         if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
         working-directory: ${{ inputs.working-directory }}

.github/workflows/_sdk_integration_test.yml

@@ -0,0 +1,85 @@
+name: sdk-py integration test
+
+on:
+  workflow_call:
+    secrets:
+      LANGSMITH_API_KEY:
+        required: false
+      DOCKERHUB_USERNAME:
+        required: false
+      DOCKERHUB_RO_TOKEN:
+        required: false
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    name: "sdk-py integration"
+    defaults:
+      run:
+        working-directory: libs/sdk-py
+    env:
+      HAS_LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY != '' }}
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+
+      - name: Set up Python
+        uses: ./.github/actions/uv_setup
+        with:
+          python-version: "3.13"
+          cache-suffix: sdk-py-integration
+          working-directory: libs/sdk-py
+
+      - name: Login to Docker Hub
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        if: ${{ !github.event.pull_request.head.repo.fork }}
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_RO_TOKEN }}
+
+      - name: Install dependencies
+        shell: bash
+        run: uv sync --frozen --group test --no-dev
+
+      - name: Skip if LANGSMITH_API_KEY is not available
+        if: env.HAS_LANGSMITH_API_KEY != 'true'
+        run: |
+          echo "LANGSMITH_API_KEY is not set (likely a fork PR). Skipping integration tests."
+          exit 0
+
+      - name: Bring up integration stack
+        if: env.HAS_LANGSMITH_API_KEY == 'true'
+        working-directory: libs/sdk-py/integration
+        env:
+          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
+        run: docker compose up -d --build
+
+      - name: Wait for API healthcheck
+        if: env.HAS_LANGSMITH_API_KEY == 'true'
+        run: |
+          for i in $(seq 1 60); do
+            if curl -sf http://localhost:2024/ok >/dev/null; then
+              echo "API ready after ${i}s"
+              exit 0
+            fi
+            sleep 2
+          done
+          echo "API failed to become healthy within 120s"
+          docker compose -f libs/sdk-py/integration/docker-compose.yml logs api | tail -100
+          exit 1
+
+      - name: Run integration suite
+        if: env.HAS_LANGSMITH_API_KEY == 'true'
+        run: uv run pytest tests/integration/ -m integration
+
+      - name: Dump api logs on failure
+        if: failure() && env.HAS_LANGSMITH_API_KEY == 'true'
+        working-directory: libs/sdk-py/integration
+        run: docker compose logs api | tail -200
+
+      - name: Tear down stack
+        if: always() && env.HAS_LANGSMITH_API_KEY == 'true'
+        working-directory: libs/sdk-py/integration
+        run: docker compose down -v

.github/workflows/_test.yml

@@ -25,15 +25,15 @@ jobs:
 
     name: "test #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up Python ${{ matrix.python-version }}
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ matrix.python-version }}
-          enable-cache: true
           cache-suffix: test-${{ inputs.working-directory }}
+          working-directory: ${{ inputs.working-directory }}
       - name: Login to Docker Hub
-        uses: docker/login-action@v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test_langgraph.yml

@@ -23,15 +23,15 @@ jobs:
         working-directory: libs/langgraph
     name: "test #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up Python ${{ matrix.python-version }}
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ matrix.python-version }}
-          enable-cache: true
           cache-suffix: "test-langgraph"
+          working-directory: libs/langgraph
       - name: Login to Docker Hub
-        uses: docker/login-action@v4
+        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}

.github/workflows/_test_release.yml

@@ -23,14 +23,14 @@ jobs:
       version: ${{ steps.check-version.outputs.version }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
-      - name: Set up Python $${ env.PYTHON_VERSION }}
-        uses: astral-sh/setup-uv@v7
+      - name: Set up Python ${{ env.PYTHON_VERSION }}
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          enable-cache: true
           cache-suffix: "release"
+          working-directory: ${{ inputs.working-directory }}
 
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
@@ -48,7 +48,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: test-dist
           path: ${{ inputs.working-directory }}/dist/
@@ -74,15 +74,15 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: test-dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish to test PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true

.github/workflows/baseline.yml

@@ -17,20 +17,20 @@ jobs:
       run:
         working-directory: libs/langgraph
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - run: SHA=$(git rev-parse HEAD) && echo "SHA=$SHA" >> $GITHUB_ENV
       - name: Set up Python 3.11
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: "3.11"
-          enable-cache: true
           cache-suffix: "bench"
+          working-directory: libs/langgraph
       - name: Install dependencies
         run: uv sync --group test
       - name: Run benchmarks
         run: OUTPUT=out/benchmark-baseline.json make -s benchmark
       - name: Save outputs
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           key: ${{ runner.os }}-benchmark-baseline-${{ env.SHA }}
           path: |

.github/workflows/bench.yml

@@ -15,22 +15,22 @@ jobs:
       run:
         working-directory: libs/langgraph
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - id: files
         name: Get changed files
-        uses: Ana06/get-changed-files@v2.3.0
+        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
         with:
           format: json
       - name: Set up Python 3.11
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: "3.11"
-          enable-cache: true
           cache-suffix: "bench"
+          working-directory: libs/langgraph
       - name: Install dependencies
         run: uv sync --group test
       - name: Download baseline
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
         with:
           key: ${{ runner.os }}-benchmark-baseline
           restore-keys: |
@@ -57,15 +57,19 @@ jobs:
             echo EOF
           } >> "$GITHUB_OUTPUT"
       - name: Annotation
-        uses: actions/github-script@v8
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        env:
+          CHANGED_FILES: ${{ steps.files.outputs.added_modified_renamed }}
+          BENCHMARK_OUTPUT: ${{ steps.benchmark.outputs.OUTPUT }}
+          COMPARE_OUTPUT: ${{ steps.compare.outputs.OUTPUT }}
         with:
           script: |
-            const file = JSON.parse(`${{ steps.files.outputs.added_modified_renamed }}`)[0]
-            core.notice(`${{ steps.benchmark.outputs.OUTPUT }}`, {
+            const file = JSON.parse(process.env.CHANGED_FILES || "[]")[0]
+            core.notice(process.env.BENCHMARK_OUTPUT || "", {
               title: 'Benchmark results',
               file,
             })
-            core.notice(`${{ steps.compare.outputs.OUTPUT }}`, {
+            core.notice(process.env.COMPARE_OUTPUT || "", {
               title: 'Comparison against main',
               file,
             })

.github/workflows/ci.yml

@@ -28,9 +28,10 @@ jobs:
     outputs:
       python: ${{ steps.filter.outputs.python || 'true' }}
       deps: ${{ steps.filter.outputs.deps || 'true' }}
+      sdk_py: ${{ steps.filter.outputs.sdk_py || 'true' }}
     steps:
-      - uses: actions/checkout@v6
-      - uses: dorny/paths-filter@v3
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: dorny/paths-filter@7b450fff21473bca461d4b92ce414b9d0420d706 # v4
         if: github.event_name != 'workflow_dispatch'
         id: filter
         with:
@@ -47,6 +48,12 @@ jobs:
             deps:
               - '**/pyproject.toml'
               - '**/uv.lock'
+            sdk_py:
+              - 'libs/sdk-py/**'
+              # The integration suite runs the local langgraph core inside the
+              # server (see libs/sdk-py/integration/Dockerfile), so any core
+              # change is now exercised end-to-end and should trigger it.
+              - 'libs/langgraph/**'
 
   lint:
     needs: changes
@@ -105,9 +112,9 @@ jobs:
     name: "Check SDK methods matching"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: "3.11"
       - name: Run check_sdk_methods script
@@ -123,13 +130,13 @@ jobs:
         python-version:
           - "3.13"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up Python ${{ matrix.python-version }}
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: "3.13"
-          enable-cache: true
           cache-suffix: "schema-check-cli"
+          working-directory: libs/cli
       - name: Install CLI dependencies
         run: |
           cd libs/cli
@@ -156,6 +163,13 @@ jobs:
     uses: ./.github/workflows/_integration_test.yml
     secrets: inherit
 
+  sdk-py-integration-test:
+    needs: changes
+    if: needs.changes.outputs.sdk_py == 'true'
+    name: "sdk-py integration test"
+    uses: ./.github/workflows/_sdk_integration_test.yml
+    secrets: inherit
+
   ci_success:
     name: "CI Success"
     needs:
@@ -166,6 +180,7 @@ jobs:
         check-sdk-methods,
         check-schema,
         integration-test,
+        sdk-py-integration-test,
       ]
     if: |
       always()

.github/workflows/deploy-redirects.yml

@@ -26,10 +26,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Setup Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
         with:
           python-version: '3.11'
 
@@ -37,13 +37,13 @@ jobs:
         run: python docs/generate_redirects.py
 
       - name: Setup Pages
-        uses: actions/configure-pages@v5
+        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d # v6.0.0
 
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v4
+        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
         with:
           path: 'docs/_site'
 
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0

.github/workflows/pr_lint.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Validate PR Title
-        uses: amannn/action-semantic-pull-request@v6
+        uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
@@ -41,6 +41,7 @@ jobs:
             docs
             ci
             deps
+            deps-dev
           requireScope: false
           ignoreLabels: |
             ignore-lint-pr-title

.github/workflows/release.yml

@@ -25,14 +25,15 @@ jobs:
       tag: ${{ steps.check-version.outputs.tag }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          enable-cache: true
           cache-suffix: "release"
+          enable-cache: false
+          working-directory: ${{ inputs.working-directory }}
 
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
@@ -50,7 +51,7 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -86,7 +87,7 @@ jobs:
     outputs:
       release-body: ${{ steps.generate-release-body.outputs.release-body }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           repository: langchain-ai/langgraph
           path: langgraph
@@ -157,7 +158,7 @@ jobs:
       - test-pypi-publish
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       # We explicitly *don't* set up caching here. This ensures our tests are
       # maximally sensitive to catching breakage.
@@ -173,10 +174,11 @@ jobs:
       #   used in the real world.
 
       - name: Set up Python
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          enable-cache: true
+          enable-cache: false
+          working-directory: ${{ inputs.working-directory }}
 
       - name: Import published package
         shell: bash
@@ -260,22 +262,23 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          enable-cache: true
           cache-suffix: "release"
+          enable-cache: false
+          working-directory: ${{ inputs.working-directory }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true
@@ -301,22 +304,23 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Set up Python
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          enable-cache: true
           cache-suffix: "release"
+          enable-cache: false
+          working-directory: ${{ inputs.working-directory }}
 
-      - uses: actions/download-artifact@v8
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Create Tag
-        uses: ncipollo/release-action@v1
+        uses: ncipollo/release-action@339a81892b84b4eeb0f6e744e4574d79d0d9b8dd # v1
         with:
           artifacts: "dist/*"
           token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/reopen_on_assignment.yml

@@ -0,0 +1,195 @@
+# Reopen PRs that were auto-closed by require_issue_link.yml when the
+# contributor was not assigned to the linked issue. When a maintainer
+# assigns the contributor to the issue, this workflow finds matching
+# closed PRs, verifies the issue link, and reopens them.
+#
+# Uses the default GITHUB_TOKEN (not a PAT or app token) so that the
+# reopen and label-removal events do NOT re-trigger other workflows.
+# GitHub suppresses events created by the default GITHUB_TOKEN within
+# workflow runs to prevent infinite loops.
+
+name: Reopen PR on Issue Assignment
+
+on:
+  issues:
+    types: [assigned]
+
+permissions:
+  contents: read
+
+jobs:
+  reopen-linked-prs:
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      pull-requests: write
+
+    steps:
+      - name: Find and reopen matching PRs
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const issueNumber = context.payload.issue.number;
+            const assignee = context.payload.assignee.login;
+
+            console.log(
+              `Issue #${issueNumber} assigned to ${assignee} — searching for closed PRs to reopen`,
+            );
+
+            const q = [
+              `is:pr`,
+              `is:closed`,
+              `author:${assignee}`,
+              `label:missing-issue-link`,
+              `repo:${owner}/${repo}`,
+            ].join(' ');
+
+            let data;
+            try {
+              ({ data } = await github.rest.search.issuesAndPullRequests({
+                q,
+                per_page: 30,
+              }));
+            } catch (e) {
+              throw new Error(
+                `Failed to search for closed PRs to reopen after assigning ${assignee} ` +
+                `to #${issueNumber} (HTTP ${e.status ?? 'unknown'}): ${e.message}`,
+              );
+            }
+
+            if (data.total_count === 0) {
+              console.log('No matching closed PRs found');
+              return;
+            }
+
+            console.log(`Found ${data.total_count} candidate PR(s)`);
+
+            // Must stay in sync with the identical pattern in require_issue_link.yml
+            const pattern = /(?:close[sd]?|fix(?:e[sd])?|resolve[sd]?)\s*#(\d+)/gi;
+
+            for (const item of data.items) {
+              const prNumber = item.number;
+              const body = item.body || '';
+              const matches = [...body.matchAll(pattern)];
+              const referencedIssues = matches.map(m => parseInt(m[1], 10));
+
+              if (!referencedIssues.includes(issueNumber)) {
+                console.log(`PR #${prNumber} does not reference #${issueNumber} — skipping`);
+                continue;
+              }
+
+              // Skip if already bypassed
+              const labels = item.labels.map(l => l.name);
+              if (labels.includes('bypass-issue-check')) {
+                console.log(`PR #${prNumber} already has bypass-issue-check — skipping`);
+                continue;
+              }
+
+              // Reopen first, remove label second — a closed PR that still has
+              // missing-issue-link is recoverable; a closed PR with the label
+              // stripped is invisible to both workflows.
+              try {
+                await github.rest.pulls.update({
+                  owner,
+                  repo,
+                  pull_number: prNumber,
+                  state: 'open',
+                });
+                console.log(`Reopened PR #${prNumber}`);
+              } catch (e) {
+                if (e.status === 422) {
+                  // Head branch deleted — PR is unrecoverable. Notify the
+                  // contributor so they know to open a new PR.
+                  core.warning(`Cannot reopen PR #${prNumber}: head branch was likely deleted`);
+                  try {
+                    await github.rest.issues.createComment({
+                      owner,
+                      repo,
+                      issue_number: prNumber,
+                      body:
+                        `You have been assigned to #${issueNumber}, but this PR could not be ` +
+                        `reopened because the head branch has been deleted. Please open a new ` +
+                        `PR referencing the issue.`,
+                    });
+                  } catch (commentErr) {
+                    core.warning(
+                      `Also failed to post comment on PR #${prNumber}: ${commentErr.message}`,
+                    );
+                  }
+                  continue;
+                }
+                // Transient errors (rate limit, 5xx) should fail the job so
+                // the label is NOT removed and the run can be retried.
+                throw e;
+              }
+
+              // Remove missing-issue-link label only after successful reopen
+              try {
+                await github.rest.issues.removeLabel({
+                  owner,
+                  repo,
+                  issue_number: prNumber,
+                  name: 'missing-issue-link',
+                });
+                console.log(`Removed missing-issue-link from PR #${prNumber}`);
+              } catch (e) {
+                if (e.status !== 404) throw e;
+              }
+
+              // Minimize stale enforcement comment (best-effort;
+              // sync w/ require_issue_link.yml minimize blocks)
+              try {
+                const marker = '<!-- require-issue-link -->';
+                const comments = await github.paginate(
+                  github.rest.issues.listComments,
+                  { owner, repo, issue_number: prNumber, per_page: 100 },
+                );
+                const stale = comments.find(c => c.body && c.body.includes(marker));
+                if (stale) {
+                  await github.graphql(`
+                    mutation($id: ID!) {
+                      minimizeComment(input: {subjectId: $id, classifier: OUTDATED}) {
+                        minimizedComment { isMinimized }
+                      }
+                    }
+                  `, { id: stale.node_id });
+                  console.log(`Minimized stale enforcement comment ${stale.id} as outdated`);
+                }
+              } catch (e) {
+                core.warning(`Could not minimize stale comment on PR #${prNumber}: ${e.message}`);
+              }
+
+              // Re-run the failed require_issue_link check so it picks up the
+              // new assignment.  The re-run uses the original event payload but
+              // fetches live issue data, so the assignment check will pass.
+              //
+              // Limitation: we look up runs by the PR's current head SHA.  If the
+              // contributor pushed new commits while the PR was closed, head.sha
+              // won't match the SHA of the original failed run and the query will
+              // return 0 results.  This is acceptable because any push after reopen
+              // triggers a fresh require_issue_link run against the new SHA.
+              try {
+                const { data: pr } = await github.rest.pulls.get({
+                  owner, repo, pull_number: prNumber,
+                });
+                const { data: runs } = await github.rest.actions.listWorkflowRuns({
+                  owner, repo,
+                  workflow_id: 'require_issue_link.yml',
+                  head_sha: pr.head.sha,
+                  status: 'failure',
+                  per_page: 1,
+                });
+                if (runs.workflow_runs.length > 0) {
+                  await github.rest.actions.reRunWorkflowFailedJobs({
+                    owner, repo,
+                    run_id: runs.workflow_runs[0].id,
+                  });
+                  console.log(`Re-ran failed require_issue_link run ${runs.workflow_runs[0].id} for PR #${prNumber}`);
+                } else {
+                  console.log(`No failed require_issue_link runs found for PR #${prNumber} — skipping re-run`);
+                }
+              } catch (e) {
+                core.warning(`Could not re-run require_issue_link check for PR #${prNumber} (HTTP ${e.status ?? 'unknown'}): ${e.message}`);
+              }
+            }

.github/workflows/require_issue_link.yml

@@ -0,0 +1,467 @@
+# Require external PRs to reference an approved issue (e.g. Fixes #NNN) and
+# the PR author to be assigned to that issue. On failure the PR is
+# labeled "missing-issue-link", commented on, and closed.
+#
+# Maintainer override: an org member can reopen the PR or remove
+# "missing-issue-link" — both add "bypass-issue-check" and reopen.
+#
+# Dependency: tag-external-prs.yml must apply the "external" label
+# first. This workflow does NOT trigger on "opened" (new PRs have no labels
+# yet, so the gate would always skip).
+
+name: Require Issue Link
+
+on:
+  pull_request_target:
+    # NEVER CHECK OUT UNTRUSTED CODE FROM A PR's HEAD IN A pull_request_target JOB.
+    # Doing so would allow attackers to execute arbitrary code in the context of your repository.
+    types: [edited, reopened, labeled, unlabeled]
+
+# ──────────────────────────────────────────────────────────────────────────────
+# Enforcement gate: set to 'true' to activate the issue link requirement.
+# When 'false', the workflow still runs the check logic (useful for dry-run
+# visibility) but will NOT label, comment, close, or fail PRs.
+# ──────────────────────────────────────────────────────────────────────────────
+env:
+  ENFORCE_ISSUE_LINK: "true"
+
+permissions:
+  contents: read
+
+jobs:
+  check-issue-link:
+    # Run when the "external" label is added, on edit/reopen if already labeled,
+    # or when "missing-issue-link" is removed (triggers maintainer override check).
+    # Skip entirely when the PR already carries "trusted-contributor" or
+    # "bypass-issue-check".
+    if: >-
+      !contains(github.event.pull_request.labels.*.name, 'trusted-contributor') &&
+      !contains(github.event.pull_request.labels.*.name, 'bypass-issue-check') &&
+      (
+        (github.event.action == 'labeled' && github.event.label.name == 'external') ||
+        (github.event.action == 'unlabeled' && github.event.label.name == 'missing-issue-link' && contains(github.event.pull_request.labels.*.name, 'external')) ||
+        (github.event.action != 'labeled' && github.event.action != 'unlabeled' && contains(github.event.pull_request.labels.*.name, 'external'))
+      )
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+      pull-requests: write
+
+    steps:
+      - name: Check for issue link and assignee
+        id: check-link
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.pull_request.number;
+            const action = context.payload.action;
+
+            // ── Helper: ensure a label exists, then add it to the PR ────────
+            async function ensureAndAddLabel(labelName, color) {
+              try {
+                await github.rest.issues.getLabel({ owner, repo, name: labelName });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+                try {
+                  await github.rest.issues.createLabel({ owner, repo, name: labelName, color });
+                } catch (createErr) {
+                  // 422 = label was created by a concurrent run between our
+                  // GET and POST — safe to ignore.
+                  if (createErr.status !== 422) throw createErr;
+                }
+              }
+              await github.rest.issues.addLabels({
+                owner, repo, issue_number: prNumber, labels: [labelName],
+              });
+            }
+
+            // ── Helper: check if the user who triggered this event (reopened
+            // the PR / removed the label) has write+ access on the repo ───
+            // Uses the repo collaborator permission endpoint instead of the
+            // org membership endpoint. The org endpoint requires the caller
+            // to be an org member, which GITHUB_TOKEN (an app installation
+            // token) never is — so it always returns 403.
+            async function senderIsOrgMember() {
+              const sender = context.payload.sender?.login;
+              if (!sender) {
+                throw new Error('Event has no sender — cannot check permissions');
+              }
+              try {
+                const { data } = await github.rest.repos.getCollaboratorPermissionLevel({
+                  owner, repo, username: sender,
+                });
+                const perm = data.permission;
+                if (['admin', 'maintain', 'write'].includes(perm)) {
+                  console.log(`${sender} has ${perm} permission — treating as maintainer`);
+                  return { isMember: true, login: sender };
+                }
+                console.log(`${sender} has ${perm} permission — not a maintainer`);
+                return { isMember: false, login: sender };
+              } catch (e) {
+                if (e.status === 404) {
+                  console.log(`Cannot check permissions for ${sender} — treating as non-maintainer`);
+                  return { isMember: false, login: sender };
+                }
+                const status = e.status ?? 'unknown';
+                throw new Error(
+                  `Permission check failed for ${sender} (HTTP ${status}): ${e.message}`,
+                );
+              }
+            }
+
+            // ── Helper: apply maintainer bypass (shared by both override paths) ──
+            async function applyMaintainerBypass(reason) {
+              console.log(reason);
+
+              // Remove missing-issue-link if present
+              try {
+                await github.rest.issues.removeLabel({
+                  owner, repo, issue_number: prNumber, name: 'missing-issue-link',
+                });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+              }
+
+              // Reopen before adding bypass label — a failed reopen is more
+              // actionable than a closed PR with a bypass label stuck on it.
+              if (context.payload.pull_request.state === 'closed') {
+                try {
+                  await github.rest.pulls.update({
+                    owner, repo, pull_number: prNumber, state: 'open',
+                  });
+                  console.log(`Reopened PR #${prNumber}`);
+                } catch (e) {
+                  // 422 if head branch deleted; 403 if permissions insufficient.
+                  // Bypass labels still apply — maintainer can reopen manually.
+                  core.warning(
+                    `Could not reopen PR #${prNumber} (HTTP ${e.status ?? 'unknown'}): ${e.message}. ` +
+                    `Bypass labels were applied — a maintainer may need to reopen manually.`,
+                  );
+                }
+              }
+
+              // Add bypass-issue-check so future triggers skip enforcement
+              await ensureAndAddLabel('bypass-issue-check', '0e8a16');
+
+              // Minimize stale enforcement comment (best-effort; must not
+              // abort bypass — sync w/ reopen_on_assignment.yml & step below)
+              try {
+                const marker = '<!-- require-issue-link -->';
+                const comments = await github.paginate(
+                  github.rest.issues.listComments,
+                  { owner, repo, issue_number: prNumber, per_page: 100 },
+                );
+                const stale = comments.find(c => c.body && c.body.includes(marker));
+                if (stale) {
+                  await github.graphql(`
+                    mutation($id: ID!) {
+                      minimizeComment(input: {subjectId: $id, classifier: OUTDATED}) {
+                        minimizedComment { isMinimized }
+                      }
+                    }
+                  `, { id: stale.node_id });
+                  console.log(`Minimized stale enforcement comment ${stale.id} as outdated`);
+                }
+              } catch (e) {
+                core.warning(`Could not minimize stale comment on PR #${prNumber}: ${e.message}`);
+              }
+
+              core.setOutput('has-link', 'true');
+              core.setOutput('is-assigned', 'true');
+            }
+
+            // ── Maintainer override: removed "missing-issue-link" label ─────
+            if (action === 'unlabeled') {
+              const { isMember, login } = await senderIsOrgMember();
+              if (isMember) {
+                await applyMaintainerBypass(
+                  `Maintainer ${login} removed missing-issue-link from PR #${prNumber} — bypassing enforcement`,
+                );
+                return;
+              }
+              // Non-member removed the label — re-add it defensively and
+              // set failure outputs so downstream steps (comment, close) fire.
+              // NOTE: addLabels fires a "labeled" event, but the job-level gate
+              // only matches labeled events for "external", so no re-trigger.
+              console.log(`Non-member ${login} removed missing-issue-link — re-adding`);
+              try {
+                await ensureAndAddLabel('missing-issue-link', 'b76e79');
+              } catch (e) {
+                core.warning(
+                  `Failed to re-add missing-issue-link (HTTP ${e.status ?? 'unknown'}): ${e.message}. ` +
+                  `Downstream step will retry.`,
+                );
+              }
+              core.setOutput('has-link', 'false');
+              core.setOutput('is-assigned', 'false');
+              return;
+            }
+
+            // ── Maintainer override: reopened PR with "missing-issue-link" ──
+            const prLabels = context.payload.pull_request.labels.map(l => l.name);
+            if (action === 'reopened' && prLabels.includes('missing-issue-link')) {
+              const { isMember, login } = await senderIsOrgMember();
+              if (isMember) {
+                await applyMaintainerBypass(
+                  `Maintainer ${login} reopened PR #${prNumber} — bypassing enforcement`,
+                );
+                return;
+              }
+              console.log(`Non-member ${login} reopened PR — proceeding with check`);
+            }
+
+            // ── Fetch live labels (race guard) ──────────────────────────────
+            const { data: liveLabels } = await github.rest.issues.listLabelsOnIssue({
+              owner, repo, issue_number: prNumber,
+            });
+            const liveNames = liveLabels.map(l => l.name);
+            if (liveNames.includes('trusted-contributor') || liveNames.includes('bypass-issue-check')) {
+              console.log('PR has trusted-contributor or bypass-issue-check label — bypassing');
+              core.setOutput('has-link', 'true');
+              core.setOutput('is-assigned', 'true');
+              return;
+            }
+
+            const body = context.payload.pull_request.body || '';
+            const pattern = /(?:close[sd]?|fix(?:e[sd])?|resolve[sd]?)\s*#(\d+)/gi;
+            const matches = [...body.matchAll(pattern)];
+
+            if (matches.length === 0) {
+              console.log('No issue link found in PR body');
+              core.setOutput('has-link', 'false');
+              core.setOutput('is-assigned', 'false');
+              return;
+            }
+
+            const issues = matches.map(m => `#${m[1]}`).join(', ');
+            console.log(`Found issue link(s): ${issues}`);
+            core.setOutput('has-link', 'true');
+
+            // Check whether the PR author is assigned to at least one linked issue
+            const prAuthor = context.payload.pull_request.user.login;
+            const MAX_ISSUES = 5;
+            const allIssueNumbers = [...new Set(matches.map(m => parseInt(m[1], 10)))];
+            const issueNumbers = allIssueNumbers.slice(0, MAX_ISSUES);
+            if (allIssueNumbers.length > MAX_ISSUES) {
+              core.warning(
+                `PR references ${allIssueNumbers.length} issues — only checking the first ${MAX_ISSUES}`,
+              );
+            }
+
+            let assignedToAny = false;
+            for (const num of issueNumbers) {
+              try {
+                const { data: issue } = await github.rest.issues.get({
+                  owner, repo, issue_number: num,
+                });
+                const assignees = issue.assignees.map(a => a.login.toLowerCase());
+                if (assignees.includes(prAuthor.toLowerCase())) {
+                  console.log(`PR author "${prAuthor}" is assigned to #${num}`);
+                  assignedToAny = true;
+                  break;
+                } else {
+                  console.log(`PR author "${prAuthor}" is NOT assigned to #${num} (assignees: ${assignees.join(', ') || 'none'})`);
+                }
+              } catch (error) {
+                if (error.status === 404) {
+                  console.log(`Issue #${num} not found — skipping`);
+                } else {
+                  // Non-404 errors (rate limit, server error) must not be
+                  // silently skipped — they could cause false enforcement
+                  // (closing a legitimate PR whose assignment can't be verified).
+                  throw new Error(
+                    `Cannot verify assignee for issue #${num} (${error.status}): ${error.message}`,
+                  );
+                }
+              }
+            }
+
+            core.setOutput('is-assigned', assignedToAny ? 'true' : 'false');
+
+      - name: Add missing-issue-link label
+        if: >-
+          env.ENFORCE_ISSUE_LINK == 'true' &&
+          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.pull_request.number;
+            const labelName = 'missing-issue-link';
+
+            // Ensure the label exists (no checkout/shared helper available)
+            try {
+              await github.rest.issues.getLabel({ owner, repo, name: labelName });
+            } catch (e) {
+              if (e.status !== 404) throw e;
+              try {
+                await github.rest.issues.createLabel({
+                  owner, repo, name: labelName, color: 'b76e79',
+                });
+              } catch (createErr) {
+                if (createErr.status !== 422) throw createErr;
+              }
+            }
+
+            await github.rest.issues.addLabels({
+              owner, repo, issue_number: prNumber, labels: [labelName],
+            });
+
+      - name: Remove missing-issue-link label and reopen PR
+        if: >-
+          env.ENFORCE_ISSUE_LINK == 'true' &&
+          steps.check-link.outputs.has-link == 'true' && steps.check-link.outputs.is-assigned == 'true'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.pull_request.number;
+            try {
+              await github.rest.issues.removeLabel({
+                owner, repo, issue_number: prNumber, name: 'missing-issue-link',
+              });
+            } catch (error) {
+              if (error.status !== 404) throw error;
+            }
+
+            // Reopen if this workflow previously closed the PR. We check the
+            // event payload labels (not live labels) because we already removed
+            // missing-issue-link above; the payload still reflects pre-step state.
+            const labels = context.payload.pull_request.labels.map(l => l.name);
+            if (context.payload.pull_request.state === 'closed' && labels.includes('missing-issue-link')) {
+              await github.rest.pulls.update({
+                owner,
+                repo,
+                pull_number: prNumber,
+                state: 'open',
+              });
+              console.log(`Reopened PR #${prNumber}`);
+            }
+
+            // Minimize stale enforcement comment (best-effort;
+            // sync w/ applyMaintainerBypass above & reopen_on_assignment.yml)
+            try {
+              const marker = '<!-- require-issue-link -->';
+              const comments = await github.paginate(
+                github.rest.issues.listComments,
+                { owner, repo, issue_number: prNumber, per_page: 100 },
+              );
+              const stale = comments.find(c => c.body && c.body.includes(marker));
+              if (stale) {
+                await github.graphql(`
+                  mutation($id: ID!) {
+                    minimizeComment(input: {subjectId: $id, classifier: OUTDATED}) {
+                      minimizedComment { isMinimized }
+                    }
+                  }
+                `, { id: stale.node_id });
+                console.log(`Minimized stale enforcement comment ${stale.id} as outdated`);
+              }
+            } catch (e) {
+              core.warning(`Could not minimize stale comment on PR #${prNumber}: ${e.message}`);
+            }
+
+      - name: Post comment, close PR, and fail
+        if: >-
+          env.ENFORCE_ISSUE_LINK == 'true' &&
+          (steps.check-link.outputs.has-link != 'true' || steps.check-link.outputs.is-assigned != 'true')
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.pull_request.number;
+            const hasLink = '${{ steps.check-link.outputs.has-link }}' === 'true';
+            const isAssigned = '${{ steps.check-link.outputs.is-assigned }}' === 'true';
+            const marker = '<!-- require-issue-link -->';
+
+            let lines;
+            if (!hasLink) {
+              lines = [
+                marker,
+                '**This PR has been automatically closed** because it does not link to an approved issue.',
+                '',
+                'All external contributions must reference an approved issue or discussion. Please:',
+                '1. Find or [open an issue](https://github.com/' + owner + '/' + repo + '/issues/new/choose) describing the change',
+                '2. Wait for a maintainer to approve and assign you',
+                '3. Add `Fixes #<issue_number>`, `Closes #<issue_number>`, or `Resolves #<issue_number>` to your PR description and the PR will be reopened automatically',
+                '',
+                '*Maintainers: reopen this PR or remove the `missing-issue-link` label to bypass this check.*',
+              ];
+            } else {
+              lines = [
+                marker,
+                '**This PR has been automatically closed** because you are not assigned to the linked issue.',
+                '',
+                'External contributors must be assigned to an issue before opening a PR for it. Please:',
+                '1. Comment on the linked issue to request assignment from a maintainer',
+                '2. Once assigned, your PR will be reopened automatically',
+                '',
+                '*Maintainers: reopen this PR or remove the `missing-issue-link` label to bypass this check.*',
+              ];
+            }
+
+            const body = lines.join('\n');
+
+            // Deduplicate: check for existing comment with the marker
+            const comments = await github.paginate(
+              github.rest.issues.listComments,
+              { owner, repo, issue_number: prNumber, per_page: 100 },
+            );
+            const existing = comments.find(c => c.body && c.body.includes(marker));
+
+            if (!existing) {
+              await github.rest.issues.createComment({
+                owner,
+                repo,
+                issue_number: prNumber,
+                body,
+              });
+              console.log('Posted requirement comment');
+            } else if (existing.body !== body) {
+              await github.rest.issues.updateComment({
+                owner,
+                repo,
+                comment_id: existing.id,
+                body,
+              });
+              console.log('Updated existing comment with new message');
+            } else {
+              console.log('Comment already exists — skipping');
+            }
+
+            // Close the PR
+            if (context.payload.pull_request.state === 'open') {
+              await github.rest.pulls.update({
+                owner,
+                repo,
+                pull_number: prNumber,
+                state: 'closed',
+              });
+              console.log(`Closed PR #${prNumber}`);
+            }
+
+            // Cancel all other in-progress and queued workflow runs for this PR
+            const headSha = context.payload.pull_request.head.sha;
+            for (const status of ['in_progress', 'queued']) {
+              const runs = await github.paginate(
+                github.rest.actions.listWorkflowRunsForRepo,
+                { owner, repo, head_sha: headSha, status, per_page: 100 },
+              );
+              for (const run of runs) {
+                if (run.id === context.runId) continue;
+                try {
+                  await github.rest.actions.cancelWorkflowRun({
+                    owner, repo, run_id: run.id,
+                  });
+                  console.log(`Cancelled ${status} run ${run.id} (${run.name})`);
+                } catch (err) {
+                  console.log(`Could not cancel run ${run.id}: ${err.message}`);
+                }
+              }
+            }
+
+            const reason = !hasLink
+              ? 'PR must reference an issue using auto-close keywords (e.g., "Fixes #123").'
+              : 'PR author must be assigned to the linked issue.';
+            core.setFailed(reason);

.github/workflows/tag-external-issues.yml

@@ -0,0 +1,402 @@
+# Automatically tag issues as "external" or "internal" based on whether
+# the author is a member of the langchain-ai GitHub organization, and
+# apply contributor tier labels to external contributors based on their
+# merged PR history.
+#
+# PR labeling is handled by tag-external-prs.yml.
+# PR + issue backfill lives in the backfill job below (workflow_dispatch).
+#
+# Setup Requirements:
+# 1. Create a GitHub App with permissions:
+#    - Repository: Issues (write), Pull requests (write)
+#    - Organization: Members (read)
+# 2. Install the app on your organization and this repository
+# 3. Add these repository secrets:
+#    - ORG_MEMBERSHIP_APP_ID: Your app's ID
+#    - ORG_MEMBERSHIP_APP_PRIVATE_KEY: Your app's private key
+#
+# The GitHub App token is required to check private organization membership.
+# Without it, the workflow will fail.
+
+name: Tag External Issues
+
+on:
+  issues:
+    types: [opened]
+  workflow_dispatch:
+    inputs:
+      backfill_type:
+        description: "Backfill type (for initial run)"
+        default: "both"
+        type: choice
+        options:
+          - prs
+          - issues
+          - both
+      max_items:
+        description: "Maximum number of items to process"
+        default: "100"
+        type: string
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.issue.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  tag-external:
+    if: github.event_name == 'issues'
+    runs-on: ubuntu-latest
+    permissions:
+      issues: write
+
+    steps:
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Check if contributor is external
+        if: steps.app-token.outcome == 'success'
+        id: check-membership
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const author = context.payload.sender.login;
+            const senderType = context.payload.sender.type;
+
+            if (senderType === 'Bot') {
+              console.log(`${author} is a Bot — treating as internal`);
+              core.setOutput('is-external', 'false');
+              return;
+            }
+
+            try {
+              const membership = await github.rest.orgs.getMembershipForUser({
+                org: 'langchain-ai',
+                username: author,
+              });
+              const isExternal = membership.data.state !== 'active';
+              console.log(
+                isExternal
+                  ? `${author} has pending membership — treating as external`
+                  : `${author} is an active member of langchain-ai`,
+              );
+              core.setOutput('is-external', isExternal ? 'true' : 'false');
+            } catch (e) {
+              if (e.status === 404) {
+                console.log(`${author} is not a member of langchain-ai`);
+                core.setOutput('is-external', 'true');
+              } else {
+                throw new Error(
+                  `Membership check failed for ${author} (${e.status}): ${e.message}`,
+                );
+              }
+            }
+
+      - name: Apply contributor tier label
+        if: steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue = context.payload.issue;
+            const author = issue.user.login;
+            const issueNumber = issue.number;
+
+            const TRUSTED_THRESHOLD = 5;
+            const LABEL_COLOR = 'b76e79';
+
+            let mergedCount;
+            try {
+              const result = await github.rest.search.issuesAndPullRequests({
+                q: `repo:${owner}/${repo} is:pr is:merged author:"${author}"`,
+                per_page: 1,
+              });
+              mergedCount = result?.data?.total_count;
+            } catch (error) {
+              if (error?.status !== 422) throw error;
+              core.warning(`Search failed for ${author}; skipping tier label.`);
+              return;
+            }
+
+            if (mergedCount == null) {
+              core.warning(`Search response missing total_count for ${author}; skipping tier label.`);
+              return;
+            }
+
+            const tierLabel = mergedCount >= TRUSTED_THRESHOLD ? 'trusted-contributor' : null;
+
+            if (tierLabel) {
+              try {
+                await github.rest.issues.getLabel({ owner, repo, name: tierLabel });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+                try {
+                  await github.rest.issues.createLabel({ owner, repo, name: tierLabel, color: LABEL_COLOR });
+                } catch (createErr) {
+                  if (createErr.status !== 422) throw createErr;
+                }
+              }
+              await github.rest.issues.addLabels({
+                owner, repo, issue_number: issueNumber, labels: [tierLabel],
+              });
+              console.log(`Applied '${tierLabel}' to #${issueNumber} (${mergedCount} merged PRs)`);
+            } else {
+              console.log(`No tier label for ${author} (${mergedCount} merged PRs)`);
+            }
+
+      - name: Add external label
+        if: steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.issue.number;
+            await github.rest.issues.addLabels({
+              owner, repo, issue_number, labels: ['external'],
+            });
+            console.log(`Added 'external' label to issue #${issue_number}`);
+
+      - name: Add internal label
+        if: steps.check-membership.outputs.is-external == 'false'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.issue.number;
+            await github.rest.issues.addLabels({
+              owner, repo, issue_number, labels: ['internal'],
+            });
+            console.log(`Added 'internal' label to issue #${issue_number}`);
+
+  backfill:
+    if: github.event_name == 'workflow_dispatch'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      issues: write
+      pull-requests: write
+
+    steps:
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Backfill labels
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const rawMax = '${{ inputs.max_items }}';
+            const maxItems = parseInt(rawMax, 10);
+            if (isNaN(maxItems) || maxItems <= 0) {
+              core.setFailed(`Invalid max_items: "${rawMax}" — must be a positive integer`);
+              return;
+            }
+            const backfillType = '${{ inputs.backfill_type }}';
+
+            const TRUSTED_THRESHOLD = 5;
+            const LABEL_COLOR = 'b76e79';
+
+            const tierLabels = ['trusted-contributor'];
+
+            // ── Helpers ─────────────────────────────────────────────────
+
+            async function ensureLabel(name) {
+              try {
+                await github.rest.issues.getLabel({ owner, repo, name });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+                try {
+                  await github.rest.issues.createLabel({ owner, repo, name, color: LABEL_COLOR });
+                } catch (createErr) {
+                  if (createErr.status !== 422) throw createErr;
+                }
+              }
+            }
+
+            async function checkMembership(author, userType) {
+              if (userType === 'Bot') {
+                console.log(`${author} is a Bot — treating as internal`);
+                return { isExternal: false };
+              }
+              try {
+                const membership = await github.rest.orgs.getMembershipForUser({
+                  org: 'langchain-ai',
+                  username: author,
+                });
+                const isExternal = membership.data.state !== 'active';
+                console.log(
+                  isExternal
+                    ? `${author} has pending membership — treating as external`
+                    : `${author} is an active member of langchain-ai`,
+                );
+                return { isExternal };
+              } catch (e) {
+                if (e.status === 404) {
+                  console.log(`${author} is not a member of langchain-ai`);
+                  return { isExternal: true };
+                }
+                throw new Error(
+                  `Membership check failed for ${author} (${e.status}): ${e.message}`,
+                );
+              }
+            }
+
+            async function getContributorInfo(contributorCache, author, userType) {
+              if (contributorCache.has(author)) return contributorCache.get(author);
+
+              const { isExternal } = await checkMembership(author, userType);
+
+              let mergedCount = null;
+              if (isExternal) {
+                try {
+                  const result = await github.rest.search.issuesAndPullRequests({
+                    q: `repo:${owner}/${repo} is:pr is:merged author:"${author}"`,
+                    per_page: 1,
+                  });
+                  mergedCount = result?.data?.total_count ?? null;
+                } catch (e) {
+                  if (e?.status !== 422) throw e;
+                  core.warning(`Search failed for ${author}; skipping tier.`);
+                }
+              }
+
+              const info = { isExternal, mergedCount };
+              contributorCache.set(author, info);
+              return info;
+            }
+
+            // ── Setup ────────────────────────────────────────────────────
+
+            for (const name of tierLabels) {
+              await ensureLabel(name);
+            }
+
+            const contributorCache = new Map();
+
+            let processed = 0;
+            let failures = 0;
+
+            // ── Backfill PRs ─────────────────────────────────────────────
+
+            if (backfillType === 'prs' || backfillType === 'both') {
+              const prs = await github.paginate(github.rest.pulls.list, {
+                owner, repo, state: 'open', per_page: 100,
+              });
+
+              for (const pr of prs) {
+                if (processed >= maxItems) break;
+
+                try {
+                  const author = pr.user.login;
+                  const info = await getContributorInfo(contributorCache, author, pr.user.type);
+
+                  const labels = [info.isExternal ? 'external' : 'internal'];
+                  if (info.isExternal && info.mergedCount != null && info.mergedCount >= TRUSTED_THRESHOLD) {
+                    labels.push('trusted-contributor');
+                  }
+
+                  // Ensure all labels exist before batch add
+                  for (const name of labels) {
+                    await ensureLabel(name);
+                  }
+
+                  // Remove stale tier labels
+                  const currentLabels = (await github.paginate(
+                    github.rest.issues.listLabelsOnIssue,
+                    { owner, repo, issue_number: pr.number, per_page: 100 },
+                  )).map(l => l.name ?? '');
+                  for (const name of currentLabels) {
+                    if (tierLabels.includes(name) && !labels.includes(name)) {
+                      try {
+                        await github.rest.issues.removeLabel({
+                          owner, repo, issue_number: pr.number, name,
+                        });
+                      } catch (e) {
+                        if (e.status !== 404) throw e;
+                      }
+                    }
+                  }
+
+                  await github.rest.issues.addLabels({
+                    owner, repo, issue_number: pr.number, labels,
+                  });
+                  console.log(`PR #${pr.number} (${author}): ${labels.join(', ')}`);
+                  processed++;
+                } catch (e) {
+                  failures++;
+                  core.warning(`Failed to process PR #${pr.number}: ${e.message}`);
+                }
+              }
+            }
+
+            // ── Backfill issues ──────────────────────────────────────────
+
+            if (backfillType === 'issues' || backfillType === 'both') {
+              const issues = await github.paginate(github.rest.issues.listForRepo, {
+                owner, repo, state: 'open', per_page: 100,
+              });
+
+              for (const issue of issues) {
+                if (processed >= maxItems) break;
+                if (issue.pull_request) continue;
+
+                try {
+                  const author = issue.user.login;
+                  const info = await getContributorInfo(contributorCache, author, issue.user.type);
+
+                  const labels = [info.isExternal ? 'external' : 'internal'];
+                  if (info.isExternal && info.mergedCount != null && info.mergedCount >= TRUSTED_THRESHOLD) {
+                    labels.push('trusted-contributor');
+                  }
+
+                  // Ensure all labels exist before batch add
+                  for (const name of labels) {
+                    await ensureLabel(name);
+                  }
+
+                  // Remove stale tier labels
+                  const currentLabels = (await github.paginate(
+                    github.rest.issues.listLabelsOnIssue,
+                    { owner, repo, issue_number: issue.number, per_page: 100 },
+                  )).map(l => l.name ?? '');
+                  for (const name of currentLabels) {
+                    if (tierLabels.includes(name) && !labels.includes(name)) {
+                      try {
+                        await github.rest.issues.removeLabel({
+                          owner, repo, issue_number: issue.number, name,
+                        });
+                      } catch (e) {
+                        if (e.status !== 404) throw e;
+                      }
+                    }
+                  }
+
+                  await github.rest.issues.addLabels({
+                    owner, repo, issue_number: issue.number, labels,
+                  });
+                  console.log(`Issue #${issue.number} (${author}): ${labels.join(', ')}`);
+                  processed++;
+                } catch (e) {
+                  failures++;
+                  core.warning(`Failed to process issue #${issue.number}: ${e.message}`);
+                }
+              }
+            }
+
+            console.log(`\nBackfill complete. Processed ${processed} items, ${failures} failures. ${contributorCache.size} unique authors.`);

