update loop

merge
update
2026-08-27 01:52:25 +02:00 · 2026-04-14 05:51:25 -07:00 · 2026-04-13 08:17:42 -07:00 · 2026-04-10 14:23:21 -07:00 · 2026-04-09 17:35:59 -07:00
35 changed files with 685 additions and 2355 deletions
@@ -306,7 +306,7 @@ test = [

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@@ -6,11 +6,6 @@ Implementation of LangGraph CheckpointSaver that uses Postgres.

 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]`).

-## 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

 > [!IMPORTANT]
@@ -259,7 +259,7 @@ wheels = [

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+version = "4.0.1"
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 name = "zstandard"
 version = "0.25.0"
@@ -2,11 +2,6 @@

 Implementation of LangGraph CheckpointSaver that uses SQLite DB (both sync and async, via `aiosqlite`)

-## 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

 ```python
@@ -249,7 +249,7 @@ wheels = [

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-version = "1.2.28"
+version = "1.2.22"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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@@ -261,14 +261,14 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
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 name = "zstandard"
 version = "0.25.0"
@@ -26,9 +26,6 @@ You must pass these when invoking the graph as part of the configurable part of

 `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.

-> [!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

 When a graph node fails mid-execution at a given superstep, LangGraph stores pending checkpoint writes from any other nodes that completed successfully at that superstep, so that whenever we resume graph execution from that superstep we don't re-run the successful nodes.
@@ -1,10 +1,3 @@
-"""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
@@ -56,10 +56,6 @@ 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__(
@@ -74,11 +70,8 @@ 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 = (
@@ -537,8 +530,7 @@ def _create_msgpack_ext_hook(
            logger.warning(
                "Deserializing unregistered type %s.%s from checkpoint. "
                "This will be blocked in a future version. "
-                "Set LANGGRAPH_STRICT_MSGPACK=true to block now, or add "
-                "to allowed_msgpack_modules to allow explicitly: [(%r, %r)]",
+                "Add to allowed_msgpack_modules to silence: [(%r, %r)]",
                module,
                name,
                module,
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph-checkpoint"
-version = "4.0.2"
+version = "4.0.1"
 description = "Library with base interfaces for LangGraph checkpoint savers."
 authors = []
 requires-python = ">=3.10"
@@ -286,7 +286,7 @@ wheels = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.2"
+version = "4.0.1"
 source = { editable = "." }
 dependencies = [
    { name = "langchain-core" },
@@ -369,7 +369,7 @@ test = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.6.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -379,12 +379,11 @@ dependencies = [
    { name = "requests" },
    { name = "requests-toolbelt" },
    { name = "uuid-utils" },
-    { name = "xxhash" },
    { name = "zstandard" },
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 [[package]]
@@ -1118,7 +1117,7 @@ wheels = [

 [[package]]
 name = "pytest"
-version = "9.0.3"
+version = "9.0.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -1129,9 +1128,9 @@ dependencies = [
    { name = "pygments" },
    { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
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-]
-
 [[package]]
 name = "zstandard"
 version = "0.25.0"
@@ -1086,6 +1086,11 @@
  resolved "https://registry.yarnpkg.com/@types/stack-utils/-/stack-utils-2.0.3.tgz#6209321eb2c1712a7e7466422b8cb1fc0d9dd5d8"
  integrity sha512-9aEbYZ3TbYMznPdcdr3SmIrLXwC/AKZXQeCf9Pgao5CKb8CyHuEX5jzWPTkvregvhRJHcpRO6BFoGW9ycaOkYw==

+"@types/uuid@^10.0.0":
+  version "10.0.0"
+  resolved "https://registry.yarnpkg.com/@types/uuid/-/uuid-10.0.0.tgz#e9c07fe50da0f53dc24970cca94d619ff03f6f6d"
+  integrity sha512-7gqG38EyHgyP1S+7+xomFtL+ZNHcKv6DwNaCZmJmo1vgMugyF3TCnXVg4t1uk89mLNwnLtnY3TpOpCOyp1/xHQ==
+
 "@types/yargs-parser@*":
  version "21.0.3"
  resolved "https://registry.yarnpkg.com/@types/yargs-parser/-/yargs-parser-21.0.3.tgz#815e30b786d2e8f0dcd85fd5bcf5e1a04d008f15"
@@ -1777,6 +1782,13 @@ concat-map@0.0.1:
  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
  integrity sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==

+console-table-printer@^2.12.1:
+  version "2.15.0"
+  resolved "https://registry.yarnpkg.com/console-table-printer/-/console-table-printer-2.15.0.tgz#5c808204640b8f024d545bde8aabe5d344dfadc1"