.github/workflows/tag-external-prs.yml

@@ -0,0 +1,173 @@
+# Automatically tag pull requests as "external" or "internal" based on
+# whether the author is a member of the langchain-ai GitHub organization,
+# and apply contributor tier labels to external contributors based on
+# their merged PR history.
+#
+# Issue labeling is handled by tag-external-issues.yml.
+# Backfill (workflow_dispatch) also lives in tag-external-issues.yml.
+#
+# Setup Requirements:
+# 1. Create a GitHub App with permissions:
+#    - Repository: Pull requests (write)
+#    - Organization: Members (read)
+# 2. Install the app on your organization and this repository
+# 3. Add these repository secrets:
+#    - ORG_MEMBERSHIP_APP_ID: Your app's ID
+#    - ORG_MEMBERSHIP_APP_PRIVATE_KEY: Your app's private key
+#
+# The GitHub App token is required to check private organization membership.
+# Without it, the workflow will fail.
+
+name: Tag External PRs
+
+on:
+  pull_request_target:
+    types: [opened]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  tag-external:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+
+    steps:
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@bcd2ba49218906704ab6c1aa796996da409d3eb1 # v3.2.0
+        with:
+          app-id: ${{ secrets.ORG_MEMBERSHIP_APP_ID }}
+          private-key: ${{ secrets.ORG_MEMBERSHIP_APP_PRIVATE_KEY }}
+
+      - name: Check if contributor is external
+        if: steps.app-token.outcome == 'success'
+        id: check-membership
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const author = context.payload.sender.login;
+            const senderType = context.payload.sender.type;
+
+            if (senderType === 'Bot') {
+              console.log(`${author} is a Bot — treating as internal`);
+              core.setOutput('is-external', 'false');
+              return;
+            }
+
+            try {
+              const membership = await github.rest.orgs.getMembershipForUser({
+                org: 'langchain-ai',
+                username: author,
+              });
+              const isExternal = membership.data.state !== 'active';
+              console.log(
+                isExternal
+                  ? `${author} has pending membership — treating as external`
+                  : `${author} is an active member of langchain-ai`,
+              );
+              core.setOutput('is-external', isExternal ? 'true' : 'false');
+            } catch (e) {
+              if (e.status === 404) {
+                console.log(`${author} is not a member of langchain-ai`);
+                core.setOutput('is-external', 'true');
+              } else {
+                throw new Error(
+                  `Membership check failed for ${author} (${e.status}): ${e.message}`,
+                );
+              }
+            }
+
+      # Apply tier label BEFORE the external label so that
+      # "trusted-contributor" is already present when the "external" labeled
+      # event fires and triggers require_issue_link.yml.
+      - name: Apply contributor tier label
+        if: steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          # Use App token so the "labeled" event propagates to downstream
+          # workflows (e.g. require_issue_link.yml).
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const pr = context.payload.pull_request;
+            const author = pr.user.login;
+            const prNumber = pr.number;
+
+            const TRUSTED_THRESHOLD = 5;
+            const LABEL_COLOR = 'b76e79';
+
+            let mergedCount;
+            try {
+              const result = await github.rest.search.issuesAndPullRequests({
+                q: `repo:${owner}/${repo} is:pr is:merged author:"${author}"`,
+                per_page: 1,
+              });
+              mergedCount = result?.data?.total_count;
+            } catch (error) {
+              if (error?.status !== 422) throw error;
+              core.warning(`Search failed for ${author}; skipping tier label.`);
+              return;
+            }
+
+            if (mergedCount == null) {
+              core.warning(`Search response missing total_count for ${author}; skipping tier label.`);
+              return;
+            }
+
+            const tierLabel = mergedCount >= TRUSTED_THRESHOLD ? 'trusted-contributor' : null;
+
+            if (tierLabel) {
+              try {
+                await github.rest.issues.getLabel({ owner, repo, name: tierLabel });
+              } catch (e) {
+                if (e.status !== 404) throw e;
+                try {
+                  await github.rest.issues.createLabel({ owner, repo, name: tierLabel, color: LABEL_COLOR });
+                } catch (createErr) {
+                  if (createErr.status !== 422) throw createErr;
+                }
+              }
+              await github.rest.issues.addLabels({
+                owner, repo, issue_number: prNumber, labels: [tierLabel],
+              });
+              console.log(`Applied '${tierLabel}' to PR #${prNumber} (${mergedCount} merged PRs)`);
+            } else {
+              console.log(`No tier label for ${author} (${mergedCount} merged PRs)`);
+            }
+
+      - name: Add external label
+        if: steps.check-membership.outputs.is-external == 'true'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          # Use App token so the "labeled" event propagates to downstream
+          # workflows (e.g. require_issue_link.yml). Events created by the
+          # default GITHUB_TOKEN do not trigger additional workflow runs.
+          github-token: ${{ steps.app-token.outputs.token }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.pull_request.number;
+            await github.rest.issues.addLabels({
+              owner, repo, issue_number, labels: ['external'],
+            });
+            console.log(`Added 'external' label to PR #${issue_number}`);
+
+      - name: Add internal label
+        if: steps.check-membership.outputs.is-external == 'false'
+        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}
+          script: |
+            const { owner, repo } = context.repo;
+            const issue_number = context.payload.pull_request.number;
+            await github.rest.issues.addLabels({
+              owner, repo, issue_number, labels: ['internal'],
+            });
+            console.log(`Added 'internal' label to PR #${issue_number}`);

.github/workflows/uv_lock_ugprade.yml

@@ -16,21 +16,19 @@ jobs:
     runs-on: ubuntu-latest
     
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       
       - name: Set up uv
-        uses: astral-sh/setup-uv@v7
+        uses: ./.github/actions/uv_setup
         with:
-          # use minimum supported Python version
           python-version: "3.10"
-          enable-cache: true
           cache-suffix: "uv-lock-upgrade"
           
       - name: Run uv lock --upgrade in all Python packages
         run: make lock-upgrade
           
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v8
+        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: "chore(deps): upgrade dependencies with `uv lock --upgrade`"

.gitignore

@@ -100,3 +100,4 @@ dmypy.json
 .turbo
 .editorconfig
 .scratch
+.worktrees/

.markdownlint.json

@@ -0,0 +1,14 @@
+{
+  "MD013": false,
+  "MD024": {
+    "siblings_only": true
+  },
+  "MD025": false,
+  "MD033": false,
+  "MD034": false,
+  "MD036": false,
+  "MD041": false,
+  "MD046": {
+    "style": "fenced"
+  }
+}

README.md

@@ -1,93 +1,81 @@
-<picture class="github-only">
-  <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-light.svg">
-  <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-dark.svg">
-  <img alt="LangGraph Logo" src=".github/images/logo-dark.svg" width="50%">
-</picture>
-
-<div>
-<br>
+<div align="center">
+  <a href="https://www.langchain.com/langgraph">
+    <picture>
+      <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-dark.svg">
+      <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-light.svg">
+      <img alt="LangGraph Logo" src=".github/images/logo-dark.svg" width="50%">
+    </picture>
+  </a>
 </div>
 
-[![Version](https://img.shields.io/pypi/v/langgraph.svg)](https://pypi.org/project/langgraph/)
-[![Downloads](https://static.pepy.tech/badge/langgraph/month)](https://pepy.tech/project/langgraph)
-[![Open Issues](https://img.shields.io/github/issues-raw/langchain-ai/langgraph)](https://github.com/langchain-ai/langgraph/issues)
-[![Docs](https://img.shields.io/badge/docs-latest-blue)](https://docs.langchain.com/oss/python/langgraph/overview)
+<div align="center">
+  <h3>Low-level orchestration framework for building stateful agents.</h3>
+</div>
+
+<div align="center">
+  <a href="https://opensource.org/licenses/MIT" target="_blank"><img src="https://img.shields.io/pypi/l/langgraph" alt="PyPI - License"></a>
+  <a href="https://pypistats.org/packages/langgraph" target="_blank"><img src="https://img.shields.io/pepy/dt/langgraph" alt="PyPI - Downloads"></a>
+  <a href="https://pypi.org/project/langgraph/" target="_blank"><img src="https://img.shields.io/pypi/v/langgraph.svg?label=%20" alt="Version"></a>
+  <a href="https://x.com/langchain_oss" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
+</div>
+
+<br>
 
 Trusted by companies shaping the future of agents – including Klarna, Replit, Elastic, and more – LangGraph is a low-level orchestration framework for building, managing, and deploying long-running, stateful agents.
 
-## Get started
-
-Install LangGraph:
-
-```
+```bash
 pip install -U langgraph
 ```
 
-Create a simple workflow:
+> [!TIP]
+> If you're looking to quickly build agents, check out **[Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview)** — a higher-level package built on LangGraph for agents that can plan, use subagents, and leverage file systems for complex tasks.
 
-```python
-from langgraph.graph import START, StateGraph
-from typing_extensions import TypedDict
+For an equivalent JS/TS library, check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
 
+## Why use LangGraph?
 
-class State(TypedDict):
-    text: str
+LangGraph provides low-level supporting infrastructure for *any* long-running, stateful workflow or agent:
 
-
-def node_a(state: State) -> dict:
-    return {"text": state["text"] + "a"}
-
-
-def node_b(state: State) -> dict:
-    return {"text": state["text"] + "b"}
-
-
-graph = StateGraph(State)
-graph.add_node("node_a", node_a)
-graph.add_node("node_b", node_b)
-graph.add_edge(START, "node_a")
-graph.add_edge("node_a", "node_b")
-
-print(graph.compile().invoke({"text": ""}))
-# {'text': 'ab'}
-```
-
-Get started with the [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart).
-
-To quickly build agents with LangChain's `create_agent` (built on LangGraph), see the [LangChain Agents documentation](https://docs.langchain.com/oss/python/langchain/agents).
+- **[Durable execution](https://docs.langchain.com/oss/python/langgraph/durable-execution)** — Build agents that persist through failures and can run for extended periods, automatically resuming from exactly where they left off.
+- **[Human-in-the-loop](https://docs.langchain.com/oss/python/langgraph/interrupts)** — Seamlessly incorporate human oversight by inspecting and modifying agent state at any point during execution.
+- **[Comprehensive memory](https://docs.langchain.com/oss/python/langgraph/memory)** — Create truly stateful agents with both short-term working memory for ongoing reasoning and long-term persistent memory across sessions.
+- **[Debugging with LangSmith](https://www.langchain.com/langsmith)** — Gain deep visibility into complex agent behavior with visualization tools that trace execution paths, capture state transitions, and provide detailed runtime metrics.
+- **[Production-ready deployment](https://docs.langchain.com/langsmith/deployments)** — Deploy sophisticated agent systems confidently with scalable infrastructure designed to handle the unique challenges of stateful, long-running workflows.
 
 > [!TIP]
 > For developing, debugging, and deploying AI agents and LLM applications, see [LangSmith](https://docs.langchain.com/langsmith/home).
 
-## Core benefits
+## LangGraph ecosystem
 
-LangGraph provides low-level supporting infrastructure for *any* long-running, stateful workflow or agent. LangGraph does not abstract prompts or architecture, and provides the following central benefits:
+While LangGraph can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools for building agents.
 
-- [Durable execution](https://docs.langchain.com/oss/python/langgraph/durable-execution): Build agents that persist through failures and can run for extended periods, automatically resuming from exactly where they left off.
-- [Human-in-the-loop](https://docs.langchain.com/oss/python/langgraph/interrupts): Seamlessly incorporate human oversight by inspecting and modifying agent state at any point during execution.
-- [Comprehensive memory](https://docs.langchain.com/oss/python/langgraph/memory): Create truly stateful agents with both short-term working memory for ongoing reasoning and long-term persistent memory across sessions.
-- [Debugging with LangSmith](http://www.langchain.com/langsmith): Gain deep visibility into complex agent behavior with visualization tools that trace execution paths, capture state transitions, and provide detailed runtime metrics.
-- [Production-ready deployment](https://docs.langchain.com/langsmith/app-development): Deploy sophisticated agent systems confidently with scalable infrastructure designed to handle the unique challenges of stateful, long-running workflows.
+To improve your LLM application development, pair LangGraph with:
 
-## LangGraph’s ecosystem
-
-While LangGraph can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools for building agents. To improve your LLM application development, pair LangGraph with:
-
-- [LangSmith](http://www.langchain.com/langsmith) — Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
-- [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) — Deploy and scale agents effortlessly with a purpose-built deployment platform for long running, stateful workflows. Discover, reuse, configure, and share agents across teams — and iterate quickly with visual prototyping in [LangGraph Studio](https://docs.langchain.com/oss/python/langgraph/studio).
+- [Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview) – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
 - [LangChain](https://docs.langchain.com/oss/python/langchain/overview) – Provides integrations and composable components to streamline LLM application development.
+- [LangSmith](https://www.langchain.com/langsmith) – Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
+- [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) – Deploy and scale agents effortlessly with a purpose-built deployment platform for long-running, stateful workflows. Discover, reuse, configure, and share agents across teams – and iterate quickly with visual prototyping in [LangSmith Studio](https://docs.langchain.com/langsmith/studio).
 
-> [!NOTE]
-> Looking for the JS version of LangGraph? See the [JS repo](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
+---
+
+## Documentation
+
+- [docs.langchain.com](https://docs.langchain.com/oss/python/langgraph/overview) – Comprehensive documentation, including conceptual overviews and guides
+- [reference.langchain.com/python/langgraph](https://reference.langchain.com/python/langgraph) – API reference docs for LangGraph packages
+- [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart) – Get started building with LangGraph
+- [Chat LangChain](https://chat.langchain.com/) – Chat with the LangChain documentation and get answers to your questions
+
+**Discussions**: Visit the [LangChain Forum](https://forum.langchain.com) to connect with the community and share all of your technical questions, ideas, and feedback.
 
 ## Additional resources
 
-- [Guides](https://docs.langchain.com/oss/python/langgraph/overview): Quick, actionable code snippets for topics such as streaming, adding memory & persistence, and design patterns (e.g. branching, subgraphs, etc.).
-- [Reference](https://reference.langchain.com/python/langgraph/): Detailed reference on core classes, methods, how to use the graph and checkpointing APIs, and higher-level prebuilt components.
-- [Examples](https://docs.langchain.com/oss/python/langgraph/agentic-rag): Guided examples on getting started with LangGraph.
-- [LangChain Forum](https://forum.langchain.com/): Connect with the community and share all of your technical questions, ideas, and feedback.
-- [LangChain Academy](https://academy.langchain.com/courses/intro-to-langgraph): Learn the basics of LangGraph in our free, structured course.
-- [Case studies](https://www.langchain.com/built-with-langgraph): Hear how industry leaders use LangGraph to ship AI applications at scale.
+- **[Guides](https://docs.langchain.com/oss/python/learn)** – Quick, actionable code snippets for topics such as streaming, adding memory & persistence, and design patterns (e.g. branching, subgraphs, etc.).
+- **[LangChain Academy](https://academy.langchain.com/courses/intro-to-langgraph)** – Learn the basics of LangGraph in our free, structured course.
+- **[Case studies](https://www.langchain.com/built-with-langgraph)** – Hear how industry leaders use LangGraph to ship AI applications at scale.
+- [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview) – Learn how to contribute to LangChain projects and find good first issues.
+- [Code of Conduct](https://github.com/langchain-ai/langchain/?tab=coc-ov-file) – Our community guidelines and standards for participation.
+
+---
 
 ## Acknowledgements
 

examples/README.md

@@ -1,3 +1,11 @@
 # LangGraph examples
 
-This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview). Please refer to the LangChain docs for the most up-to-date examples and usage guidelines for LangGraph.
+This directory is retained purely for archival purposes and is no longer updated.
+
+## 🤔 What is this?
+
+The examples previously found here have been moved to the consolidated LangChain documentation. This directory remains available for historical reference, but new examples and usage guidance are published in the docs.
+
+## 📖 Documentation
+
+For up-to-date LangGraph examples, tutorials, and guides, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview). Get started with the [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart).

examples/delta-channel-dump/README.md

@@ -0,0 +1,132 @@
+# delta-channel-dump
+
+Recover messages (and other channels) from a Postgres-backed LangGraph thread
+written by **langgraph >= 1.2** (DeltaChannel format) — including **LangGraph
+Server / langgraph-api** deployments on the Postgres runtime, **deepagents
+0.6.x**, or any OSS app using `PostgresSaver` — before rolling back to an older
+runtime such as **deepagents 0.5.x / langgraph < 1.2**.
+
+langgraph-api uses the same `checkpoints` / `checkpoint_blobs` / `checkpoint_writes`
+schema as OSS `checkpoint-postgres`; this script reads those tables directly.
+
+On the older runtime, `add_messages` does not understand the `EXT_DELTA_SNAPSHOT`
+msgpack ext code and silently returns an empty list for affected channels. This
+tool reads the raw checkpoint blobs from Postgres and emits JSON you can inspect
+and re-apply via `update_state` (LangGraph Server SDK) or `graph.update_state`
+(OSS).
+
+## Install
+
+```bash
+pip install "psycopg[binary]" ormsgpack
+```
+
+## Run
+
+```bash
+export DATABASE_URI=postgres://user:pass@host:5432/dbname
+python3 dump.py \
+    --thread-id <uuid> \
+    --channel messages \
+    [--channel files ...] \
+    [--checkpoint-id <uuid>] \
+    [--checkpoint-ns ""] \
+    --output recovery.json
+```
+
+- `--thread-id` (required): thread UUID
+- `--channel` (required, repeatable): channel names to recover
+- `--checkpoint-id` (optional): target checkpoint; defaults to latest
+- `--checkpoint-ns` (optional): namespace; defaults to `""`
+- `--database-uri` (optional): Postgres URI; defaults to `DATABASE_URI` env var
+- `--output` (optional): output file; defaults to stdout
+
+## Output
+
+```json
+{
+  "thread_id": "...",
+  "checkpoint_ns": "",
+  "target_checkpoint_id": "...",
+  "parent_checkpoint_id": "...",
+  "channels": {
+    "messages": {
+      "delta_kind": "snapshot",
+      "seed_checkpoint_id": "...",
+      "seed_version": "...",
+      "seed": [{ "type": "ai", "content": "...", "id": "ai-0" }],
+      "writes": [
+        {
+          "checkpoint_id": "...",
+          "task_id": "...",
+          "idx": 0,
+          "value": [{ "type": "ai", "content": "...", "id": "ai-10" }]
+        }
+      ]
+    }
+  }
+}
+```
+
+`delta_kind` is one of:
+
+- `snapshot` — DeltaChannel snapshot blob (`channel_values[ch] == true`)
+- `legacy_plain` — pre-DeltaChannel inline or blob value
+- `no_seed` — walked to root without finding a populated ancestor
+
+`writes` are ordered oldest-to-newest (the order a reducer would replay them).
+
+## Reducing back to a single list
+
+For deepagents-style messages, combine seed and writes, then deduplicate:
+
+```python
+import json
+
+data = json.load(open("recovery.json"))
+ch = data["channels"]["messages"]
+messages = list(ch["seed"] or [])
+for w in ch["writes"]:
+    messages.extend(w["value"] or [])
+
+# Dedup by id, keep last; drop RemoveMessage tombstones
+by_id = {}
+for m in messages:
+    if isinstance(m, dict) and m.get("type") == "remove":
+        by_id.pop(m.get("id"), None)
+    elif isinstance(m, dict) and m.get("id"):
+        by_id[m["id"]] = m
+    else:
+        by_id[id(m)] = m
+reduced = list(by_id.values())
+```
+
+This approximates `_messages_delta_reducer` semantics; adjust for your graph.
+
+## Re-applying
+
+```python
+from langgraph_sdk import get_client
+
+client = get_client(url="http://localhost:8123")
+await client.threads.update_state(
+    thread_id,
+    values={"messages": reduced},
+)
+```
+
+Review the recovered JSON before calling `update_state`. This tool is
+read-only and intentionally does not mutate the database.
+
+## Scope / non-goals (v1)
+
+- **Postgres only** — OSS `PostgresSaver` or langgraph-api Postgres runtime; not
+  inmem, gRPC core, Mongo, or Redis checkpointer backends
+- **No AES decryption** (`LANGGRAPH_AES_KEY`) or custom encryption
+- **No reducer** — raw seed + writes only
+- **No automatic `update_state`** — operator applies manually
+
+## Copying
+
+`dump.py` is self-contained. Copy it anywhere; only `psycopg[binary]` and
+`ormsgpack` are required at runtime. No langgraph imports.

examples/delta-channel-dump/dump.py

@@ -0,0 +1,469 @@
+#!/usr/bin/env python3
+"""Recover delta-channel state from a Postgres-backed LangGraph thread.
+
+Works with OSS ``PostgresSaver`` and LangGraph Server / langgraph-api on the
+Postgres runtime (same checkpoint schema). Use after rolling back from
+langgraph >= 1.2 / deepagents 0.6.x to an older runtime that does not
+understand ``EXT_DELTA_SNAPSHOT`` msgpack blobs. The script walks the checkpoint
+parent chain, decodes msgpack blobs, and emits a JSON dump of per-channel
+``seed`` plus oldest-to-newest ``writes``. Apply the recovered values manually
+via ``client.threads.update_state(...)`` (Server) or ``graph.update_state``
+(OSS).
+
+Install::
+
+    pip install "psycopg[binary]" ormsgpack
+
+Run::
+
+    export DATABASE_URI=postgres://...
+    python3 dump.py --thread-id <uuid> --channel messages --output recovery.json
+
+Scope (v1): Postgres only; no AES/custom encryption; no reducer application.
+"""
+
+from __future__ import annotations
+
+import argparse
+import base64
+import json
+import os
+import sys
+import uuid
+from typing import Any
+
+import ormsgpack
+import psycopg
+
+# LangGraph msgpack EXT type codes (langgraph/checkpoint/serde/jsonplus.py).
+EXT_CONSTRUCTOR_SINGLE_ARG = 0
+EXT_CONSTRUCTOR_POS_ARGS = 1
+EXT_CONSTRUCTOR_KW_ARGS = 2
+EXT_METHOD_SINGLE_ARG = 3
+EXT_PYDANTIC_V1 = 4
+EXT_PYDANTIC_V2 = 5
+EXT_NUMPY_ARRAY = 6
+EXT_DELTA_SNAPSHOT = 7
+
+_MSGPACK_OPTION = ormsgpack.OPT_NON_STR_KEYS
+
+
+def ext_hook(code: int, data: bytes) -> Any:
+    """Decode LangGraph msgpack EXT payloads to JSON-friendly Python values."""
+    if code == EXT_DELTA_SNAPSHOT:
+        inner = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
+        return {"__delta_snapshot__": inner}
+    if code == EXT_CONSTRUCTOR_SINGLE_ARG:
+        try:
+            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
+            if tup[0] == "uuid" and tup[1] == "UUID":
+                hex_ = tup[2]
+                return (
+                    f"{hex_[:8]}-{hex_[8:12]}-{hex_[12:16]}-"
+                    f"{hex_[16:20]}-{hex_[20:]}"
+                )
+            return tup[2]
+        except Exception:
+            return None
+    if code == EXT_CONSTRUCTOR_POS_ARGS:
+        try:
+            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
+            if tup[0] == "langgraph.types" and tup[1] == "Send":
+                args = tup[2]
+                if len(args) == 2:
+                    return {"__send__": {"node": args[0], "arg": args[1]}}
+                return {
+                    "__send__": {
+                        "node": args[0],
+                        "arg": args[1],
+                        "timeout": args[2],
+                    }
+                }
+            return tup[2]
+        except Exception:
+            return None
+    if code in (EXT_CONSTRUCTOR_KW_ARGS, EXT_METHOD_SINGLE_ARG):
+        try:
+            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
+            return tup[2]
+        except Exception:
+            return None
+    if code in (EXT_PYDANTIC_V1, EXT_PYDANTIC_V2):
+        try:
+            tup = ormsgpack.unpackb(data, ext_hook=ext_hook, option=_MSGPACK_OPTION)
+            return tup[2]
+        except Exception:
+            return None
+    if code == EXT_NUMPY_ARRAY:
+        try:
+            dtype_str, shape, order, buf = ormsgpack.unpackb(
+                data, ext_hook=ext_hook, option=_MSGPACK_OPTION
+            )
+            return {
+                "__numpy_array__": {
+                    "dtype": dtype_str,
+                    "shape": shape,
+                    "order": order,
+                    "data_b64": base64.b64encode(buf).decode("ascii"),
+                }
+            }
+        except Exception:
+            return None
+    return None
+
+
+def decode_blob(blob_type: str, blob_bytes: bytes | None) -> Any:
+    if blob_type in ("empty", "null") or blob_bytes is None:
+        return None
+    if blob_type == "msgpack":
+        return ormsgpack.unpackb(
+            blob_bytes, ext_hook=ext_hook, option=_MSGPACK_OPTION
+        )
+    if blob_type in ("bytes", "bytearray"):
+        return base64.b64encode(blob_bytes).decode("ascii")
+    raise RuntimeError(
+        f"Unknown blob type {blob_type!r}. "
+        "AES/custom-encrypted deployments are out of scope for v1."
+    )
+
+
+def delta_unwrap(value: Any) -> Any:
+    if isinstance(value, dict) and "__delta_snapshot__" in value:
+        return value["__delta_snapshot__"]
+    return value
+
+
+def json_default(obj: Any) -> Any:
+    if isinstance(obj, (bytes, bytearray)):
+        return base64.b64encode(bytes(obj)).decode("ascii")
+    if isinstance(obj, uuid.UUID):
+        return str(obj)
+    raise TypeError(f"Object of type {type(obj).__name__} is not JSON serializable")
+
+
+def resolve_target_checkpoint_id(
+    conn: psycopg.Connection[Any],
+    thread_id: str,
+    checkpoint_ns: str,
+    checkpoint_id: str | None,
+) -> str:
+    if checkpoint_id is not None:
+        return checkpoint_id
+    row = conn.execute(
+        """
+        SELECT checkpoint_id::text
+        FROM checkpoints
+        WHERE thread_id = %s AND checkpoint_ns = %s
+        ORDER BY checkpoint_id DESC
+        LIMIT 1
+        """,
+        (thread_id, checkpoint_ns),
+    ).fetchone()
+    if row is None:
+        raise SystemExit(
+            f"No checkpoints found for thread_id={thread_id!r} "
+            f"checkpoint_ns={checkpoint_ns!r}"
+        )
+    return row[0]
+
+
+def _load_checkpoint(
+    conn: psycopg.Connection[Any],
+    thread_id: str,
+    checkpoint_ns: str,
+    checkpoint_id: str,
+) -> tuple[dict[str, Any], str | None] | None:
+    row = conn.execute(
+        """
+        SELECT checkpoint, parent_checkpoint_id::text
+        FROM checkpoints
+        WHERE thread_id = %s AND checkpoint_ns = %s AND checkpoint_id = %s
+        """,
+        (thread_id, checkpoint_ns, checkpoint_id),
+    ).fetchone()
+    if row is None:
+        return None
+    return row[0], row[1]
+
+
+def _load_seed(
+    conn: psycopg.Connection[Any],
+    *,
+    thread_id: str,
+    checkpoint_ns: str,
+    channel: str,
+    checkpoint_id: str,
+    channel_values: dict[str, Any],
+    channel_versions: dict[str, str],
+) -> dict[str, Any]:
+    cv = channel_values[channel]
+    version = channel_versions.get(channel)
+    if cv is True:
+        blob_row = conn.execute(
+            """
+            SELECT type, blob
+            FROM checkpoint_blobs
+            WHERE thread_id = %s AND checkpoint_ns = %s
+              AND channel = %s AND version = %s
+            """,
+            (thread_id, checkpoint_ns, channel, version),
+        ).fetchone()
+        seed_value = None
+        if blob_row is not None and blob_row[0] != "empty":
+            seed_value = delta_unwrap(decode_blob(blob_row[0], blob_row[1]))
+        return {
+            "delta_kind": "snapshot",
+            "seed_checkpoint_id": checkpoint_id,
+            "seed_version": version,
+            "seed": seed_value,
+        }
+    if isinstance(cv, (int, float, str, bool)) or cv is None:
+        return {
+            "delta_kind": "legacy_plain",
+            "seed_checkpoint_id": checkpoint_id,
+            "seed_version": version,
+            "seed": cv,
+        }
+    blob_row = conn.execute(
+        """
+        SELECT type, blob
+        FROM checkpoint_blobs
+        WHERE thread_id = %s AND checkpoint_ns = %s
+          AND channel = %s AND version = %s
+        """,
+        (thread_id, checkpoint_ns, channel, version),
+    ).fetchone()
+    seed_value = cv if blob_row is None else decode_blob(blob_row[0], blob_row[1])
+    return {
+        "delta_kind": "legacy_plain",
+        "seed_checkpoint_id": checkpoint_id,
+        "seed_version": version,
+        "seed": seed_value,
+    }
+
+
+def _load_writes_for_checkpoint(
+    conn: psycopg.Connection[Any],
+    *,
+    thread_id: str,
+    checkpoint_ns: str,
+    checkpoint_id: str,
+    channel: str,
+) -> list[dict[str, Any]]:
+    """Load writes for one checkpoint, newest-first by ``(task_id, idx)``.
+
+    ``walk_channel`` reverses the accumulated flat list before returning;
+    DESC here yields oldest-first within each checkpoint in the final output,
+    matching ``PostgresSaver._build_delta_channels_writes_history``.
+    """
+    rows = conn.execute(
+        """
+        SELECT task_id::text, idx, type, blob
+        FROM checkpoint_writes
+        WHERE thread_id = %s AND checkpoint_ns = %s
+          AND checkpoint_id = %s AND channel = %s
+        ORDER BY task_id DESC, idx DESC
+        """,
+        (thread_id, checkpoint_ns, checkpoint_id, channel),
+    ).fetchall()
+    return [
+        {
+            "checkpoint_id": checkpoint_id,
+            "task_id": task_id,
+            "idx": idx,
+            "value": decode_blob(blob_type, blob_bytes),
+        }
+        for task_id, idx, blob_type, blob_bytes in rows
+    ]
+
+
+def walk_channel(
+    conn: psycopg.Connection[Any],
+    *,
+    thread_id: str,
+    checkpoint_ns: str,
+    start_checkpoint_id: str | None,
+    channel: str,
+) -> dict[str, Any]:
+    """Walk one channel's parent chain from target.parent backward to seed."""
+    chain_writes_newest_first: list[dict[str, Any]] = []
+    cur = start_checkpoint_id
+    while cur is not None:
+        loaded = _load_checkpoint(conn, thread_id, checkpoint_ns, cur)
+        if loaded is None:
+            break
+        checkpoint_json, parent_id = loaded
+        channel_values = checkpoint_json.get("channel_values") or {}
+        channel_versions = checkpoint_json.get("channel_versions") or {}
+
+        chain_writes_newest_first.extend(
+            _load_writes_for_checkpoint(
+                conn,
+                thread_id=thread_id,
+                checkpoint_ns=checkpoint_ns,
+                checkpoint_id=cur,
+                channel=channel,
+            )
+        )
+
+        if channel in channel_values:
+            seed = _load_seed(
+                conn,
+                thread_id=thread_id,
+                checkpoint_ns=checkpoint_ns,
+                channel=channel,
+                checkpoint_id=cur,
+                channel_values=channel_values,
+                channel_versions=channel_versions,
+            )
+            seed["writes"] = list(reversed(chain_writes_newest_first))
+            return seed
+
+        cur = parent_id
+
+    return {
+        "delta_kind": "no_seed",
+        "seed_checkpoint_id": None,
+        "seed_version": None,
+        "seed": None,
+        "writes": list(reversed(chain_writes_newest_first)),
+    }
+
+
+def walk_parent_chain(
+    conn: psycopg.Connection[Any],
+    *,
+    thread_id: str,
+    checkpoint_ns: str,
+    target_checkpoint_id: str,
+    channels: list[str],
+) -> tuple[str | None, dict[str, dict[str, Any]]]:
+    """Walk parent chain and return per-channel seed + writes (oldest-first)."""
+    parent_row = conn.execute(
+        """
+        SELECT parent_checkpoint_id::text
+        FROM checkpoints
+        WHERE thread_id = %s AND checkpoint_ns = %s AND checkpoint_id = %s
+        """,
+        (thread_id, checkpoint_ns, target_checkpoint_id),
+    ).fetchone()
+    if parent_row is None:
+        raise SystemExit(
+            f"Checkpoint {target_checkpoint_id!r} not found for thread {thread_id!r}"
+        )
+    parent_checkpoint_id = parent_row[0]
+
+    result = {
+        ch: walk_channel(
+            conn,
+            thread_id=thread_id,
+            checkpoint_ns=checkpoint_ns,
+            start_checkpoint_id=parent_checkpoint_id,
+            channel=ch,
+        )
+        for ch in channels
+    }
+    return parent_checkpoint_id, result
+
+
+def build_output(
+    *,
+    thread_id: str,
+    checkpoint_ns: str,
+    target_checkpoint_id: str,
+    parent_checkpoint_id: str | None,
+    channels: dict[str, dict[str, Any]],
+) -> dict[str, Any]:
+    return {
+        "thread_id": thread_id,
+        "checkpoint_ns": checkpoint_ns,
+        "target_checkpoint_id": target_checkpoint_id,
+        "parent_checkpoint_id": parent_checkpoint_id,
+        "channels": channels,
+    }
+
+
+def parse_args(argv: list[str] | None = None) -> argparse.Namespace:
+    parser = argparse.ArgumentParser(
+        description=(
+            "Recover delta-channel seed + writes from Postgres checkpoint data."
+        ),
+    )
+    parser.add_argument("--thread-id", required=True, help="Thread UUID")
+    parser.add_argument(
+        "--channel",
+        action="append",
+        required=True,
+        dest="channels",
+        help="Channel name (repeatable)",
+    )
+    parser.add_argument(
+        "--checkpoint-id",
+        default=None,
+        help="Target checkpoint UUID (default: latest for thread)",
+    )
+    parser.add_argument(
+        "--checkpoint-ns",
+        default="",
+        help='Checkpoint namespace (default: "")',
+    )
+    parser.add_argument(
+        "--database-uri",
+        default=os.environ.get("DATABASE_URI"),
+        help="Postgres URI (default: DATABASE_URI env var)",
+    )
+    parser.add_argument(
+        "--output",
+        default="-",
+        help="Output JSON file path (default: stdout)",
+    )
+    return parser.parse_args(argv)
+
+
+def main(argv: list[str] | None = None) -> int:
+    args = parse_args(argv)
+    if not args.database_uri:
+        print(
+            "error: --database-uri or DATABASE_URI is required",
+            file=sys.stderr,
+        )
+        return 2
+
+    thread_id = str(uuid.UUID(args.thread_id))
+    channels = list(dict.fromkeys(args.channels))
+
+    with psycopg.connect(args.database_uri) as conn:
+        target_checkpoint_id = resolve_target_checkpoint_id(
+            conn,
+            thread_id,
+            args.checkpoint_ns,
+            args.checkpoint_id,
+        )
+        parent_checkpoint_id, channel_data = walk_parent_chain(
+            conn,
+            thread_id=thread_id,
+            checkpoint_ns=args.checkpoint_ns,
+            target_checkpoint_id=target_checkpoint_id,
+            channels=channels,
+        )
+
+    output = build_output(
+        thread_id=thread_id,
+        checkpoint_ns=args.checkpoint_ns,
+        target_checkpoint_id=target_checkpoint_id,
+        parent_checkpoint_id=parent_checkpoint_id,
+        channels=channel_data,
+    )
+    payload = json.dumps(output, indent=2, default=json_default)
+
+    if args.output == "-":
+        print(payload)
+    else:
+        with open(args.output, "w", encoding="utf-8") as f:
+            f.write(payload)
+            f.write("\n")
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

libs/checkpoint-conformance/README.md

@@ -1,15 +1,27 @@
-# langgraph-checkpoint-conformance
+# LangGraph Checkpoint Conformance
 
-Conformance test suite for [LangGraph](https://github.com/langchain-ai/langgraph) checkpointer implementations.
+[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint-conformance?label=%20)](https://pypi.org/project/langgraph-checkpoint-conformance/#history)
+[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint-conformance)](https://opensource.org/licenses/MIT)
+[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint-conformance)](https://pypistats.org/packages/langgraph-checkpoint-conformance)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
 
-Validates that a `BaseCheckpointSaver` subclass correctly implements the checkpoint storage contract — blob round-trips, metadata preservation, namespace isolation, incremental channel updates, and more.
+To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
+[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
 
-## Installation
+## Quick Install
 