+  integrity sha512-SrhBq4hYVjLCkBVOWaTzceJalvn5K1Zq5aQA6wXC/cYjI3frKWNPEMK3sZsJfNNQApvCQmgBcc13ZKmFj8qExw==
+  dependencies:
+    simple-wcswidth "^1.1.2"
+
 convert-source-map@^2.0.0:
  version "2.0.0"
  resolved "https://registry.yarnpkg.com/convert-source-map/-/convert-source-map-2.0.0.tgz#4b560f649fc4e918dd0ab75cf4961e8bc882d82a"
@@ -3676,12 +3688,16 @@ keyv@^4.5.4:
    json-buffer "3.0.1"

 "langsmith@>=0.5.0 <1.0.0":
-  version "0.5.20"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.20.tgz#4021847d2ccd5a86c5eb96060f9bb5f19f80eca5"
-  integrity sha512-ULhLM8RswvQDXufLtNtvclHrWCBx8Cb5UPI6lAZC+8Dq59iHsVPz/3Ac9khWNm1VIvChRsuykixD/WrmzuuA3Q==
+  version "0.5.4"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.4.tgz#f75b82b08e30db72a7d1d595b341e9666bd525e5"
+  integrity sha512-qYkNIoKpf0ZYt+cYzrDV+XI3FCexApmZmp8EMs3eDTMv0OvrHMLoxJ9IpkeoXJSX24+GPk0/jXjKx2hWerpy9w==
  dependencies:
-    p-queue "6.6.2"
-    uuid "10.0.0"
+    "@types/uuid" "^10.0.0"
+    chalk "^4.1.2"
+    console-table-printer "^2.12.1"
+    p-queue "^6.6.2"
+    semver "^7.6.3"
+    uuid "^10.0.0"

 leven@^3.1.0:
  version "3.1.0"
@@ -3991,7 +4007,7 @@ p-locate@^5.0.0:
  dependencies:
    p-limit "^3.0.2"

-p-queue@6.6.2, p-queue@^6.6.2:
+p-queue@^6.6.2:
  version "6.6.2"
  resolved "https://registry.yarnpkg.com/p-queue/-/p-queue-6.6.2.tgz#2068a9dcf8e67dd0ec3e7a2bcb76810faa85e426"
  integrity sha512-RwFpb72c/BhQLEXIZ5K2e+AhgNVmIejGlTgiB9MzZ0e93GRvqZ7uSi0dvRF7/XIXDeNkra2fNHBxTyPDGySpjQ==
@@ -4287,7 +4303,7 @@ semver@^6.3.1:
  resolved "https://registry.yarnpkg.com/semver/-/semver-6.3.1.tgz#556d2ef8689146e46dcea4bfdd095f3434dffcb4"
  integrity sha512-BR7VvDCVHO+q2xBEWskxS6DJE1qRnb7DxzUrogb71CWoSficBxYsiAGd+Kl0mmq/MprG9yArRkyrQxTO6XjMzA==

-semver@^7.5.3, semver@^7.5.4, semver@^7.7.2, semver@^7.7.3:
+semver@^7.5.3, semver@^7.5.4, semver@^7.6.3, semver@^7.7.2, semver@^7.7.3:
  version "7.7.4"
  resolved "https://registry.yarnpkg.com/semver/-/semver-7.7.4.tgz#28464e36060e991fa7a11d0279d2d3f3b57a7e8a"
  integrity sha512-vFKC2IEtQnVhpT78h1Yp8wzwrf8CM+MzKMHGJZfBtzhZNycRFnXsHk6E5TxIkkMsgNS7mdX3AGB7x2QM2di4lA==
@@ -4395,6 +4411,11 @@ signal-exit@^4.0.1:
  resolved "https://registry.yarnpkg.com/signal-exit/-/signal-exit-4.1.0.tgz#952188c1cbd546070e2dd20d0f41c0ae0530cb04"
  integrity sha512-bzyZ1e88w9O1iNJbKnOlvYTrWPDl46O1bG0D3XInv+9tkPrxrN8jUUTiFlDkkmKWgn1M6CfIA13SuGqOa9Korw==

+simple-wcswidth@^1.1.2:
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/simple-wcswidth/-/simple-wcswidth-1.1.2.tgz#66722f37629d5203f9b47c5477b1225b85d6525b"
+  integrity sha512-j7piyCjAeTDSjzTSQ7DokZtMNwNlEAyxqSZeCS+CXH7fJ4jx3FuJ/mTW3mE+6JLs4VJBbcll0Kjn+KXI5t21Iw==
+
 slash@^3.0.0:
  version "3.0.0"
  resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"
@@ -4849,7 +4870,7 @@ uri-js@^4.2.2:
  dependencies:
    punycode "^2.1.0"

-uuid@10.0.0, uuid@^10.0.0:
+uuid@^10.0.0:
  version "10.0.0"
  resolved "https://registry.yarnpkg.com/uuid/-/uuid-10.0.0.tgz#5a95aa454e6e002725c79055fd42aaba30ca6294"
  integrity sha512-8XkAphELsDnEGrDxUOHB3RGvXz6TeuYSGEZBOjtTtPm2lwhGBjLgOzLHB63IUWfBpNucQjND6d3AOudO+H3RWQ==
@@ -1328,9 +1328,9 @@ keyv@^4.5.4:
    json-buffer "3.0.1"

 "langsmith@>=0.5.0 <1.0.0":
-  version "0.5.20"
-  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.20.tgz#4021847d2ccd5a86c5eb96060f9bb5f19f80eca5"
-  integrity sha512-ULhLM8RswvQDXufLtNtvclHrWCBx8Cb5UPI6lAZC+8Dq59iHsVPz/3Ac9khWNm1VIvChRsuykixD/WrmzuuA3Q==
+  version "0.5.18"
+  resolved "https://registry.yarnpkg.com/langsmith/-/langsmith-0.5.18.tgz#c691ad23614f0b46eaf07d982e0ac988e1f43880"
+  integrity sha512-3zuZUWffTHQ+73EAwnodADtf534VNEZUpXr9jC12qyG8/IQuJET7PRsCpTb9wX2lmBspakwLUpqpj3tNm/0bVA==
  dependencies:
    p-queue "6.6.2"
    uuid "10.0.0"
@@ -1 +1 @@
-__version__ = "0.4.22"
+__version__ = "0.4.21"
@@ -26,15 +26,8 @@ class LogData(TypedDict):
    params: dict[str, Any]


-def get_anonymized_params(
-    kwargs: dict[str, Any], *, cli_command: str
-) -> dict[str, bool | str]:
-    params: dict[str, bool | str] = {}
-
-    if cli_command == "deploy" and (
-        analytics_source := os.getenv("LANGGRAPH_CLI_ANALYTICS_SOURCE")
-    ):
-        params["source"] = analytics_source
+def get_anonymized_params(kwargs: dict[str, Any]) -> dict[str, bool]:
+    params = {}

    # anonymize params with values
    if config := kwargs.get("config"):
@@ -95,7 +88,7 @@ def log_command(func):
            "python_version": platform.python_version(),
            "cli_version": __version__,
            "cli_command": func.__name__,
-            "params": get_anonymized_params(kwargs, cli_command=func.__name__),
+            "params": get_anonymized_params(kwargs),
        }

        background_thread = threading.Thread(target=log_data, args=(data,))
@@ -290,7 +290,7 @@ wheels = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.7.26"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -303,9 +303,9 @@ dependencies = [
    { name = "xxhash" },
    { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/76/86/6de4f6f0451a9658f26f633e0bb090552a4dafd7df3f1ae7f0d40558e67e/langsmith-0.7.26.tar.gz", hash = "sha256:a3e06f3d689ce7195717aa6b8f91082319819ec7ea9b9a62cdcd3d9dc25bfc7b", size = 1146118, upload-time = "2026-04-06T15:01:03.336Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
+    { url = "https://files.pythonhosted.org/packages/81/8e/7eb7d65ce62e98e74b9f18f193ea7ac3996d4fbd71fffcc67d0f7ba3103e/langsmith-0.7.26-py3-none-any.whl", hash = "sha256:fe5c877972cea450c1c48251c8fae0f18543c8d19dfdb9ff9a9c4263763dde4e", size = 360160, upload-time = "2026-04-06T15:01:01.516Z" },
 ]

 [[package]]
@@ -266,7 +266,7 @@ wheels = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.7.26"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -279,9 +279,9 @@ dependencies = [
    { name = "xxhash" },
    { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/76/86/6de4f6f0451a9658f26f633e0bb090552a4dafd7df3f1ae7f0d40558e67e/langsmith-0.7.26.tar.gz", hash = "sha256:a3e06f3d689ce7195717aa6b8f91082319819ec7ea9b9a62cdcd3d9dc25bfc7b", size = 1146118, upload-time = "2026-04-06T15:01:03.336Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
+    { url = "https://files.pythonhosted.org/packages/81/8e/7eb7d65ce62e98e74b9f18f193ea7ac3996d4fbd71fffcc67d0f7ba3103e/langsmith-0.7.26-py3-none-any.whl", hash = "sha256:fe5c877972cea450c1c48251c8fae0f18543c8d19dfdb9ff9a9c4263763dde4e", size = 360160, upload-time = "2026-04-06T15:01:01.516Z" },
 ]

 [[package]]
@@ -907,7 +907,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.2.28"
+version = "1.2.27"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch", marker = "python_full_version >= '3.11'" },
@@ -919,9 +919,9 @@ dependencies = [
    { name = "typing-extensions", marker = "python_full_version >= '3.11'" },
    { name = "uuid-utils", marker = "python_full_version >= '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/13/5c/56d19a252bbb26247b7a7cd20821d48804d7ca03212fec709cd8db7c2516/langchain_core-1.2.27.tar.gz", hash = "sha256:c18372e4c4c1454d49bf23a2e484431e71bd39b64173a0f621f0fc283d7183a4", size = 844935, upload-time = "2026-04-07T14:56:32.364Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
+    { url = "https://files.pythonhosted.org/packages/c1/c3/6e0865bc130c448270eb9511b47863a3f9145cdb519b19f6e4758fa63d6f/langchain_core-1.2.27-py3-none-any.whl", hash = "sha256:9ecd6b0393b969fe88f6b9b309367134080ab095946d79e6937dd3911aa42bd5", size = 508315, upload-time = "2026-04-07T14:56:30.93Z" },
 ]

 [[package]]
@@ -1120,7 +1120,7 @@ wheels = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.7.26"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx", marker = "python_full_version >= '3.11'" },
@@ -1133,9 +1133,9 @@ dependencies = [
    { name = "xxhash", marker = "python_full_version >= '3.11'" },
    { name = "zstandard", marker = "python_full_version >= '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/76/86/6de4f6f0451a9658f26f633e0bb090552a4dafd7df3f1ae7f0d40558e67e/langsmith-0.7.26.tar.gz", hash = "sha256:a3e06f3d689ce7195717aa6b8f91082319819ec7ea9b9a62cdcd3d9dc25bfc7b", size = 1146118, upload-time = "2026-04-06T15:01:03.336Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
+    { url = "https://files.pythonhosted.org/packages/81/8e/7eb7d65ce62e98e74b9f18f193ea7ac3996d4fbd71fffcc67d0f7ba3103e/langsmith-0.7.26-py3-none-any.whl", hash = "sha256:fe5c877972cea450c1c48251c8fae0f18543c8d19dfdb9ff9a9c4263763dde4e", size = 360160, upload-time = "2026-04-06T15:01:01.516Z" },
 ]

 [package.optional-dependencies]
@@ -1,7 +1,7 @@
 from __future__ import annotations

 from collections import ChainMap
-from collections.abc import Sequence
+from collections.abc import Mapping, Sequence
 from os import getenv
 from typing import Any, cast

@@ -217,16 +217,14 @@ def get_callback_manager_for_config(
            callbacks.add_tags(all_tags)
        if metadata := config.get("metadata"):
            callbacks.add_metadata(metadata)
-        manager = callbacks
+        return callbacks
    else:
        # otherwise create a new manager
-        manager = CallbackManager.configure(
+        return CallbackManager.configure(
            inheritable_callbacks=config.get("callbacks"),
            inheritable_tags=all_tags,
            inheritable_metadata=config.get("metadata"),
-            langsmith_inheritable_metadata=_get_tracing_metadata_defaults(config),
        )
-    return manager


 def get_async_callback_manager_for_config(
@@ -257,16 +255,14 @@ def get_async_callback_manager_for_config(
            callbacks.add_tags(all_tags)
        if metadata := config.get("metadata"):
            callbacks.add_metadata(metadata)
-        manager = callbacks
+        return callbacks
    else:
        # otherwise create a new manager
-        manager = AsyncCallbackManager.configure(
+        return AsyncCallbackManager.configure(
            inheritable_callbacks=config.get("callbacks"),
            inheritable_tags=all_tags,
            inheritable_metadata=config.get("metadata"),
-            langsmith_inheritable_metadata=_get_tracing_metadata_defaults(config),
        )
-    return manager


 def _is_not_empty(value: Any) -> bool:
@@ -312,54 +308,22 @@ def ensure_config(*configs: RunnableConfig | None) -> RunnableConfig:
        for k, v in config.items():
            if _is_not_empty(v) and k not in CONFIG_KEYS:
                empty[CONF][k] = v
-
-    configurable = empty.get("configurable")
-    metadata = empty.get("metadata")
-    if configurable and metadata is not None:
-        for key in _PROPAGATE_TO_METADATA:
-            if key in metadata:
-                continue
-            value = configurable.get(key)
-            if value:
-                metadata[key] = value
+    _empty_metadata = empty["metadata"]
+    for key, value in empty[CONF].items():
+        if _exclude_as_metadata(key, value, _empty_metadata):
+            continue
+        _empty_metadata[key] = value
    return empty


 _OMIT = ("key", "token", "secret", "password", "auth")


-def _exclude_as_metadata(key: str, value: Any) -> bool:
+def _exclude_as_metadata(key: str, value: Any, metadata: Mapping[str, Any]) -> bool:
    key_lower = key.casefold()
    return (
        key.startswith("__")
        or not isinstance(value, (str, int, float, bool))
+        or key in metadata
        or any(substr in key_lower for substr in _OMIT)
    )
-
-
-def _get_tracing_metadata_defaults(
-    config: RunnableConfig,
-) -> dict[str, Any] | None:
-    """Get tracer-only metadata defaults from configurable values."""
-    configurable = config.get("configurable")
-    if not configurable:
-        return None
-    metadata: dict[str, Any] = {}
-    for key, value in configurable.items():
-        if _exclude_as_metadata(key, value):
-            continue
-        metadata[key] = value
-    return metadata or None
-
-
-_PROPAGATE_TO_METADATA = frozenset(
-    (
-        "thread_id",
-        "checkpoint_id",
-        "checkpoint_ns",
-        "task_id",
-        "run_id",
-        "assistant_id",
-        "graph_id",
-    )
-)
@@ -0,0 +1,218 @@
+from __future__ import annotations
+
+import asyncio
+import os
+import queue
+import threading
+from collections.abc import Callable
+from contextlib import AbstractAsyncContextManager, AbstractContextManager
+from dataclasses import dataclass
+from types import TracebackType
+from typing import Any
+
+from langchain_core.runnables import RunnableConfig
+from langgraph.checkpoint.base import (
+    ChannelVersions,
+    Checkpoint,
+    CheckpointMetadata,
+)
+
+QUEUE_PUT_TIMEOUT = 0.05
+CHECKPOINT_BACKLOG_ENV_VAR = "LANGGRAPH_CHECKPOINT_BACKLOG"
+DEFAULT_CHECKPOINT_BACKLOG = 10
+
+
+def _resolve_checkpoint_backlog() -> int:
+    if raw := os.getenv(CHECKPOINT_BACKLOG_ENV_VAR):
+        try:
+            backlog = int(raw)
+        except ValueError:
+            return DEFAULT_CHECKPOINT_BACKLOG
+        if backlog > 0:
+            return backlog
+    return DEFAULT_CHECKPOINT_BACKLOG
+
+
+CHECKPOINT_BACKLOG = _resolve_checkpoint_backlog()
+
+
+@dataclass(frozen=True, slots=True)
+class CheckpointRequest:
+    config: RunnableConfig
+    checkpoint: Checkpoint
+    metadata: CheckpointMetadata
+    new_versions: ChannelVersions
+
+
+def _raise(error: BaseException) -> None:
+    raise error
+
+
+class SyncCheckpointWriter(AbstractContextManager):
+    __slots__ = ("put", "queue", "error", "closed", "thread")
+
+    def __init__(
+        self,
+        put: Callable[
+            [RunnableConfig, Checkpoint, CheckpointMetadata, ChannelVersions], Any
+        ],
+        *,
+        max_pending: int | None = None,
+    ) -> None:
+        self.put = put
+        max_pending = CHECKPOINT_BACKLOG if max_pending is None else max_pending
+        self.queue: queue.Queue[CheckpointRequest | None] = queue.Queue(max_pending)
+        self.error: BaseException | None = None
+        self.closed = False
+        self.thread = threading.Thread(
+            target=self._run,
+            name="langgraph-checkpoint-writer",
+            daemon=True,
+        )
+
+    def __enter__(self) -> SyncCheckpointWriter:
+        self.thread.start()
+        return self
+
+    def submit(self, request: CheckpointRequest) -> None:
+        self._ensure_open()
+        while True:
+            self._raise_if_broken()
+            try:
+                self.queue.put(request, timeout=QUEUE_PUT_TIMEOUT)
+            except queue.Full:
+                continue
+            else:
+                self._raise_if_broken()
+                return
+