 ```bash
-pip install langgraph-checkpoint-conformance
+uv add langgraph-checkpoint-conformance
 ```
 
+## 🤔 What is this?
+
+This library provides a conformance test suite for [LangGraph](https://github.com/langchain-ai/langgraph) checkpointer implementations. It validates that a `BaseCheckpointSaver` subclass correctly implements the checkpoint storage contract — blob round-trips, metadata preservation, namespace isolation, incremental channel updates, and more.
+
+## 📖 Documentation
+
+For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph/). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
+
 ## Quick start
 
 Register your checkpointer with `@checkpointer_test` and run `validate()`:
@@ -63,6 +75,7 @@ The suite tests **base** capabilities (required) and **extended** capabilities (
 | `delete_for_runs` | no | `adelete_for_runs` |
 | `copy_thread` | no | `acopy_thread` |
 | `prune` | no | `aprune` |
+| `delta_channel_history` | no | `aget_delta_channel_history` |
 
 Extended capabilities are detected by checking whether the method is overridden from `BaseCheckpointSaver`. If not overridden, those tests are skipped.
 
@@ -109,3 +122,13 @@ async def pg_checkpointer():
     async with PostgresSaver.from_conn_string(CONN_STRING) as saver:
         yield saver
 ```
+
+## 📕 Releases & Versioning
+
+See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
+
+## 💁 Contributing
+
+As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
+
+For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).

libs/checkpoint-conformance/langgraph/checkpoint/conformance/capabilities.py

@@ -23,6 +23,7 @@ class Capability(str, Enum):
     DELETE_FOR_RUNS = "delete_for_runs"
     COPY_THREAD = "copy_thread"
     PRUNE = "prune"
+    DELTA_CHANNEL_HISTORY = "delta_channel_history"
 
 
 # Capabilities that every checkpointer must support.
@@ -42,6 +43,7 @@ EXTENDED_CAPABILITIES = frozenset(
         Capability.DELETE_FOR_RUNS,
         Capability.COPY_THREAD,
         Capability.PRUNE,
+        Capability.DELTA_CHANNEL_HISTORY,
     }
 )
 
@@ -57,6 +59,7 @@ _CAPABILITY_METHOD_MAP: dict[Capability, str] = {
     Capability.DELETE_FOR_RUNS: "adelete_for_runs",
     Capability.COPY_THREAD: "acopy_thread",
     Capability.PRUNE: "aprune",
+    Capability.DELTA_CHANNEL_HISTORY: "aget_delta_channel_history",
 }
 
 

libs/checkpoint-conformance/langgraph/checkpoint/conformance/spec/__init__.py

@@ -9,6 +9,9 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
     run_delete_thread_tests,
 )
+from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
+    run_delta_channel_history_tests,
+)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -24,4 +27,5 @@ __all__ = [
     "run_delete_for_runs_tests",
     "run_copy_thread_tests",
     "run_prune_tests",
+    "run_delta_channel_history_tests",
 ]

libs/checkpoint-conformance/langgraph/checkpoint/conformance/spec/_delta_fixtures.py

@@ -0,0 +1,99 @@
+"""Shared fixtures for delta-channel conformance tests.
+
+Builds a parent chain with `_DeltaSnapshot` blobs at known positions via
+direct `aput` / `aput_writes` calls. No langgraph or Pregel dependency.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Sequence
+from typing import Any
+from uuid import uuid4
+
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
+from langgraph.checkpoint.base.id import uuid6
+
+from langgraph.checkpoint.conformance.test_utils import generate_metadata
+
+
+async def build_delta_chain(
+    saver: BaseCheckpointSaver,
+    *,
+    thread_id: str | None = None,
+    checkpoint_ns: str = "",
+    channel: str = "messages",
+    snapshots_at_steps: Sequence[int] = (0,),
+    total_steps: int = 6,
+    write_value_fn: Any | None = None,
+) -> list[RunnableConfig]:
+    """Build a parent chain with `_DeltaSnapshot` at known positions.
+
+    Args:
+        saver: Checkpointer instance.
+        thread_id: Defaults to a random UUID.
+        checkpoint_ns: Namespace (default root).
+        channel: Channel name used for snapshots and writes.
+        snapshots_at_steps: Steps at which a `_DeltaSnapshot` blob is stored
+            in `channel_values[channel]`. Step 0 is the oldest checkpoint.
+        total_steps: Number of checkpoints in the chain.
+        write_value_fn: Callable(step) -> write value. Defaults to step index.
+
+    Returns:
+        List of stored configs (oldest first), one per step.
+    """
+    if write_value_fn is None:
+
+        def write_value_fn(step: int) -> Any:
+            return step
+
+    from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
+    thread_id = thread_id or str(uuid4())
+    snapshot_set = set(snapshots_at_steps)
+    stored: list[RunnableConfig] = []
+    parent_cfg: RunnableConfig | None = None
+
+    for step in range(total_steps):
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": checkpoint_ns,
+            }
+        }
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+
+        channel_values: dict[str, Any] = {}
+        channel_versions: dict[str, int] = {}
+        if step in snapshot_set:
+            channel_values[channel] = _DeltaSnapshot(
+                write_value_fn(step),
+            )
+            channel_versions[channel] = step + 1
+
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=channel_values,
+            channel_versions=channel_versions,
+            versions_seen={},
+            updated_channels=None,
+        )
+        new_versions = dict(channel_versions)
+        parent_cfg = await saver.aput(
+            config, cp, generate_metadata(step=step), new_versions
+        )
+        stored.append(parent_cfg)
+
+        # Write a pending write for non-snapshot steps so the walk has
+        # something to collect.
+        if step not in snapshot_set:
+            await saver.aput_writes(
+                parent_cfg, [(channel, write_value_fn(step))], str(uuid4())
+            )
+
+    return stored

libs/checkpoint-conformance/langgraph/checkpoint/conformance/spec/test_delta_channel_history.py

@@ -0,0 +1,307 @@
+"""DELTA_CHANNEL_HISTORY capability tests — aget_delta_channel_history contract."""
+
+from __future__ import annotations
+
+import traceback
+from collections.abc import Callable
+from uuid import uuid4
+
+from langgraph.checkpoint.base import BaseCheckpointSaver, Checkpoint
+from langgraph.checkpoint.base.id import uuid6
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
+from langgraph.checkpoint.conformance.spec._delta_fixtures import build_delta_chain
+from langgraph.checkpoint.conformance.test_utils import generate_metadata
+
+
+async def test_history_returns_writes_oldest_first(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Writes are returned oldest-to-newest."""
+    tid = str(uuid4())
+    # 5 steps: snapshot at 0, writes at 1,2,3,4.
+    # Head is step 4. Walk starts at step 3 (parent of head).
+    # Collects writes from steps 1,2,3 (between snapshot at 0 and head's parent).
+    configs = await build_delta_chain(
+        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=5
+    )
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert values == [1, 2, 3], f"Expected [1,2,3], got {values}"
+
+
+async def test_history_seed_is_nearest_snapshot(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Seed is the value from the nearest ancestor with channel_values populated."""
+    tid = str(uuid4())
+    # 6 steps: snapshots at 0 and 3, writes at 1,2,4,5.
+    # Head is step 5. Walk from step 4 backward stops at step 3 (snapshot).
+    # Collects writes from step 4 only (between step 3 and head's parent step 4).
+    configs = await build_delta_chain(
+        saver,
+        thread_id=tid,
+        channel="ch",
+        snapshots_at_steps=[0, 3],
+        total_steps=6,
+    )
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    assert "seed" in result["ch"], "Expected seed from snapshot at step 3"
+    seed = result["ch"]["seed"]
+    actual_value = seed.value if isinstance(seed, _DeltaSnapshot) else seed
+    assert actual_value == 3, f"Expected seed value 3 (step 3), got {actual_value}"
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert values == [4], f"Expected [4], got {values}"
+
+
+async def test_history_excludes_target_pending_writes(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Target's own pending_writes are NOT included in the history."""
+    tid = str(uuid4())
+    configs = await build_delta_chain(
+        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=3
+    )
+    head = configs[-1]
+    # Add writes directly to the head checkpoint
+    await saver.aput_writes(head, [("ch", "extra")], str(uuid4()))
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert "extra" not in values, f"Target's writes should be excluded, got {values}"
+
+
+async def test_history_multi_channel(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Multiple channels have independent walk termination."""
+    tid = str(uuid4())
+    configs: list = []
+    parent_cfg = None
+
+    for step in range(5):
+        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+        cv: dict = {}
+        cvs: dict = {}
+        if step == 1:
+            cv["a"] = _DeltaSnapshot("snap_a")
+            cvs["a"] = step + 1
+        if step == 3:
+            cv["b"] = _DeltaSnapshot("snap_b")
+            cvs["b"] = step + 1
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=cv,
+            channel_versions=cvs,
+            versions_seen={},
+            updated_channels=None,
+        )
+        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
+        configs.append(parent_cfg)
+        await saver.aput_writes(parent_cfg, [("a", step), ("b", step)], str(uuid4()))
+
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["a", "b"])
+    a_writes = [w[2] for w in result["a"]["writes"]]
+    b_writes = [w[2] for w in result["b"]["writes"]]
+    assert a_writes == [1, 2, 3], f"Expected a writes [1,2,3], got {a_writes}"
+    assert b_writes == [3], f"Expected b writes [3], got {b_writes}"
+
+
+async def test_history_empty_channels_returns_empty(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Empty channels list returns empty mapping."""
+    tid = str(uuid4())
+    configs = await build_delta_chain(
+        saver, thread_id=tid, channel="ch", snapshots_at_steps=[0], total_steps=3
+    )
+    result = await saver.aget_delta_channel_history(config=configs[-1], channels=[])
+    assert result == {}
+
+
+async def test_history_walk_to_root_no_seed(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Walk reaches root without finding seed — no 'seed' key in result."""
+    tid = str(uuid4())
+    configs = await build_delta_chain(
+        saver,
+        thread_id=tid,
+        channel="ch",
+        snapshots_at_steps=[],
+        total_steps=4,
+    )
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    assert "seed" not in result["ch"], f"Expected no seed, got {result['ch']}"
+
+
+async def test_history_migration_plain_value_as_seed(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Pre-delta plain value in channel_values acts as seed (migration case).
+
+    When a thread was originally using a regular channel (BinaryOperatorAggregate)
+    and later switches to DeltaChannel, the old checkpoint has a plain value in
+    channel_values[ch] (not a _DeltaSnapshot). The walk should treat it as the
+    seed and terminate there.
+    """
+    tid = str(uuid4())
+    configs: list = []
+    parent_cfg = None
+
+    for step in range(4):
+        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+        cv: dict = {}
+        cvs: dict = {}
+        # Step 1: plain value (migration case — old checkpoint before delta)
+        if step == 1:
+            cv["ch"] = [10, 20, 30]
+            cvs["ch"] = step + 1
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=cv,
+            channel_versions=cvs,
+            versions_seen={},
+            updated_channels=None,
+        )
+        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
+        configs.append(parent_cfg)
+        if step != 1:
+            await saver.aput_writes(parent_cfg, [("ch", step)], str(uuid4()))
+
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+    # Seed should be the plain value from step 1
+    assert "seed" in result["ch"], "Expected seed from migration plain value at step 1"
+    seed = result["ch"]["seed"]
+    assert seed == [10, 20, 30], f"Expected plain value [10,20,30], got {seed}"
+    # Writes should be from step 2 only (between seed at step 1 and head's parent step 2)
+    writes = result["ch"]["writes"]
+    values = [w[2] for w in writes]
+    assert values == [2], f"Expected [2], got {values}"
+
+
+async def test_history_seed_ancestor_own_writes_are_replayed(
+    saver: BaseCheckpointSaver,
+) -> None:
+    """Writes stored AT the seed ancestor must be included in `writes`.
+
+    A stored value is the state ENTERING its checkpoint; the writes stored
+    under that same checkpoint are what produced its child and are therefore
+    NOT subsumed by it. Only writes at ancestors OLDER than the seed are
+    subsumed, and the walk terminates before reaching them.
+
+    This holds for plain-value seeds (migration from a pre-delta channel type)
+    exactly as it does for `_DeltaSnapshot` seeds. Skipping the seed
+    ancestor's own writes silently drops the first post-migration write.
+    """
+    tid = str(uuid4())
+    configs: list = []
+    parent_cfg = None
+
+    # Each step's write is labelled by the role it plays, so the assertion
+    # below reads directly rather than by step index.
+    writes_by_step = {
+        0: "older-than-seed",  # subsumed by the value stored at step 1
+        1: "at-seed",  # the seed's own write, produced step 2
+        2: "after-seed",  # delta-era write on the path to the head
+        3: "pending-at-head",  # pending for the next step, never replayed
+    }
+    # Steps 0 and 1 store a plain value; 1 is the nearest, so it is the seed.
+    values_by_step = {0: [10], 1: [10, 20]}
+
+    for step in range(4):
+        config = {"configurable": {"thread_id": tid, "checkpoint_ns": ""}}
+        if parent_cfg:
+            config["configurable"]["checkpoint_id"] = parent_cfg["configurable"][
+                "checkpoint_id"
+            ]
+        cv: dict = {}
+        cvs: dict = {}
+        if step in values_by_step:
+            cv["ch"] = values_by_step[step]
+            cvs["ch"] = step + 1
+        cp = Checkpoint(
+            v=1,
+            id=str(uuid6(clock_seq=-1)),
+            ts="",
+            channel_values=cv,
+            channel_versions=cvs,
+            versions_seen={},
+            updated_channels=None,
+        )
+        parent_cfg = await saver.aput(config, cp, generate_metadata(step=step), cvs)
+        configs.append(parent_cfg)
+        await saver.aput_writes(
+            parent_cfg, [("ch", writes_by_step[step])], str(uuid4())
+        )
+
+    head = configs[-1]
+    result = await saver.aget_delta_channel_history(config=head, channels=["ch"])
+
+    assert "seed" in result["ch"], "Expected seed from plain value at step 1"
+    assert result["ch"]["seed"] == [10, 20], (
+        f"Expected nearest plain value [10, 20], got {result['ch']['seed']}"
+    )
+    values = [w[2] for w in result["ch"]["writes"]]
+    assert values == ["at-seed", "after-seed"], (
+        f'Expected ["at-seed", "after-seed"], got {values}'
+    )
+
+
+ALL_DELTA_CHANNEL_HISTORY_TESTS = [
+    test_history_returns_writes_oldest_first,
+    test_history_seed_is_nearest_snapshot,
+    test_history_excludes_target_pending_writes,
+    test_history_multi_channel,
+    test_history_empty_channels_returns_empty,
+    test_history_walk_to_root_no_seed,
+    test_history_migration_plain_value_as_seed,
+    test_history_seed_ancestor_own_writes_are_replayed,
+]
+
+
+async def run_delta_channel_history_tests(
+    saver: BaseCheckpointSaver,
+    on_test_result: Callable[[str, str, bool, str | None], None] | None = None,
+) -> tuple[int, int, list[str]]:
+    """Run all delta_channel_history tests. Returns (passed, failed, failure_names)."""
+    passed = 0
+    failed = 0
+    failures: list[str] = []
+    for test_fn in ALL_DELTA_CHANNEL_HISTORY_TESTS:
+        try:
+            await test_fn(saver)
+            passed += 1
+            if on_test_result:
+                on_test_result("delta_channel_history", test_fn.__name__, True, None)
+        except Exception:
+            failed += 1
+            msg = f"{test_fn.__name__}: {traceback.format_exc()}"
+            failures.append(msg)
+            if on_test_result:
+                on_test_result(
+                    "delta_channel_history",
+                    test_fn.__name__,
+                    False,
+                    traceback.format_exc(),
+                )
+    return passed, failed, failures

libs/checkpoint-conformance/langgraph/checkpoint/conformance/spec/test_list.py

@@ -4,6 +4,7 @@ from __future__ import annotations
 
 import traceback
 from collections.abc import Callable
+from typing import cast
 from uuid import uuid4
 
 from langgraph.checkpoint.base import BaseCheckpointSaver
@@ -335,39 +336,9 @@ async def test_list_metadata_custom_keys(
         results.append(tup)
 
     assert len(results) == 1
-    assert results[0].metadata["score"] == 42
-    assert results[0].metadata["run_id"] == "run-abc"
-
-
-async def test_list_global_search(
-    saver: BaseCheckpointSaver,
-) -> None:
-    """alist(None, filter=...) searches across all threads."""
-    tid1, tid2 = str(uuid4()), str(uuid4())
-
-    # Use a unique marker so we don't collide with other tests' data
-    marker = str(uuid4())
-
-    cfg1 = generate_config(tid1)
-    cp1 = generate_checkpoint()
-    await saver.aput(cfg1, cp1, generate_metadata(source="input", marker=marker), {})
-
-    cfg2 = generate_config(tid2)
-    cp2 = generate_checkpoint()
-    await saver.aput(cfg2, cp2, generate_metadata(source="loop", marker=marker), {})
-
-    # Search across all threads with filter
-    results = []
-    async for tup in saver.alist(None, filter={"source": "input", "marker": marker}):
-        results.append(tup)
-    assert len(results) == 1
-    assert results[0].config["configurable"]["thread_id"] == tid1
-
-    # Search with marker only — should find both
-    results = []
-    async for tup in saver.alist(None, filter={"marker": marker}):
-        results.append(tup)
-    assert len(results) == 2
+    metadata = cast(dict[str, object], results[0].metadata)
+    assert metadata["score"] == 42
+    assert metadata["run_id"] == "run-abc"
 
 
 ALL_LIST_TESTS = [
@@ -380,7 +351,6 @@ ALL_LIST_TESTS = [
     test_list_metadata_filter_multiple_keys,
     test_list_metadata_filter_no_match,
     test_list_metadata_custom_keys,
-    test_list_global_search,
     test_list_before,
     test_list_limit,
     test_list_limit_plus_before,

libs/checkpoint-conformance/langgraph/checkpoint/conformance/test_utils.py

@@ -89,7 +89,7 @@ async def put_test_checkpoint(
     vals = channel_values or {}
     cv = channel_versions
     if cv is None and vals:
-        cv = {k: 1 for k in vals}
+        cv: ChannelVersions = {k: 1 for k in vals}
         cp["channel_versions"] = cv
     nv = new_versions
     if nv is None:

libs/checkpoint-conformance/langgraph/checkpoint/conformance/validate.py

@@ -19,6 +19,9 @@ from langgraph.checkpoint.conformance.spec.test_delete_for_runs import (
 from langgraph.checkpoint.conformance.spec.test_delete_thread import (
     run_delete_thread_tests,
 )
+from langgraph.checkpoint.conformance.spec.test_delta_channel_history import (
+    run_delta_channel_history_tests,
+)
 from langgraph.checkpoint.conformance.spec.test_get_tuple import run_get_tuple_tests
 from langgraph.checkpoint.conformance.spec.test_list import run_list_tests
 from langgraph.checkpoint.conformance.spec.test_prune import run_prune_tests
@@ -35,6 +38,7 @@ _RUNNERS = {
     Capability.DELETE_FOR_RUNS: run_delete_for_runs_tests,
     Capability.COPY_THREAD: run_copy_thread_tests,
     Capability.PRUNE: run_prune_tests,
+    Capability.DELTA_CHANNEL_HISTORY: run_delta_channel_history_tests,
 }
 
 

libs/checkpoint-conformance/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-conformance"
-version = "0.0.1"
+version = "0.0.2"
 description = "Conformance test suite for LangGraph checkpointer implementations."
 authors = [{name = "William FH", email = "13333726+hinthornw@users.noreply.github.com"}]
 requires-python = ">=3.10"
@@ -43,7 +43,11 @@ asyncio_mode = "auto"
 # The extended methods (acopy_thread, adelete_for_runs, aprune) are checked
 # at runtime via capability detection and may not exist on the installed
 # base class. Dict literal inference is also overly strict for RunnableConfig.
+# Delta-channel tests import from `langgraph` (not a declared dep of this
+# package — at test time it is installed alongside); private `_DeltaSnapshot`
+# imports are intentional (beta surface).
 unresolved-attribute = "ignore"
+unresolved-import = "ignore"
 invalid-argument-type = "ignore"
 invalid-return-type = "ignore"
 
@@ -54,10 +58,19 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
+  "PLC0415",  # import-outside-top-level
+  "RUF100",  # unused noqa directive
 ]
 lint.ignore = ["E501", "B008"]
+# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
+# still has deferred imports that have not been reviewed, so it stays exempt
+# for now.
+lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"
 
+[tool.uv.sources]
+langgraph-checkpoint = {path = "../checkpoint", editable = true}
+
 [[tool.uv.index]]
 name = "testpypi"
 url = "https://test.pypi.org/simple/"

libs/checkpoint-postgres/Makefile

@@ -47,22 +47,19 @@ test_watch:
 
 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
-MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph
 lint_tests: PYTHON_FILES=tests
-lint_tests: MYPY_CACHE=.mypy_cache_test
 
 lint lint_diff lint_package lint_tests:
 	uv run ruff check .
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff format $(PYTHON_FILES) --diff
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
-	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run ty check $(PYTHON_FILES)
 
 type:
-	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	uv run ty check $(PYTHON_FILES)
 
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)

libs/checkpoint-postgres/README.md

@@ -1,10 +1,33 @@
 # LangGraph Checkpoint Postgres
 
-Implementation of LangGraph CheckpointSaver that uses Postgres.
+[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint-postgres?label=%20)](https://pypi.org/project/langgraph-checkpoint-postgres/#history)
+[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint-postgres)](https://opensource.org/licenses/MIT)
+[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint-postgres)](https://pypistats.org/packages/langgraph-checkpoint-postgres)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
 
-## Dependencies
+To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
+[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
 
-By default `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) without any extras. However, you can choose a specific installation that best suits your needs [here](https://www.psycopg.org/psycopg3/docs/basic/install.html) (for example, `psycopg[binary]`).
+## Quick Install
+
+```bash
+uv add langgraph-checkpoint-postgres
+```
+
+## 🤔 What is this?
+
+This library provides a Postgres implementation of LangGraph's checkpoint saver. Use it when you want LangGraph state persistence backed by Postgres for durable, long-running workflows and agents.
+
+By default, `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) without any extras. You can choose a specific installation that best suits your needs in the [Psycopg installation docs](https://www.psycopg.org/psycopg3/docs/basic/install.html), for example `psycopg[binary]`.
+
+## 📖 Documentation
+
+For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph.checkpoint.postgres). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
+
+## Security
+
+> [!IMPORTANT]
+> Set `LANGGRAPH_STRICT_MSGPACK=true` or pass an explicit `allowed_msgpack_modules` list when creating your checkpointer. This restricts checkpoint deserialization to known-safe types, preventing code execution if the database is compromised. See the [langgraph-checkpoint README](https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint#serde) for details.
 
 ## Usage
 
@@ -15,10 +38,12 @@ By default `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) withou
 > When manually creating Postgres connections and passing them to `PostgresSaver` or `AsyncPostgresSaver`, make sure to include `autocommit=True` and `row_factory=dict_row` (`from psycopg.rows import dict_row`). See a full example in this [how-to guide](https://langchain-ai.github.io/langgraph/how-tos/persistence_postgres/).
 >
 > **Why these parameters are required:**
+>
 > - `autocommit=True`: Required for the `.setup()` method to properly commit the checkpoint tables to the database. Without this, table creation may not be persisted.
 > - `row_factory=dict_row`: Required because the PostgresSaver implementation accesses database rows using dictionary-style syntax (e.g., `row["column_name"]`). The default `tuple_row` factory returns tuples that only support index-based access (e.g., `row[0]`), which will cause `TypeError` exceptions when the checkpointer tries to access columns by name.
 >
 > **Example of incorrect usage:**
+>
 > ```python
 > # ❌ This will fail with TypeError during checkpointer operations
 > with psycopg.connect(DB_URI) as conn:  # Missing autocommit=True and row_factory=dict_row
@@ -42,24 +67,12 @@ with PostgresSaver.from_conn_string(DB_URI) as checkpointer:
         "v": 4,
         "ts": "2024-07-31T20:14:19.804150+00:00",
         "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {
-            "my_key": "meow",
-            "node": "node"
-        },
-        "channel_versions": {
-            "__start__": 2,
-            "my_key": 3,
-            "start:node": 3,
-            "node": 3
-        },
+        "channel_values": {"my_key": "meow", "node": "node"},
+        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
         "versions_seen": {
             "__input__": {},
-            "__start__": {
-            "__start__": 1
-            },
-            "node": {
-            "start:node": 2
-            }
+            "__start__": {"__start__": 1},
+            "node": {"start:node": 2},
         },
     }
 
@@ -83,24 +96,12 @@ async with AsyncPostgresSaver.from_conn_string(DB_URI) as checkpointer:
         "v": 4,
         "ts": "2024-07-31T20:14:19.804150+00:00",
         "id": "1ef4f797-8335-6428-8001-8a1503f9b875",
-        "channel_values": {
-            "my_key": "meow",
-            "node": "node"
-        },
-        "channel_versions": {
-            "__start__": 2,
-            "my_key": 3,
-            "start:node": 3,
-            "node": 3
-        },
+        "channel_values": {"my_key": "meow", "node": "node"},
+        "channel_versions": {"__start__": 2, "my_key": 3, "start:node": 3, "node": 3},
         "versions_seen": {
             "__input__": {},
-            "__start__": {
-            "__start__": 1
-            },
-            "node": {
-            "start:node": 2
-            }
+            "__start__": {"__start__": 1},
+            "node": {"start:node": 2},
         },
     }
 