+    def _run(self) -> None:
+        while True:
+            item = self.queue.get()
+            if item is None:
+                return
+            try:
+                self.put(
+                    item.config,
+                    item.checkpoint,
+                    item.metadata,
+                    item.new_versions,
+                )
+            except BaseException as exc:
+                self.error = exc
+                return
+
+    def _ensure_open(self) -> None:
+        if self.closed:
+            raise RuntimeError("Checkpoint writer is closed")
+
+    def _raise_if_broken(self) -> None:
+        if self.error is not None:
+            _raise(self.error)
+
+    def __exit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> bool | None:
+        self.closed = True
+        while self.thread.is_alive():
+            if self.error is not None:
+                break
+            try:
+                self.queue.put(None, timeout=QUEUE_PUT_TIMEOUT)
+            except queue.Full:
+                continue
+            else:
+                break
+        self.thread.join()
+        if exc_type is None and self.error is not None:
+            _raise(self.error)
+        return None
+
+
+class AsyncCheckpointWriter(AbstractAsyncContextManager):
+    __slots__ = ("put", "queue", "error", "closed", "task")
+
+    def __init__(
+        self,
+        put: Callable[
+            [RunnableConfig, Checkpoint, CheckpointMetadata, ChannelVersions], Any
+        ],
+        *,
+        max_pending: int | None = None,
+    ) -> None:
+        self.put = put
+        max_pending = CHECKPOINT_BACKLOG if max_pending is None else max_pending
+        self.queue: asyncio.Queue[CheckpointRequest | None] = asyncio.Queue(max_pending)
+        self.error: BaseException | None = None
+        self.closed = False
+        self.task: asyncio.Task[None] | None = None
+
+    async def __aenter__(self) -> AsyncCheckpointWriter:
+        self.task = asyncio.create_task(self._run(), name="langgraph-checkpoint-writer")
+        return self
+
+    async def submit(self, request: CheckpointRequest) -> None:
+        self._ensure_open()
+        while True:
+            self._raise_if_broken()
+            try:
+                await asyncio.wait_for(
+                    self.queue.put(request),
+                    timeout=QUEUE_PUT_TIMEOUT,
+                )
+            except asyncio.TimeoutError:
+                continue
+            else:
+                self._raise_if_broken()
+                return
+
+    async def _run(self) -> None:
+        while True:
+            item = await self.queue.get()
+            if item is None:
+                return
+            try:
+                await self.put(
+                    item.config,
+                    item.checkpoint,
+                    item.metadata,
+                    item.new_versions,
+                )
+            except BaseException as exc:
+                self.error = exc
+                return
+
+    def _ensure_open(self) -> None:
+        if self.closed:
+            raise RuntimeError("Checkpoint writer is closed")
+
+    def _raise_if_broken(self) -> None:
+        if self.error is not None:
+            _raise(self.error)
+
+    async def __aexit__(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> None:
+        self.closed = True
+        while self.task is not None and not self.task.done():
+            if self.error is not None:
+                break
+            try:
+                await asyncio.wait_for(
+                    self.queue.put(None),
+                    timeout=QUEUE_PUT_TIMEOUT,
+                )
+            except asyncio.TimeoutError:
+                continue
+            else:
+                break
+        if self.task is not None:
+            await self.task
+        if exc_type is None and self.error is not None:
+            _raise(self.error)
@@ -2,7 +2,6 @@ from __future__ import annotations

 import asyncio
 import binascii
-import concurrent.futures
 from collections import defaultdict, deque
 from collections.abc import Callable, Iterator, Mapping, Sequence
 from contextlib import (
@@ -27,7 +26,6 @@ from langgraph.cache.base import BaseCache
 from langgraph.checkpoint.base import (
    WRITES_IDX_MAP,
    BaseCheckpointSaver,
-    ChannelVersions,
    Checkpoint,
    CheckpointMetadata,
    CheckpointTuple,
@@ -97,6 +95,11 @@ from langgraph.pregel._checkpoint import (
    create_checkpoint,
    empty_checkpoint,
 )
+from langgraph.pregel._checkpoint_writer import (
+    AsyncCheckpointWriter,
+    CheckpointRequest,
+    SyncCheckpointWriter,
+)
 from langgraph.pregel._executor import (
    AsyncBackgroundExecutor,
    BackgroundExecutor,
@@ -172,19 +175,6 @@ class PregelLoop:
    checkpointer_get_next_version: GetNextVersion