@@ -113,3 +114,13 @@ async with AsyncPostgresSaver.from_conn_string(DB_URI) as checkpointer:
     # list checkpoints
     [c async for c in checkpointer.alist(read_config)]
 ```
+
+## 📕 Releases & Versioning
+
+See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
+
+## 💁 Contributing
+
+As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
+
+For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).

libs/checkpoint-postgres/langgraph/checkpoint/postgres/__init__.py

@@ -2,9 +2,9 @@ from __future__ import annotations
 
 import threading
 from collections import defaultdict
-from collections.abc import Iterator, Sequence
+from collections.abc import Iterator, Mapping, Sequence
 from contextlib import contextmanager
-from typing import Any
+from typing import Any, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
@@ -13,17 +13,25 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     get_checkpoint_id,
     get_serializable_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.base import SerializerProtocol
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from psycopg import Capabilities, Connection, Cursor, Pipeline
 from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
 from psycopg_pool import ConnectionPool
 
 from langgraph.checkpoint.postgres import _internal
-from langgraph.checkpoint.postgres.base import BasePostgresSaver
+from langgraph.checkpoint.postgres.base import (
+    _DELTA_PAGE_SIZE,
+    BasePostgresSaver,
+    _build_delta_stage1_sql,
+    _build_delta_stage2_sql,
+    _DeltaStage2Row,
+)
 from langgraph.checkpoint.postgres.shallow import ShallowPostgresSaver
 
 Conn = _internal.Conn  # For backward compatibility
@@ -215,7 +223,7 @@ class PostgresSaver(BasePostgresSaver):
             >>> checkpoint_tuple = memory.get_tuple(config)
             >>> print(checkpoint_tuple)
             CheckpointTuple(...)
-        """  # noqa
+        """
         thread_id = config["configurable"]["thread_id"]
         checkpoint_id = get_checkpoint_id(config)
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
@@ -302,7 +310,10 @@ class PostgresSaver(BasePostgresSaver):
         # others are stored in blobs table
         blob_values = {}
         for k, v in checkpoint["channel_values"].items():
-            if v is None or isinstance(v, (str, int, float, bool)):
+            if isinstance(v, _DeltaSnapshot):
+                blob_values[k] = copy["channel_values"].pop(k)
+                copy["channel_values"][k] = True
+            elif v is None or isinstance(v, (str, int, float, bool)):
                 pass
             else:
                 blob_values[k] = copy["channel_values"].pop(k)
@@ -430,6 +441,121 @@ class PostgresSaver(BasePostgresSaver):
                 with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.get_delta_channel_history`.
+
+        Two-stage query, both stages cover ALL requested channels:
+
+        * Stage 1 (paged): dynamic SELECT over `checkpoints` with K parallel
+          JSONB key lookups (one column pair per channel) — no subquery, no
+          aggregation. Pages newest-first by `checkpoint_id` with a cursor;
+          page size is `_DELTA_PAGE_SIZE`. Stops paging when every channel
+          has found its seed or the chain is exhausted.
+
+        * Stage 2 (per-channel UNION ALL): one branch per channel reading
+          `checkpoint_writes` filtered to that channel's specific
+          `chain_cids`, plus one branch per channel that has a seed reading
+          `checkpoint_blobs` for that channel + version. Avoids the
+          over-fetch of a single `channel = ANY(channels)` filter when
+          channels have different chain depths.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = self.get_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        # Stage 1: paged K-JSONB-lookup scan, walking the parent chain in
+        # Python after each page. Stops as soon as every channel has its seed.
+        stage1_sql = _build_delta_stage1_sql(channels, paged=True)
+        parent_of: dict[str, str | None] = {}
+        ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
+        hb_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
+        inline_by_i_by_cid: list[dict[str, Any]] = [{} for _ in channels]
+        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
+        seed_ver_by_ch: dict[str, str | None] = {ch: None for ch in channels}
+        seed_inline_by_ch: dict[str, Any] = {}
+        walk_cursor_by_ch: dict[str, str | None] = {}
+        seeded: set[str] = set()
+        cursor: str | None = None
+
+        with self._cursor() as cur:
+            while True:
+                stage1_params: list[Any] = []
+                for ch in channels:
+                    # ver_i, blob channel, blob version, inline_i
+                    stage1_params.extend([ch, ch, ch, ch])
+                stage1_params.extend(
+                    [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
+                )
+                cur.execute(stage1_sql, stage1_params)
+                page = cur.fetchall()
+                if not page:
+                    break
+                oldest = self._ingest_stage1_page(
+                    cast("list[Mapping[str, Any]]", page),
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hb_by_i_by_cid,
+                    inline_by_i_by_cid,
+                )
+                self._try_advance_walks(
+                    checkpoint_id,
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hb_by_i_by_cid,
+                    inline_by_i_by_cid,
+                    chain_by_ch,
+                    seed_ver_by_ch,
+                    seed_inline_by_ch,
+                    walk_cursor_by_ch,
+                    seeded,
+                )
+                # Stop if every channel is seeded, or the page was short
+                # (chain exhausted — no more rows to fetch).
+                if len(seeded) == len(channels) or len(page) < _DELTA_PAGE_SIZE:
+                    break
+                cursor = oldest
+
+        # Stage 2: per-channel UNION ALL — one writes branch per channel
+        # with non-empty chain, plus one blob branch per seeded channel.
+        channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+        channels_with_seed = [ch for ch in channels if seed_ver_by_ch[ch] is not None]
+        stage2_sql = _build_delta_stage2_sql(
+            channels_with_chain=channels_with_chain,
+            channels_with_seed=channels_with_seed,
+        )
+
+        if stage2_sql:
+            stage2_params: list[Any] = []
+            for ch in channels_with_chain:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, chain_by_ch[ch]])
+            for ch in channels_with_seed:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, seed_ver_by_ch[ch]])
+            with self._cursor() as cur:
+                cur.execute(stage2_sql, stage2_params)
+                stage2_rows = cur.fetchall()
+        else:
+            stage2_rows = []
+
+        return self._build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_ver_by_ch=seed_ver_by_ch,
+            seed_inline_by_ch=seed_inline_by_ch,
+            stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
+        )
+
     def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
         """
         Convert a database row into a CheckpointTuple object.

libs/checkpoint-postgres/langgraph/checkpoint/postgres/aio.py

@@ -2,9 +2,9 @@ from __future__ import annotations
 
 import asyncio
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Sequence
+from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
 from contextlib import asynccontextmanager
-from typing import Any
+from typing import Any, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
@@ -13,17 +13,25 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     get_checkpoint_id,
     get_serializable_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.base import SerializerProtocol
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
 from psycopg import AsyncConnection, AsyncCursor, AsyncPipeline, Capabilities
 from psycopg.rows import DictRow, dict_row
 from psycopg.types.json import Jsonb
 from psycopg_pool import AsyncConnectionPool
 
 from langgraph.checkpoint.postgres import _ainternal
-from langgraph.checkpoint.postgres.base import BasePostgresSaver
+from langgraph.checkpoint.postgres.base import (
+    _DELTA_PAGE_SIZE,
+    BasePostgresSaver,
+    _build_delta_stage1_sql,
+    _build_delta_stage2_sql,
+    _DeltaStage2Row,
+)
 from langgraph.checkpoint.postgres.shallow import AsyncShallowPostgresSaver
 
 Conn = _ainternal.Conn  # For backward compatibility
@@ -261,7 +269,10 @@ class AsyncPostgresSaver(BasePostgresSaver):
         # others are stored in blobs table
         blob_values = {}
         for k, v in checkpoint["channel_values"].items():
-            if v is None or isinstance(v, (str, int, float, bool)):
+            if isinstance(v, _DeltaSnapshot):
+                blob_values[k] = copy["channel_values"].pop(k)
+                copy["channel_values"][k] = True
+            elif v is None or isinstance(v, (str, int, float, bool)):
                 pass
             else:
                 blob_values[k] = copy["channel_values"].pop(k)
@@ -391,6 +402,104 @@ class AsyncPostgresSaver(BasePostgresSaver):
                 async with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.aget_delta_channel_history`.
+
+        See `PostgresSaver.get_delta_channel_history` for design notes; this is
+        the async equivalent with internal stage-1 paging and per-channel
+        UNION ALL stage-2.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = await self.aget_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        stage1_sql = _build_delta_stage1_sql(channels, paged=True)
+        parent_of: dict[str, str | None] = {}
+        ver_by_i_by_cid: list[dict[str, str | None]] = [{} for _ in channels]
+        hb_by_i_by_cid: list[dict[str, bool]] = [{} for _ in channels]
+        inline_by_i_by_cid: list[dict[str, Any]] = [{} for _ in channels]
+        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
+        seed_ver_by_ch: dict[str, str | None] = {ch: None for ch in channels}
+        seed_inline_by_ch: dict[str, Any] = {}
+        walk_cursor_by_ch: dict[str, str | None] = {}
+        seeded: set[str] = set()
+        cursor: str | None = None
+
+        async with self._cursor() as cur:
+            while True:
+                stage1_params: list[Any] = []
+                for ch in channels:
+                    # ver_i, blob channel, blob version, inline_i
+                    stage1_params.extend([ch, ch, ch, ch])
+                stage1_params.extend(
+                    [thread_id, checkpoint_ns, cursor, cursor, _DELTA_PAGE_SIZE]
+                )
+                await cur.execute(stage1_sql, stage1_params)
+                page = await cur.fetchall()
+                if not page:
+                    break
+                oldest = self._ingest_stage1_page(
+                    cast("list[Mapping[str, Any]]", page),
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hb_by_i_by_cid,
+                    inline_by_i_by_cid,
+                )
+                self._try_advance_walks(
+                    checkpoint_id,
+                    channels,
+                    parent_of,
+                    ver_by_i_by_cid,
+                    hb_by_i_by_cid,
+                    inline_by_i_by_cid,
+                    chain_by_ch,
+                    seed_ver_by_ch,
+                    seed_inline_by_ch,
+                    walk_cursor_by_ch,
+                    seeded,
+                )
+                if len(seeded) == len(channels) or len(page) < _DELTA_PAGE_SIZE:
+                    break
+                cursor = oldest
+
+        channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+        channels_with_seed = [ch for ch in channels if seed_ver_by_ch[ch] is not None]
+        stage2_sql = _build_delta_stage2_sql(
+            channels_with_chain=channels_with_chain,
+            channels_with_seed=channels_with_seed,
+        )
+
+        if stage2_sql:
+            stage2_params: list[Any] = []
+            for ch in channels_with_chain:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, chain_by_ch[ch]])
+            for ch in channels_with_seed:
+                stage2_params.extend([thread_id, checkpoint_ns, ch, seed_ver_by_ch[ch]])
+            async with self._cursor() as cur:
+                await cur.execute(stage2_sql, stage2_params)
+                stage2_rows = await cur.fetchall()
+        else:
+            stage2_rows = []
+
+        return self._build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_ver_by_ch=seed_ver_by_ch,
+            seed_inline_by_ch=seed_inline_by_ch,
+            stage2_rows=cast("list[_DeltaStage2Row]", stage2_rows),
+        )
+
     async def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
         """
         Convert a database row into a CheckpointTuple object.
@@ -471,7 +580,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
+                    anext(aiter_),  # type: ignore[arg-type]
                     self.loop,
                 ).result()
             except StopAsyncIteration:

libs/checkpoint-postgres/langgraph/checkpoint/postgres/base.py

@@ -2,20 +2,26 @@ from __future__ import annotations
 
 import random
 import warnings
-from collections.abc import Sequence
+from collections.abc import Mapping, Sequence
 from importlib.metadata import version as get_version
-from typing import Any, cast
+from typing import Any, TypedDict, cast
 
 from langchain_core.runnables import RunnableConfig
 from langgraph.checkpoint.base import (
     WRITES_IDX_MAP,
     BaseCheckpointSaver,
     ChannelVersions,
+    DeltaChannelHistory,
+    PendingWrite,
     get_checkpoint_id,
 )
 from langgraph.checkpoint.serde.types import TASKS
 from psycopg.types.json import Jsonb
 
+# Page size for stage-1 paged scan in `get_delta_channel_history`. Internal
+# constant — exposing this as a kwarg is left as a follow-up.
+_DELTA_PAGE_SIZE = 1024
+
 MetadataInput = dict[str, Any] | None
 
 try:
@@ -153,6 +159,188 @@ INSERT_CHECKPOINT_WRITES_SQL = """
 """
 
 
+class _DeltaStage2Row(TypedDict, total=False):
+    """One row from `_build_delta_stage2_sql` (a UNION ALL of writes and blobs)."""
+
+    _kind: str  # "w" or "b"
+    checkpoint_id: str | None  # "w" rows only
+    channel: str | None  # set on both "w" and "b" rows
+    type: str | None
+    blob: bytes | None
+    task_id: str | None  # "w" rows only
+    idx: int | None  # "w" rows only
+    version: str | None  # "b" rows only
+
+
+# Multi-channel two-stage DeltaChannel reconstruction.
+#
+# Stage 1 scans checkpoint metadata (no blob bytes) and emits one row per
+# checkpoint with K parallel JSONB key lookups (one column pair per
+# requested delta channel: ver_i / hs_i).  No subqueries, no aggregation.
+# Python walks the parent chain once across all channels.
+#
+# Stage 2 fetches all writes and the seed blobs for ALL channels in a
+# single roundtrip via `channel = ANY(%s)` and chain/seed-version
+# filtering.
+#
+# Empirical comparison vs an alternative "ship full channel_versions /
+# channel_values JSONB and let Python pick" form (1000 checkpoints,
+# 8 total channels in graph, 3 delta channels requested):
+#
+#   Postgres execution:    A=0.24ms vs B=0.38ms   (both negligible)
+#   End-to-end latency:    A=6.83ms vs B=2.28ms   (B is 3.0x faster)
+#   Wire payload:          A=836KB  vs B=330KB    (61% smaller)
+#   Buffer hits:           identical (167 blocks)
+#
+# B (this dynamic-columns design) wins because it avoids JSONB
+# serialization on the wire and JSONB-to-dict deserialization in
+# psycopg.  Even at K=8 (8 delta channels = 16 dynamic columns), B
+# still beats A end-to-end (4.2ms vs 6.8ms).
+
+
+def _build_delta_stage1_sql(channels: Sequence[str], *, paged: bool) -> str:
+    """Build stage 1 SQL with K parallel version lookups + seed probes.
+
+    For channels=["messages", "files"] (with `paged=True`) the result is::
+
+        SELECT checkpoint_id, parent_checkpoint_id,
+               checkpoint -> 'channel_versions' ->> %s AS ver_0,
+               EXISTS (SELECT 1 FROM checkpoint_blobs b0
+                       WHERE b0.thread_id = checkpoints.thread_id
+                         AND b0.checkpoint_ns = checkpoints.checkpoint_ns
+                         AND b0.channel = %s
+                         AND b0.version = checkpoint -> 'channel_versions' ->> %s
+                         AND b0.type <> 'empty') AS hb_0,
+               checkpoint -> 'channel_values' -> %s AS inline_0,
+               checkpoint -> 'channel_versions' ->> %s AS ver_1,
+               EXISTS (...) AS hb_1,
+               checkpoint -> 'channel_values' -> %s AS inline_1
+        FROM checkpoints
+        WHERE thread_id = %s AND checkpoint_ns = %s
+          AND (%s::text IS NULL OR checkpoint_id < %s)
+        ORDER BY checkpoint_id DESC
+        LIMIT %s
+
+    A stored value for a channel lives in one of two places, because `put`
+    splits them:
+
+    * **blob** — non-primitive values (and `_DeltaSnapshot`) are moved to
+      `checkpoint_blobs`. `hb_i` ("has blob") probes for one. The probe hits
+      that table's primary key `(thread_id, checkpoint_ns, channel, version)`
+      exactly, so it is an index lookup per row per channel.
+    * **inline** — `None`, `str`, `int`, `float` and `bool` stay in the
+      checkpoint's own `channel_values` and get no blob row at all. `inline_i`
+      returns that value.
+
+    Testing only for a key in `channel_values` (the previous approach) missed
+    blob-stored plain values, since `put` leaves an inline marker there for
+    `_DeltaSnapshot` but not for a plain value — which is what a thread
+    migrated from a pre-delta channel type leaves behind. Probing only the
+    blobs table would conversely miss inline primitives. Both are needed, and
+    the caller treats "either present" as the seed.
+
+    `hb_i` also disambiguates the two: for a `_DeltaSnapshot`, `inline_i` is the
+    literal `true` marker rather than the value, so a blob must win over an
+    inline reading whenever one exists. That ordering is what makes a genuine
+    inline `true` (a bool channel) distinguishable from the marker.
+
+    The `type <> 'empty'` predicate mirrors the check stage 2 already applies
+    when resolving the seed blob. `put` does not currently produce `empty` rows
+    on this path — `blob_versions` is filtered to keys present in
+    `channel_values`, so `_dump_blobs`' empty branch is unreachable from it —
+    but without the predicate the two stages could disagree: stage 1 would
+    terminate the walk on a row stage 2 then discards, yielding no seed *and* a
+    truncated write chain, which is the failure this function exists to avoid.
+
+    Channel names are passed as `%s` parameters (safe from SQL injection).
+    Only the column aliases `ver_i` / `hb_i` / `inline_i` and the subquery alias
+    `b{i}` are interpolated into the SQL string (i is bounded by len(channels)
+    and uses safe identifiers).
+
+    Caller must extend params with `[ch_0 x4, ch_1 x4, ..., thread_id, ns,
+    cursor, cursor, page_size]` when `paged=True` — four per channel: the
+    version lookup, the blob's channel, the version the blob must match, and the
+    inline lookup.
+
+    When `paged=False`, the WHERE has no cursor predicate and there's no
+    LIMIT/ORDER BY — kept as a non-public helper for tests/diagnostics.
+    """
+    cols = []
+    for i in range(len(channels)):
+        cols.append(
+            f"checkpoint -> 'channel_versions' ->> %s AS ver_{i}, "
+            f"EXISTS (SELECT 1 FROM checkpoint_blobs b{i} "
+            f"WHERE b{i}.thread_id = checkpoints.thread_id "
+            f"AND b{i}.checkpoint_ns = checkpoints.checkpoint_ns "
+            f"AND b{i}.channel = %s "
+            f"AND b{i}.version = checkpoint -> 'channel_versions' ->> %s "
+            f"AND b{i}.type <> 'empty') AS hb_{i}, "
+            f"checkpoint -> 'channel_values' -> %s AS inline_{i}"
+        )
+    sql = (
+        "SELECT checkpoint_id, parent_checkpoint_id, "
+        + ", ".join(cols)
+        + " FROM checkpoints WHERE thread_id = %s AND checkpoint_ns = %s"
+    )
+    if paged:
+        sql += (
+            " AND (%s::text IS NULL OR checkpoint_id < %s)"
+            " ORDER BY checkpoint_id DESC LIMIT %s"
+        )
+    return sql
+
+
+def _build_delta_stage2_sql(
+    *,
+    channels_with_chain: Sequence[str],
+    channels_with_seed: Sequence[str],
+) -> str:
+    """Build stage 2 SQL as a per-channel UNION ALL.
+
+    For each channel with a non-empty chain, emit one branch reading
+    `checkpoint_writes` for that specific channel + chain_cids. For each
+    channel with a seed_version, emit one branch reading `checkpoint_blobs`
+    for that channel + version. This avoids the over-fetch of the prior
+    `channel = ANY(channels) AND checkpoint_id = ANY(union)` form when
+    channels have different chain depths.
+
+    The caller must pass parameters in matching order:
+
+        for ch in channels_with_chain:
+            params += [thread_id, checkpoint_ns, ch, chain_cids[ch]]
+        for ch in channels_with_seed:
+            params += [thread_id, checkpoint_ns, ch, seed_version[ch]]
+
+    Returns an empty SQL string if both channel lists are empty (caller
+    must skip executing in that case).
+    """
+    branches: list[str] = []
+    for _ in channels_with_chain:
+        branches.append(
+            "SELECT 'w'::text AS _kind, "
+            "checkpoint_id, channel, "
+            "type, blob, task_id, idx, NULL::text AS version "
+            "FROM checkpoint_writes "
+            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
+            "AND checkpoint_id = ANY(%s)"
+        )
+    for _ in channels_with_seed:
+        branches.append(
+            "SELECT 'b'::text AS _kind, NULL::text AS checkpoint_id, channel, "
+            "type, blob, NULL::text AS task_id, NULL::int AS idx, version "
+            "FROM checkpoint_blobs "
+            "WHERE thread_id = %s AND checkpoint_ns = %s AND channel = %s "
+            "AND version = %s"
+        )
+    return " UNION ALL ".join(branches)
+
+
+# Stage 1 rows are dynamic-shape dicts: {checkpoint_id, parent_checkpoint_id,
+# ver_0, hs_0, ver_1, hs_1, ...}.  Walking is parameterized by the channel
+# list to map indices back to channel names — no static TypedDict here.
+# `dict[str, Any]` is the practical signature.
+
+
 class BasePostgresSaver(BaseCheckpointSaver[str]):
     SELECT_SQL = SELECT_SQL
     SELECT_PENDING_SENDS_SQL = SELECT_PENDING_SENDS_SQL
@@ -195,6 +383,169 @@ class BasePostgresSaver(BaseCheckpointSaver[str]):
             if t.decode() != "empty"
         }
 
+    @staticmethod
+    def _ingest_stage1_page(
+        stage1_rows: Sequence[Mapping[str, Any]],
+        channels: Sequence[str],
+        parent_of: dict[str, str | None],
+        ver_by_i_by_cid: list[dict[str, str | None]],
+        hb_by_i_by_cid: list[dict[str, bool]],
+        inline_by_i_by_cid: list[dict[str, Any]],
+    ) -> str | None:
+        """Fold one stage-1 page into the running walk-state mappings.
+
+        Returns the oldest checkpoint_id seen on this page (smallest, since
+        pages come back DESC). Caller uses it as the cursor for the next
+        page (`AND checkpoint_id < cursor`).
+        """
+        oldest: str | None = None
+        for r in stage1_rows:
+            cid = cast(str, r["checkpoint_id"])
+            parent_of[cid] = cast("str | None", r["parent_checkpoint_id"])
+            for i in range(len(channels)):
+                ver_by_i_by_cid[i][cid] = cast("str | None", r.get(f"ver_{i}"))
+                hb_by_i_by_cid[i][cid] = bool(r.get(f"hb_{i}"))
+                inline_by_i_by_cid[i][cid] = r.get(f"inline_{i}")
+            # Rows are DESC; the last one is the smallest cid in the page.
+            oldest = cid
+        return oldest
+
+    @staticmethod
+    def _try_advance_walks(
+        target_id: str,
+        channels: Sequence[str],
+        parent_of: Mapping[str, str | None],
+        ver_by_i_by_cid: Sequence[Mapping[str, str | None]],
+        hb_by_i_by_cid: Sequence[Mapping[str, bool]],
+        inline_by_i_by_cid: Sequence[Mapping[str, Any]],
+        chain_by_ch: dict[str, list[str]],
+        seed_ver_by_ch: dict[str, str | None],
+        seed_inline_by_ch: dict[str, Any],
+        walk_cursor_by_ch: dict[str, str | None],
+        seeded: set[str],
+    ) -> None:
+        """Advance each not-yet-seeded channel's walk as far as possible.
+
+        Uses the partial `parent_of` map accumulated so far. A walk stops
+        either because:
+          (a) it found a stored value for its channel — a blob or an inline
+              primitive (channel becomes seeded),
+          (b) it reached a real root (parent_of[cid] is None — fully
+              materialized at this point), or
+          (c) the next ancestor cid isn't in `parent_of` yet (waiting for
+              a later page; the cursor stays put).
+
+        Mutates `chain_by_ch`, `seed_ver_by_ch`, `seed_inline_by_ch`,
+        `walk_cursor_by_ch`, and `seeded` in place.
+        """
+        for i, ch in enumerate(channels):
+            if ch in seeded:
+                continue
+            # First-time entry: cursor starts at the target's parent.
+            if ch not in walk_cursor_by_ch:
+                walk_cursor_by_ch[ch] = parent_of.get(target_id)
+            cur_cid = walk_cursor_by_ch[ch]
+            ch_chain = chain_by_ch[ch]
+            hb_i = hb_by_i_by_cid[i]
+            inline_i = inline_by_i_by_cid[i]
+            ver_i = ver_by_i_by_cid[i]
+            while cur_cid is not None:
+                if cur_cid not in parent_of:
+                    # Need more pages to continue this walk.
+                    break
+                ch_chain.append(cur_cid)
+                has_blob = hb_i.get(cur_cid, False)
+                inline = inline_i.get(cur_cid)
+                if has_blob or inline is not None:
+                    # A blob wins: for a `_DeltaSnapshot` the inline reading is
+                    # the `true` marker, not the value.
+                    seed_ver_by_ch[ch] = ver_i.get(cur_cid)
+                    if not has_blob:
+                        seed_inline_by_ch[ch] = inline
+                    seeded.add(ch)
+                    cur_cid = None
+                    break
+                cur_cid = parent_of[cur_cid]
+            walk_cursor_by_ch[ch] = cur_cid
+
+    def _build_delta_channels_writes_history(
+        self,
+        *,
+        channels: Sequence[str],
+        chain_by_ch: Mapping[str, list[str]],
+        seed_ver_by_ch: Mapping[str, str | None],
+        seed_inline_by_ch: Mapping[str, Any],
+        stage2_rows: Sequence[_DeltaStage2Row],
+    ) -> dict[str, DeltaChannelHistory]:
+        """Demux stage 2 rows per channel; produce per-channel histories.
+
+        stage2_rows carry `channel` on every row. We build per-channel
+        `writes_by_cid` and per-channel `seed_blob` dicts, then assemble
+        a `DeltaChannelHistory` per requested channel.
+
+        A seed comes from the blobs table when the walk found one there, and
+        otherwise from `seed_inline_by_ch` — `put` keeps `None`, `str`, `int`,
+        `float` and `bool` values in the checkpoint's own `channel_values` with
+        no blob row, so those never appear in `stage2_rows`.
+
+        The `seed` key is omitted when the walk reached root without finding a
+        stored value, or when the seed blob is sentinel "empty" — in both cases
+        the consumer treats absence as "start empty".
+        """
+        # writes_by_ch_by_cid[channel][cid] = list of (type, blob, task_id, idx)
+        writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
+            ch: {} for ch in channels
+        }
+        # seed_blob_by_ver[(channel, version)] = (type, blob)
+        seed_blob_by_ver: dict[tuple[str, str], tuple[str, bytes]] = {}
+
+        for r in stage2_rows:
+            ch = cast(str, r["channel"])
+            kind = r["_kind"]
+            if kind == "w":
+                cid = cast(str, r["checkpoint_id"])
+                writes_by_ch_by_cid.setdefault(ch, {}).setdefault(cid, []).append(
+                    cast(
+                        "tuple[str, bytes, str, int]",
+                        (r["type"], r["blob"], r["task_id"], r["idx"]),
+                    )
+                )
+            else:  # kind == "b"
+                ver = cast(str, r["version"])
+                seed_blob_by_ver[(ch, ver)] = cast(
+                    "tuple[str, bytes]", (r["type"], r["blob"])
+                )
+
+        # Sort writes per (channel, cid) newest-first by (task_id, idx)
+        for cid_map in writes_by_ch_by_cid.values():
+            for ws in cid_map.values():
+                ws.sort(key=lambda w: (w[2], w[3]), reverse=True)
+
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            chain_cids = chain_by_ch.get(ch, [])
+            seed_version = seed_ver_by_ch.get(ch)
+
+            collected: list[PendingWrite] = []
+            cid_writes = writes_by_ch_by_cid.get(ch, {})
+            for cid in chain_cids:
+                for type_tag, write_blob, task_id, _idx in cid_writes.get(cid, []):
+                    val = self.serde.loads_typed((type_tag, write_blob))
+                    collected.append((task_id, ch, val))
+            collected.reverse()
+
+            entry: DeltaChannelHistory = {"writes": collected}
+            if seed_version is not None:
+                blob = seed_blob_by_ver.get((ch, seed_version))
+                if blob is not None and blob[0] != "empty":
+                    entry["seed"] = self.serde.loads_typed(blob)
+                elif ch in seed_inline_by_ch:
+                    # Inline primitive: stored in the checkpoint, not the blobs
+                    # table, so stage 2 never returned a row for it.
+                    entry["seed"] = seed_inline_by_ch[ch]
+            result[ch] = entry
+        return result
+
     def _dump_blobs(
         self,
         thread_id: str,

libs/checkpoint-postgres/langgraph/checkpoint/postgres/shallow.py

@@ -334,7 +334,7 @@ class ShallowPostgresSaver(BasePostgresSaver):
             >>> checkpoint_tuple = memory.get_tuple(config)
             >>> print(checkpoint_tuple)
             CheckpointTuple(...)
-        """  # noqa
+        """
         thread_id = config["configurable"]["thread_id"]
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
         args = (thread_id, checkpoint_ns)
@@ -885,7 +885,7 @@ class AsyncShallowPostgresSaver(BasePostgresSaver):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
+                    anext(aiter_),  # type: ignore[arg-type]
                     self.loop,
                 ).result()
             except StopAsyncIteration:

libs/checkpoint-postgres/langgraph/store/postgres/aio.py

@@ -164,12 +164,11 @@ class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[_ainternal.Con
         grouped_ops, num_ops = _group_ops(ops)
         results: list[Result] = [None] * num_ops
 
-        async with _ainternal.get_connection(self.conn) as conn:
-            if self.pipe:
-                async with self.pipe:
-                    await self._execute_batch(grouped_ops, results, conn)
-            else:
-                await self._execute_batch(grouped_ops, results, conn)
+        if self.pipe:
+            async with self.pipe:
+                await self._execute_batch(grouped_ops, results)
+        else:
+            await self._execute_batch(grouped_ops, results)
 
         return results
 
@@ -410,8 +409,10 @@ class AsyncPostgresStore(AsyncBatchedBaseStore, BasePostgresStore[_ainternal.Con
         self,
         grouped_ops: dict,
         results: list[Result],
-        conn: AsyncConnection[DictRow],
+        conn: AsyncConnection[DictRow] | None = None,
     ) -> None:
+        # Keep `conn` for compatibility with subclasses overriding this private hook.
+        # All database I/O goes through `_cursor()`, which owns connection acquisition.
         async with self._cursor(pipeline=True) as cur:
             if GetOp in grouped_ops:
                 await self._batch_get_ops(

libs/checkpoint-postgres/langgraph/store/postgres/base.py

@@ -4,6 +4,7 @@ import asyncio
 import concurrent.futures
 import json
 import logging
+import re
 import threading
 from collections import defaultdict
 from collections.abc import Callable, Iterable, Iterator, Sequence
@@ -238,6 +239,12 @@ class BasePostgresStore(Generic[C]):
     conn: C
     _deserializer: Callable[[bytes | orjson.Fragment], dict[str, Any]] | None
     index_config: PostgresIndexConfig | None
+    ttl_config: TTLConfig | None
+
+    @property
+    def _omit_expired(self) -> bool:
+        """Whether expired-but-unswept rows should be filtered from reads."""
+        return bool(self.ttl_config and self.ttl_config.get("omit_expired"))
 
     def _get_batch_GET_ops_queries(
         self,
@@ -258,12 +265,17 @@ class BasePostgresStore(Generic[C]):
             namespace_groups[op.namespace].append((idx, op.key))
             refresh_ttls[op.namespace].append(op.refresh_ttl)
 
+        omit_expired = self._omit_expired
+        expiry_clause = (
+            "AND (s.expires_at IS NULL OR s.expires_at > NOW())" if omit_expired else ""
+        )
+
         results = []
         for namespace, items in namespace_groups.items():
             _, keys = zip(*items, strict=False)
             this_refresh_ttls = refresh_ttls[namespace]
 
-            query = """
+            query = f"""
                 WITH passed_in AS (
                     SELECT unnest(%s::text[]) AS key,
                         unnest(%s::bool[])  AS do_refresh
@@ -276,12 +288,14 @@ class BasePostgresStore(Generic[C]):
                     AND s.key    = p.key
                     AND p.do_refresh = TRUE
                     AND s.ttl_minutes IS NOT NULL
+                    {expiry_clause}
                     RETURNING s.key
                 )
                 SELECT s.key, s.value, s.created_at, s.updated_at
                 FROM store s
                 JOIN passed_in p ON s.key = p.key
                 WHERE s.prefix = %s
+                {expiry_clause}
             """
             ns_text = _namespace_to_text(namespace)
             params = (
@@ -422,6 +436,13 @@ class BasePostgresStore(Generic[C]):
         - embedding_requests: list of (original_index_in_search_ops, text_query)
         """
 
+        omit_expired = self._omit_expired
+        search_expiry_clause = (
+            "AND (store.expires_at IS NULL OR store.expires_at > NOW())"
+            if omit_expired
+            else ""
+        )
+
         queries = []
         embedding_requests = []
         for idx, (_, op) in enumerate(search_ops):
@@ -443,8 +464,9 @@ class BasePostgresStore(Generic[C]):
             ns_condition = "TRUE"
             ns_param: Sequence[str] | None = None
             if op.namespace_prefix:
-                ns_condition = "store.prefix LIKE %s"
-                ns_param = (f"{_namespace_to_text(op.namespace_prefix)}%",)
+                ns_condition, ns_param = _namespace_prefix_condition(
+                    op.namespace_prefix
+                )
             else:
                 ns_param = ()
 
@@ -491,7 +513,7 @@ class BasePostgresStore(Generic[C]):
                             {score_operator} AS neg_score
                         FROM store
                         JOIN store_vectors sv ON store.prefix = sv.prefix AND store.key = sv.key
-                        WHERE {ns_condition} {extra_filters}
+                        WHERE {ns_condition} {extra_filters} {search_expiry_clause}
                         ORDER BY {score_operator} ASC
                         LIMIT %s
                     """
@@ -527,7 +549,7 @@ class BasePostgresStore(Generic[C]):
                 base_query = f"""
                         SELECT store.prefix, store.key, store.value, store.created_at, store.updated_at, NULL AS score
                         FROM store
-                        WHERE {ns_condition} {extra_filters}
+                        WHERE {ns_condition} {extra_filters} {search_expiry_clause}
                         ORDER BY store.updated_at DESC
                         LIMIT %s
                         OFFSET %s
@@ -591,18 +613,23 @@ class BasePostgresStore(Generic[C]):
             """
             params: list[Any] = [op.max_depth, op.max_depth]
 
+            omit_expired = self._omit_expired
             conditions = []
+            if omit_expired:
+                conditions.append("(expires_at IS NULL OR expires_at > NOW())")
             if op.match_conditions:
                 for condition in op.match_conditions:
-                    if condition.match_type == "prefix":
-                        conditions.append("prefix LIKE %s")
+                    if condition.match_type in ("prefix", "suffix"):
+                        if not condition.path:
+                            # An empty path constrains nothing; skipping keeps it a
+                            # no-op rather than emitting a pattern that matches no
+                            # namespace at all.
+                            continue
+                        conditions.append("prefix ~ %s")
                         params.append(
-                            f"{_namespace_to_text(condition.path, handle_wildcards=True)}%"
-                        )
-                    elif condition.match_type == "suffix":
-                        conditions.append("prefix LIKE %s")
-                        params.append(
-                            f"%{_namespace_to_text(condition.path, handle_wildcards=True)}"
+                            _namespace_match_pattern(
+                                condition.path, condition.match_type
+                            )
                         )
                     else:
                         logger.warning(
@@ -1248,15 +1275,59 @@ def _get_index_params(store: Any) -> tuple[str, dict[str, Any]]:
     return kind, sanitized
 
 
-def _namespace_to_text(
-    namespace: tuple[str, ...], handle_wildcards: bool = False
-) -> str:
+def _namespace_to_text(namespace: tuple[str, ...]) -> str:
     """Convert namespace tuple to text string."""
-    if handle_wildcards:
-        namespace = tuple("%" if val == "*" else val for val in namespace)
     return ".".join(namespace)
 
 
+def _escape_like_literal(text: str) -> str:
+    """Escape LIKE metacharacters so `text` is matched literally.
+
+    Namespace labels may contain `_` and `%`, which would otherwise act as
+    wildcards: `("user_1",)` would match `("userX1",)`. Backslash is escaped
+    first so it cannot escape the following character. Requires an explicit
+    `ESCAPE '\\'` clause on the pattern.
+    """
+    return text.replace("\\", "\\\\").replace("%", "\\%").replace("_", "\\_")
+
+
+def _namespace_prefix_condition(namespace_prefix: tuple[str, ...]) -> tuple[str, tuple]:
+    """Build the SQL scoping a search to a namespace and its descendants.
+
+    Matches the namespace exactly or requires the `.` separator before any
+    remainder, so a prefix of `("foo",)` does not also match `("foobar",)`.
+
+    Both arms stay index-friendly: equality on the `(prefix, key)` primary key,
+    the anchored LIKE on the `prefix text_pattern_ops` index.
+
+    Only the LIKE arm is escaped -- equality does not interpret metacharacters,
+    so escaping it would stop `("user_1",)` from matching itself.
+    """
+    path = _namespace_to_text(namespace_prefix)
+    condition = r"(store.prefix = %s OR store.prefix LIKE %s ESCAPE '\')"
+    return condition, (path, f"{_escape_like_literal(path)}.%")
+
+
+def _namespace_match_pattern(path: tuple[str, ...], match_type: str) -> str:
+    """Build a POSIX regex matching the dot-joined prefix on whole segments.
+
+    Needed because `LIKE` cannot express "any character except the separator".
+    Matches how `InMemoryStore` compares namespaces element-wise.
+
+    `*` matches exactly one segment. Prefix matches stay open-ended but must end
+    on a separator; suffix matches anchor at the end and begin on one.
+
+    Examples:
+        prefix ("uid", "*", "alice") -> ^uid\\.[^.]+\\.alice(\\.|\\Z)
+        suffix ("alice",)            -> (^|\\.)alice\\Z
+    """
+    segments = ("[^.]+" if part == "*" else re.escape(part) for part in path)
+    body = r"\.".join(segments)
+    if match_type == "suffix":
+        return rf"(^|\.){body}\Z"
+    return rf"^{body}(\.|\Z)"
+
+
 def _row_to_item(
     namespace: tuple[str, ...],
     row: Row,

libs/checkpoint-postgres/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-postgres"
-version = "3.0.4"
+version = "3.1.2"
 description = "Library with a Postgres implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=2.1.2,<5.0.0",
+  "langgraph-checkpoint>=4.1.0,<5.0.0",
   "orjson>=3.11.5",
   "psycopg>=3.2.0",
   "psycopg-pool>=3.2.0",
@@ -20,7 +20,7 @@ dependencies = [
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-postgres"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 
@@ -32,12 +32,13 @@ test = [
   "pytest-mock",
   "psycopg[binary]",
   "langgraph-checkpoint",
+  "langgraph-checkpoint-conformance",
   "pytest-watcher",
 ]
 lint = [
   "ruff",
   "codespell",
-  "mypy",
+  "ty",
 ]
 dev = [
   {include-group = "test"},
@@ -49,6 +50,7 @@ default-groups = ['dev']
 
 [tool.uv.sources]
 langgraph-checkpoint = { path = "../checkpoint", editable = true }
+langgraph-checkpoint-conformance = { path = "../checkpoint-conformance", editable = true }
 
 [tool.hatch.build.targets.wheel]
 include = ["langgraph"]
@@ -64,20 +66,22 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
+  "PLC0415",  # import-outside-top-level
+  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
 target-version = "py310"
 
-[tool.mypy]
-# https://mypy.readthedocs.io/en/stable/config_file.html
-disallow_untyped_defs = "True"
-explicit_package_bases = "True"
-warn_no_return = "False"
-warn_unused_ignores = "True"
-warn_redundant_casts = "True"
-allow_redefinition = "True"
-disable_error_code = "typeddict-item, return-value"
+[tool.ty.rules]
+invalid-argument-type = "ignore"
+invalid-assignment = "ignore"
+invalid-key = "ignore"
+invalid-return-type = "ignore"
+invalid-typed-dict-field = "ignore"
+invalid-yield = "ignore"
+no-matching-overload = "ignore"
+unused-type-ignore-comment = "ignore"
 
 [tool.pytest-watcher]
 now = true

libs/checkpoint-postgres/tests/test_async.py

@@ -361,9 +361,9 @@ async def test_get_checkpoint_no_channel_values(
 
         load_checkpoint_tuple = saver._load_checkpoint_tuple
 
-        def patched_load_checkpoint_tuple(value):
+        async def patched_load_checkpoint_tuple(value):
             value["checkpoint"].pop("channel_values", None)
-            return load_checkpoint_tuple(value)
+            return await load_checkpoint_tuple(value)
 
         monkeypatch.setattr(
             saver, "_load_checkpoint_tuple", patched_load_checkpoint_tuple
@@ -371,3 +371,49 @@ async def test_get_checkpoint_no_channel_values(
 
         checkpoint = await saver.aget_tuple(config)
         assert checkpoint.checkpoint["channel_values"] == {}
+
+
+@pytest.mark.parametrize("saver_name", ["base", "pool", "pipe"])
+async def test_delta_channel_chain_reconstruction(saver_name: str) -> None:
+    """AsyncPostgresSaver reconstructs DeltaChannel chain via point-lookup traversal."""
+    pytest.importorskip(
+        "langgraph.channels.delta", reason="langgraph core not installed"
+    )
+
+    # Deferred on purpose: langgraph core is not a test dependency of this
+    # package, so these must stay behind the importorskip above.
+    from typing import Annotated  # noqa: PLC0415
+
+    from langchain_core.messages import AIMessage, HumanMessage  # noqa: PLC0415
+    from langgraph.channels.delta import DeltaChannel  # noqa: PLC0415
+    from langgraph.graph import START, StateGraph  # noqa: PLC0415
+    from langgraph.graph.message import _messages_delta_reducer  # noqa: PLC0415
+    from typing_extensions import TypedDict  # noqa: PLC0415
+
+    class State(TypedDict):
+        messages: Annotated[list, DeltaChannel(_messages_delta_reducer)]
+
+    def respond(state: State) -> dict:
+        n = len(state["messages"])
+        return {"messages": [AIMessage(content=f"reply-{n}", id=f"ai-{n}")]}
+
+    builder = StateGraph(State)
+    builder.add_node("respond", respond)
+    builder.add_edge(START, "respond")
+
+    async with _saver(saver_name) as saver:
+        graph = builder.compile(checkpointer=saver)
+        config = {"configurable": {"thread_id": "diff-channel-test-1"}}
+
+        await graph.ainvoke({"messages": [HumanMessage(content="hi", id="h1")]}, config)
+        await graph.ainvoke(
+            {"messages": [HumanMessage(content="there", id="h2")]}, config
+        )
+
+        state = await graph.aget_state(config)
+        msgs = state.values["messages"]
+        assert len(msgs) == 4, f"expected 4, got {len(msgs)}: {msgs}"
+        assert msgs[0].content == "hi"
+        assert msgs[1].content == "reply-1"
+        assert msgs[2].content == "there"
+        assert msgs[3].content == "reply-3"

libs/checkpoint-postgres/tests/test_async_store.py

@@ -20,6 +20,7 @@ from langgraph.store.base import (
 )
 from psycopg import AsyncConnection
 
+from langgraph.checkpoint.postgres import _ainternal
 from langgraph.store.postgres import AsyncPostgresStore
 from tests.conftest import (
     DEFAULT_URI,
@@ -346,6 +347,59 @@ async def test_batch_list_namespaces_ops(store: AsyncPostgresStore) -> None:
     assert ("test", "namespace2") in results[0]
 
 
+@asynccontextmanager
+async def _create_pool_store() -> AsyncIterator[AsyncPostgresStore]:
+    database = f"test_{uuid.uuid4().hex[:16]}"
+    uri_parts = DEFAULT_URI.split("/")
+    uri_base = "/".join(uri_parts[:-1])
+    query_params = ""
+    if "?" in uri_parts[-1]:
+        _, query_params = uri_parts[-1].split("?", 1)
+        query_params = "?" + query_params
+
+    conn_string = f"{uri_base}/{database}{query_params}"
+    admin_conn_string = DEFAULT_URI
+    async with await AsyncConnection.connect(
+        admin_conn_string, autocommit=True
+    ) as conn:
+        await conn.execute(f"CREATE DATABASE {database}")
+    try:
+        async with AsyncPostgresStore.from_conn_string(
+            conn_string, pool_config={"min_size": 1, "max_size": 1}
+        ) as store:
+            await store.setup()
+            yield store
+    finally:
+        async with await AsyncConnection.connect(
+            admin_conn_string, autocommit=True
+        ) as conn:
+            await conn.execute(f"DROP DATABASE {database}")
+
+
+async def test_abatch_uses_single_pool_checkout(monkeypatch) -> None:
+    async with _create_pool_store() as store:
+        await store.aput(("test",), "key1", {"data": "value1"})
+
+        original_get_connection = _ainternal.get_connection
+        checkout_count = 0
+
+        @asynccontextmanager
+        async def counting_get_connection(conn):
+            nonlocal checkout_count
+            checkout_count += 1
+            async with original_get_connection(conn) as checked_out_conn:
+                yield checked_out_conn
+
+        monkeypatch.setattr(_ainternal, "get_connection", counting_get_connection)
+
+        results = await store.abatch([GetOp(namespace=("test",), key="key1")])
+
+        assert len(results) == 1
+        assert results[0] is not None
+        assert results[0].value == {"data": "value1"}
+        assert checkout_count == 1
+
+
 @asynccontextmanager
 async def _create_vector_store(
     vector_type: str,
@@ -685,3 +739,135 @@ async def test_store_ttl(store):
     # Now has been (TTL_SECONDS-2)*2 > TTL_SECONDS + TTL_SECONDS/2
     results = await store.asearch(ns, query="bar", refresh_ttl=False)
     assert len(results) == 0
+
+
+async def _aexpire_now(
+    store: AsyncPostgresStore, ns: tuple[str, ...], key: str
+) -> None:
+    """Backdate a row's expires_at into the past without deleting it (unswept)."""
+    async with store._cursor() as cur:
+        await cur.execute(
+            "UPDATE store SET expires_at = NOW() - INTERVAL '1 minute' "
+            "WHERE prefix = %s AND key = %s",
+            (".".join(ns), key),
+        )
+
+
+async def _arow_exists(
+    store: AsyncPostgresStore, ns: tuple[str, ...], key: str
+) -> bool:
+    async with store._cursor() as cur:
+        await cur.execute(
+            "SELECT COUNT(*) AS n FROM store WHERE prefix = %s AND key = %s",
+            (".".join(ns), key),
+        )
+        return (await cur.fetchone())["n"] == 1
+
+
+async def _astored_expires_at(store: AsyncPostgresStore, ns: tuple[str, ...], key: str):
+    async with store._cursor() as cur:
+        await cur.execute(
+            "SELECT expires_at FROM store WHERE prefix = %s AND key = %s",
+            (".".join(ns), key),
+        )
+        return (await cur.fetchone())["expires_at"]
+
+
+async def test_omit_expired_filters_read_paths(store: AsyncPostgresStore) -> None:
+    await store.stop_ttl_sweeper()  # deterministic: no background deletion
+    store.ttl_config["omit_expired"] = True
+
+    expired_ns = ("omit", "expired")
+    control_ns = ("omit", "control")
+    await store.aput(expired_ns, "e", {"data": "gone"}, ttl=TTL_MINUTES)
+    await store.aput(control_ns, "c", {"data": "keep"}, ttl=None)
+    await _aexpire_now(store, expired_ns, "e")
+
+    # The row is expired but physically still present (unswept).
+    assert await _arow_exists(store, expired_ns, "e")
+
+    # aget omits it; the never-expiring control is still returned.
+    assert await store.aget(expired_ns, "e") is None
+    assert await store.aget(control_ns, "c") is not None
+
+    # asearch omits it but returns the control.
+    assert await store.asearch(expired_ns) == []
+    assert [i.key for i in await store.asearch(control_ns)] == ["c"]
+
+    # alist_namespaces drops the expired-only namespace, keeps the control.
+    namespaces = await store.alist_namespaces(prefix=("omit",))
+    assert expired_ns not in namespaces
+    assert control_ns in namespaces
+
+
+@pytest.mark.parametrize("omit", [None, False], ids=["default", "explicit-false"])
+async def test_omit_expired_disabled_preserves_expired_rows(
+    store: AsyncPostgresStore, omit
+) -> None:
+    await store.stop_ttl_sweeper()
+    if omit is not None:
+        store.ttl_config["omit_expired"] = omit
+
+    ns = ("keep",)
+    await store.aput(ns, "k", {"data": "still-here"}, ttl=TTL_MINUTES)
+    await _aexpire_now(store, ns, "k")
+
+    assert await store.aget(ns, "k", refresh_ttl=False) is not None
+    assert [i.key for i in await store.asearch(ns, refresh_ttl=False)] == ["k"]
+    assert ns in await store.alist_namespaces(prefix=("keep",))
+
+
+async def test_omit_expired_refresh_ttl_only_refreshes_live_rows(
+    store: AsyncPostgresStore,
+) -> None:
+    await store.stop_ttl_sweeper()
+    store.ttl_config["omit_expired"] = True
+
+    ns = ("refresh",)
+    await store.aput(ns, "expired", {"n": 0}, ttl=TTL_MINUTES)
+    await store.aput(ns, "live_get", {"n": 1}, ttl=TTL_MINUTES)
+    await store.aput(ns, "live_search", {"n": 2}, ttl=TTL_MINUTES)
+    await _aexpire_now(store, ns, "expired")
+
+    expired_before = await _astored_expires_at(store, ns, "expired")
+    get_before = await _astored_expires_at(store, ns, "live_get")
+    search_before = await _astored_expires_at(store, ns, "live_search")
+
+    # refresh_ttl=True must NOT resurrect the expired row (via aget or asearch)...
+    assert await store.aget(ns, "expired", refresh_ttl=True) is None
+    live_keys = [i.key for i in await store.asearch(ns, refresh_ttl=True)]
+    assert "expired" not in live_keys
+    assert await _astored_expires_at(store, ns, "expired") == expired_before
+
+    # ...but must still extend the live rows that were read.
+    assert await store.aget(ns, "live_get", refresh_ttl=True) is not None
+    assert await _astored_expires_at(store, ns, "live_get") > get_before
+    assert await _astored_expires_at(store, ns, "live_search") > search_before
+
+
+async def test_omit_expired_search_pagination(store: AsyncPostgresStore) -> None:
+    await store.stop_ttl_sweeper()
+    store.ttl_config["omit_expired"] = True
+
+    ns = ("page",)
+    for k in ("a", "b", "c"):
+        await store.aput(ns, k, {"k": k}, ttl=TTL_MINUTES)
+    await store.aput(ns, "expired", {"k": "x"}, ttl=TTL_MINUTES)
+    await _aexpire_now(store, ns, "expired")
+
+    seconds_ago = {"a": 1, "expired": 2, "b": 3, "c": 4}
+    # updated_at DESC orders these a, expired, b, c, so the expired row sits inside
+    # the first limit=2 window. Correct (pre-LIMIT) filtering yields live pages
+    # [a, b] then [c]; post-LIMIT filtering would underfill page 1 to just [a].
+    async with store._cursor() as cur:
+        for key, secs in seconds_ago.items():
+            await cur.execute(
+                "UPDATE store SET updated_at = NOW() - (%s * INTERVAL '1 second') "
+                "WHERE prefix = %s AND key = %s",
+                (secs, ".".join(ns), key),
+            )
+
+    page1 = await store.asearch(ns, limit=2, offset=0)
+    page2 = await store.asearch(ns, limit=2, offset=2)
+    assert [i.key for i in page1] == ["a", "b"]
+    assert [i.key for i in page2] == ["c"]

libs/checkpoint-postgres/tests/test_conformance_delta.py

@@ -0,0 +1,30 @@
+"""Run delta-channel conformance capabilities against AsyncPostgresSaver."""
+
+from __future__ import annotations
+
+import pytest
+from langgraph.checkpoint.conformance import validate
+from langgraph.checkpoint.conformance.initializer import checkpointer_test
+
+from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
+from tests.conftest import DEFAULT_URI
+
+
+@pytest.mark.asyncio
+async def test_delta_channel_conformance():
+    @checkpointer_test(name="AsyncPostgresSaver")
+    async def postgres_saver():
+        async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+            await saver.setup()
+            yield saver
+
+    report = await validate(
+        postgres_saver,
+        capabilities={
+            "delta_channel_history",
+        },
+    )
+    for cap, result in report.results.items():
+        if result.passed is False:
+            details = "\n".join(result.failures or [])
+            pytest.fail(f"Capability {cap} failed:\n{details}")

libs/checkpoint-postgres/tests/test_delta_plain_value_seed.py

@@ -0,0 +1,204 @@
+"""Seed detection for `DeltaChannel` histories on Postgres.
+
+`put` splits stored values in two: primitives stay inline in the checkpoint's
+`channel_values`, everything else moves to `checkpoint_blobs`. Only
+`_DeltaSnapshot` leaves an inline marker behind when it moves, so the stage-1
+walk has to check both places — a blob probe alone misses inline primitives, and
+an inline-key check alone missed blob-stored plain values, which is what a thread
+migrated from a pre-delta channel type leaves behind. See #8534.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+from uuid import uuid4
+
+import pytest
+from langgraph.checkpoint.base import Checkpoint, empty_checkpoint
+from langgraph.checkpoint.base.id import uuid6
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+
+from langgraph.checkpoint.postgres.aio import AsyncPostgresSaver
+from tests.conftest import DEFAULT_URI
+
+CHANNEL = "items"
+
+
+async def _build_chain(saver: AsyncPostgresSaver, seed_value: Any) -> tuple[str, dict]:
+    """Store `seed_value` at step 1, then two steps that store nothing.
+
+    Every step carries a write so the walk has something to collect.
+    Returns `(thread_id, head_config)`.
+    """
+    thread_id = str(uuid4())
+    parent: dict | None = None
+    for step in range(4):
+        config: dict = {"configurable": {"thread_id": thread_id, "checkpoint_ns": ""}}
+        if parent is not None:
+            config["configurable"]["checkpoint_id"] = parent["configurable"][
+                "checkpoint_id"
+            ]
+        cp: Checkpoint = empty_checkpoint()
+        cp["id"] = str(uuid6(clock_seq=step))
+        new_versions: dict[str, Any] = {}
+        if step == 1:
+            cp["channel_values"][CHANNEL] = seed_value
+            cp["channel_versions"][CHANNEL] = "v1"
+            new_versions[CHANNEL] = "v1"
+        else:
+            cp["channel_versions"][CHANNEL] = f"v{step}"
+        parent = await saver.aput(
+            config, cp, {"source": "loop", "step": step, "parents": {}}, new_versions
+        )
+        await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
+    assert parent is not None
+    return thread_id, parent
+
+
+@pytest.mark.asyncio
+async def test_plain_value_seed_is_found() -> None:
+    """A pre-delta plain value must be located as the seed.
+
+    Before #8534 the walk ran to the root and returned no seed, which happens
+    to reconstruct correctly for additive reducers while costing an
+    O(thread length) replay on every read.
+    """
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+        _, head = await _build_chain(saver, [10, 20])
+
+        result = await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
+        entry = result[CHANNEL]
+
+        assert entry.get("seed") == [10, 20], (
+            f"expected the plain value as seed, got {entry.get('seed', '<missing>')}"
+        )
+        # Only the writes between the seed and the head's parent replay: step 1
+        # (the seed's own) and step 2. Step 0 is older than the seed, step 3 is
+        # pending at the head.
+        assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
+
+
+@pytest.mark.asyncio
+async def test_delta_snapshot_seed_is_found() -> None:
+    """The `_DeltaSnapshot` path keeps working, so both seed kinds agree."""
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+        _, head = await _build_chain(saver, _DeltaSnapshot([10, 20]))
+
+        result = await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
+        entry = result[CHANNEL]
+
+        seed = entry.get("seed")
+        assert isinstance(seed, _DeltaSnapshot), f"expected a snapshot, got {seed!r}"
+        assert seed.value == [10, 20]
+        assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
+
+
+@pytest.mark.asyncio
+async def test_version_bump_without_a_value_does_not_hide_an_older_seed() -> None:
+    """A delta-era step bumps `channel_versions` without storing a value, so no
+    blob exists for that version. The probe must report no seed there and keep
+    walking rather than stopping at a version it cannot resolve.
+
+    Step 0 holds the real value; step 1 bumps the version with nothing stored.
+    Walking back from the head has to pass step 1 to reach step 0.
+    """
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+        thread_id = str(uuid4())
+        parent: dict | None = None
+        for step in range(4):
+            config: dict = {
+                "configurable": {"thread_id": thread_id, "checkpoint_ns": ""}
+            }
+            if parent is not None:
+                config["configurable"]["checkpoint_id"] = parent["configurable"][
+                    "checkpoint_id"
+                ]
+            cp: Checkpoint = empty_checkpoint()
+            cp["id"] = str(uuid6(clock_seq=step))
+            new_versions: dict[str, Any] = {}
+            if step == 0:
+                cp["channel_values"][CHANNEL] = [10, 20]
+                cp["channel_versions"][CHANNEL] = "v0"
+                new_versions[CHANNEL] = "v0"
+            elif step == 1:
+                # Version bumped, value absent -> no blob row written.
+                cp["channel_versions"][CHANNEL] = "v1"
+                new_versions[CHANNEL] = "v1"
+            else:
+                cp["channel_versions"][CHANNEL] = "v1"
+            parent = await saver.aput(
+                config,
+                cp,
+                {"source": "loop", "step": step, "parents": {}},
+                new_versions,
+            )
+            await saver.aput_writes(parent, [(CHANNEL, f"w{step}")], str(uuid4()))
+        assert parent is not None
+
+        result = await saver.aget_delta_channel_history(
+            config=parent, channels=[CHANNEL]
+        )
+        entry = result[CHANNEL]
+
+        assert entry.get("seed") == [10, 20], (
+            "the walk stopped at the empty blob instead of reaching the real "
+            f"value at step 0; got {entry.get('seed', '<missing>')}"
+        )
+        assert [w[2] for w in entry["writes"]] == ["w0", "w1", "w2"]
+
+
+@pytest.mark.asyncio
+async def test_inline_primitive_seed_is_found() -> None:
+    """`put` keeps `None`, `str`, `int`, `float` and `bool` in the checkpoint's
+    own `channel_values` with no blob row, so a blob probe alone cannot see
+    them. Stage 1 reads the inline value too and uses it when there is no blob.
+    """
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+        for seed_value in (42, "x", 3.5, None):
+            _, head = await _build_chain(saver, seed_value)
+            entry = (
+                await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
+            )[CHANNEL]
+            if seed_value is None:
+                # A JSON null is indistinguishable from "no value stored", so
+                # the walk keeps going; replay from empty is the correct result.
+                assert "seed" not in entry
+            else:
+                assert entry.get("seed") == seed_value, (
+                    f"inline {type(seed_value).__name__} seed not found: "
+                    f"{entry.get('seed', '<missing>')!r}"
+                )
+                assert [w[2] for w in entry["writes"]] == ["w1", "w2"]
+
+
+@pytest.mark.asyncio
+async def test_inline_true_is_not_read_as_a_snapshot_marker() -> None:
+    """`put` inlines a literal `true` in `channel_values` as the marker for a
+    `_DeltaSnapshot`, which is also what a genuine `bool` channel holding
+    `True` looks like. A blob exists only in the snapshot case, so preferring
+    the blob keeps the two apart.
+    """
+    async with AsyncPostgresSaver.from_conn_string(DEFAULT_URI) as saver:
+        await saver.setup()
+
+        _, head = await _build_chain(saver, True)
+        entry = (
+            await saver.aget_delta_channel_history(config=head, channels=[CHANNEL])
+        )[CHANNEL]
+        assert entry.get("seed") is True, (
+            f"a real inline True must survive, got {entry.get('seed', '<missing>')!r}"
+        )
+
+        _, snap_head = await _build_chain(saver, _DeltaSnapshot(True))
+        snap_entry = (
+            await saver.aget_delta_channel_history(config=snap_head, channels=[CHANNEL])
+        )[CHANNEL]
+        seed = snap_entry.get("seed")
+        assert isinstance(seed, _DeltaSnapshot), (
+            f"the marker must resolve to the blob, not inline true; got {seed!r}"
+        )
+        assert seed.value is True

libs/checkpoint-postgres/tests/test_store.py

@@ -20,6 +20,10 @@ from langgraph.store.base import (
 from psycopg import Connection
 
 from langgraph.store.postgres import PostgresStore
+from langgraph.store.postgres.base import (
+    _escape_like_literal,
+    _namespace_match_pattern,
+)
 from tests.conftest import (
     DEFAULT_URI,
     VECTOR_TYPES,
@@ -326,6 +330,127 @@ def test_list_namespaces(store) -> None:
         store.delete(namespace, "dummy")
 
 
+def test_escape_like_literal() -> None:
+    assert _escape_like_literal("users.alice") == "users.alice"
+    assert _escape_like_literal("user_1") == r"user\_1"
+    assert _escape_like_literal("100%") == r"100\%"
+    assert _escape_like_literal("a\\b") == "a\\\\b"
+    assert _escape_like_literal("") == ""
+
+
+def test_namespace_match_pattern() -> None:
+    assert _namespace_match_pattern(("foo",), "prefix") == r"^foo(\.|\Z)"
+    assert _namespace_match_pattern(("uid", "users"), "prefix") == r"^uid\.users(\.|\Z)"
+    assert (
+        _namespace_match_pattern(("uid", "*", "alice"), "prefix")
+        == r"^uid\.[^.]+\.alice(\.|\Z)"
+    )
+    assert _namespace_match_pattern(("alice",), "suffix") == r"(^|\.)alice\Z"
+
+    # Regex metacharacters in a label are quoted, not interpreted.
+    pattern = _namespace_match_pattern(("a.b+c",), "prefix")
+    assert re.match(pattern, "a.b+c.child")
+    assert not re.match(pattern, "axbbbc")
+
+
+def test_search_namespace_segment_boundary(store) -> None:
+    """Prefix scoping must stop at namespace segment boundaries.
+
+    Namespaces are stored dot-joined, so matching the raw text also returns
+    siblings sharing leading characters. Callers isolate tenants by namespace,
+    so prefix-shaped ids (1 vs 12) would cross-read.
+    """
+    for namespace in [
+        ("foo",),
+        ("foo", "child"),
+        ("foo", "child", "deep"),
+        ("foobar",),
+        ("foobar", "baz"),
+        ("foo2",),
+    ]:
+        store.put(namespace, "k", {"v": 1})
+
+    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
+        return {item.namespace for item in store.search(prefix, limit=100)}
+
+    assert _namespaces(("foo",)) == {
+        ("foo",),
+        ("foo", "child"),
+        ("foo", "child", "deep"),
+    }
+    # The sibling scope is independent, not merely narrower.
+    assert _namespaces(("foobar",)) == {("foobar",), ("foobar", "baz")}
+    assert _namespaces(("foo", "child")) == {("foo", "child"), ("foo", "child", "deep")}
+    assert _namespaces(("foo2",)) == {("foo2",)}
+    assert _namespaces(("fo",)) == set()
+
+
+def test_search_empty_prefix_is_unconstrained(store) -> None:
+    """An empty prefix constrains nothing and must return every namespace."""
+    for namespace in [("a",), ("b", "c"), ("d", "e", "f")]:
+        store.put(namespace, "k", {"v": 1})
+
+    assert {item.namespace for item in store.search((), limit=100)} == {
+        ("a",),
+        ("b", "c"),
+        ("d", "e", "f"),
+    }
+
+
+def test_search_namespace_like_metacharacters(store) -> None:
+    """`_` and `%` are legal namespace labels, not LIKE wildcards."""
+    for namespace in [
+        ("user_1",),
+        ("user_1", "child"),
+        ("userX1",),
+        ("a%b",),
+        ("axxb",),
+    ]:
+        store.put(namespace, "k", {"v": 1})
+
+    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
+        return {item.namespace for item in store.search(prefix, limit=100)}
+
+    # Also asserts the namespace still matches itself, which catches escaping
+    # the equality arm by mistake.
+    assert _namespaces(("user_1",)) == {("user_1",), ("user_1", "child")}
+    assert _namespaces(("a%b",)) == {("a%b",)}
+
+
+def test_list_namespaces_segment_boundary(store) -> None:
+    for namespace in [
+        ("foo",),
+        ("foo", "child"),
+        ("foobar",),
+        ("foobar", "baz"),
+        ("uid", "users", "alice"),
+        ("uid", "users", "malice"),
+        ("uid", "a", "b", "alice"),
+    ]:
+        store.put(namespace, "k", {"v": 1})
+
+    assert set(store.list_namespaces(prefix=["foo"], limit=100)) == {
+        ("foo",),
+        ("foo", "child"),
+    }
+    # Suffix must align to a segment: "malice" does not end with the "alice"
+    # segment.
+    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
+        ("uid", "users", "alice"),
+        ("uid", "a", "b", "alice"),
+    }
+    # "*" spans exactly one segment.
+    assert set(store.list_namespaces(prefix=["uid", "*", "alice"], limit=100)) == {
+        ("uid", "users", "alice"),
+    }
+    # Prefix matching stays open-ended across depth.
+    assert set(store.list_namespaces(prefix=["uid"], limit=100)) == {
+        ("uid", "users", "alice"),
+        ("uid", "users", "malice"),
+        ("uid", "a", "b", "alice"),
+    }
+
+
 def test_search(store) -> None:
     # Create test data
     test_data = [
@@ -863,6 +988,133 @@ def test_store_ttl(store):
     assert len(res) == 0
 
 
+def _expire_now(store: PostgresStore, ns: tuple[str, ...], key: str) -> None:
+    """Backdate a row's expires_at into the past without deleting it (unswept)."""
+    with store._cursor() as cur:
+        cur.execute(
+            "UPDATE store SET expires_at = NOW() - INTERVAL '1 minute' "
+            "WHERE prefix = %s AND key = %s",
+            (".".join(ns), key),
+        )
+
+
+def _row_exists(store: PostgresStore, ns: tuple[str, ...], key: str) -> bool:
+    with store._cursor() as cur:
+        cur.execute(
+            "SELECT COUNT(*) AS n FROM store WHERE prefix = %s AND key = %s",
+            (".".join(ns), key),
+        )
+        return cur.fetchone()["n"] == 1
+
+
+def _stored_expires_at(store: PostgresStore, ns: tuple[str, ...], key: str):
+    with store._cursor() as cur:
+        cur.execute(
+            "SELECT expires_at FROM store WHERE prefix = %s AND key = %s",
+            (".".join(ns), key),
+        )
+        return cur.fetchone()["expires_at"]
+
+
+def test_omit_expired_filters_read_paths(store: PostgresStore) -> None:
+    store.stop_ttl_sweeper()  # deterministic: no background deletion
+    store.ttl_config["omit_expired"] = True
+
+    expired_ns = ("omit", "expired")
+    control_ns = ("omit", "control")
+    store.put(expired_ns, "e", {"data": "gone"}, ttl=TTL_MINUTES)
+    store.put(control_ns, "c", {"data": "keep"}, ttl=None)
+    _expire_now(store, expired_ns, "e")
+
+    # The row is expired but physically still present (unswept).
+    assert _row_exists(store, expired_ns, "e")
+
+    # get omits it; the never-expiring control is still returned.
+    assert store.get(expired_ns, "e") is None
+    assert store.get(control_ns, "c") is not None
+
+    # search omits it but returns the control.
+    assert store.search(expired_ns) == []
+    assert [i.key for i in store.search(control_ns)] == ["c"]
+
+    # list_namespaces drops the expired-only namespace, keeps the control.
+    namespaces = store.list_namespaces(prefix=("omit",))
+    assert expired_ns not in namespaces
+    assert control_ns in namespaces
+
+
+@pytest.mark.parametrize("omit", [None, False], ids=["default", "explicit-false"])
+def test_omit_expired_disabled_preserves_expired_rows(
+    store: PostgresStore, omit
+) -> None:
+    store.stop_ttl_sweeper()
+    if omit is not None:
+        store.ttl_config["omit_expired"] = omit
+
+    ns = ("keep",)
+    store.put(ns, "k", {"data": "still-here"}, ttl=TTL_MINUTES)
+    _expire_now(store, ns, "k")
+
+    assert store.get(ns, "k", refresh_ttl=False) is not None
+    assert [i.key for i in store.search(ns, refresh_ttl=False)] == ["k"]
+    assert ns in store.list_namespaces(prefix=("keep",))
+
+
+def test_omit_expired_refresh_ttl_only_refreshes_live_rows(
+    store: PostgresStore,
+) -> None:
+    store.stop_ttl_sweeper()
+    store.ttl_config["omit_expired"] = True
+
+    ns = ("refresh",)
+    store.put(ns, "expired", {"n": 0}, ttl=TTL_MINUTES)
+    store.put(ns, "live_get", {"n": 1}, ttl=TTL_MINUTES)
+    store.put(ns, "live_search", {"n": 2}, ttl=TTL_MINUTES)
+    _expire_now(store, ns, "expired")
+
+    expired_before = _stored_expires_at(store, ns, "expired")
+    get_before = _stored_expires_at(store, ns, "live_get")
+    search_before = _stored_expires_at(store, ns, "live_search")
+
+    # refresh_ttl=True must NOT resurrect the expired row (via get or search)...
+    assert store.get(ns, "expired", refresh_ttl=True) is None
+    assert "expired" not in [i.key for i in store.search(ns, refresh_ttl=True)]
+    assert _stored_expires_at(store, ns, "expired") == expired_before
+
+    # ...but must still extend the live rows that were read.
+    assert store.get(ns, "live_get", refresh_ttl=True) is not None
+    assert _stored_expires_at(store, ns, "live_get") > get_before
+    assert _stored_expires_at(store, ns, "live_search") > search_before
+
+
+def test_omit_expired_search_pagination(store: PostgresStore) -> None:
+    store.stop_ttl_sweeper()
+    store.ttl_config["omit_expired"] = True
+
+    ns = ("page",)
+    for k in ("a", "b", "c"):
+        store.put(ns, k, {"k": k}, ttl=TTL_MINUTES)
+    store.put(ns, "expired", {"k": "x"}, ttl=TTL_MINUTES)
+    _expire_now(store, ns, "expired")
+
+    seconds_ago = {"a": 1, "expired": 2, "b": 3, "c": 4}
+    # updated_at DESC orders these a, expired, b, c, so the expired row sits inside
+    # the first limit=2 window. Correct (pre-LIMIT) filtering yields live pages
+    # [a, b] then [c]; post-LIMIT filtering would underfill page 1 to just [a].
+    with store._cursor() as cur:
+        for key, secs in seconds_ago.items():
+            cur.execute(
+                "UPDATE store SET updated_at = NOW() - (%s * INTERVAL '1 second') "
+                "WHERE prefix = %s AND key = %s",
+                (secs, ".".join(ns), key),
+            )
+
+    page1 = store.search(ns, limit=2, offset=0)
+    page2 = store.search(ns, limit=2, offset=2)
+    assert [i.key for i in page1] == ["a", "b"]
+    assert [i.key for i in page2] == ["c"]
+
+
 @pytest.mark.parametrize(
     "vector_type,distance_type",
     [
@@ -899,3 +1151,16 @@ def test_non_ascii(
         assert result3[0].key == "3"
         assert result4[0].key == "4"
         assert result5[0].key == "5"
+
+
+def test_namespace_labels_with_trailing_newline(store) -> None:
+    """Labels may contain newlines, and must not match a differently-named label."""
+    store.put(("users", "alice"), "k", {"v": 1})
+    store.put(("users", "alice\n"), "k", {"v": 2})
+
+    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
+        ("users", "alice"),
+    }
+    assert set(store.list_namespaces(prefix=["users", "alice"], limit=100)) == {
+        ("users", "alice"),
+    }

libs/checkpoint-sqlite/Makefile

@@ -18,22 +18,19 @@ test_watch:
 
 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
-MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph
 lint_tests: PYTHON_FILES=tests
-lint_tests: MYPY_CACHE=.mypy_cache_test
 
 lint lint_diff lint_package lint_tests:
 	uv run ruff check .
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff format $(PYTHON_FILES) --diff
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
-	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run ty check $(PYTHON_FILES)
 
 type:
-	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	uv run ty check $(PYTHON_FILES)
 
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)

libs/checkpoint-sqlite/README.md

@@ -1,6 +1,31 @@
 # LangGraph SQLite Checkpoint
 
-Implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via `aiosqlite`)
+[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint-sqlite?label=%20)](https://pypi.org/project/langgraph-checkpoint-sqlite/#history)
+[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint-sqlite)](https://opensource.org/licenses/MIT)
+[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint-sqlite)](https://pypistats.org/packages/langgraph-checkpoint-sqlite)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
+
+To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
+[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
+
+## Quick Install
+
+```bash
+uv add langgraph-checkpoint-sqlite
+```
+
+## 🤔 What is this?
+
+This library provides a SQLite implementation of LangGraph's checkpoint saver, with both sync and async support via `aiosqlite`. Use it when you want LangGraph state persistence backed by SQLite for local development, testing, or lightweight deployments.
+
+## 📖 Documentation
+
+For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph.checkpoint.sqlite). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
+
+## Security
+
+> [!IMPORTANT]
+> Set `LANGGRAPH_STRICT_MSGPACK=true` or pass an explicit `allowed_msgpack_modules` list when creating your checkpointer. This restricts checkpoint deserialization to known-safe types, preventing code execution if the database is compromised. See the [langgraph-checkpoint README](https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint#serde) for details.
 
 ## Usage
 
@@ -86,3 +111,13 @@ async with AsyncSqliteSaver.from_conn_string(":memory:") as checkpointer:
     # list checkpoints
     [c async for c in checkpointer.alist(read_config)]
 ```
+
+## 📕 Releases & Versioning
+
+See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
+
+## 💁 Contributing
+
+As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
+
+For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).

libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/__init__.py

@@ -4,7 +4,7 @@ import json
 import random
 import sqlite3
 import threading
-from collections.abc import AsyncIterator, Iterator, Sequence
+from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
 from contextlib import closing, contextmanager
 from typing import Any, cast
 
@@ -16,12 +16,19 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     SerializerProtocol,
     get_checkpoint_id,
     get_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
 
+from langgraph.checkpoint.sqlite._delta import (
+    DELTA_STAGE1_SQL,
+    build_delta_channels_writes_history,
+    build_delta_stage2_sql,
+    step_walk_with_row,
+)
 from langgraph.checkpoint.sqlite.utils import search_where
 
 _AIO_ERROR_MSG = (
@@ -70,7 +77,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
         >>> result = graph.invoke(3, config)
         >>> graph.get_state(config)
         StateSnapshot(values=4, next=(), config={'configurable': {'thread_id': '1', 'checkpoint_ns': '', 'checkpoint_id': '0c62ca34-ac19-445d-bbb0-5b4984975b2a'}}, parent_config=None)
-    """  # noqa
+    """
 
     conn: sqlite3.Connection
     is_setup: bool
@@ -215,7 +222,7 @@ class SqliteSaver(BaseCheckpointSaver[str]):
             >>> checkpoint_tuple = memory.get_tuple(config)
             >>> print(checkpoint_tuple)
             CheckpointTuple(...)
-        """  # noqa
+        """
         checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
         with self.cursor(transaction=False) as cur:
             # find the latest checkpoint for the thread_id
@@ -493,6 +500,88 @@ class SqliteSaver(BaseCheckpointSaver[str]):
                 (str(thread_id),),
             )
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.get_delta_channel_history`.
+
+        Two-stage query:
+
+        * Stage 1 (paged): newest-first slice of `checkpoints` returning
+          `(checkpoint_id, parent_checkpoint_id, type, checkpoint)` per
+          ancestor. Sqlite has no JSONB, so we ship the full serialized
+          checkpoint blob and inspect `channel_values` in Python. Pages
+          newest-first by `checkpoint_id` with a `< cursor` predicate;
+          page size is `DELTA_PAGE_SIZE`. Stops paging when every channel
+          has found its seed or the chain is exhausted.
+
+        * Stage 2 (per-channel UNION ALL): one branch per channel reading
+          `writes` filtered to that channel's specific `chain_cids`. No
+          separate seed-blob fetch — sqlite stores `channel_values` inline
+          in the checkpoint blob, so seeds come back from stage 1.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        thread_id = str(config["configurable"]["thread_id"])
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = self.get_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
+        seed_val_by_ch: dict[str, Any] = {}
+        walk_state: dict[str, Any] = {}
+        seeded: set[str] = set()
+
+        with self.cursor(transaction=False) as cur:
+            cur.execute(DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id))
+            for row in cur:
+                cid, parent_cid, type_tag, blob = row
+                if step_walk_with_row(
+                    cid=cid,
+                    parent_cid=parent_cid,
+                    type_tag=type_tag,
+                    blob=blob,
+                    target_id=checkpoint_id,
+                    serde=self.serde,
+                    chain_by_ch=chain_by_ch,
+                    seed_val_by_ch=seed_val_by_ch,
+                    walk_state=walk_state,
+                    seeded=seeded,
+                    channels=channels,
+                ):
+                    break
+
+            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+            stage2_sql = build_delta_stage2_sql(
+                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
+            )
+            if stage2_sql:
+                stage2_params: list[Any] = []
+                for ch in channels_with_chain:
+                    stage2_params.extend(
+                        [thread_id, checkpoint_ns, ch, *chain_by_ch[ch]]
+                    )
+                cur.execute(stage2_sql, stage2_params)
+                stage2_rows = cast(
+                    "list[tuple[str, str, str, int, str, bytes]]", cur.fetchall()
+                )
+            else:
+                stage2_rows = []
+
+        return build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_val_by_ch=seed_val_by_ch,
+            seeded=seeded,
+            stage2_rows=stage2_rows,
+            serde=self.serde,
+        )
+
     async def aget_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the database asynchronously.
 

libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/_delta.py

@@ -0,0 +1,172 @@
+"""Shared helpers for `get_delta_channel_history` on sqlite savers.
+
+Mirrors the two-stage shape of `BasePostgresSaver` (ancestor walk +
+per-channel UNION ALL writes fetch), but adapted for sqlite's
+constraints. The structural differences:
+
+* No JSONB — to inspect `channel_values` for a checkpoint we must
+  deserialize the full blob. Stage 1 streams the cursor row-by-row and
+  deserializes only the rows the merged walk visits, freeing each blob
+  before advancing.
+* No separate blob table — `channel_values` lives inline in the
+  checkpoint, so seeds come back from stage 1 with no second fetch.
+* Single merged walk (not K independent walks): each visited cid is
+  deserialized exactly once, regardless of how many channels are still
+  seeking their seed.
+
+The streaming design keeps peak in-flight memory at roughly one
+deserialized checkpoint at a time, instead of holding the entire
+ancestor chain's worth of raw blobs as a `fetchall()`-materialized list.
+"""
+
+from __future__ import annotations
+
+from collections.abc import Mapping, Sequence
+from typing import Any
+
+from langgraph.checkpoint.base import DeltaChannelHistory, PendingWrite
+
+# Stage 1 streams ancestors of `target_cid` newest-first. The `<=`
+# predicate keeps target itself in the stream so we can read its
+# `parent_checkpoint_id` from the first row without a separate lookup;
+# the caller skips target's own writes/seed (matches the
+# `BaseCheckpointSaver` contract).
+DELTA_STAGE1_SQL = (
+    "SELECT checkpoint_id, parent_checkpoint_id, type, checkpoint "
+    "FROM checkpoints "
+    "WHERE thread_id = ? AND checkpoint_ns = ? AND checkpoint_id <= ? "
+    "ORDER BY checkpoint_id DESC"
+)
+
+
+def build_delta_stage2_sql(*, chain_lens: Sequence[int]) -> str:
+    """Stage-2 per-channel UNION ALL fetching writes from `writes`.
+
+    One branch per channel with a non-empty chain. Each branch inlines its
+    own `IN (?, ?, ...)` placeholder list because sqlite has no array-bind
+    equivalent of postgres's `= ANY(%s)`. Caller passes parameters in
+    matching order: `[thread_id, checkpoint_ns, channel, *chain_cids]` per
+    branch.
+
+    Returns an empty string when no channel has a chain (caller skips
+    executing in that case). Per-channel UNION ALL avoids the over-fetch
+    of a single `channel = ANY(channels)` filter when channels have
+    different chain depths — same rationale as postgres.
+    """
+    branches: list[str] = []
+    for n in chain_lens:
+        cid_placeholders = ",".join("?" * n)
+        branches.append(
+            "SELECT checkpoint_id, channel, task_id, idx, type, value "
+            "FROM writes "
+            "WHERE thread_id = ? AND checkpoint_ns = ? AND channel = ? "
+            f"AND checkpoint_id IN ({cid_placeholders})"
+        )
+    return " UNION ALL ".join(branches)
+
+
+def step_walk_with_row(
+    *,
+    cid: str,
+    parent_cid: str | None,
+    type_tag: str,
+    blob: bytes,
+    target_id: str,
+    serde: Any,
+    chain_by_ch: dict[str, list[str]],
+    seed_val_by_ch: dict[str, Any],
+    walk_state: dict[str, Any],
+    seeded: set[str],
+    channels: Sequence[str],
+) -> bool:
+    """Process one streamed stage-1 row in the merged ancestor walk.
+
+    The cursor returns (cid, parent_cid, type, blob) rows in
+    `checkpoint_id` DESC order starting at target. The first row is
+    target itself; we read its parent_cid to seed the walk and otherwise
+    skip it (target's own writes/seed are not part of the contract).
+
+    For each subsequent row, if `cid` matches the walk's current
+    position, we deserialize the blob, append the cid to every
+    not-yet-seeded channel's chain, and check `channel_values` for
+    seeds. The deserialized checkpoint is dropped before advancing — no
+    cross-row cache, so peak in-flight is one deserialized checkpoint.
+
+    Off-path rows (different branch on the same thread) advance the
+    cursor without doing any work.
+
+    Returns True when every requested channel is seeded — the caller
+    can stop iterating and close the cursor.
+    """
+    if "started" not in walk_state:
+        if cid == target_id:
+            walk_state["started"] = True
+            walk_state["cur_cid"] = parent_cid
+            walk_state["active"] = {ch for ch in channels if ch not in seeded}
+        # Not target yet (or target not present): keep streaming.
+        return False
+    active: set[str] = walk_state["active"]
+    if not active:
+        return True
+    if cid != walk_state["cur_cid"]:
+        # Off-path row from a sibling branch — skip without deserializing.
+        return False
+    for ch in active:
+        chain_by_ch[ch].append(cid)
+    ckpt = serde.loads_typed((type_tag, blob))
+    channel_values: Mapping[str, Any] = ckpt.get("channel_values") or {}
+    for ch in [ch for ch in active if ch in channel_values]:
+        seed_val_by_ch[ch] = channel_values[ch]
+        seeded.add(ch)
+        active.discard(ch)
+    del ckpt, channel_values
+    walk_state["cur_cid"] = parent_cid
+    return not active
+
+
+def build_delta_channels_writes_history(
+    *,
+    channels: Sequence[str],
+    chain_by_ch: Mapping[str, list[str]],
+    seed_val_by_ch: Mapping[str, Any],
+    seeded: set[str],
+    stage2_rows: Sequence[tuple[str, str, str, int, str, bytes]],
+    serde: Any,
+) -> dict[str, DeltaChannelHistory]:
+    """Demux stage-2 rows per channel; produce per-channel histories.
+
+    Stage-2 rows are `(checkpoint_id, channel, task_id, idx, type, value)`.
+    Final write order is oldest→newest globally and `(task_id, idx)` within
+    a checkpoint, matching the contract on `DeltaChannelHistory.writes`.
+
+    `seed` is omitted when the walk reached a true root with no snapshot
+    found (channel never entered `seeded`); consumers treat absence as
+    "start empty".
+    """
+    writes_by_ch_by_cid: dict[str, dict[str, list[tuple[str, bytes, str, int]]]] = {
+        ch: {} for ch in channels
+    }
+    for cid, ch, task_id, idx, type_tag, value_blob in stage2_rows:
+        writes_by_ch_by_cid.setdefault(ch, {}).setdefault(cid, []).append(
+            (type_tag, value_blob, task_id, idx)
+        )
+    for cid_map in writes_by_ch_by_cid.values():
+        for ws in cid_map.values():
+            ws.sort(key=lambda w: (w[2], w[3]))
+
+    result: dict[str, DeltaChannelHistory] = {}
+    for ch in channels:
+        chain_cids = chain_by_ch.get(ch, [])
+        cid_writes = writes_by_ch_by_cid.get(ch, {})
+        collected: list[PendingWrite] = []
+        # Chain is newest-first; iterate oldest-first for the public order.
+        for cid in reversed(chain_cids):
+            for type_tag, value_blob, task_id, _idx in cid_writes.get(cid, []):
+                collected.append(
+                    (task_id, ch, serde.loads_typed((type_tag, value_blob)))
+                )
+        entry: DeltaChannelHistory = {"writes": collected}
+        if ch in seeded:
+            entry["seed"] = seed_val_by_ch[ch]
+        result[ch] = entry
+    return result

libs/checkpoint-sqlite/langgraph/checkpoint/sqlite/aio.py

@@ -4,7 +4,7 @@ import asyncio
 import json
 import random
 import threading
-from collections.abc import AsyncIterator, Callable, Iterator, Sequence
+from collections.abc import AsyncIterator, Callable, Iterator, Mapping, Sequence
 from contextlib import asynccontextmanager
 from typing import Any, TypeVar, cast
 
@@ -17,12 +17,19 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
     SerializerProtocol,
     get_checkpoint_id,
     get_checkpoint_metadata,
 )
 from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
 
+from langgraph.checkpoint.sqlite._delta import (
+    DELTA_STAGE1_SQL,
+    build_delta_channels_writes_history,
+    build_delta_stage2_sql,
+    step_walk_with_row,
+)
 from langgraph.checkpoint.sqlite.utils import search_where
 
 T = TypeVar("T", bound=Callable)
@@ -205,7 +212,7 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
         while True:
             try:
                 yield asyncio.run_coroutine_threadsafe(
-                    anext(aiter_),  # type: ignore[arg-type]  # noqa: F821
+                    anext(aiter_),  # type: ignore[arg-type]
                     self.loop,
                 ).result()
             except StopAsyncIteration:
@@ -272,6 +279,29 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
             self.adelete_thread(thread_id), self.loop
         ).result()
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Sync bridge to `aget_delta_channel_history`.
+
+        Mirrors the same cross-thread guard as `get_tuple` /
+        `delete_thread` — calling from the loop thread raises rather than
+        deadlocking.
+        """
+        try:
+            if asyncio.get_running_loop() is self.loop:
+                raise asyncio.InvalidStateError(
+                    "Synchronous calls to AsyncSqliteSaver are only allowed from a "
+                    "different thread. From the main thread, use the async interface. "
+                    "For example, use `await checkpointer.aget_delta_channel_history(...)`."
+                )
+        except RuntimeError:
+            pass
+        return asyncio.run_coroutine_threadsafe(
+            self.aget_delta_channel_history(config=config, channels=channels),
+            self.loop,
+        ).result()
+
     async def setup(self) -> None:
         """Set up the checkpoint database asynchronously.
 
@@ -589,6 +619,83 @@ class AsyncSqliteSaver(BaseCheckpointSaver[str]):
             )
             await self.conn.commit()
 
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Fast-path override of `BaseCheckpointSaver.aget_delta_channel_history`.
+
+        See `SqliteSaver.get_delta_channel_history` for design notes; this
+        is the async equivalent using `aiosqlite` cursors. Stage 1 pages
+        the parent chain newest-first and Python-deserializes each
+        checkpoint blob to find per-channel snapshots; stage 2 fetches
+        only the relevant writes via per-channel UNION ALL.
+        """
+        if not channels:
+            return {}
+        channels = list(channels)
+        await self.setup()
+        thread_id = str(config["configurable"]["thread_id"])
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = get_checkpoint_id(config)
+        if checkpoint_id is None:
+            target = await self.aget_tuple(config)
+            if target is None:
+                return {ch: {"writes": []} for ch in channels}
+            checkpoint_id = target.config["configurable"]["checkpoint_id"]
+
+        chain_by_ch: dict[str, list[str]] = {ch: [] for ch in channels}
+        seed_val_by_ch: dict[str, Any] = {}
+        walk_state: dict[str, Any] = {}
+        seeded: set[str] = set()
+
+        async with self.lock, self.conn.cursor() as cur:
+            await cur.execute(
+                DELTA_STAGE1_SQL, (thread_id, checkpoint_ns, checkpoint_id)
+            )
+            async for row in cur:
+                cid, parent_cid, type_tag, blob = row
+                if step_walk_with_row(
+                    cid=cid,
+                    parent_cid=parent_cid,
+                    type_tag=type_tag,
+                    blob=blob,
+                    target_id=checkpoint_id,
+                    serde=self.serde,
+                    chain_by_ch=chain_by_ch,
+                    seed_val_by_ch=seed_val_by_ch,
+                    walk_state=walk_state,
+                    seeded=seeded,
+                    channels=channels,
+                ):
+                    break
+
+            channels_with_chain = [ch for ch in channels if chain_by_ch[ch]]
+            stage2_sql = build_delta_stage2_sql(
+                chain_lens=[len(chain_by_ch[ch]) for ch in channels_with_chain],
+            )
+            if stage2_sql:
+                stage2_params: list[Any] = []
+                for ch in channels_with_chain:
+                    stage2_params.extend(
+                        [thread_id, checkpoint_ns, ch, *chain_by_ch[ch]]
+                    )
+                await cur.execute(stage2_sql, stage2_params)
+                stage2_rows = cast(
+                    "list[tuple[str, str, str, int, str, bytes]]",
+                    await cur.fetchall(),
+                )
+            else:
+                stage2_rows = []
+
+        return build_delta_channels_writes_history(
+            channels=channels,
+            chain_by_ch=chain_by_ch,
+            seed_val_by_ch=seed_val_by_ch,
+            seeded=seeded,
+            stage2_rows=stage2_rows,
+            serde=self.serde,
+        )
+
     def get_next_version(self, current: str | None, channel: None) -> str:
         """Generate the next version ID for a channel.
 

libs/checkpoint-sqlite/langgraph/store/sqlite/aio.py

@@ -24,11 +24,13 @@ from langgraph.store.base.batch import AsyncBatchedBaseStore
 
 from langgraph.store.sqlite.base import (
     _PLACEHOLDER,
+    NS_MATCH_FUNCTION,
     BaseSqliteStore,
     SqliteIndexConfig,
     _decode_ns_text,
     _ensure_index_config,
     _group_ops,
+    _namespace_match,
     _row_to_item,
     _row_to_search_item,
 )
@@ -150,6 +152,13 @@ class AsyncSqliteStore(AsyncBatchedBaseStore, BaseSqliteStore):
             if self.is_setup:
                 return
 
+            # list_namespaces needs segment-aware matching, which SQLite cannot
+            # express in LIKE or GLOB. Registered here rather than in __init__
+            # because aiosqlite's create_function is a coroutine.
+            await self.conn.create_function(
+                NS_MATCH_FUNCTION, 2, _namespace_match, deterministic=True
+            )
+
             # Create migrations table if it doesn't exist
             await self.conn.execute(
                 """

libs/checkpoint-sqlite/langgraph/store/sqlite/base.py

@@ -93,12 +93,74 @@ class SqliteIndexConfig(IndexConfig):
     pass
 
 
-def _namespace_to_text(
-    namespace: tuple[str, ...], handle_wildcards: bool = False
-) -> str:
+NS_MATCH_FUNCTION = "_langgraph_namespace_match"
+"""SQLite user function backing segment-aware namespace matching.
+
+Registered under a private name rather than overriding `REGEXP`, so a caller's
+own `REGEXP` is left untouched.
+"""
+
+
+def _namespace_match(prefix: str | None, pattern: str) -> int:
+    """Backing implementation of `NS_MATCH_FUNCTION`."""
+    if prefix is None:
+        return 0
+    return 1 if re.search(pattern, prefix) else 0
+
+
+def _escape_glob_literal(text: str) -> str:
+    """Escape GLOB metacharacters so `text` is matched literally.
+
+    GLOB has no `ESCAPE` clause, so metacharacters are wrapped in a character
+    class instead. `]` is literal outside a class and needs no escaping.
+    """
+    return text.replace("[", "[[]").replace("*", "[*]").replace("?", "[?]")
+
+
+def _namespace_prefix_condition(
+    namespace_prefix: tuple[str, ...], column: str = "prefix"
+) -> tuple[str, tuple[str, ...]]:
+    """Build the SQL scoping a search to a namespace and its descendants.
+
+    Matches the namespace exactly or requires the `.` separator before any
+    remainder, so a prefix of `("foo",)` does not also match `("foobar",)`.
+
+    Uses GLOB rather than LIKE because SQLite's LIKE is case-insensitive for
+    ASCII, which would match `("FOO",)` for a prefix of `("foo",)` even though
+    `get`/`put`/`delete` compare with `=` and treat those as distinct.
+
+    An empty prefix is unconstrained and matches every namespace.
+    """
+    if not namespace_prefix:
+        return "TRUE", ()
+    path = _namespace_to_text(namespace_prefix)
+    condition = f"({column} = ? OR {column} GLOB ?)"
+    return condition, (path, f"{_escape_glob_literal(path)}.*")
+
+
+def _namespace_match_pattern(path: tuple[str, ...], match_type: str) -> str:
+    """Build a regex matching the dot-joined prefix on whole namespace segments.
+
+    Needed because neither LIKE nor GLOB can express "any character except the
+    separator": GLOB has character classes but no quantifier, so `[^.]*` still
+    crosses `.`. Matches how `InMemoryStore` compares namespaces element-wise.
+
+    `*` matches exactly one segment. Prefix matches stay open-ended but must end
+    on a separator; suffix matches anchor at the end and begin on one.
+
+    Examples:
+        prefix ("uid", "*", "alice") -> ^uid\\.[^.]+\\.alice(\\.|\\Z)
+        suffix ("alice",)            -> (^|\\.)alice\\Z
+    """
+    segments = ("[^.]+" if part == "*" else re.escape(part) for part in path)
+    body = r"\.".join(segments)
+    if match_type == "suffix":
+        return rf"(^|\.){body}\Z"
+    return rf"^{body}(\.|\Z)"
+
+
+def _namespace_to_text(namespace: tuple[str, ...]) -> str:
     """Convert namespace tuple to text string."""
-    if handle_wildcards:
-        namespace = tuple("%" if val == "*" else val for val in namespace)
     return ".".join(namespace)
 