    checkpointer_put_writes: Callable[[RunnableConfig, WritesT, str], Any] | None
    checkpointer_put_writes_accepts_task_path: bool
-    _checkpointer_put_after_previous: (
-        Callable[
-            [
-                concurrent.futures.Future | None,
-                RunnableConfig,
-                Checkpoint,
-                str,
-                ChannelVersions,
-            ],
-            Any,
-        ]
-        | None
-    )
    _migrate_checkpoint: Callable[[Checkpoint], None] | None
    submit: Submit
    channels: Mapping[str, BaseChannel]
@@ -536,7 +526,7 @@ class PregelLoop:
        )

        # produce debug output
-        if self._checkpointer_put_after_previous is not None:
+        if self.checkpointer is not None:
            self._emit(
                "checkpoints",
                map_debug_checkpoint,
@@ -582,7 +572,7 @@ class PregelLoop:

        return True

-    def after_tick(self) -> None:
+    def _after_tick(self) -> CheckpointRequest | None:
        # finish superstep
        writes = [w for t in self.tasks.values() for w in t.writes]
        # all tasks have finished
@@ -607,15 +597,7 @@ class PregelLoop:
        # only replay (re-execute) done tasks on the first tick
        self.is_replaying = False
        # save checkpoint
-        self._put_checkpoint({"source": "loop"})
-        # after execution, check if we should interrupt
-        if self.interrupt_after and should_interrupt(
-            self.checkpoint, self.interrupt_after, self.tasks.values()
-        ):
-            self.status = "interrupt_after"
-            raise GraphInterrupt()
-        # unset resuming flag
-        self.config[CONF].pop(CONFIG_KEY_RESUMING, None)
+        return self._prepare_checkpoint({"source": "loop"})

    def match_cached_writes(self) -> Sequence[PregelExecutableTask]:
        raise NotImplementedError
@@ -664,7 +646,7 @@ class PregelLoop:

    def _first(
        self, *, input_keys: str | Sequence[str], updated_channels: set[str] | None
-    ) -> set[str] | None:
+    ) -> tuple[set[str] | None, CheckpointRequest | None]:
        # Resuming from a previous checkpoint requires two things:
        # 1. A prior checkpoint exists (channel_versions is non-empty)
        # 2. The input signals continuation (not a fresh run with new input)
@@ -692,7 +674,7 @@ class PregelLoop:
        # writes so that interrupt() calls re-fire instead of returning
        # stale values. But if we're actively resuming, keep them —
        # multi-interrupt scenarios need previously resolved values preserved.
-        is_time_traveling = self.is_replaying and (
+        if self.is_replaying and (
            # Time-travel to a subgraph checkpoint: the parent sets
            # RESUMING=True (it can't distinguish time-travel from resume),
            # so we check if this subgraph's own ns is in checkpoint_map.
@@ -710,8 +692,7 @@ class PregelLoop:
                # (subgraph input is a Send arg, not a Command)
                or configurable.get(CONFIG_KEY_RESUMING, False)
            )
-        )
-        if is_time_traveling:
+        ):
            self.checkpoint_pending_writes = [
                w for w in self.checkpoint_pending_writes if w[1] != RESUME
            ]
@@ -759,6 +740,7 @@ class PregelLoop:
            )
            if updated_channels is not None:
                updated_channels.update(null_updated_channels)
+        checkpoint_request = None
        # proceed past previous checkpoint
        if is_resuming:
            self.checkpoint["versions_seen"].setdefault(INTERRUPT, {})
@@ -766,26 +748,6 @@ class PregelLoop:
                if k in self.checkpoint["channel_versions"]:
                    version = self.checkpoint["channel_versions"][k]
                    self.checkpoint["versions_seen"][INTERRUPT][k] = version
-            # When time-traveling (replaying from a specific checkpoint),
-            # save a fork checkpoint so the replayed execution creates a
-            # new branch. Without this, if the execution hits an interrupt
-            # before after_tick() runs, no new checkpoint is created —
-            # the parent's latest checkpoint remains the old one and
-            # subsequent resumes load the wrong state.
-            # Skip for update_state forks (source=update/fork) since they
-            # already have their own fork checkpoint.
-            if is_time_traveling and self.checkpoint_metadata.get("source") not in (
-                "update",
-                "fork",
-            ):
-                # Clear old INTERRUPT writes from the loaded checkpoint.
-                # The fork will have a new checkpoint_id which changes
-                # task IDs — stale interrupt writes would accumulate and
-                # confuse the multiple-interrupt check in future resumes.