 
@@ -461,8 +523,11 @@ class BaseSqliteStore:
                     else " AND " + " AND ".join(filter_conditions)
                 )
                 if op.namespace_prefix:
-                    prefix_filter_str = f"WHERE s.prefix LIKE ? {filter_str} "
-                    ns_args: Sequence = (f"{_namespace_to_text(op.namespace_prefix)}%",)
+                    ns_condition, ns_args_tuple = _namespace_prefix_condition(
+                        op.namespace_prefix, column="s.prefix"
+                    )
+                    prefix_filter_str = f"WHERE {ns_condition} {filter_str} "
+                    ns_args: Sequence = ns_args_tuple
                 else:
                     ns_args = ()
                     if filter_str:
@@ -503,12 +568,15 @@ class BaseSqliteStore:
                 ]
             # Regular search branch (no vector search)
             else:
-                base_query = """
+                ns_condition, ns_args_tuple = _namespace_prefix_condition(
+                    op.namespace_prefix
+                )
+                base_query = f"""
                     SELECT prefix, key, value, created_at, updated_at, expires_at, ttl_minutes, NULL as score
                     FROM store
-                    WHERE prefix LIKE ?
+                    WHERE {ns_condition}
                 """
-                params = [f"{_namespace_to_text(op.namespace_prefix)}%"]
+                params = list(ns_args_tuple)
 
                 if filter_conditions:
                     params.extend(filter_params)
@@ -549,16 +617,28 @@ class BaseSqliteStore:
 
             if op.match_conditions:
                 for cond in op.match_conditions:
-                    if cond.match_type == "prefix":
-                        where_clauses.append("prefix LIKE ?")
-                        params.append(
-                            f"{_namespace_to_text(cond.path, handle_wildcards=True)}%"
-                        )
-                    elif cond.match_type == "suffix":
-                        where_clauses.append("prefix LIKE ?")
-                        params.append(
-                            f"%{_namespace_to_text(cond.path, handle_wildcards=True)}"
-                        )
+                    if cond.match_type in ("prefix", "suffix"):
+                        if not cond.path:
+                            # An empty path constrains nothing; skipping keeps it a
+                            # no-op rather than emitting a pattern that matches no
+                            # namespace at all.
+                            continue
+                        if cond.match_type == "prefix" and "*" not in cond.path:
+                            # Equivalent to the anchored pattern, but SQLite can
+                            # satisfy `=` and a trailing-wildcard GLOB from
+                            # store_prefix_idx. The user function is opaque to the
+                            # planner, so it would scan every row and call back
+                            # into Python for each one.
+                            condition, args = _namespace_prefix_condition(
+                                tuple(cond.path)
+                            )
+                            where_clauses.append(condition)
+                            params.extend(args)
+                        else:
+                            where_clauses.append(f"{NS_MATCH_FUNCTION}(prefix, ?) = 1")
+                            params.append(
+                                _namespace_match_pattern(cond.path, cond.match_type)
+                            )
                     else:
                         logger.warning(
                             "Unknown match_type in list_namespaces: %s", cond.match_type
@@ -785,6 +865,9 @@ class SqliteStore(BaseSqliteStore, BaseStore):
         super().__init__()
         self._deserializer = deserializer
         self.conn = conn
+        # Registered here rather than in from_conn_string so a caller-supplied
+        # connection also gets it.
+        conn.create_function(NS_MATCH_FUNCTION, 2, _namespace_match, deterministic=True)
         self.lock = threading.Lock()
         self.is_setup = False
         self.index_config = index

libs/checkpoint-sqlite/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint-sqlite"
-version = "3.0.3"
+version = "3.1.1"
 description = "Library with a SQLite implementation of LangGraph checkpoint saver."
 authors = []
 requires-python = ">=3.10"
@@ -12,14 +12,14 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=3,<5.0.0",
+    "langgraph-checkpoint>=4.1.0,<5.0.0",
     "aiosqlite>=0.20",
     "sqlite-vec>=0.1.6",
 ]
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint-sqlite"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 
@@ -30,12 +30,13 @@ test = [
   "pytest-mock",
   "pytest-watcher",
   "langgraph-checkpoint",
+  "langgraph-checkpoint-conformance",
   "pytest-retry>=1.7.0",
 ]
 lint = [
   "ruff",
   "codespell",
-  "mypy",
+  "ty",
 ]
 dev = [
   {include-group = "test"},
@@ -47,6 +48,7 @@ default-groups = ['dev']
 
 [tool.uv.sources]
 langgraph-checkpoint = { path = "../checkpoint", editable = true }
+langgraph-checkpoint-conformance = { path = "../checkpoint-conformance", editable = true }
 
 [tool.hatch.build.targets.wheel]
 include = ["langgraph"]
@@ -62,23 +64,29 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
+  "PLC0415",  # import-outside-top-level
+  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
 target-version = "py310"
 
+[tool.ty.rules]
+invalid-argument-type = "ignore"
+invalid-assignment = "ignore"
+invalid-key = "ignore"
+invalid-method-override = "ignore"
+invalid-return-type = "ignore"
+invalid-yield = "ignore"
+not-iterable = "ignore"
+not-subscriptable = "ignore"
+unused-type-ignore-comment = "ignore"
+unresolved-attribute = "ignore"
+unresolved-import = "ignore"
+unsupported-operator = "ignore"
+
 [tool.pytest-watcher]
 now = true
 delay = 0.1
 runner_args = ["--ff", "-v", "--tb", "short"]
 patterns = ["*.py"]
-
-[tool.mypy]
-# https://mypy.readthedocs.io/en/stable/config_file.html
-disallow_untyped_defs = "True"
-explicit_package_bases = "True"
-warn_no_return = "False"
-warn_unused_ignores = "True"
-warn_redundant_casts = "True"
-allow_redefinition = "True"
-disable_error_code = "typeddict-item, return-value"

libs/checkpoint-sqlite/tests/test_async_store.py

@@ -1,4 +1,3 @@
-# mypy: disable-error-code="union-attr,arg-type,index,operator"
 import asyncio
 import os
 import tempfile
@@ -717,3 +716,32 @@ async def test_search_items(
         for ns in test_namespaces:
             key = f"item_{ns[-1]}"
             await store.adelete(ns, key)
+
+
+async def test_async_namespace_segment_boundary(store: AsyncSqliteStore) -> None:
+    """Segment-aware scoping on the async path.
+
+    Also covers that the namespace-match SQLite function is registered on the
+    async connection -- aiosqlite's create_function is a coroutine, so it is
+    registered in setup() rather than __init__.
+    """
+    for namespace in [
+        ("foo",),
+        ("foo", "child"),
+        ("foobar",),
+        ("uid", "users", "alice"),
+        ("uid", "users", "malice"),
+        ("user_1",),
+        ("userX1",),
+    ]:
+        await store.aput(namespace, "k", {"v": 1})
+
+    found = {item.namespace for item in await store.asearch(("foo",), limit=100)}
+    assert found == {("foo",), ("foo", "child")}
+
+    found = {item.namespace for item in await store.asearch(("user_1",), limit=100)}
+    assert found == {("user_1",)}
+
+    assert set(await store.alist_namespaces(suffix=["alice"], limit=100)) == {
+        ("uid", "users", "alice"),
+    }

libs/checkpoint-sqlite/tests/test_conformance_delta.py

@@ -0,0 +1,28 @@
+"""Run delta-channel conformance capabilities against AsyncSqliteSaver."""
+
+from __future__ import annotations
+
+import pytest
+from langgraph.checkpoint.conformance import validate
+from langgraph.checkpoint.conformance.initializer import checkpointer_test
+
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+
+
+@pytest.mark.asyncio
+async def test_delta_channel_conformance():
+    @checkpointer_test(name="AsyncSqliteSaver")
+    async def sqlite_saver():
+        async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+            yield saver
+
+    report = await validate(
+        sqlite_saver,
+        capabilities={
+            "delta_channel_history",
+        },
+    )
+    for cap, result in report.results.items():
+        if result.passed is False:
+            details = "\n".join(result.failures or [])
+            pytest.fail(f"Capability {cap} failed:\n{details}")

libs/checkpoint-sqlite/tests/test_delta_channel_migration.py

@@ -0,0 +1,170 @@
+"""Sqlite-specific migration smoke tests: BinaryOperatorAggregate -> DeltaChannel.
+
+Mirrors `libs/langgraph/tests/test_delta_channel_migration.py` (which
+covers `InMemorySaver` + a third-party fallback to the base default
+impl). This file exercises the same migration scenario through the
+sqlite-specific `SqliteSaver.get_delta_channel_history` override —
+specifically that the streaming ancestor walk finds a pre-migration
+plain `channel_values[ch]` entry and surfaces it as the `seed`, with
+post-migration writes folding on top through the reducer.
+
+Pre-migration checkpoints under `BinaryOperatorAggregate` carry the
+full accumulated value at every settled super-step boundary. The
+override has to identify those as "real" seeds (not `_DeltaSnapshot`
+sentinels) — the saver layer is intentionally delta-agnostic and just
+returns whatever is stored in `channel_values[ch]`.
+"""
+
+from __future__ import annotations
+
+import operator
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+
+# `langgraph` core isn't a dep of `langgraph-checkpoint-sqlite`. Skip the
+# whole module rather than importerror-ing in the standalone CI shape.
+pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
+pytest.importorskip("langgraph.channels.binop", reason="langgraph core not installed")
+pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
+
+from langgraph.channels.binop import BinaryOperatorAggregate  # type: ignore[import-untyped]  # noqa: I001
+from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]
+from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]
+from typing_extensions import TypedDict
+
+from langgraph.checkpoint.sqlite import SqliteSaver
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+
+pytestmark = pytest.mark.anyio
+
+
+def _noop(_state: Any) -> dict:
+    return {}
+
+
+def _list_concat(state: list, writes: list) -> list:
+    result = list(state)
+    for w in writes:
+        result.extend(w if isinstance(w, list) else [w])
+    return result
+
+
+def _binop_graph(checkpointer: Any) -> Any:
+    class BinopState(TypedDict):
+        items: Annotated[list, BinaryOperatorAggregate(list, operator.add)]
+
+    return (
+        StateGraph(BinopState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _delta_graph(checkpointer: Any) -> Any:
+    class DeltaState(TypedDict):
+        items: Annotated[list, DeltaChannel(_list_concat)]
+
+    return (
+        StateGraph(DeltaState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _drive(graph: Any, config: RunnableConfig, tag: str, n: int) -> None:
+    for i in range(n):
+        graph.invoke({"items": [f"{tag}{i}"]}, config)
+
+
+async def _adrive(graph: Any, config: RunnableConfig, tag: str, n: int) -> None:
+    for i in range(n):
+        await graph.ainvoke({"items": [f"{tag}{i}"]}, config)
+
+
+def _settled_boundaries(history: list) -> list[tuple[RunnableConfig, list]]:
+    """`(config, items)` for every checkpoint with `next == ('__start__',)`
+    — the stable inter-invoke boundaries that round-trip predictably.
+    """
+    return [
+        (s.config, list(s.values.get("items", [])))
+        for s in history
+        if s.next == ("__start__",)
+    ]
+
+
+def test_migration_preserves_pre_migration_state_sync() -> None:
+    """Drive 3 invokes under `BinaryOperatorAggregate`, swap the
+    annotation to `DeltaChannel` on the same sqlite-backed thread, and
+    verify every settled pre-migration boundary round-trips exactly.
+
+    The override's streaming walk must identify the plain accumulated
+    list at each pre-migration ancestor as a valid `seed` even though
+    no `_DeltaSnapshot` was ever written there.
+    """
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "mig-sync"}}
+
+        binop = _binop_graph(saver)
+        _drive(binop, config, "u", 3)
+
+        pre_boundaries = _settled_boundaries(list(binop.get_state_history(config)))
+        assert len(pre_boundaries) >= 2, "expected multiple settled boundaries"
+
+        delta = _delta_graph(saver)
+        for cfg, items in pre_boundaries:
+            snap = delta.get_state(cfg)
+            assert list(snap.values.get("items", [])) == items, (
+                f"snapshot mismatch at {cfg['configurable']['checkpoint_id']}: "
+                f"expected {items}, got {snap.values.get('items', [])}"
+            )
+
+
+def test_migration_continued_thread_folds_deltas_on_seed_sync() -> None:
+    """After migration, driving one more super-step extends the
+    pre-migration accumulated state via the delta reducer — the seed
+    plus a single new write.
+    """
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "mig-continue-sync"}}
+
+        binop = _binop_graph(saver)
+        _drive(binop, config, "u", 3)
+
+        pre_history = list(binop.get_state_history(config))
+        pre_boundaries = _settled_boundaries(pre_history)
+        # Latest settled boundary — the leaf pre-migration state.
+        leaf_cfg, leaf_items = pre_boundaries[0]
+        assert leaf_items, "expected non-empty pre-migration leaf"
+
+        delta = _delta_graph(saver)
+        delta.invoke({"items": ["after-migration"]}, leaf_cfg)
+        new_state = delta.get_state(config).values["items"]
+        assert new_state[: len(leaf_items)] == leaf_items
+        assert "after-migration" in new_state
+
+
+async def test_migration_preserves_pre_migration_state_async() -> None:
+    """Async equivalent of the basic-migration round-trip check on
+    `AsyncSqliteSaver`."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "mig-async"}}
+
+        binop = _binop_graph(saver)
+        await _adrive(binop, config, "u", 3)
+
+        pre_history = [s async for s in binop.aget_state_history(config)]
+        pre_boundaries = _settled_boundaries(pre_history)
+        assert len(pre_boundaries) >= 2
+
+        delta = _delta_graph(saver)
+        for cfg, items in pre_boundaries:
+            snap = await delta.aget_state(cfg)
+            assert list(snap.values.get("items", [])) == items, (
+                f"async snapshot mismatch at {cfg['configurable']['checkpoint_id']}"
+            )

libs/checkpoint-sqlite/tests/test_get_delta_channel_history.py

@@ -0,0 +1,271 @@
+"""Smoke tests for `BaseCheckpointSaver.get_delta_channel_history` on sqlite.
+
+`SqliteSaver` (and `AsyncSqliteSaver`) deliberately don't override the
+default implementation in `BaseCheckpointSaver` — these tests pin the
+default impl to behave correctly end-to-end against a real persistent
+saver and a real `DeltaChannel`-backed graph.
+
+Scenarios covered:
+
+* Empty `channels` argument returns an empty mapping (no I/O).
+* On a non-trivial multi-checkpoint thread, per-channel writes come back
+  oldest→newest.
+* When the walk reaches the root without ever finding a stored value,
+  `seed` is omitted from the entry (consumer treats absence as "start
+  empty").
+* When a `_DeltaSnapshot` blob is present at an ancestor, it is returned
+  as the `seed`.
+* The async saver returns the same shape via `aget_delta_channel_history`.
+"""
+
+from __future__ import annotations
+
+import operator
+from typing import Annotated, Any
+
+import pytest
+from langchain_core.runnables import RunnableConfig
+
+# `langgraph` is not a dep of `langgraph-checkpoint-sqlite`. When tests run
+# in the sqlite lib's standalone CI environment without it installed, skip
+# the whole module rather than failing at import.
+pytest.importorskip("langgraph.channels.delta", reason="langgraph core not installed")
+pytest.importorskip("langgraph.graph", reason="langgraph core not installed")
+
+from langgraph.channels.delta import DeltaChannel  # type: ignore[import-untyped]  # noqa: I001
+from langgraph.checkpoint.serde.types import _DeltaSnapshot
+from langgraph.graph import END, START, StateGraph  # type: ignore[import-untyped]
+from typing_extensions import TypedDict
+
+from langgraph.checkpoint.sqlite import SqliteSaver
+from langgraph.checkpoint.sqlite.aio import AsyncSqliteSaver
+
+pytestmark = pytest.mark.anyio
+
+
+# ---------------------------------------------------------------------------
+# Graph helpers
+# ---------------------------------------------------------------------------
+
+
+def _noop(_state: Any) -> dict[str, Any]:
+    return {}
+
+
+class _DeltaState(TypedDict):
+    items: Annotated[list, DeltaChannel(operator.add)]
+
+
+def _delta_graph(checkpointer: Any) -> Any:
+    return (
+        StateGraph(_DeltaState)
+        .add_node("noop", _noop)
+        .add_edge(START, "noop")
+        .add_edge("noop", END)
+        .compile(checkpointer=checkpointer)
+    )
+
+
+def _drive(graph: Any, config: RunnableConfig, n: int) -> None:
+    for i in range(n):
+        graph.invoke({"items": [f"v{i}"]}, config)
+
+
+async def _adrive(graph: Any, config: RunnableConfig, n: int) -> None:
+    for i in range(n):
+        await graph.ainvoke({"items": [f"v{i}"]}, config)
+
+
+def _pick_non_root(saver: Any, config: RunnableConfig) -> RunnableConfig:
+    """Return a config pointing at a checkpoint that has at least one ancestor.
+
+    `get_delta_channel_history` walks the parent chain — calling it on the root
+    checkpoint produces `writes=[]` and no `seed`, which is uninteresting
+    for the multi-step assertions below.
+    """
+    history = list(saver.list(config))
+    assert history, "expected non-empty history"
+    # `list` yields newest→oldest; the second entry has the first entry
+    # as its parent, so its parent_config is non-None.
+    for tup in history:
+        if tup.parent_config is not None:
+            return tup.config
+    raise AssertionError("no checkpoint with a parent in history")
+
+
+async def _apick_non_root(saver: Any, config: RunnableConfig) -> RunnableConfig:
+    history = [tup async for tup in saver.alist(config)]
+    assert history, "expected non-empty history"
+    for tup in history:
+        if tup.parent_config is not None:
+            return tup.config
+    raise AssertionError("no checkpoint with a parent in history")
+
+
+# ---------------------------------------------------------------------------
+# Sync: SqliteSaver
+# ---------------------------------------------------------------------------
+
+
+def test_empty_channels_returns_empty_mapping_sync() -> None:
+    """Empty `channels` short-circuits to `{}` without touching storage."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "empty"}}
+        assert saver.get_delta_channel_history(config=config, channels=[]) == {}
+
+
+def test_writes_history_oldest_to_newest_sync() -> None:
+    """Per-channel writes accumulated across the walk come back oldest→newest."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "history-sync"}}
+        graph = _delta_graph(saver)
+        _drive(graph, config, 3)
+
+        target_cfg = _pick_non_root(saver, config)
+        result = saver.get_delta_channel_history(config=target_cfg, channels=["items"])
+
+        assert "items" in result
+        entry = result["items"]
+        assert isinstance(entry["writes"], list)
+
+        # If any writes were collected, their values should be in oldest→newest
+        # order — i.e. tagged 'v0', 'v1', ... matching invoke order.
+        write_values: list[Any] = []
+        for _task_id, channel, value in entry["writes"]:
+            assert channel == "items"
+            write_values.extend(value if isinstance(value, list) else [value])
+
+        # `_drive` invokes with payloads ['v0'], ['v1'], ['v2']. Whatever
+        # subset shows up in the chain must be a contiguous prefix in order.
+        for idx, val in enumerate(write_values):
+            assert val == f"v{idx}", (
+                f"writes not in oldest→newest order: {write_values}"
+            )
+
+
+def test_seed_present_when_snapshot_in_ancestor_sync() -> None:
+    """Inserting a `_DeltaSnapshot` blob at an ancestor → walk returns it as `seed`."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "seed-sync"}}
+        graph = _delta_graph(saver)
+        _drive(graph, config, 2)
+
+        # Find the oldest non-root checkpoint, then walk to its parent and
+        # rewrite that parent's `channel_values["items"]` to a real
+        # `_DeltaSnapshot`. After this surgery, calling `get_delta_channel_history`
+        # at the leaf must return the snapshot value as `seed`.
+        history = list(saver.list(config))
+        assert len(history) >= 2
+        leaf_tup = history[0]
+        # Walk to an ancestor with a parent_config (any non-root will do).
+        ancestor_tup = next(
+            (tup for tup in history if tup.parent_config is not None), None
+        )
+        assert ancestor_tup is not None
+        parent_cfg = ancestor_tup.parent_config
+        assert parent_cfg is not None
+        parent_tup = saver.get_tuple(parent_cfg)
+        assert parent_tup is not None
+
+        snapshot_value = ["seeded", "items"]
+        parent_tup.checkpoint["channel_values"]["items"] = _DeltaSnapshot(
+            snapshot_value
+        )
+        # Make sure the channel has a version so the optimized blob lookup
+        # in any future override has something to hit.
+        parent_tup.checkpoint["channel_versions"].setdefault("items", 1)
+        saver.put(
+            parent_tup.parent_config or {"configurable": parent_cfg["configurable"]},
+            parent_tup.checkpoint,
+            parent_tup.metadata,
+            {},
+        )
+
+        result = saver.get_delta_channel_history(
+            config=leaf_tup.config, channels=["items"]
+        )
+        entry = result["items"]
+        assert "seed" in entry, f"expected seed to be present, got {entry}"
+        seed = entry["seed"]
+        assert isinstance(seed, _DeltaSnapshot), (
+            f"expected _DeltaSnapshot, got {seed!r}"
+        )
+        assert seed.value == snapshot_value
+
+
+def test_seed_omitted_when_walk_reaches_root_sync() -> None:
+    """`get_delta_channel_history` on the root checkpoint → no `seed` key, no writes."""
+    with SqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "root-sync"}}
+        graph = _delta_graph(saver)
+        _drive(graph, config, 1)
+
+        history = list(saver.list(config))
+        # Root is the oldest checkpoint (no parent_config).
+        root_tup = history[-1]
+        assert root_tup.parent_config is None
+
+        result = saver.get_delta_channel_history(
+            config=root_tup.config, channels=["items"]
+        )
+        entry = result["items"]
+        assert "seed" not in entry, f"root-walk should have no seed, got {entry}"
+        assert entry["writes"] == []
+
+
+# ---------------------------------------------------------------------------
+# Async: AsyncSqliteSaver
+# ---------------------------------------------------------------------------
+
+
+async def test_empty_channels_returns_empty_mapping_async() -> None:
+    """Async equivalent of the empty-channels short-circuit."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "empty-async"}}
+        assert await saver.aget_delta_channel_history(config=config, channels=[]) == {}
+
+
+async def test_writes_history_oldest_to_newest_async() -> None:
+    """Async equivalent of the oldest→newest ordering check."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "history-async"}}
+        graph = _delta_graph(saver)
+        await _adrive(graph, config, 3)
+
+        target_cfg = await _apick_non_root(saver, config)
+        result = await saver.aget_delta_channel_history(
+            config=target_cfg, channels=["items"]
+        )
+
+        assert "items" in result
+        entry = result["items"]
+        assert isinstance(entry["writes"], list)
+
+        write_values: list[Any] = []
+        for _task_id, channel, value in entry["writes"]:
+            assert channel == "items"
+            write_values.extend(value if isinstance(value, list) else [value])
+
+        for idx, val in enumerate(write_values):
+            assert val == f"v{idx}", (
+                f"writes not in oldest→newest order: {write_values}"
+            )
+
+
+async def test_seed_omitted_when_walk_reaches_root_async() -> None:
+    """Async equivalent of the root-walk seed-absence check."""
+    async with AsyncSqliteSaver.from_conn_string(":memory:") as saver:
+        config: RunnableConfig = {"configurable": {"thread_id": "root-async"}}
+        graph = _delta_graph(saver)
+        await _adrive(graph, config, 1)
+
+        history = [tup async for tup in saver.alist(config)]
+        root_tup = history[-1]
+        assert root_tup.parent_config is None
+
+        result = await saver.aget_delta_channel_history(
+            config=root_tup.config, channels=["items"]
+        )
+        entry = result["items"]
+        assert "seed" not in entry, f"root-walk should have no seed, got {entry}"
+        assert entry["writes"] == []

libs/checkpoint-sqlite/tests/test_store.py

@@ -1,8 +1,11 @@
-# mypy: disable-error-code="union-attr,arg-type,index,operator"
+import math
 import os
+import random
 import re
 import tempfile
+import time
 import uuid
+from collections import Counter, defaultdict
 from collections.abc import Generator, Iterable
 from contextlib import contextmanager
 from typing import Any, Literal, cast
@@ -19,7 +22,13 @@ from langgraph.store.base import (
 )
 
 from langgraph.store.sqlite import SqliteStore
-from langgraph.store.sqlite.base import SqliteIndexConfig
+from langgraph.store.sqlite.base import (
+    NS_MATCH_FUNCTION,
+    BaseSqliteStore,
+    SqliteIndexConfig,
+    _escape_glob_literal,
+    _namespace_match_pattern,
+)
 
 
 # Local embeddings implementation for testing vector search
@@ -28,10 +37,6 @@ class CharacterEmbeddings(Embeddings):
 
     def __init__(self, dims: int = 50, seed: int = 42):
         """Initialize with embedding dimensions and random seed."""
-        import math
-        import random
-        from collections import defaultdict
-
         self._rng = random.Random(seed)
         self.dims = dims
         # Create projection vector for each character lazily
@@ -43,9 +48,6 @@ class CharacterEmbeddings(Embeddings):
 
     def _embed_one(self, text: str) -> list[float]:
         """Embed a single text."""
-        import math
-        from collections import Counter
-
         counts = Counter(text)
         total = sum(counts.values())
 
@@ -333,8 +335,6 @@ class TestSqliteStore:
 
             # Test update
             # Small delay to ensure the updated timestamp is different
-            import time
-
             time.sleep(0.01)
 
             updated_value = {"title": "Updated Document", "content": "Hello, Updated!"}
@@ -1230,3 +1230,208 @@ def test_non_ascii(
         assert result3[0].key == "3"
         assert result4[0].key == "4"
         assert result5[0].key == "5"
+
+
+def test_escape_glob_literal() -> None:
+    assert _escape_glob_literal("users.alice") == "users.alice"
+    # "_" and "%" are LIKE wildcards but literal in GLOB, so they are left alone.
+    assert _escape_glob_literal("user_1") == "user_1"
+    assert _escape_glob_literal("100%") == "100%"
+    assert _escape_glob_literal("a*b") == "a[*]b"
+    assert _escape_glob_literal("a?b") == "a[?]b"
+    assert _escape_glob_literal("a[b") == "a[[]b"
+
+
+def test_namespace_match_pattern() -> None:
+    assert _namespace_match_pattern(("foo",), "prefix") == r"^foo(\.|\Z)"
+    assert (
+        _namespace_match_pattern(("uid", "*", "alice"), "prefix")
+        == r"^uid\.[^.]+\.alice(\.|\Z)"
+    )
+    assert _namespace_match_pattern(("alice",), "suffix") == r"(^|\.)alice\Z"
+
+
+def test_search_namespace_segment_boundary(store: SqliteStore) -> None:
+    """Prefix scoping must stop at namespace segment boundaries.
+
+    Namespaces are stored dot-joined, so matching the raw text also returns
+    siblings sharing leading characters.
+    """
+    for namespace in [
+        ("foo",),
+        ("foo", "child"),
+        ("foo", "child", "deep"),
+        ("foobar",),
+        ("foobar", "baz"),
+        ("foo2",),
+    ]:
+        store.put(namespace, "k", {"v": 1})
+
+    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
+        return {item.namespace for item in store.search(prefix, limit=100)}
+
+    assert _namespaces(("foo",)) == {
+        ("foo",),
+        ("foo", "child"),
+        ("foo", "child", "deep"),
+    }
+    # The sibling scope is independent, not merely narrower.
+    assert _namespaces(("foobar",)) == {("foobar",), ("foobar", "baz")}
+    assert _namespaces(("foo2",)) == {("foo2",)}
+    assert _namespaces(("fo",)) == set()
+
+
+def test_search_namespace_wildcard_chars_are_literal(store: SqliteStore) -> None:
+    """LIKE and GLOB metacharacters in labels must be matched literally."""
+    for namespace in [
+        ("user_1",),
+        ("user_1", "child"),
+        ("userX1",),
+        ("a%b",),
+        ("axxb",),
+        ("star*",),
+        ("starX",),
+    ]:
+        store.put(namespace, "k", {"v": 1})
+
+    def _namespaces(prefix: tuple[str, ...]) -> set[tuple[str, ...]]:
+        return {item.namespace for item in store.search(prefix, limit=100)}
+
+    # Also asserts each namespace still matches itself, which catches escaping
+    # the equality arm by mistake.
+    assert _namespaces(("user_1",)) == {("user_1",), ("user_1", "child")}
+    assert _namespaces(("a%b",)) == {("a%b",)}
+    assert _namespaces(("star*",)) == {("star*",)}
+
+
+def test_search_namespace_is_case_sensitive(store: SqliteStore) -> None:
+    """Search must agree with get/put, which compare namespaces with `=`.
+
+    SQLite's LIKE is case-insensitive for ASCII, so matching with it conflated
+    namespaces that every other operation treats as distinct.
+    """
+    store.put(("Foo",), "k", {"v": "upper"})
+    store.put(("foo",), "k", {"v": "lower"})
+
+    assert {item.namespace for item in store.search(("foo",), limit=100)} == {("foo",)}
+    assert {item.namespace for item in store.search(("Foo",), limit=100)} == {("Foo",)}
+
+
+def test_list_namespaces_segment_boundary(store: SqliteStore) -> None:
+    for namespace in [
+        ("foo",),
+        ("foo", "child"),
+        ("foobar",),
+        ("foobar", "baz"),
+        ("uid", "users", "alice"),
+        ("uid", "users", "malice"),
+        ("uid", "a", "b", "alice"),
+    ]:
+        store.put(namespace, "k", {"v": 1})
+
+    assert set(store.list_namespaces(prefix=["foo"], limit=100)) == {
+        ("foo",),
+        ("foo", "child"),
+    }
+    # Suffix must align to a segment: "malice" does not end with the "alice"
+    # segment.
+    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
+        ("uid", "users", "alice"),
+        ("uid", "a", "b", "alice"),
+    }
+    # "*" spans exactly one segment.
+    assert set(store.list_namespaces(prefix=["uid", "*", "alice"], limit=100)) == {
+        ("uid", "users", "alice"),
+    }
+    # Prefix matching stays open-ended across depth.
+    assert set(store.list_namespaces(prefix=["uid"], limit=100)) == {
+        ("uid", "users", "alice"),
+        ("uid", "users", "malice"),
+        ("uid", "a", "b", "alice"),
+    }
+
+
+def test_search_empty_prefix_is_unconstrained(store: SqliteStore) -> None:
+    """An empty prefix constrains nothing and must return every namespace."""
+    for namespace in [("a",), ("b", "c"), ("d", "e", "f")]:
+        store.put(namespace, "k", {"v": 1})
+
+    assert {item.namespace for item in store.search((), limit=100)} == {
+        ("a",),
+        ("b", "c"),
+        ("d", "e", "f"),
+    }
+
+
+def test_namespace_labels_with_trailing_newline(store: SqliteStore) -> None:
+    """Labels may contain newlines, and must not match a differently-named label.
+
+    Python's `$` also matches just before a trailing newline, so the patterns use
+    `\\Z` to anchor at the true end of the string.
+    """
+    store.put(("users", "alice"), "k", {"v": 1})
+    store.put(("users", "alice\n"), "k", {"v": 2})
+
+    assert set(store.list_namespaces(suffix=["alice"], limit=100)) == {
+        ("users", "alice"),
+    }
+    assert set(store.list_namespaces(prefix=["users", "alice"], limit=100)) == {
+        ("users", "alice"),
+    }
+
+
+def test_list_namespaces_prefix_uses_indexable_condition() -> None:
+    """Plain prefixes must use the indexable condition, not the match function.
+
+    A user function is opaque to the query planner, so it scans every row and
+    calls back into Python for each one. Only suffix and wildcard paths, which
+    no SQLite operator can express, need it.
+    """
+    store = BaseSqliteStore()
+
+    def where(match_type: str, path: tuple[str, ...]) -> str:
+        op = ListNamespacesOp(
+            match_conditions=(MatchCondition(match_type=match_type, path=path),),
+            max_depth=None,
+            limit=10,
+            offset=0,
+        )
+        query, _ = store._get_batch_list_namespaces_queries([(0, op)])[0]
+        return " ".join(query.split())
+
+    assert "GLOB" in where("prefix", ("uid", "users"))
+    assert NS_MATCH_FUNCTION not in where("prefix", ("uid", "users"))
+    # A label that merely contains "*" is not the wildcard.
+    assert "GLOB" in where("prefix", ("star*",))
+    # Wildcard and suffix cannot be expressed by GLOB, so they keep the function.
+    assert NS_MATCH_FUNCTION in where("prefix", ("uid", "*", "alice"))
+    assert NS_MATCH_FUNCTION in where("suffix", ("alice",))
+
+
+def test_list_namespaces_metacharacter_labels(store: SqliteStore) -> None:
+    """Metacharacters in labels are literal on both matching paths.
+
+    Plain prefixes take the `= OR GLOB` condition and wildcard/suffix paths take
+    the regex function, so escaping has to hold in two different syntaxes.
+    """
+    pairs = [
+        ("star*", "starX"),
+        ("q?m", "qXm"),
+        ("br[ack]et", "brXacXket"),
+        ("user_1", "userX1"),
+        ("a%b", "axxb"),
+        ("plus+", "plusX"),
+    ]
+    for label, decoy in pairs:
+        store.put((label,), "k", {"v": 1})
+        store.put((decoy,), "k", {"v": 1})
+        store.put((label, "child"), "k", {"v": 1})
+
+    for label, decoy in pairs:
+        found = set(store.list_namespaces(prefix=[label], limit=100))
+        assert found == {(label,), (label, "child")}
+        # The decoy differs only where the metacharacter would have matched.
+        assert (decoy,) not in found
+        assert set(store.list_namespaces(prefix=[label, "child"], limit=100)) == {
+            (label, "child"),
+        }

libs/checkpoint-sqlite/uv.lock

@@ -1,6 +1,10 @@
 version = 1
 revision = 3
 requires-python = ">=3.10"
+resolution-markers = [
+    "python_full_version >= '3.15'",
+    "python_full_version < '3.15'",
+]
 
 [[package]]
 name = "aiosqlite"
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 [[package]]
 name = "codespell"
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+version = "2.4.3"
 source = { registry = "https://pypi.org/simple" }
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 [[package]]
@@ -164,7 +168,7 @@ name = "exceptiongroup"
 version = "1.3.1"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.13'" },
+    { name = "typing-extensions" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
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@@ -210,11 +214,11 @@ wheels = [
 
 [[package]]
 name = "idna"
-version = "3.11"
+version = "3.15"
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+    { url = "https://files.pythonhosted.org/packages/d2/23/408243171aa9aaba178d3e2559159c24c1171a641aa83b67bdd3394ead8e/idna-3.15-py3-none-any.whl", hash = "sha256:048adeaf8c2d788c40fee287673ccaa74c24ffd8dcf09ffa555a2fbb59f10ac8", size = 72340, upload-time = "2026-05-12T22:45:55.733Z" },
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 [[package]]
@@ -249,10 +253,11 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "1.2.11"
+version = "1.5.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
@@ -261,14 +266,26 @@ dependencies = [
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+]
+
+[[package]]
+name = "langchain-protocol"
+version = "0.0.18"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions" },
+]
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+wheels = [
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 ]
 
 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.2.0"
 source = { editable = "../checkpoint" }
 dependencies = [
     { name = "langchain-core" },
@@ -285,7 +302,6 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
     { name = "numpy" },
     { name = "pandas" },
     { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
@@ -296,11 +312,12 @@ dev = [
     { name = "pytest-watcher" },
     { name = "redis" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 lint = [
     { name = "codespell" },
-    { name = "mypy" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 test = [
     { name = "dataclasses-json" },
@@ -314,9 +331,36 @@ test = [
     { name = "redis" },
 ]
 
+[[package]]
+name = "langgraph-checkpoint-conformance"
+version = "0.0.2"
+source = { editable = "../checkpoint-conformance" }
+dependencies = [
+    { name = "langgraph-checkpoint" },
+]
+
+[package.metadata]
+requires-dist = [{ name = "langgraph-checkpoint", editable = "../checkpoint" }]
+
+[package.metadata.requires-dev]
+dev = [
+    { name = "pytest" },
+    { name = "pytest-asyncio" },
+    { name = "ruff" },
+    { name = "ty" },
+]
+lint = [
+    { name = "ruff" },
+    { name = "ty" },
+]
+test = [
+    { name = "pytest" },
+    { name = "pytest-asyncio" },
+]
+
 [[package]]
 name = "langgraph-checkpoint-sqlite"
-version = "3.0.3"
+version = "3.1.1"
 source = { editable = "." }
 dependencies = [
     { name = "aiosqlite" },
@@ -328,21 +372,23 @@ dependencies = [
 dev = [
     { name = "codespell" },
     { name = "langgraph-checkpoint" },
-    { name = "mypy" },
+    { name = "langgraph-checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-retry" },
     { name = "pytest-watcher" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 lint = [
     { name = "codespell" },
-    { name = "mypy" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 test = [
     { name = "langgraph-checkpoint" },
+    { name = "langgraph-checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -361,21 +407,23 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
+    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-retry", specifier = ">=1.7.0" },
     { name = "pytest-watcher" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 lint = [
     { name = "codespell" },
-    { name = "mypy" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 test = [
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
+    { name = "langgraph-checkpoint-conformance", editable = "../checkpoint-conformance" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
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+version = "0.8.18"
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@@ -395,220 +443,94 @@ dependencies = [
     { name = "requests" },
     { name = "requests-toolbelt" },
     { name = "uuid-utils" },
+    { name = "websockets" },
+    { name = "xxhash" },
     { name = "zstandard" },
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 name = "zstandard"
 version = "0.25.0"

libs/checkpoint/Makefile

@@ -18,22 +18,19 @@ test_watch:
 
 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
-MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph
 lint_tests: PYTHON_FILES=tests
-lint_tests: MYPY_CACHE=.mypy_cache_test
 
 lint lint_diff lint_package lint_tests:
 	uv run ruff check .
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff format $(PYTHON_FILES) --diff
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE)
-	[ "$(PYTHON_FILES)" = "" ] || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run ty check $(PYTHON_FILES)
 
 type:
-	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	uv run ty check $(PYTHON_FILES)
 
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)

libs/checkpoint/README.md

@@ -1,6 +1,26 @@
 # LangGraph Checkpoint
 
-This library defines the base interface for LangGraph checkpointers. Checkpointers provide a persistence layer for LangGraph. They allow you to interact with and manage the graph's state. When you use a graph with a checkpointer, the checkpointer saves a _checkpoint_ of the graph state at every superstep, enabling several powerful capabilities like human-in-the-loop, "memory" between interactions and more.
+[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-checkpoint?label=%20)](https://pypi.org/project/langgraph-checkpoint/#history)
+[![PyPI - License](https://img.shields.io/pypi/l/langgraph-checkpoint)](https://opensource.org/licenses/MIT)
+[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-checkpoint)](https://pypistats.org/packages/langgraph-checkpoint)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
+
+To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
+[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
+
+## Quick Install
+
+```bash
+uv add langgraph-checkpoint
+```
+
+## 🤔 What is this?
+
+This library defines the base interface for LangGraph checkpointers. Checkpointers provide a persistence layer for LangGraph: they save graph state at every superstep, enabling human-in-the-loop, memory between interactions, durable execution, and more.
+
+## 📖 Documentation
+
+For full documentation, see the [API reference](https://reference.langchain.com/python/langgraph.checkpoint). For conceptual guides on persistence and memory, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
 
 ## Key concepts
 
@@ -24,7 +44,10 @@ You must pass these when invoking the graph as part of the configurable part of
 
 ### Serde
 
-`langgraph_checkpoint` also defines protocol for serialization/deserialization (serde) and provides an default implementation (`langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer`) that handles a wide variety of types, including LangChain and LangGraph primitives, datetimes, enums and more.
+`langgraph-checkpoint` also defines protocol for serialization/deserialization (serde) and provides a default implementation (`langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer`) that handles a wide variety of types, including LangChain and LangGraph primitives, datetimes, enums and more.
+
+> [!IMPORTANT]
+> **Checkpoint deserialization security:** By default the serializer allows any Python type found in checkpoint data. New applications should set the environment variable `LANGGRAPH_STRICT_MSGPACK=true` or pass an explicit `allowed_msgpack_modules` list to `JsonPlusSerializer` to restrict deserialization to known-safe types.
 