-                self.checkpoint_pending_writes = [
-                    w for w in self.checkpoint_pending_writes if w[1] != INTERRUPT
-                ]
-                self._put_checkpoint({"source": "fork"})
            # produce values output
            self._emit(
                "values", map_output_values, self.output_keys, True, self.channels
@@ -821,25 +783,21 @@ class PregelLoop:
            )
            # save input checkpoint
            self.updated_channels = updated_channels
-            self._put_checkpoint({"source": "input"})
+            checkpoint_request = self._prepare_checkpoint({"source": "input"})
        elif CONFIG_KEY_RESUMING not in configurable:
            raise EmptyInputError(f"Received no input for {input_keys}")
        # Propagate resuming and replaying flags to subgraphs.
        if not self.is_nested:
            # Pass the resolved before-bound checkpoint ID so subgraphs can
            # find their corresponding checkpoint without re-fetching the
-            # parent. For forks (source=update/fork), use the fork's parent
+            # parent. For forks (source=update), use the fork's parent
            # checkpoint ID since the fork was created after the subgraph's
            # checkpoints from the original execution.
            replay_state: ReplayState | None = None
            if self.is_replaying:
                replay_checkpoint_id = self.checkpoint["id"]
                if (
-                    self.checkpoint_metadata.get("source")
-                    in (
-                        "update",
-                        "fork",
-                    )
+                    self.checkpoint_metadata.get("source") == "update"
                    and self.prev_checkpoint_config
                ):
                    replay_checkpoint_id = self.prev_checkpoint_config[CONF].get(
@@ -857,9 +815,11 @@ class PregelLoop:
        self.status = "pending"
        if is_resuming:
            self._push_graph_lifecycle_event("resume")
-        return updated_channels
+        return updated_channels, checkpoint_request

-    def _put_checkpoint(self, metadata: CheckpointMetadata) -> None:
+    def _prepare_checkpoint(
+        self, metadata: CheckpointMetadata
+    ) -> CheckpointRequest | None:
        # assign step and parents
        exiting = metadata is self.checkpoint_metadata
        if exiting and self.checkpoint["id"] == self.checkpoint_id_saved:
@@ -869,8 +829,7 @@ class PregelLoop:
            metadata["step"] = self.step
            metadata["parents"] = self.config[CONF].get(CONFIG_KEY_CHECKPOINT_MAP, {})
            self.checkpoint_metadata = metadata
-        # do checkpoint?
-        do_checkpoint = self._checkpointer_put_after_previous is not None and (
+        do_checkpoint = self.checkpointer is not None and (
            exiting or self.durability != "exit"
        )
        # create new checkpoint
@@ -892,9 +851,8 @@ class PregelLoop:
                for value in self.checkpoint["channel_values"][TASKS]
            ]
            self.checkpoint["channel_values"][TASKS] = sanitized_tasks
-        # bail if no checkpointer
-
-        if do_checkpoint and self._checkpointer_put_after_previous is not None:
+        request = None
+        if do_checkpoint:
            self.prev_checkpoint_config = (
                self.checkpoint_config
                if CONFIG_KEY_CHECKPOINT_ID in self.checkpoint_config[CONF]
@@ -916,17 +874,11 @@ class PregelLoop:
                self.checkpoint_previous_versions, channel_versions
            )
            self.checkpoint_previous_versions = channel_versions
-
-            # save it, without blocking
-            # if there's a previous checkpoint save in progress, wait for it
-            # ensuring checkpointers receive checkpoints in order
-            self._put_checkpoint_fut = self.submit(
-                self._checkpointer_put_after_previous,
-                getattr(self, "_put_checkpoint_fut", None),
-                self.checkpoint_config,
-                copy_checkpoint(self.checkpoint),
-                self.checkpoint_metadata,
-                new_versions,
+            request = CheckpointRequest(
+                config=self.checkpoint_config,
+                checkpoint=copy_checkpoint(self.checkpoint),
+                metadata=self.checkpoint_metadata,
+                new_versions=new_versions,
            )
            self.checkpoint_config = {
                **self.checkpoint_config,
@@ -938,24 +890,13 @@ class PregelLoop:
        if not exiting:
            # increment step
            self.step += 1
+        return request

-    def _suppress_interrupt(
+    def _finalize_suppress(
        self,
        exc_type: type[BaseException] | None,
        exc_value: BaseException | None,
-        traceback: TracebackType | None,
    ) -> bool | None:
-        # persist current checkpoint and writes
-        if self.durability == "exit" and (
-            # if it's a top graph
-            not self.is_nested
-            # or a nested graph with error or interrupt
-            or exc_value is not None
-            # or a nested graph with checkpointer=True
-            or all(NS_END not in part for part in self.checkpoint_ns)
-        ):
-            self._put_checkpoint(self.checkpoint_metadata)
-            self._put_pending_writes()
        # suppress interrupt
        if isinstance(exc_value, GraphInterrupt) and not self.is_nested:
            interrupt = exc_value
@@ -1000,6 +941,7 @@ class PregelLoop:
        elif exc_type is None:
            # save final output
            self.output = read_channels(self.channels, self.output_keys)
+        return None

    def _emit(
        self,
@@ -1147,26 +1089,57 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
            )
        else:
            self.checkpointer_get_next_version = increment
-            self._checkpointer_put_after_previous = None  # type: ignore[assignment]