 ### Pending writes
 
@@ -86,3 +109,13 @@ checkpointer.get(read_config)
 # list checkpoints
 list(checkpointer.list(read_config))
 ```
+
+## 📕 Releases & Versioning
+
+See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
+
+## 💁 Contributing
+
+As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
+
+For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).

libs/checkpoint/langgraph/checkpoint/base/__init__.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 import copy
 import logging
 from collections.abc import AsyncIterator, Collection, Iterator, Mapping, Sequence
-from typing import (  # noqa: UP035
+from typing import (
     Any,
     Generic,
     Literal,
@@ -13,6 +13,7 @@ from typing import (  # noqa: UP035
 )
 
 from langchain_core.runnables import RunnableConfig
+from typing_extensions import NotRequired
 
 from langgraph.checkpoint.base.id import uuid6
 from langgraph.checkpoint.serde.base import SerializerProtocol, maybe_add_typed_methods
@@ -28,6 +29,8 @@ from langgraph.checkpoint.serde.types import (
 
 V = TypeVar("V", int, float, str)
 PendingWrite = tuple[str, str, Any]
+
+
 logger = logging.getLogger(__name__)
 
 
@@ -57,6 +60,30 @@ class CheckpointMetadata(TypedDict, total=False):
     """
     run_id: str
     """The ID of the run that created this checkpoint."""
+    counters_since_delta_snapshot: dict[str, tuple[int, int]]
+    """Per-channel counters since the last `_DeltaSnapshot` was written.
+
+    !!! warning "Beta"
+
+        This metadata field backs `DeltaChannel` (beta). The key name and
+        contents may change while the delta-channel design stabilizes.
+
+    Maps channel name -> `(updates, supersteps)`:
+
+    - index 0 (`updates`): number of supersteps that wrote to this channel
+      since its last snapshot blob.
+    - index 1 (`supersteps`): total supersteps elapsed since this channel's
+      last snapshot, regardless of whether the channel was written.
+
+    A snapshot fires when EITHER `updates >= ch.snapshot_frequency` OR
+    `supersteps >= DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT` (system-wide bound,
+    default 5000, env `LANGGRAPH_DELTA_MAX_SUPERSTEPS_SINCE_SNAPSHOT`).
+    The supersteps bound prevents unbounded ancestor walks on threads where
+    a delta channel exists but is no longer being updated.
+
+    Absent on threads that don't use delta channels. Persisted as a
+    2-element list in JSON (no native tuple).
+    """
 
 
 ChannelVersions = dict[str, str | int | float]
@@ -119,6 +146,33 @@ class CheckpointTuple(NamedTuple):
     pending_writes: list[PendingWrite] | None = None
 
 
+class DeltaChannelHistory(TypedDict):
+    """Per-channel result entry from `BaseCheckpointSaver.get_delta_channel_history`.
+
+    !!! warning "Beta"
+
+        Part of the `DeltaChannel` support surface; in beta. Field names and
+        semantics may change.
+
+    Storage-level view of what one channel contributed across the ancestor
+    chain of a target checkpoint:
+
+    * `writes` — on-path deltas oldest→newest as `PendingWrite` tuples.
+      Always present; possibly empty. Already filtered to one channel.
+      Writes stored at the target checkpoint itself are pending for the
+      next super-step and are excluded.
+    * `seed` — the stored value at the nearest ancestor whose
+      `channel_values[ch]` is populated. Omitted if the walk reached the
+      root without finding any stored value (consumer treats absence as
+      "start empty"). Typically a `_DeltaSnapshot` for delta channels with
+      finite snapshot frequency, or a plain value for threads migrated
+      from a pre-delta channel type.
+    """
+
+    writes: list[PendingWrite]
+    seed: NotRequired[Any]
+
+
 class BaseCheckpointSaver(Generic[V]):
     """Base class for creating a graph checkpointer.
 
@@ -282,6 +336,14 @@ class BaseCheckpointSaver(Generic[V]):
 
         Args:
             run_ids: The run IDs whose checkpoints should be deleted.
+
+        !!! warning "DeltaChannel"
+
+            Deleting a run that produced ancestor `checkpoint_writes` — or
+            the only `_DeltaSnapshot` blob — for a still-live thread will
+            break reconstruction of any `DeltaChannel` whose history
+            depended on those rows. See the `DeltaChannel` note on `prune`
+            for safe-recovery strategies.
         """
         raise NotImplementedError
 
@@ -295,6 +357,17 @@ class BaseCheckpointSaver(Generic[V]):
         Args:
             source_thread_id: The thread ID to copy from.
             target_thread_id: The thread ID to copy to.
+
+        !!! warning "DeltaChannel"
+
+            Implementations must copy the **complete** parent chain (all
+            ancestor checkpoints and their `checkpoint_writes`) — copying
+            only the head checkpoint will leave the target thread with
+            `DeltaChannel` state that cannot be reconstructed (no path back
+            to a `_DeltaSnapshot` ancestor). Equivalently, the copy must
+            include enough ancestors that every `DeltaChannel`-backed key
+            has either a `_DeltaSnapshot` in `channel_values` somewhere in
+            the chain, or a complete write history back to the chain root.
         """
         raise NotImplementedError
 
@@ -310,6 +383,34 @@ class BaseCheckpointSaver(Generic[V]):
             thread_ids: The thread IDs to prune.
             strategy: The pruning strategy. `"keep_latest"` retains only the most
                 recent checkpoint per namespace. `"delete"` removes all checkpoints.
+
+        !!! warning "DeltaChannel"
+
+            Custom implementations must be `DeltaChannel`-aware. `DeltaChannel`
+            stores only a sentinel in `channel_values` for non-snapshot steps;
+            reconstruction walks the parent chain via
+            `get_delta_channel_history`, accumulating rows from
+            `checkpoint_writes` until it reaches an ancestor whose
+            `channel_values` contains a `_DeltaSnapshot` blob (written every
+            `snapshot_frequency` updates).
+
+            A naive `"keep_latest"` that drops intermediate checkpoints and
+            their writes can sever that chain: the surviving "latest"
+            checkpoint is rarely a snapshot point itself, so its delta
+            channels would silently reconstruct as empty (no error raised —
+            `get_delta_channel_history` simply returns no `seed`). Safe
+            options when the graph uses `DeltaChannel`:
+
+            * Walk back from each kept checkpoint and preserve every
+              ancestor (plus its `checkpoint_writes`) up to the nearest one
+              whose `channel_values` already contains a `_DeltaSnapshot` for
+              every `DeltaChannel`-backed key.
+            * Force a fresh snapshot on the kept checkpoint before deleting
+              ancestors — rewrite `channel_values[k] = _DeltaSnapshot(value)`
+              for each delta channel `k` (resolving `value` via the existing
+              ancestor walk first), then prune.
+            * Skip pruning threads whose graph uses `DeltaChannel` until one
+              of the above is implemented.
         """
         raise NotImplementedError
 
@@ -426,6 +527,13 @@ class BaseCheckpointSaver(Generic[V]):
 
         Args:
             run_ids: The run IDs whose checkpoints should be deleted.
+
+        !!! warning "DeltaChannel"
+
+            See `delete_for_runs` — deleting rows a still-live thread's
+            `DeltaChannel` reconstruction depends on (writes between the
+            head and its nearest `_DeltaSnapshot` ancestor) will silently
+            corrupt that channel's state.
         """
         raise NotImplementedError
 
@@ -439,6 +547,13 @@ class BaseCheckpointSaver(Generic[V]):
         Args:
             source_thread_id: The thread ID to copy from.
             target_thread_id: The thread ID to copy to.
+
+        !!! warning "DeltaChannel"
+
+            See `copy_thread` — the copy must carry the complete parent
+            chain (or at least back to a `_DeltaSnapshot` ancestor for every
+            `DeltaChannel`) so the target thread can reconstruct delta
+            state.
         """
         raise NotImplementedError
 
@@ -454,9 +569,126 @@ class BaseCheckpointSaver(Generic[V]):
             thread_ids: The thread IDs to prune.
             strategy: The pruning strategy. `"keep_latest"` retains only the most
                 recent checkpoint per namespace. `"delete"` removes all checkpoints.
+
+        !!! warning "DeltaChannel"
+
+            See `prune` for the full `DeltaChannel` caveat. In short:
+            `"keep_latest"` must not drop ancestor checkpoints / writes that
+            sit between the kept checkpoint and the nearest `_DeltaSnapshot`
+            ancestor, or delta channels will silently reconstruct as empty.
         """
         raise NotImplementedError
 
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Walk the parent chain returning per-channel writes + seed.
+
+        !!! warning "Beta"
+
+            This method is part of the `DeltaChannel` support surface and is
+            in beta. The signature, return shape (`DeltaChannelHistory`), and
+            interaction with `_DeltaSnapshot` blobs may change. Override at
+            your own risk; the default implementation will continue to work
+            against the public `BaseCheckpointSaver` contract.
+
+        For each requested channel, walks ancestors of the checkpoint
+        identified by `config` (following `parent_config`) and accumulates
+        `pending_writes` for that channel. The walk terminates per-channel
+        at the nearest ancestor whose `channel_values[ch]` is populated;
+        that value is returned as `seed`. If the walk reaches the root
+        without finding a stored value, `seed` is omitted from that
+        channel's entry — the consumer treats the absence as "start
+        empty."
+
+        Walks the **parent chain** (not `list(before=...)`): for forked
+        threads, only on-path ancestors contribute.
+
+        The default implementation walks `get_tuple` + `parent_config`
+        once for all channels — each ancestor visited once, not once per
+        channel. Savers with direct storage access (`InMemorySaver`,
+        `PostgresSaver`) override for performance; the return contract is
+        fixed here.
+
+        Args:
+            config: Configuration identifying the target checkpoint.
+            channels: Channel names to walk for. Empty → empty mapping.
+
+        Returns:
+            Per-channel `DeltaChannelHistory` for every name in `channels`.
+        """
+        if not channels:
+            return {}
+        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
+        seed_by_ch: dict[str, Any] = {}
+        remaining: set[str] = set(channels)
+        target_tuple = self.get_tuple(config)
+        cursor_config: RunnableConfig | None = (
+            target_tuple.parent_config if target_tuple else None
+        )
+        while cursor_config is not None and remaining:
+            tup = self.get_tuple(cursor_config)
+            if tup is None:
+                break
+            if tup.pending_writes:
+                for write in reversed(tup.pending_writes):
+                    ch = write[1]
+                    if ch in remaining:
+                        collected_by_ch[ch].append(write)
+            for ch in list(remaining):
+                if ch in tup.checkpoint["channel_values"]:
+                    seed_by_ch[ch] = tup.checkpoint["channel_values"][ch]
+                    remaining.discard(ch)
+            cursor_config = tup.parent_config
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            entry: DeltaChannelHistory = {"writes": list(reversed(collected_by_ch[ch]))}
+            if ch in seed_by_ch:
+                entry["seed"] = seed_by_ch[ch]
+            result[ch] = entry
+        return result
+
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Async version of `get_delta_channel_history`.
+
+        !!! warning "Beta"
+
+            This method is part of the `DeltaChannel` support surface and is
+            in beta. See `get_delta_channel_history` for caveats.
+        """
+        if not channels:
+            return {}
+        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
+        seed_by_ch: dict[str, Any] = {}
+        remaining: set[str] = set(channels)
+        target_tuple = await self.aget_tuple(config)
+        cursor_config: RunnableConfig | None = (
+            target_tuple.parent_config if target_tuple else None
+        )
+        while cursor_config is not None and remaining:
+            tup = await self.aget_tuple(cursor_config)
+            if tup is None:
+                break
+            if tup.pending_writes:
+                for write in reversed(tup.pending_writes):
+                    ch = write[1]
+                    if ch in remaining:
+                        collected_by_ch[ch].append(write)
+            for ch in list(remaining):
+                if ch in tup.checkpoint["channel_values"]:
+                    seed_by_ch[ch] = tup.checkpoint["channel_values"][ch]
+                    remaining.discard(ch)
+            cursor_config = tup.parent_config
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            entry: DeltaChannelHistory = {"writes": list(reversed(collected_by_ch[ch]))}
+            if ch in seed_by_ch:
+                entry["seed"] = seed_by_ch[ch]
+            result[ch] = entry
+        return result
+
     def get_next_version(self, current: V | None, channel: None) -> V:
         """Generate the next version ID for a channel.
 

libs/checkpoint/langgraph/checkpoint/memory/__init__.py

@@ -6,7 +6,7 @@ import pickle
 import random
 import shutil
 from collections import defaultdict
-from collections.abc import AsyncIterator, Iterator, Sequence
+from collections.abc import AsyncIterator, Iterator, Mapping, Sequence
 from contextlib import AbstractAsyncContextManager, AbstractContextManager, ExitStack
 from types import TracebackType
 from typing import Any
@@ -20,6 +20,8 @@ from langgraph.checkpoint.base import (
     Checkpoint,
     CheckpointMetadata,
     CheckpointTuple,
+    DeltaChannelHistory,
+    PendingWrite,
     SerializerProtocol,
     get_checkpoint_id,
     get_checkpoint_metadata,
@@ -121,16 +123,109 @@ class InMemorySaver(
         return self.stack.__exit__(__exc_type, __exc_value, __traceback)
 
     def _load_blobs(
-        self, thread_id: str, checkpoint_ns: str, versions: ChannelVersions
+        self,
+        thread_id: str,
+        checkpoint_ns: str,
+        versions: ChannelVersions,
     ) -> dict[str, Any]:
-        channel_values: dict[str, Any] = {}
-        for k, v in versions.items():
-            kk = (thread_id, checkpoint_ns, k, v)
-            if kk in self.blobs:
-                vv = self.blobs[kk]
-                if vv[0] != "empty":
-                    channel_values[k] = self.serde.loads_typed(vv)
-        return channel_values
+        result: dict[str, Any] = {}
+        for k, ver in versions.items():
+            kk = (thread_id, checkpoint_ns, k, ver)
+            if kk not in self.blobs:
+                continue
+            vv = self.blobs[kk]
+            if vv[0] == "empty":
+                continue
+            result[k] = self.serde.loads_typed(vv)
+        return result
+
+    def get_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        """Override: walk the parent chain ONCE for all requested channels.
+
+        Each channel terminates independently at the nearest ancestor
+        whose stored blob is non-empty. Other channels keep walking until
+        they find their own terminator or hit the root.
+
+        A blob is the value AT its ancestor, prior to the writes stored
+        under that same ancestor (those writes produce its child, which
+        is on the path to the target). This holds for `_DeltaSnapshot`
+        blobs and for pre-delta plain values alike, so the seed
+        ancestor's own writes are always collected. Writes at ancestors
+        older than the seed are subsumed by the seed value and are never
+        reached — the walk terminates there.
+        """
+        if not channels:
+            return {}
+        thread_id = config["configurable"]["thread_id"]
+        checkpoint_ns = config["configurable"].get("checkpoint_ns", "")
+        checkpoint_id = config["configurable"].get("checkpoint_id", "")
+        ns_storage = self.storage.get(thread_id, {}).get(checkpoint_ns, {})
+
+        chain: list[str] = []
+        target_entry = ns_storage.get(checkpoint_id)
+        current: str | None = target_entry[2] if target_entry is not None else None
+        while current is not None:
+            entry = ns_storage.get(current)
+            if entry is None:
+                break
+            chain.append(current)
+            _, _, parent = entry
+            current = parent
+
+        collected_by_ch: dict[str, list[PendingWrite]] = {c: [] for c in channels}
+        seed_by_ch: dict[str, Any] = {}
+        remaining: set[str] = set(channels)
+
+        for cp_id in chain:
+            if not remaining:
+                break
+            entry = ns_storage.get(cp_id)
+            ckpt = self.serde.loads_typed(entry[0]) if entry is not None else None
+
+            terminated_here: set[str] = set()
+            blob_value_by_ch: dict[str, Any] = {}
+            if ckpt is not None:
+                versions = ckpt.get("channel_versions", {})
+                for ch in remaining:
+                    ver = versions.get(ch)
+                    if ver is None:
+                        continue
+                    blob_entry = self.blobs.get((thread_id, checkpoint_ns, ch, ver))
+                    if blob_entry is None or blob_entry[0] == "empty":
+                        continue
+                    blob_value_by_ch[ch] = self.serde.loads_typed(blob_entry)
+                    terminated_here.add(ch)
+
+            step_writes = self.writes.get((thread_id, checkpoint_ns, cp_id), {})
+            for (_task_id, _idx), (tid, ch, serialized, _) in sorted(
+                step_writes.items(), reverse=True
+            ):
+                if ch not in remaining:
+                    continue
+                collected_by_ch[ch].append(
+                    (tid, ch, self.serde.loads_typed(serialized))
+                )
+
+            for ch in terminated_here:
+                seed_by_ch[ch] = blob_value_by_ch[ch]
+                remaining.discard(ch)
+
+        result: dict[str, DeltaChannelHistory] = {}
+        for ch in channels:
+            entry_h: DeltaChannelHistory = {
+                "writes": list(reversed(collected_by_ch[ch]))
+            }
+            if ch in seed_by_ch:
+                entry_h["seed"] = seed_by_ch[ch]
+            result[ch] = entry_h
+        return result
+
+    async def aget_delta_channel_history(
+        self, *, config: RunnableConfig, channels: Sequence[str]
+    ) -> Mapping[str, DeltaChannelHistory]:
+        return self.get_delta_channel_history(config=config, channels=channels)
 
     def get_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the in-memory storage.

libs/checkpoint/langgraph/checkpoint/serde/_msgpack.py

@@ -1,3 +1,10 @@
+"""Msgpack deserialization safety controls.
+
+Set ``LANGGRAPH_STRICT_MSGPACK=true`` to restrict checkpoint deserialization
+to the types listed in ``SAFE_MSGPACK_TYPES``.  Without this, any Python
+callable stored in checkpoint data will be imported and executed on load.
+"""
+
 import os
 from collections.abc import Iterable
 from typing import cast
@@ -66,6 +73,7 @@ SAFE_MSGPACK_TYPES: frozenset[tuple[str, ...]] = frozenset(
         ("langchain_core.documents.base", "Document"),
         # langgraph
         ("langgraph.types", "Send"),
+        ("langgraph.types", "TimeoutPolicy"),
         ("langgraph.types", "Interrupt"),
         ("langgraph.types", "Command"),
         ("langgraph.types", "StateSnapshot"),

libs/checkpoint/langgraph/checkpoint/serde/jsonplus.py

@@ -33,19 +33,51 @@ from langchain_core.load.load import Reviver
 from langgraph.checkpoint.serde import _msgpack as _lg_msgpack
 from langgraph.checkpoint.serde.base import SerializerProtocol
 from langgraph.checkpoint.serde.event_hooks import emit_serde_event
-from langgraph.checkpoint.serde.types import SendProtocol
+from langgraph.checkpoint.serde.types import (
+    SendProtocol,
+    _DeltaSnapshot,
+)
 from langgraph.store.base import Item
 
 if TYPE_CHECKING:
     from langgraph.checkpoint.serde._msgpack import (
         AllowedMsgpackModules,
     )
-    from langgraph.checkpoint.serde.types import SendProtocol
 
-LC_REVIVER = Reviver()
+LC_REVIVER = Reviver(allowed_objects="core")
 EMPTY_BYTES = b""
 logger = logging.getLogger(__name__)
 
+# Dedup log warnings across process lifetime; cap bounds state if types are
+# dynamically generated (also acts as a circuit breaker on warning volume).
+# Dedup is best-effort: racing threads may each emit once for the same key,
+# and warnings are silently dropped once _MAX_WARNED_TYPES is reached.
+_MAX_WARNED_TYPES = 1000
+_warned_unregistered_types: set[tuple[str, str]] = set()
+_warned_blocked_types: set[tuple[str, str]] = set()
+
+
+def _is_safe_json_type(id_list: list[str]) -> bool:
+    """Return True if an lc=2 id refers to a type in SAFE_MSGPACK_TYPES.
+
+    Safe types bypass the ``allowed_json_modules`` gate so that old "json" format
+    checkpoints (written before the msgpack migration) can be resumed without
+    requiring users to configure an explicit allowlist.
+    """
+    if len(id_list) < 2:
+        return False
+    module_name = ".".join(id_list[:-1])
+    return (module_name, id_list[-1]) in _lg_msgpack.SAFE_MSGPACK_TYPES
+
+
+def _warn_once(
+    seen: set[tuple[str, str]], key: tuple[str, str], msg: str, *args: object
+) -> None:
+    if key in seen or len(seen) >= _MAX_WARNED_TYPES:
+        return
+    seen.add(key)
+    logger.warning(msg, *args)
+
 
 class JsonPlusSerializer(SerializerProtocol):
     """Serializer that uses ormsgpack, with optional fallbacks.
@@ -56,6 +88,10 @@ class JsonPlusSerializer(SerializerProtocol):
         class and called within the Pregel loop. It should not be used on untrusted
         python objects. If an attacker can write directly to your checkpoint database,
         they may be able to trigger code execution when data is deserialized.
+
+        Set the environment variable ``LANGGRAPH_STRICT_MSGPACK=true`` to restrict
+        deserialization to a built-in allowlist of safe types.  You can also pass
+        an explicit ``allowed_msgpack_modules`` to the constructor.
     """
 
     def __init__(
@@ -70,8 +106,11 @@ class JsonPlusSerializer(SerializerProtocol):
     ) -> None:
         if allowed_msgpack_modules is _lg_msgpack._SENTINEL:
             if _lg_msgpack.STRICT_MSGPACK_ENABLED:
+                # Strict: only SAFE_MSGPACK_TYPES are allowed.
                 allowed_msgpack_modules = None
             else:
+                # Permissive (default): all types allowed with a warning.
+                # Set LANGGRAPH_STRICT_MSGPACK=true to lock this down.
                 allowed_msgpack_modules = True
         self.pickle_fallback = pickle_fallback
         self._allowed_json_modules: set[tuple[str, ...]] | Literal[True] | None = (
@@ -118,41 +157,24 @@ class JsonPlusSerializer(SerializerProtocol):
             )
         return clone
 
-    def _encode_constructor_args(
-        self,
-        constructor: Callable | type[Any],
-        *,
-        method: None | str | Sequence[None | str] = None,
-        args: Sequence[Any] | None = None,
-        kwargs: dict[str, Any] | None = None,
-    ) -> dict[str, Any]:
-        out = {
-            "lc": 2,
-            "type": "constructor",
-            "id": (*constructor.__module__.split("."), constructor.__name__),
-        }
-        if method is not None:
-            out["method"] = method
-        if args is not None:
-            out["args"] = args
-        if kwargs is not None:
-            out["kwargs"] = kwargs
-        return out
-
     def _reviver(self, value: dict[str, Any]) -> Any:
-        if self._allowed_json_modules and (
+        if (
             value.get("lc", None) == 2
             and value.get("type", None) == "constructor"
             and value.get("id", None) is not None
         ):
-            try:
-                return self._revive_lc2(value)
-            except InvalidModuleError as e:
-                logger.warning(
-                    "Object %s is not in the deserialization allowlist.\n%s",
-                    value["id"],
-                    e.message,
-                )
+            id_list = value["id"]
+            is_safe = _is_safe_json_type(id_list)
+            if self._allowed_json_modules or is_safe:
+                try:
+                    return self._revive_lc2(value)
+                except InvalidModuleError as e:
+                    if not is_safe:
+                        logger.warning(
+                            "Object %s is not in the deserialization allowlist.\n%s",
+                            value["id"],
+                            e.message,
+                        )
 
         return LC_REVIVER(value)
 
@@ -160,49 +182,57 @@ class JsonPlusSerializer(SerializerProtocol):
         self._check_allowed_json_modules(value)
 
         [*module, name] = value["id"]
+        # The `method` field on lc:2 envelopes is intentionally ignored.
+        # Revival is restricted to the default constructor (no `getattr`
+        # dispatch on attacker-influenced names). The framework's own
+        # encoder has not emitted `method=` since the msgpack migration,
+        # and the only legacy emission was `method=(None, "construct")`
+        # for pydantic models, where the first entry (`None`) already
+        # meant "default constructor", which is what we do here.
         try:
             mod = importlib.import_module(".".join(module))
             cls = getattr(mod, name)
-            method = value.get("method")
-            if isinstance(method, str):
-                methods = [getattr(cls, method)]
-            elif isinstance(method, list):
-                methods = [cls if m is None else getattr(cls, m) for m in method]
-            else:
-                methods = [cls]
+            if isclass(cls) and issubclass(cls, BaseException):
+                return None
             args = value.get("args")
             kwargs = value.get("kwargs")
-            for method in methods:
-                try:
-                    if isclass(method) and issubclass(method, BaseException):
-                        return None
-                    if args and kwargs:
-                        return method(*args, **kwargs)
-                    elif args:
-                        return method(*args)
-                    elif kwargs:
-                        return method(**kwargs)
-                    else:
-                        return method()
-                except Exception:
-                    continue
-        except Exception:
+            if args and kwargs:
+                return cls(*args, **kwargs)
+            elif args:
+                return cls(*args)
+            elif kwargs:
+                return cls(**kwargs)
+            else:
+                return cls()
+        except Exception as exc:
+            # Method-field dispatch has been removed (GHSA-fjqc-hq36-qh5p), so
+            # legacy pydantic payloads emitting `method=[None, "construct"]`
+            # no longer fall back to `cls.construct(**kwargs)` when the
+            # default constructor rejects the serialized kwargs. Surface a
+            # one-line warning so operators can spot payloads that now revive
+            # to `None` instead of silently degrading to the raw envelope.
+            logger.warning(
+                "Failed to revive lc:2 envelope %s "
+                "(legacy_method_field=%s, error=%s); returning None",
+                ".".join((*module, name)),
+                "method" in value,
+                type(exc).__name__,
+            )
             return None
 
     def _check_allowed_json_modules(self, value: dict[str, Any]) -> None:
         needed = tuple(value["id"])
-        method = value.get("method")
-        if isinstance(method, list):
-            method_display = ",".join(m or "<init>" for m in method)
-        elif isinstance(method, str):
-            method_display = method
-        else:
-            method_display = "<init>"
-
         dotted = ".".join(needed)
+        # Safe types (the same set already allowed for msgpack deserialization) are
+        # permitted without an explicit allowlist — they are known-safe LangGraph and
+        # LangChain types.  This restores backwards-compat for old "json" checkpoints
+        # that pre-date the msgpack migration without reopening the broader security gate.
+        if _is_safe_json_type(list(needed)):
+            return
+
         if not self._allowed_json_modules:
             raise InvalidModuleError(
-                f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
+                f"Refused to deserialize JSON constructor: {dotted}. "
                 "No allowed_json_modules configured.\n\n"
                 "Unblock with ONE of:\n"
                 f"  • JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -217,7 +247,7 @@ class JsonPlusSerializer(SerializerProtocol):
             return
 
         raise InvalidModuleError(
-            f"Refused to deserialize JSON constructor: {dotted} (method: {method_display}). "
+            f"Refused to deserialize JSON constructor: {dotted}. "
             "Symbol is not in the deserialization allowlist.\n\n"
             "Add exactly this symbol to unblock:\n"
             f"  JsonPlusSerializer(allowed_json_modules=[{needed!r}, ...])\n"
@@ -269,10 +299,13 @@ EXT_METHOD_SINGLE_ARG = 3
 EXT_PYDANTIC_V1 = 4
 EXT_PYDANTIC_V2 = 5
 EXT_NUMPY_ARRAY = 6
+EXT_DELTA_SNAPSHOT = 7
 
 
 def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
-    if hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
+    if isinstance(obj, _DeltaSnapshot):
+        return ormsgpack.Ext(EXT_DELTA_SNAPSHOT, _msgpack_enc(obj.value))
+    elif hasattr(obj, "model_dump") and callable(obj.model_dump):  # pydantic v2
         return ormsgpack.Ext(
             EXT_PYDANTIC_V2,
             _msgpack_enc(
@@ -444,10 +477,13 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
             ),
         )
     elif isinstance(obj, SendProtocol):
+        args: tuple[Any, ...] = (obj.node, obj.arg)
+        if (timeout := getattr(obj, "timeout", None)) is not None:
+            args = (obj.node, obj.arg, timeout)
         return ormsgpack.Ext(
             EXT_CONSTRUCTOR_POS_ARGS,
             _msgpack_enc(
-                (obj.__class__.__module__, obj.__class__.__name__, (obj.node, obj.arg)),
+                (obj.__class__.__module__, obj.__class__.__name__, args),
             ),
         )
     elif dataclasses.is_dataclass(obj):
@@ -498,6 +534,15 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
         raise TypeError(f"Object of type {obj.__class__.__name__} is not serializable")
 
 
+def _send_from_args(args: Sequence[Any]) -> Any:
+    # ya we have a cyclic import here ¯\_(ツ)_/¯
+    from langgraph.types import Send  # type: ignore
+
+    if len(args) == 2:
+        return Send(*args)
+    return Send(args[0], args[1], timeout=args[2])
+
+
 def _create_msgpack_ext_hook(
     allowed_modules: set[tuple[str, ...]] | Literal[True] | None,
 ) -> Callable[[int, bytes], Any]:
@@ -527,10 +572,13 @@ def _create_msgpack_ext_hook(
                     "name": name,
                 }
             )
-            logger.warning(
+            _warn_once(
+                _warned_unregistered_types,
+                key,
                 "Deserializing unregistered type %s.%s from checkpoint. "
                 "This will be blocked in a future version. "
-                "Add to allowed_msgpack_modules to silence: [(%r, %r)]",
+                "Set LANGGRAPH_STRICT_MSGPACK=true to block now, or add "
+                "to allowed_msgpack_modules to allow explicitly: [(%r, %r)]",
                 module,
                 name,
                 module,
@@ -548,7 +596,9 @@ def _create_msgpack_ext_hook(
                 "name": name,
             }
         )
-        logger.warning(
+        _warn_once(
+            _warned_blocked_types,
+            key,
             "Blocked deserialization of %s.%s - not in allowed_msgpack_modules. "
             "Add to allowed_msgpack_modules to allow: [(%r, %r)]",
             module,
@@ -581,7 +631,13 @@ def _create_msgpack_ext_hook(
         return False
 
     def ext_hook(code: int, data: bytes) -> Any:
-        if code == EXT_CONSTRUCTOR_SINGLE_ARG:
+        if code == EXT_DELTA_SNAPSHOT:
+            return _DeltaSnapshot(
+                ormsgpack.unpackb(
+                    data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
+                )
+            )
+        elif code == EXT_CONSTRUCTOR_SINGLE_ARG:
             try:
                 tup = ormsgpack.unpackb(
                     data, ext_hook=ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
@@ -602,6 +658,8 @@ def _create_msgpack_ext_hook(
                 )
                 if not _check_allowed(tup[0], tup[1]):
                     return tup[2]
+                if tup[0] == "langgraph.types" and tup[1] == "Send":
+                    return _send_from_args(tup[2])
                 # module, name, args
                 return getattr(importlib.import_module(tup[0]), tup[1])(*tup[2])
             except Exception:
@@ -715,9 +773,7 @@ def _msgpack_ext_hook_to_json(code: int, data: bytes) -> Any:
                 option=ormsgpack.OPT_NON_STR_KEYS,
             )
             if tup[0] == "langgraph.types" and tup[1] == "Send":
-                from langgraph.types import Send  # type: ignore
-
-                return Send(*tup[2])
+                return _send_from_args(tup[2])
             # module, name, args
             return tup[2]
         except Exception:

libs/checkpoint/langgraph/checkpoint/serde/types.py

@@ -1,6 +1,7 @@
 from collections.abc import Sequence
 from typing import (
     Any,
+    NamedTuple,
     Protocol,
     TypeVar,
     runtime_checkable,
@@ -14,6 +15,22 @@ INTERRUPT = "__interrupt__"
 RESUME = "__resume__"
 TASKS = "__pregel_tasks"
 
+
+class _DeltaSnapshot(NamedTuple):
+    """Snapshot blob for a DeltaChannel with finite snapshot_frequency.
+
+    Stored in checkpoint_blobs via the `EXT_DELTA_SNAPSHOT` msgpack ext code.
+    The ancestor walk in `BaseCheckpointSaver.get_delta_channel_history` terminates
+    when it encounters this type (any non-empty channel_values entry stops
+    the walk for that channel).
+
+    `from_checkpoint` reconstructs the channel value directly from `.value`
+    without replaying writes — the snapshot IS the accumulated state.
+    """
+
+    value: Any
+
+
 Value = TypeVar("Value", covariant=True)
 Update = TypeVar("Update", contravariant=True)
 C = TypeVar("C")

libs/checkpoint/langgraph/store/base/__init__.py

@@ -552,6 +552,14 @@ class TTLConfig(TypedDict, total=False):
     This can be overridden per-operation by explicitly setting `refresh_ttl`.
     Defaults to `True` if not configured.
     """
+    omit_expired: bool
+    """Whether to omit expired items from read operations.
+
+    If `True`, and if the store supports this option, expired items will not be
+    returned by `GET` or `SEARCH`, or included in namespace listings, even before
+    a TTL sweep deletes them.
+    Defaults to `False` if not configured.
+    """
     default_ttl: float | None
     """Default TTL (time-to-live) in minutes for new items.
     

libs/checkpoint/langgraph/store/base/batch.py

@@ -328,6 +328,9 @@ async def _run(
     store: weakref.ReferenceType[BaseStore],
 ) -> None:
     while item := await aqueue.get():
+        # don't run batch if the future is done (e.g. cancelled)
+        if item[0].done():
+            continue
         # check if store is still alive
         if s := store():
             try:
@@ -335,6 +338,9 @@ async def _run(
                 items = [item]
                 try:
                     while item := aqueue.get_nowait():
+                        # don't insert if the future is done (e.g. cancelled)
+                        if item[0].done():
+                            continue
                         items.append(item)
                 except asyncio.QueueEmpty:
                     pass

libs/checkpoint/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.2.0"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -18,7 +18,7 @@ dependencies = [
 
 [project.urls]
 Source = "https://github.com/langchain-ai/langgraph/tree/main/libs/checkpoint"
-Twitter = "https://x.com/LangChain"
+Twitter = "https://x.com/langchain_oss"
 Slack = "https://www.langchain.com/join-community"
 Reddit = "https://www.reddit.com/r/LangChain/"
 
@@ -37,7 +37,7 @@ test = [
 lint = [
   "ruff",
   "codespell",
-  "mypy",
+  "ty",
 ]
 dev = [
   {include-group = "test"},
@@ -59,23 +59,33 @@ lint.select = [
   "UP", # pyupgrade
   "B",  # flake8-bugbear
   "I",  # isort
+  "PLC0415",  # import-outside-top-level
+  "RUF100",  # unused noqa directive
   "UP", # pyupgrade
 ]
 lint.ignore = ["E501", "B008"]
+# PLC0415 (import-outside-top-level) is enforced in tests only. Library code
+# still has deferred imports that have not been reviewed, so it stays exempt
+# for now.
+lint.per-file-ignores = { "langgraph/**" = ["PLC0415"] }
 target-version = "py310"
 
+[tool.ty.rules]
+deprecated = "ignore"
+invalid-argument-type = "ignore"
+invalid-assignment = "ignore"
+invalid-key = "ignore"
+invalid-method-override = "ignore"
+invalid-return-type = "ignore"
+invalid-type-form = "ignore"
+redundant-cast = "ignore"
+unused-type-ignore-comment = "ignore"
+unresolved-attribute = "ignore"
+unresolved-import = "ignore"
+unsupported-operator = "ignore"
+
 [tool.pytest-watcher]
 now = true
 delay = 0.1
 runner_args = ["--ff", "-v", "--tb", "short"]
 patterns = ["*.py"]
-
-[tool.mypy]
-# https://mypy.readthedocs.io/en/stable/config_file.html
-disallow_untyped_defs = "True"
-explicit_package_bases = "True"
-warn_no_return = "False"
-warn_unused_ignores = "True"
-warn_redundant_casts = "True"
-allow_redefinition = "True"
-disable_error_code = "typeddict-item, return-value"

libs/checkpoint/tests/test_conformance_delta.py

@@ -0,0 +1,37 @@
+"""Run delta-channel conformance capabilities against InMemorySaver."""
+
+from __future__ import annotations
+
+import pytest
+
+conformance = pytest.importorskip(
+    "langgraph.checkpoint.conformance",
+    reason="langgraph-checkpoint-conformance not installed",
+)
+
+
+@pytest.mark.asyncio
+async def test_delta_channel_conformance():
+    # Imported inside the test: the module-level importorskip above is what
+    # makes these safe, so they cannot move to the top of the file.
+    from langgraph.checkpoint.conformance import validate  # noqa: PLC0415
+    from langgraph.checkpoint.conformance.initializer import (  # noqa: PLC0415
+        checkpointer_test,
+    )
+
+    from langgraph.checkpoint.memory import InMemorySaver  # noqa: PLC0415
+
+    @checkpointer_test(name="InMemorySaver")
+    async def mem_saver():
+        yield InMemorySaver()
+
+    report = await validate(
+        mem_saver,
+        capabilities={
+            "delta_channel_history",
+        },
+    )
+    for cap, result in report.results.items():
+        if result.passed is False:
+            details = "\n".join(result.failures or [])
+            pytest.fail(f"Capability {cap} failed:\n{details}")

libs/checkpoint/tests/test_encrypted.py

@@ -29,6 +29,8 @@ from langgraph.checkpoint.serde.jsonplus import (
     EXT_METHOD_SINGLE_ARG,
     JsonPlusSerializer,
     _msgpack_enc,
+    _warned_blocked_types,
+    _warned_unregistered_types,
 )
 
 
@@ -102,6 +104,13 @@ def test_msgpack_method_pathlib_blocked_encrypted_strict(
 class TestEncryptedSerializerMsgpackAllowlist:
     """Test msgpack allowlist behavior through EncryptedSerializer."""
 
+    @pytest.fixture(autouse=True)
+    def _reset_warned_types(self) -> None:
+        # Warning dedup state is process-global; reset per-test so each case
+        # sees a fresh slate and assertions about warning emission are stable.
+        _warned_unregistered_types.clear()
+        _warned_blocked_types.clear()
+
     def test_safe_types_no_warning(self, caplog: pytest.LogCaptureFixture) -> None:
         """Test safe types deserialize without warnings through encryption."""
         serde = _make_encrypted_serde()
@@ -298,8 +307,6 @@ class TestWithMsgpackAllowlistEncrypted:
             def loads_typed(self, data: tuple[str, bytes]) -> None:
                 return None
 
-        from langgraph.checkpoint.serde.base import CipherProtocol
-
         class DummyCipher(CipherProtocol):
             def encrypt(self, plaintext: bytes) -> tuple[str, bytes]:
                 return "dummy", plaintext

libs/checkpoint/tests/test_jsonplus.py

@@ -1,9 +1,12 @@
 import dataclasses
 import json
 import logging
+import os
 import pathlib
+import pickle
 import re
 import sys
+import tempfile
 import uuid
 from collections import deque
 from datetime import date, datetime, time, timezone
@@ -18,7 +21,7 @@ import ormsgpack
 import pandas as pd
 import pytest
 from langchain_core.documents.base import Document
-from langchain_core.messages import HumanMessage
+from langchain_core.messages import AIMessage, HumanMessage
 from pydantic import BaseModel, SecretStr
 from pydantic.v1 import BaseModel as BaseModelV1
 from pydantic.v1 import SecretStr as SecretStrV1
@@ -35,6 +38,8 @@ from langgraph.checkpoint.serde.jsonplus import (
     JsonPlusSerializer,
     _msgpack_enc,
     _msgpack_ext_hook_to_json,
+    _warned_blocked_types,
+    _warned_unregistered_types,
 )
 from langgraph.store.base import Item
 
@@ -331,6 +336,56 @@ def test_serde_jsonplus_bytes() -> None:
     assert serde.loads_typed(dumped) == some_bytes
 
 
+def test_lc2_json_safe_type_revives_without_allowlist() -> None:
+    """Old 'json' blobs with lc=2 for safe types must revive without an explicit allowlist.
+
+    Regression test for: https://github.com/langchain-ai/langgraph/issues/7498
+    Threads checkpointed before v1.0.1 (pre-msgpack) stored messages as lc=2 JSON
+    constructor dicts. Resuming those threads must reconstruct proper BaseMessage objects
+    rather than returning raw dicts that cause MESSAGE_COERCION_FAILURE in add_messages.
+    """
+
+    serde = JsonPlusSerializer()  # default: _allowed_json_modules=None
+
+    human_blob = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "human", "HumanMessage"],
+        "kwargs": {"content": "hello", "type": "human"},
+    }
+    ai_blob = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "kwargs": {"content": "hi there", "type": "ai"},
+    }
+    result = serde.loads_typed(("json", json.dumps([human_blob, ai_blob]).encode()))
+
+    assert len(result) == 2
+    assert isinstance(result[0], HumanMessage), (
+        f"Expected HumanMessage, got {type(result[0])}: {result[0]!r}\n"
+        "lc=2 JSON blobs for safe types must deserialize without an explicit allowlist"
+    )
+    assert result[0].content == "hello"
+    assert isinstance(result[1], AIMessage)
+    assert result[1].content == "hi there"
+
+
+def test_lc2_json_unknown_type_stays_blocked_without_allowlist() -> None:
+    """lc=2 JSON blobs for types NOT in SAFE_MSGPACK_TYPES still require an allowlist."""
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["pprint", "pprint"],
+        "kwargs": {"object": "HELLO"},
+    }
+    # No allowlist configured → raw dict returned (not raised, not reconstructed)
+    result = serde.loads_typed(("json", json.dumps(load).encode()))
+    assert isinstance(result, dict), "Unknown lc=2 type must stay as raw dict"
+    assert result.get("lc") == 2
+
+
 def test_deserde_invalid_module() -> None:
     serde = JsonPlusSerializer()
     load = {
@@ -345,6 +400,186 @@ def test_deserde_invalid_module() -> None:
     serde.loads_typed(("json", json.dumps(load).encode("utf-8")))
 
 
+def test_lc2_json_method_field_is_ignored() -> None:
+    """The `method` field on lc=2 envelopes is ignored.
+
+    Regression test for GHSA-fjqc-hq36-qh5p: `_revive_lc2` previously resolved
+    `getattr(cls, method)` from the envelope, which let an attacker pivot a
+    safe pydantic class (e.g., AIMessage) to `parse_raw(..., allow_pickle=True)`
+    and reach `pickle.loads`. Revival now uses only the default constructor.
+
+    Verifies that an envelope carrying ``method="parse_raw"`` does not dispatch
+    to that method: the result is whatever ``AIMessage(*args, **kwargs)`` would
+    produce, which proves the default constructor ran instead of ``parse_raw``.
+    """
+
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": "parse_raw",
+        "args": ["default-ctor-ran"],
+        "kwargs": {"content_type": "application/pickle", "allow_pickle": True},
+    }
+    result = serde._revive_lc2(load)
+    # Default constructor accepts `content` as first positional arg. If parse_raw
+    # had been invoked instead, it would have attempted JSON/pickle parsing and
+    # raised (or executed the pickle gadget); neither would produce this result.
+    assert isinstance(result, AIMessage)
+    assert result.content == "default-ctor-ran"
+
+
+def test_lc2_json_method_field_is_ignored_for_allowlisted_types() -> None:
+    """The `method` field is ignored even when the class is explicitly allowlisted.
+
+    A user who configures ``allowed_json_modules`` for a class no longer gets
+    method dispatch as a side effect. Revival is restricted to the default
+    constructor regardless of how the class reached the revival path.
+    """
+
+    serde = JsonPlusSerializer(
+        allowed_json_modules=[("langchain_core.messages.ai", "AIMessage")]
+    )
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": "parse_raw",
+        "args": ["default-ctor-ran"],
+    }
+    result = serde._revive_lc2(load)
+    assert isinstance(result, AIMessage)
+    assert result.content == "default-ctor-ran"
+
+
+def test_lc2_json_safe_type_init_still_works() -> None:
+    """SAFE-type lc=2 revival without a `method` field still constructs the class."""
+
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "kwargs": {"content": "hi", "type": "ai"},
+    }
+    result = serde._revive_lc2(load)
+    assert isinstance(result, AIMessage)
+    assert result.content == "hi"
+
+
+def test_lc2_json_legacy_pydantic_method_list_falls_back_to_default() -> None:
+    """Legacy ``method=(None, "construct")`` envelopes still revive via the default ctor.
+
+    Pre-October-2025 langgraph emitted pydantic models with
+    ``method=(None, "construct")`` meaning "try default constructor, fall back
+    to pydantic ``construct``". The first entry (``None``) was always the
+    default constructor, which is what we now do unconditionally. Envelopes of
+    this shape continue to revive correctly as long as the default constructor
+    accepts the serialized kwargs.
+    """
+
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": [None, "construct"],
+        "kwargs": {"content": "legacy", "type": "ai"},
+    }
+    result = serde._revive_lc2(load)
+    assert isinstance(result, AIMessage)
+    assert result.content == "legacy"
+
+
+def test_lc2_json_legacy_construct_payload_logs_warning_when_default_init_rejects(
+    caplog: pytest.LogCaptureFixture,
+) -> None:
+    """Legacy `method=[None, "construct"]` envelopes whose kwargs the default
+    `__init__` rejects now revive to `None` and emit an observable warning.
+
+    Pre-October-2025 langgraph emitted pydantic payloads with
+    `method=[None, "construct"]` so the reviver could fall back to
+    `cls.construct(**kwargs)` when the default constructor raised a
+    validation error. That fallback was removed with method-field dispatch
+    (GHSA-fjqc-hq36-qh5p), so these payloads now silently fail validation. A
+    `logger.warning` makes the regression observable to operators instead of
+    letting the envelope quietly degrade to its raw-dict form.
+    """
+    serde = JsonPlusSerializer()
+    load = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        # Legacy two-entry method tuple: try default ctor, fall back to construct.
+        "method": [None, "construct"],
+        # ``type="not-a-real-message-type"`` fails AIMessage's Literal["ai"]
+        # validator under the default constructor. Before the GHSA patch this
+        # would have fallen back to ``cls.construct(**kwargs)``; now it must
+        # return None and log.
+        "kwargs": {"content": "legacy", "type": "not-a-real-message-type"},
+    }
+
+    with caplog.at_level(logging.WARNING, logger="langgraph.checkpoint.serde.jsonplus"):
+        result = serde._revive_lc2(load)
+
+    assert result is None, (
+        "Legacy method=[None, 'construct'] payloads with kwargs the default "
+        "ctor rejects must now return None (no construct() fallback)."
+    )
+
+    matching = [
+        r
+        for r in caplog.records
+        if r.name == "langgraph.checkpoint.serde.jsonplus"
+        and r.levelno == logging.WARNING
+        and "langchain_core.messages.ai.AIMessage" in r.getMessage()
+        and "legacy_method_field=True" in r.getMessage()
+    ]
+    assert matching, (
+        "Expected a WARNING from langgraph.checkpoint.serde.jsonplus "
+        "referencing the class id and legacy_method_field=True; "
+        f"got records: {[(r.name, r.levelname, r.getMessage()) for r in caplog.records]}"
+    )
+
+
+def test_lc2_json_safe_type_pickle_payload_does_not_execute() -> None:
+    """End-to-end: a `parse_raw` pickle gadget payload on a SAFE type must not run.
+
+    With method dispatch removed from `_revive_lc2`, the gadget bytes are never
+    passed to `parse_raw` and therefore never reach `pickle.loads`.
+    """
+
+    marker = tempfile.NamedTemporaryFile(
+        prefix="lc2_block_proof_", suffix=".out", delete=False
+    ).name
+    os.remove(marker)  # ensure absent before the test runs
+
+    class _Gadget:
+        def __reduce__(self) -> tuple:
+            return (os.system, (f"touch {marker}",))
+
+    gadget_bytes = pickle.dumps(_Gadget(), protocol=0).decode("latin1")
+    envelope = {
+        "lc": 2,
+        "type": "constructor",
+        "id": ["langchain_core", "messages", "ai", "AIMessage"],
+        "method": "parse_raw",
+        "args": [gadget_bytes],
+        "kwargs": {"content_type": "application/pickle", "allow_pickle": True},
+    }
+
+    serde = JsonPlusSerializer()
+    try:
+        serde.loads_typed(("json", json.dumps(envelope).encode()))
+    except Exception:
+        pass
+
+    assert not os.path.exists(marker), (
+        "Pickle gadget executed via parse_raw on AIMessage lc=2 envelope"
+    )
+
+
 def test_serde_jsonplus_bytearray() -> None:
     serde = JsonPlusSerializer()
 
@@ -580,6 +815,14 @@ def test_msgpack_safe_types_no_warning(caplog: pytest.LogCaptureFixture) -> None
         assert result is not None
 
 
+@pytest.fixture(autouse=True)
+def _reset_warned_types() -> None:
+    # Warning dedup state is process-global; reset per-test so each case sees
+    # a fresh slate and assertions about warning emission are stable.
+    _warned_unregistered_types.clear()
+    _warned_blocked_types.clear()
+
+
 def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) -> None:
     """Pydantic models not in allowlist should log warning but still deserialize."""
     current = _lg_msgpack.STRICT_MSGPACK_ENABLED
@@ -595,6 +838,12 @@ def test_msgpack_pydantic_warns_by_default(caplog: pytest.LogCaptureFixture) ->
     assert "unregistered type" in caplog.text.lower()
     assert "allowed_msgpack_modules" in caplog.text
     assert result == obj
+
+    # Second deserialization of the same type should NOT produce another warning
+    caplog.clear()
+    result2 = serde.loads_typed(dumped)
+    assert "unregistered type" not in caplog.text.lower()
+    assert result2 == obj
     _lg_msgpack.STRICT_MSGPACK_ENABLED = current
 
 
@@ -639,7 +888,6 @@ def test_msgpack_allowlist_silences_warning(caplog: pytest.LogCaptureFixture) ->
 
 def test_msgpack_none_blocks_unregistered(caplog: pytest.LogCaptureFixture) -> None:
     """allowed_msgpack_modules=None should block unregistered types."""
-
     serde = JsonPlusSerializer(allowed_msgpack_modules=None)
 
     obj = MyPydantic(foo="test", bar=42, inner=InnerPydantic(hello="world"))
@@ -657,7 +905,6 @@ def test_msgpack_allowlist_blocks_non_listed(
     caplog: pytest.LogCaptureFixture,
 ) -> None:
     """Allowlists should block unregistered types even if msgpack is enabled."""
-
     serde = JsonPlusSerializer(
         allowed_msgpack_modules=[("tests.test_jsonplus", "MyPydantic")]
     )

libs/checkpoint/tests/test_memory.py

@@ -1,3 +1,4 @@
+import asyncio
 import logging
 from typing import Any
 
@@ -12,13 +13,25 @@ from langgraph.checkpoint.base import (
     empty_checkpoint,
 )
 from langgraph.checkpoint.memory import InMemorySaver
-from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+from langgraph.checkpoint.serde.jsonplus import (
+    JsonPlusSerializer,
+    _warned_blocked_types,
+    _warned_unregistered_types,
+)
 
 
 class MemoryPydantic(BaseModel):
     foo: str
 
 
+@pytest.fixture(autouse=True)
+def _reset_warned_types() -> None:
+    # Warning dedup state is process-global; reset per-test so each case sees
+    # a fresh slate and assertions about warning emission are stable.
+    _warned_unregistered_types.clear()
+    _warned_blocked_types.clear()
+
+
 class TestMemorySaver:
     @pytest.fixture(autouse=True)
     def setup(self) -> None:
@@ -196,8 +209,6 @@ class TestMemorySaver:
 
 
 async def test_memory_saver() -> None:
-    from langgraph.checkpoint.memory import InMemorySaver
-
     memory_saver = InMemorySaver()
     assert isinstance(memory_saver, InMemorySaver)
 
@@ -308,3 +319,391 @@ def test_memory_saver_with_allowlist_proxy_isolated() -> None:
     assert direct is not None
     expected = obj.model_dump() if hasattr(obj, "model_dump") else obj.dict()
     assert direct.checkpoint["channel_values"]["foo"] == expected
+
+
+class TestInMemorySaverDeltaChannel:
+    def test_load_blobs_omits_delta_channel(self) -> None:
+        """_load_blobs omits delta channels (stored as 'empty'); reconstruction deferred."""
+        saver = InMemorySaver()
+
+        thread_id, ns, channel = "t1", "", "messages"
+        v1 = "00000000000000000000000000000001.0000000000000000"
+
+        saver.blobs[(thread_id, ns, channel, v1)] = ("empty", b"")
+
+        result = saver._load_blobs(thread_id, ns, {channel: v1})
+        assert channel not in result
+
+    def test_get_channel_writes_collects_ancestor_writes_only(self) -> None:
+        """`get_delta_channel_history` collects ancestor writes oldest→newest, and
+        excludes writes stored at the target checkpoint itself (those are
+        pending writes for the next step, applied separately by pregel).
+
+        When the walk reaches the root without finding any stored value for
+        the channel, the per-channel entry has no `seed` key (TypedDict
+        absence indicates "start empty").
+        """
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp2 = empty_checkpoint()
+        cp2["id"] = "cp2"
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+        }
+        # Writes stored at cp1 produced the cp1 snapshot; part of history.
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "hi"}),
+            "",
+        )
+        # Writes stored at cp2 are pending — they will produce cp3 when the
+        # step that loaded cp2 completes. They MUST NOT appear in the
+        # reconstructed snapshot value at cp2.
+        saver.writes[(thread_id, ns, "cp2")][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed({"content": "pending"}),
+            "",
+        )
+
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": "cp2",
+            }
+        }
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+        # Walk reached the root without finding a stored value → no `seed` key.
+        assert "seed" not in result
+        values = [v for _, _, v in result["writes"]]
+        assert values == [{"content": "hi"}]
+
+    def test_get_channel_writes_at_root_returns_empty(self) -> None:
+        """Reconstructing the root checkpoint's state: no ancestors → []."""
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        saver.storage[thread_id][ns] = {
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), None),
+        }
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "pending"}),
+            "",
+        )
+
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": "cp1",
+            }
+        }
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+        # No ancestors → no seed found, no writes accumulated.
+        assert "seed" not in result
+        assert result["writes"] == []
+
+
+class TestBaseFallbackGetChannelWrites:
+    """Exercises the `BaseCheckpointSaver.get_delta_channel_history` default
+    implementation — the path third-party savers inherit when they don't
+    override `get_delta_channel_history` themselves.
+
+    Regression guard for a bug where the fallback passed the caller's config
+    (with `checkpoint_id`) straight to `self.list()`, which most savers
+    collapse to a single row — causing the fallback to return `[]`.
+    """
+
+    def _build_saver_with_chain(self) -> tuple[InMemorySaver, str, str]:
+        """Build an InMemorySaver with a 3-checkpoint chain and per-step writes
+        for a `messages` channel.
+
+        Returns `(saver, thread_id, namespace)`. The saver subclass deletes the
+        InMemorySaver override so the base class fallback is exercised.
+        """
+
+        class _ThirdPartyStyleSaver(InMemorySaver):
+            get_delta_channel_history = (
+                InMemorySaver.__mro__[1].get_delta_channel_history  # type: ignore[attr-defined]
+            )
+            aget_delta_channel_history = (
+                InMemorySaver.__mro__[1].aget_delta_channel_history  # type: ignore[attr-defined]
+            )
+
+        saver = _ThirdPartyStyleSaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        cp0 = empty_checkpoint()
+        cp0["id"] = "00000000000000000000000000000001.0000000000000000"
+        cp1 = empty_checkpoint()
+        cp1["id"] = "00000000000000000000000000000002.0000000000000000"
+        cp2 = empty_checkpoint()
+        cp2["id"] = "00000000000000000000000000000003.0000000000000000"
+        saver.storage[thread_id][ns] = {
+            cp0["id"]: (serde.dumps_typed(cp0), serde.dumps_typed({}), None),
+            cp1["id"]: (serde.dumps_typed(cp1), serde.dumps_typed({}), cp0["id"]),
+            cp2["id"]: (serde.dumps_typed(cp2), serde.dumps_typed({}), cp1["id"]),
+        }
+        # Writes under cp0 produced cp1's state; writes under cp1 produced cp2's.
+        saver.writes[(thread_id, ns, cp0["id"])][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed({"content": "first"}),
+            "",
+        )
+        saver.writes[(thread_id, ns, cp1["id"])][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed({"content": "second"}),
+            "",
+        )
+        return saver, thread_id, ns
+
+    def test_fallback_returns_ancestor_writes_oldest_first(self) -> None:
+        saver, thread_id, ns = self._build_saver_with_chain()
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        result = saver.get_delta_channel_history(config=config, channels=["messages"])[
+            "messages"
+        ]
+
+        # Walk reached root without a stored value → `seed` key absent.
+        assert "seed" not in result
+        values = [v for _, _, v in result["writes"]]
+        assert values == [{"content": "first"}, {"content": "second"}]
+
+    async def test_async_fallback_returns_ancestor_writes_oldest_first(self) -> None:
+        saver, thread_id, ns = self._build_saver_with_chain()
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        result = (
+            await saver.aget_delta_channel_history(config=config, channels=["messages"])
+        )["messages"]
+
+        assert "seed" not in result
+        values = [v for _, _, v in result["writes"]]
+        assert values == [{"content": "first"}, {"content": "second"}]
+
+    async def test_async_fallback_concurrent_tasks_do_not_interfere(self) -> None:
+        """Regression: the re-entrancy guard must be task-local, not thread-local.
+
+        Two concurrent `aget_delta_channel_history` calls on the same event-loop
+        thread must each see their full reconstructed writes. A
+        `threading.local()` guard would let whichever task set it first
+        short-circuit the other to `writes=[]`.
+        """
+
+        saver, thread_id, ns = self._build_saver_with_chain()
+
+        # Force the two tasks to interleave across the `set(True)` boundary:
+        # each `aget_tuple` yields control, so if the guard were thread-local
+        # the second task would observe `active=True` set by the first.
+        orig_aget_tuple = saver.aget_tuple
+
+        async def slow_aget_tuple(config: RunnableConfig) -> Any:
+            await asyncio.sleep(0)
+            return await orig_aget_tuple(config)
+
+        saver.aget_tuple = slow_aget_tuple  # type: ignore[method-assign]
+
+        target_id = "00000000000000000000000000000003.0000000000000000"
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target_id,
+            }
+        }
+
+        results = await asyncio.gather(
+            saver.aget_delta_channel_history(config=config, channels=["messages"]),
+            saver.aget_delta_channel_history(config=config, channels=["messages"]),
+        )
+
+        expected_values = [{"content": "first"}, {"content": "second"}]
+        for result_map in results:
+            result = result_map["messages"]
+            assert "seed" not in result
+            values = [v for _, _, v in result["writes"]]
+            assert values == expected_values
+
+
+class TestPreDeltaBlobTerminator:
+    """Verify the pre-delta blob terminator: when the ancestor walk hits a
+    checkpoint whose blob for the channel is a real value, reconstruction
+    seeds from it and stops. This guards
+
+      * back-compat: a thread written by pre-delta code, then extended under
+        delta — reconstruction must return the correct value without walking
+        past the last pre-delta ancestor;
+      * perf: without the terminator, every reconstruct-after-migration would
+        walk all the way to the thread root.
+
+    Under the new public API a found seed populates `seed` in the
+    `DeltaChannelHistory` TypedDict; absence of the `seed` key means the walk
+    reached root without finding a stored value.
+    """
+
+    def _build_mixed_thread(self) -> tuple[InMemorySaver, str, str, str, str]:
+        """Four-checkpoint chain spanning the migration boundary:
+
+        * `cp0` — pre-delta ancestor OLDER than the seed. Its write
+          (`OLDER-WRITE`) is already folded into `cp1`'s stored value, so the
+          walk must terminate at `cp1` and never reach it.
+        * `cp1` — pre-delta, blob `["A"]`. That value is the state ENTERING
+          `cp1`; the write stored under `cp1` (`PRE-DELTA-WRITE`) is what
+          produced `cp2` and is NOT subsumed by the blob.
+        * `cp2` — delta-era, no stored value, write `B`.
+        * `cp3` — target, delta-era, write `PENDING-AT-TARGET`.
+
+        Reconstructing at `cp3` must yield seed `["A"]` plus writes
+        `["PRE-DELTA-WRITE", "B"]`.
+
+        Returns `(saver, thread_id, ns, channel, cp3_id)`.
+        """
+        saver = InMemorySaver()
+        serde = JsonPlusSerializer()
+        thread_id, ns, channel = "t1", "", "messages"
+
+        v0 = "00000000000000000000000000000000.0"
+        v1 = "00000000000000000000000000000001.0"
+        v2 = "00000000000000000000000000000002.0"
+        v3 = "00000000000000000000000000000003.0"
+
+        # Pre-delta: cp0 and cp1 stored real blobs for the channel.
+        saver.blobs[(thread_id, ns, channel, v0)] = serde.dumps_typed([])
+        saver.blobs[(thread_id, ns, channel, v1)] = serde.dumps_typed(["A"])
+        # Delta-era: cp2 and cp3 store "empty"; real writes in checkpoint_writes.
+        saver.blobs[(thread_id, ns, channel, v2)] = ("empty", b"")
+        saver.blobs[(thread_id, ns, channel, v3)] = ("empty", b"")
+
+        cp0 = empty_checkpoint()
+        cp0["id"] = "cp0"
+        cp0["channel_versions"][channel] = v0
+        cp1 = empty_checkpoint()
+        cp1["id"] = "cp1"
+        cp1["channel_versions"][channel] = v1
+        cp2 = empty_checkpoint()
+        cp2["id"] = "cp2"
+        cp2["channel_versions"][channel] = v2
+        cp3 = empty_checkpoint()
+        cp3["id"] = "cp3"
+        cp3["channel_versions"][channel] = v3
+
+        saver.storage[thread_id][ns] = {
+            "cp0": (serde.dumps_typed(cp0), serde.dumps_typed({}), None),
+            "cp1": (serde.dumps_typed(cp1), serde.dumps_typed({}), "cp0"),
+            "cp2": (serde.dumps_typed(cp2), serde.dumps_typed({}), "cp1"),
+            "cp3": (serde.dumps_typed(cp3), serde.dumps_typed({}), "cp2"),
+        }
+        # Write under cp0 is older than the seed — cp1's blob already folded
+        # it in, and the terminator must stop before reaching it.
+        saver.writes[(thread_id, ns, "cp0")][("task0", 0)] = (
+            "task0",
+            channel,
+            serde.dumps_typed("OLDER-WRITE"),
+            "",
+        )
+        # Write under cp1 postdates cp1's blob (it is what produced cp2, which
+        # stores no value of its own) and MUST be replayed.
+        saver.writes[(thread_id, ns, "cp1")][("task1", 0)] = (
+            "task1",
+            channel,
+            serde.dumps_typed("PRE-DELTA-WRITE"),
+            "",
+        )
+        saver.writes[(thread_id, ns, "cp2")][("task2", 0)] = (
+            "task2",
+            channel,
+            serde.dumps_typed("B"),
+            "",
+        )
+        saver.writes[(thread_id, ns, "cp3")][("task3", 0)] = (
+            "task3",
+            channel,
+            serde.dumps_typed("PENDING-AT-TARGET"),
+            "",
+        )
+        return saver, thread_id, ns, channel, "cp3"
+
+    def test_seed_from_pre_delta_ancestor_blob(self) -> None:
+        saver, thread_id, ns, channel, target = self._build_mixed_thread()
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target,
+            }
+        }
+
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+
+        # Seed came from the pre-delta blob at cp1.
+        assert result["seed"] == ["A"]
+        # The seed ancestor's own write and the delta-era write from cp2 both
+        # replay through the reducer on top of the seed, oldest first. cp3 is
+        # the target — its own write is pending for the NEXT step and must be
+        # excluded.
+        values = [v for _, _, v in result["writes"]]
+        assert values == ["PRE-DELTA-WRITE", "B"]
+
+    def test_seed_bounds_walk_without_dropping_its_own_writes(self) -> None:
+        """The seed terminator bounds the walk: writes at ancestors OLDER than
+        the seed are already folded into the seed value and must not be
+        replayed. The seed ancestor's own write is not one of them — it
+        postdates the stored value and produced the next checkpoint.
+        """
+        saver, thread_id, ns, channel, target = self._build_mixed_thread()
+        config: RunnableConfig = {
+            "configurable": {
+                "thread_id": thread_id,
+                "checkpoint_ns": ns,
+                "checkpoint_id": target,
+            }
+        }
+
+        result = saver.get_delta_channel_history(config=config, channels=[channel])[
+            channel
+        ]
+
+        values = [v for _, _, v in result["writes"]]
+        # Older than the seed — subsumed by cp1's blob, so the walk stops first.
+        assert "OLDER-WRITE" not in values
+        # Stored AT the seed ancestor — not subsumed, so it must be replayed.
+        assert "PRE-DELTA-WRITE" in values
+        # And the pending write at the target is never folded in.
+        assert "PENDING-AT-TARGET" not in values

libs/checkpoint/tests/test_store.py

@@ -1,4 +1,3 @@
-# mypy: disable-error-code="operator"
 import asyncio
 import json
 from collections.abc import Iterable

libs/checkpoint/uv.lock

@@ -2,7 +2,8 @@ version = 1
 revision = 3
 requires-python = ">=3.10"
 resolution-markers = [
-    "python_full_version >= '3.12'",
+    "python_full_version >= '3.15'",
+    "python_full_version >= '3.12' and python_full_version < '3.15'",
     "python_full_version == '3.11.*'",
     "python_full_version < '3.11'",
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+version = "1.5.2"
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     { name = "jsonpatch" },
+    { name = "langchain-protocol" },
     { name = "langsmith" },
     { name = "packaging" },
     { name = "pydantic" },
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+version = "0.0.18"
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 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.1"
+version = "4.2.0"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
@@ -297,7 +311,6 @@ dependencies = [
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     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
     { name = "numpy", version = "2.2.6", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.11'" },
     { name = "numpy", version = "2.4.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
     { name = "pandas" },
@@ -309,11 +322,12 @@ dev = [
     { name = "pytest-watcher" },
     { name = "redis" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 lint = [
     { name = "codespell" },
-    { name = "mypy" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 test = [
     { name = "dataclasses-json" },
@@ -338,7 +352,6 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
     { name = "numpy" },
     { name = "pandas" },
     { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
@@ -349,11 +362,12 @@ dev = [
     { name = "pytest-watcher" },
     { name = "redis" },
     { name = "ruff" },
+    { name = "ty" },
 ]
 lint = [
     { name = "codespell" },
-    { name = "mypy" },
     { name = "ruff" },
+    { name = "ty" },
 ]
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     { name = "dataclasses-json" },
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+version = "0.8.18"
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@@ -379,84 +393,13 @@ dependencies = [
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     { name = "requests-toolbelt" },
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+
 [[package]]
 name = "zstandard"
 version = "0.25.0"

libs/cli/Makefile

@@ -16,21 +16,19 @@ test-integration:
 
 # Define a variable for Python and notebook files.
 PYTHON_FILES=.
-MYPY_CACHE=.mypy_cache
 lint format: PYTHON_FILES=.
 lint_diff format_diff: PYTHON_FILES=$(shell git diff --name-only --relative --diff-filter=d main . | grep -E '\.py$$|\.ipynb$$')
 lint_package: PYTHON_FILES=langgraph_cli
 lint_tests: PYTHON_FILES=tests
-lint_tests: MYPY_CACHE=.mypy_cache_test
 
 lint lint_diff lint_package lint_tests:
 	uv run ruff check .
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff format $(PYTHON_FILES) --diff
 	[ "$(PYTHON_FILES)" = "" ] || uv run ruff check --select I $(PYTHON_FILES)
-	[ "$(PYTHON_FILES)" = "" ] || mkdir -p $(MYPY_CACHE) || uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	[ "$(PYTHON_FILES)" = "" ] || uv run ty check $(PYTHON_FILES)
 
 type:
-	mkdir -p $(MYPY_CACHE) && uv run mypy $(PYTHON_FILES) --cache-dir $(MYPY_CACHE)
+	uv run ty check $(PYTHON_FILES)
 
 format format_diff:
 	uv run ruff format $(PYTHON_FILES)

libs/cli/README.md

@@ -1,29 +1,47 @@
 # LangGraph CLI
 
-The official command-line interface for LangGraph, providing tools to create, develop, and deploy LangGraph applications.
+[![PyPI - Version](https://img.shields.io/pypi/v/langgraph-cli?label=%20)](https://pypi.org/project/langgraph-cli/#history)
+[![PyPI - License](https://img.shields.io/pypi/l/langgraph-cli)](https://opensource.org/licenses/MIT)
+[![PyPI - Downloads](https://img.shields.io/pepy/dt/langgraph-cli)](https://pypistats.org/packages/langgraph-cli)
+[![Twitter](https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain)](https://x.com/langchain_oss)
 
-## Installation
+To help you ship LangGraph apps to production faster, check out [LangSmith](https://www.langchain.com/langsmith).
+[LangSmith](https://www.langchain.com/langsmith) is a unified developer platform for building, testing, and monitoring LLM applications.
+
+## Quick Install
 
-Install via pip:
 ```bash
-pip install langgraph-cli
+uv add langgraph-cli
 ```
 
+## 🤔 What is this?
+
+The LangGraph CLI is the official command-line interface for LangGraph. It provides tools to create, develop, build, and run LangGraph applications locally or in Docker.
+
+## 📖 Documentation
+
+For full documentation, see the [LangGraph CLI reference](https://reference.langchain.com/python/langgraph-cli). For conceptual guides and tutorials, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview).
+
 For development mode with hot reloading:
+
 ```bash
-pip install "langgraph-cli[inmem]"
+uv add "langgraph-cli[inmem]"
 ```
 
 ## Commands
 
 ### `langgraph new` 🌱
-Create a new LangGraph project from a template
+
+Create a new LangGraph project from a template.
+
 ```bash
 langgraph new [PATH] --template TEMPLATE_NAME
 ```
 
 ### `langgraph dev` 🏃‍♀️
-Run LangGraph API server in development mode with hot reloading
+
+Run LangGraph API server in development mode with hot reloading.
+
 ```bash
 langgraph dev [OPTIONS]
   --host TEXT                 Host to bind to (default: 127.0.0.1)
@@ -35,7 +53,9 @@ langgraph dev [OPTIONS]
 ```
 
 ### `langgraph up` 🚀
-Launch LangGraph API server in Docker
+
+Launch LangGraph API server in Docker.
+
 ```bash
 langgraph up [OPTIONS]
   -p, --port INTEGER        Port to expose (default: 8123)
@@ -47,7 +67,9 @@ langgraph up [OPTIONS]
 ```
 
 ### `langgraph build`
-Build a Docker image for your LangGraph application
+
+Build a Docker image for your LangGraph application.
+
 ```bash
 langgraph build -t IMAGE_TAG [OPTIONS]
   --platform TEXT          Target platforms (e.g., linux/amd64,linux/arm64)
@@ -56,7 +78,9 @@ langgraph build -t IMAGE_TAG [OPTIONS]
 ```
 
 ### `langgraph dockerfile`
-Generate a Dockerfile for custom deployments
+
+Generate a Dockerfile for custom deployments.
+
 ```bash
 langgraph dockerfile SAVE_PATH [OPTIONS]
   -c, --config FILE       Config file path
@@ -68,18 +92,18 @@ The CLI uses a `langgraph.json` configuration file with these key settings:
 
 ```json
 {
-  "dependencies": ["langchain_openai", "./your_package"],  // Required: Package dependencies
+  "dependencies": ["langchain_openai", "./your_package"],
   "graphs": {
-    "my_graph": "./your_package/file.py:graph"            // Required: Graph definitions
+    "my_graph": "./your_package/file.py:graph"
   },
-  "env": "./.env",                                        // Optional: Environment variables
-  "python_version": "3.11",                               // Optional: Python version (3.11/3.12)
-  "pip_config_file": "./pip.conf",                        // Optional: pip configuration
-  "dockerfile_lines": []                                  // Optional: Additional Dockerfile commands
+  "env": "./.env",
+  "python_version": "3.11",
+  "pip_config_file": "./pip.conf",
+  "dockerfile_lines": []
 }
 ```
 
-See the [full documentation](https://langchain-ai.github.io/langgraph/cloud/reference/cli/) for detailed configuration options.
+See the [full documentation](https://reference.langchain.com/python/langgraph-cli) for detailed configuration options.
 
 ## Development
 
@@ -87,19 +111,26 @@ To develop the CLI itself:
 
 1. Clone the repository
 2. Navigate to the CLI directory: `cd libs/cli`
-3. Install development dependencies: `uv pip install`
+3. Install development dependencies: `uv sync`
 4. Make your changes to the CLI code
 5. Test your changes:
-   ```bash
-   # Run CLI commands directly
-   uv run langgraph --help
-   
-   # Or use the examples
-   cd examples
-   uv pip install
-   uv run langgraph dev  # or other commands
-   ```
 
-## License
+```bash
+# Run CLI commands directly
+uv run langgraph --help
 
-This project is licensed under the terms specified in the repository's LICENSE file.
+# Or use the examples
+cd examples
+uv sync
+uv run langgraph dev  # or other commands
+```
+
+## 📕 Releases & Versioning
+
+See our [Releases](https://docs.langchain.com/oss/python/release-policy) and [Versioning](https://docs.langchain.com/oss/python/versioning) policies.
+
+## 💁 Contributing
+
+As an open-source project in a rapidly developing field, we are extremely open to contributions, whether it be in the form of a new feature, improved infrastructure, or better documentation.
+
+For detailed information on how to contribute, see the [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview).

libs/cli/examples/graph_prerelease_reqs/deps/additional_deps/pyproject.toml

@@ -5,5 +5,5 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langgraph==1.0.8"
+  "langgraph==1.1.5"
 ]

libs/cli/examples/graph_prerelease_reqs/deps/zuper_deps/pyproject.toml

@@ -5,5 +5,5 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.0.1"
+  "langchain-openai==1.1.14"
 ]

libs/cli/examples/graph_prerelease_reqs/pyproject.toml

@@ -5,9 +5,9 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.0.0a2",
-  "langchain-anthropic==1.0.0a5",
-  "langgraph==1.0.8"
+  "langchain-openai==1.1.14",
+  "langchain-anthropic==1.4.6",
+  "langgraph==1.1.5"
 ]
 
 [tool.uv]

libs/cli/examples/graph_prerelease_reqs_fail/pyproject.toml

@@ -5,7 +5,7 @@ description = "Test for prerelease stuff"
 readme = "README.md"
 requires-python = ">=3.10"
 dependencies = [
-  "langchain-openai==1.0.0a2",
-  "langgraph==1.0.0a2",
+  "langchain-openai==1.1.14",
+  "langgraph==1.1.2",
   "langchain_community>=0.3.0",
 ]

libs/cli/examples/graphs/storm.py

@@ -236,7 +236,7 @@ def swap_roles(state: InterviewState, name: str):
     converted = []
     for message in state["messages"]:
         if isinstance(message, AIMessage) and message.name != name:
-            message = HumanMessage(**message.dict(exclude={"type"}))
+            message = HumanMessage(**message.model_dump(exclude={"type"}))
         converted.append(message)
     return {"messages": converted}
 

libs/cli/generate_schema.py

@@ -159,8 +159,8 @@ def generate_schema():
         if k not in python_specific_props and k not in node_specific_props
     ]
 
-    # Create Python schema with python_version and pip_config_file
-    python_schema = {
+    # Create legacy Python schema with python_version and pip_config_file
+    legacy_python_schema = {
         "type": "object",
         "properties": {
             # Include Python-specific properties
@@ -170,10 +170,45 @@ def generate_schema():
         },
         "required": ["dependencies", "graphs"],
     }
+    legacy_python_schema["properties"]["pip_installer"] = {
+        "anyOf": [
+            {"type": "string", "enum": ["auto", "pip", "uv"]},
+            {"type": "null"},
+        ]
+    }
+
+    uv_source_python_schema = {
+        "type": "object",
+        "properties": {
+            **{
+                k: config_schema["properties"][k].copy()
+                for k in python_specific_props + common_props
+            },
+        },
+        "required": ["graphs", "source"],
+    }
+    # source must be a UvSource object (not null)
+    uv_source_python_schema["properties"]["source"] = {"$ref": "#/$defs/UvSource"}
+    uv_source_python_schema["properties"]["pip_installer"] = {
+        "anyOf": [
+            {"type": "string", "enum": ["auto", "pip", "uv"]},
+            {"type": "null"},
+        ]
+    }
 
     # Add enum constraint for python_version
-    if "python_version" in python_schema["properties"]:
-        python_schema["properties"]["python_version"]["enum"] = ["3.11", "3.12", "3.13"]
+    if "python_version" in legacy_python_schema["properties"]:
+        legacy_python_schema["properties"]["python_version"]["enum"] = [
+            "3.11",
+            "3.12",
+            "3.13",
+        ]
+    if "python_version" in uv_source_python_schema["properties"]:
+        uv_source_python_schema["properties"]["python_version"]["enum"] = [
+            "3.11",
+            "3.12",
+            "3.13",
+        ]
 
     # Create Node.js schema with node_version
     node_schema = {
@@ -186,6 +221,12 @@ def generate_schema():
         },
         "required": ["node_version", "graphs"],
     }
+    node_schema["properties"]["pip_installer"] = {
+        "anyOf": [
+            {"type": "string", "enum": ["auto", "pip", "uv"]},
+            {"type": "null"},
+        ]
+    }
 
     # Add enum constraint for node_version
     if "node_version" in node_schema["properties"]:
@@ -202,7 +243,11 @@ def generate_schema():
         ]
 
     # Replace the Config schema with a oneOf constraint
-    config_schema["oneOf"] = [python_schema, node_schema]
+    config_schema["oneOf"] = [
+        legacy_python_schema,
+        uv_source_python_schema,
+        node_schema,
+    ]
 
     # Remove the properties field as it's now defined in the oneOf subschemas
     if "properties" in config_schema:

libs/cli/js-examples/README.md

@@ -10,7 +10,7 @@ This template demonstrates a simple chatbot implemented using [LangGraph.js](htt
 
 The core logic, defined in `src/agent/graph.ts`, showcases a straightforward chatbot that responds to user queries while maintaining context from previous messages.
 
-## What it does
+## 🤔 What is this?
 
 The simple chatbot:
 
@@ -20,6 +20,10 @@ The simple chatbot:
 
 This template provides a foundation that can be easily customized and extended to create more complex conversational agents.
 
+## 📖 Documentation
+
+For JavaScript and TypeScript documentation, see the [LangGraph.js docs](https://docs.langchain.com/oss/javascript/langgraph/overview). LangGraph Studio also integrates with [LangSmith](https://smith.langchain.com/) for tracing and collaboration with teammates.
+
 ## Getting Started
 
 Assuming you have already [installed LangGraph Studio](https://github.com/langchain-ai/langgraph-studio?tab=readme-ov-file#download), to set up:

libs/cli/js-examples/package.json

@@ -21,25 +21,28 @@
     "test:all": "yarn test && yarn test:int && yarn lint:langgraph"
   },
   "dependencies": {
-    "@langchain/core": "^1.1.31",
-    "@langchain/langgraph": "^1.2.1"
+    "@langchain/core": "^1.2.4",
+    "@langchain/langgraph": "^1.4.8"
+  },
+  "resolutions": {
+    "@langchain/langgraph-checkpoint": "1.0.4"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3.3.5",
+    "@eslint/eslintrc": "^3.3.6",
     "@eslint/js": "^10.0.1",
     "@tsconfig/recommended": "^1.0.13",
     "@types/jest": "^30.0.0",
-    "@typescript-eslint/eslint-plugin": "^8.56.1",
-    "@typescript-eslint/parser": "^8.56.1",
-    "dotenv": "^17.3.1",
-    "eslint": "^10.0.3",
+    "@typescript-eslint/eslint-plugin": "^8.65.0",
+    "@typescript-eslint/parser": "^8.65.0",
+    "dotenv": "^17.4.2",
+    "eslint": "^10.8.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.32.0",
     "eslint-plugin-no-instanceof": "^1.0.1",
-    "eslint-plugin-prettier": "^5.5.5",
-    "jest": "^30.2.0",
-    "prettier": "^3.8.1",
-    "ts-jest": "^29.4.6",
-    "typescript": "^5.9.3"
+    "eslint-plugin-prettier": "^5.5.6",
+    "jest": "^30.4.2",
+    "prettier": "^3.9.6",
+    "ts-jest": "^29.4.12",
+    "typescript": "^7.0.2"
   }
 }

libs/cli/js-monorepo-example/apps/agent/package.json

@@ -9,10 +9,10 @@
   },
   "dependencies": {
     "@js-monorepo-example/shared": "*",
-    "@langchain/core": "^1.1.31",
-    "@langchain/langgraph": "^1.2.1"
+    "@langchain/core": "^1.2.4",
+    "@langchain/langgraph": "^1.4.8"
   },
   "devDependencies": {
-    "typescript": "^5.9.3"
+    "typescript": "^7.0.2"
   }
 }

libs/cli/js-monorepo-example/libs/shared/package.json

@@ -9,6 +9,6 @@
     "clean": "rm -rf dist"
   },
   "devDependencies": {
-    "typescript": "^5.9.3"
+    "typescript": "^7.0.2"
   }
 }

libs/cli/js-monorepo-example/package.json

@@ -17,18 +17,18 @@
     "lint": "eslint 'apps/**/*.ts' 'libs/**/*.ts'"
   },
   "devDependencies": {
-    "turbo": "^2.8.14",
-    "typescript": "^5.9.3",
+    "turbo": "^2.10.8",
+    "typescript": "^7.0.2",
     "@tsconfig/recommended": "^1.0.13",
-    "@eslint/eslintrc": "^3.3.5",
+    "@eslint/eslintrc": "^3.3.6",
     "@eslint/js": "^10.0.1",
-    "eslint": "^10.0.3",
+    "eslint": "^10.8.0",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-import": "^2.27.5",
     "eslint-plugin-no-instanceof": "^1.0.1",
-    "eslint-plugin-prettier": "^5.5.5",
-    "@typescript-eslint/eslint-plugin": "^8.56.1",
-    "@typescript-eslint/parser": "^8.56.1",
-    "prettier": "^3.8.1"
+    "eslint-plugin-prettier": "^5.5.6",
+    "@typescript-eslint/eslint-plugin": "^8.65.0",
+    "@typescript-eslint/parser": "^8.65.0",
+    "prettier": "^3.9.6"
   }
 }

libs/cli/js-monorepo-example/tsconfig.json

@@ -3,7 +3,7 @@
   "compilerOptions": {
     "target": "ES2022",
     "module": "ESNext",
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "allowSyntheticDefaultImports": true,
     "esModuleInterop": true,
     "skipLibCheck": true,