            self.checkpointer_put_writes = None
            self.checkpointer_put_writes_accepts_task_path = False
+        self._checkpoint_writer: SyncCheckpointWriter | None = None

-    def _checkpointer_put_after_previous(
-        self,
-        prev: concurrent.futures.Future | None,
-        config: RunnableConfig,
-        checkpoint: Checkpoint,
-        metadata: CheckpointMetadata,
-        new_versions: ChannelVersions,
-    ) -> RunnableConfig:
-        try:
-            if prev is not None:
-                prev.result()
-        finally:
+    def _dispatch_checkpoint_request(self, request: CheckpointRequest) -> None:
+        if self.durability == "async" and self._checkpoint_writer is not None:
+            self._checkpoint_writer.submit(request)
+        else:
            cast(BaseCheckpointSaver, self.checkpointer).put(
-                config, checkpoint, metadata, new_versions
+                request.config,
+                request.checkpoint,
+                request.metadata,
+                request.new_versions,
            )

+    def _put_checkpoint(self, metadata: CheckpointMetadata) -> None:
+        if request := self._prepare_checkpoint(metadata):
+            self._dispatch_checkpoint_request(request)
+
+    def _suppress_interrupt(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> bool | None:
+        # persist current checkpoint and writes
+        if self.durability == "exit" and (
+            # if it's a top graph
+            not self.is_nested
+            # or a nested graph with error or interrupt
+            or exc_value is not None
+            # or a nested graph with checkpointer=True
+            or all(NS_END not in part for part in self.checkpoint_ns)
+        ):
+            self._put_checkpoint(self.checkpoint_metadata)
+            self._put_pending_writes()
+        return self._finalize_suppress(exc_type, exc_value)
+
+    def after_tick(self) -> None:
+        # compute tick state and save checkpoint
+        if request := self._after_tick():
+            self._dispatch_checkpoint_request(request)
+        # after execution, check if we should interrupt
+        if self.interrupt_after and should_interrupt(
+            self.checkpoint, self.interrupt_after, self.tasks.values()
+        ):
+            self.status = "interrupt_after"
+            raise GraphInterrupt()
+        # unset resuming flag
+        self.config[CONF].pop(CONFIG_KEY_RESUMING, None)
+
    def match_cached_writes(self) -> Sequence[PregelExecutableTask]:
        if self.cache is None:
            return ()
@@ -1262,6 +1235,10 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
            else []
        )
        self.submit = self.stack.enter_context(BackgroundExecutor(self.config))
+        if self.checkpointer is not None and self.durability == "async":
+            self._checkpoint_writer = self.stack.enter_context(
+                SyncCheckpointWriter(self.checkpointer.put)
+            )
        self.channels, self.managed = channels_from_checkpoint(
            self.specs, self.checkpoint
        )
@@ -1270,12 +1247,14 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
        self.step = self.checkpoint_metadata["step"] + 1
        self.stop = self.step + self.config["recursion_limit"] + 1
        self.checkpoint_previous_versions = self.checkpoint["channel_versions"].copy()
-        self.updated_channels = self._first(
+        self.updated_channels, checkpoint_request = self._first(
            input_keys=self.input_keys,
            updated_channels=set(self.checkpoint.get("updated_channels"))  # type: ignore[arg-type]
            if self.checkpoint.get("updated_channels")
            else None,
        )
+        if checkpoint_request is not None:
+            self._dispatch_checkpoint_request(checkpoint_request)

        return self

@@ -1346,26 +1325,34 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
            )
        else:
            self.checkpointer_get_next_version = increment
-            self._checkpointer_put_after_previous = None  # type: ignore[assignment]
            self.checkpointer_put_writes = None
            self.checkpointer_put_writes_accepts_task_path = False
+        self._checkpoint_writer: AsyncCheckpointWriter | None = None

-    async def _checkpointer_put_after_previous(
-        self,
-        prev: asyncio.Task | None,
-        config: RunnableConfig,
-        checkpoint: Checkpoint,
-        metadata: CheckpointMetadata,
-        new_versions: ChannelVersions,
-    ) -> RunnableConfig:
-        try:
-            if prev is not None:
-                await prev
-        finally:
+    async def _dispatch_checkpoint_request(self, request: CheckpointRequest) -> None:
+        if self.durability == "async" and self._checkpoint_writer is not None:
+            await self._checkpoint_writer.submit(request)
+        else:
            await cast(BaseCheckpointSaver, self.checkpointer).aput(
-                config, checkpoint, metadata, new_versions
+                request.config,
+                request.checkpoint,
+                request.metadata,
+                request.new_versions,
            )

+    async def aafter_tick(self) -> None:
+        # compute tick state and save checkpoint
+        if request := self._after_tick():
+            await self._dispatch_checkpoint_request(request)
+        # after execution, check if we should interrupt
+        if self.interrupt_after and should_interrupt(
+            self.checkpoint, self.interrupt_after, self.tasks.values()
+        ):
+            self.status = "interrupt_after"
+            raise GraphInterrupt()
+        # unset resuming flag
+        self.config[CONF].pop(CONFIG_KEY_RESUMING, None)
+
    async def amatch_cached_writes(self) -> Sequence[PregelExecutableTask]:
        if self.cache is None:
            return []
@@ -1410,6 +1397,32 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
            },
        )

+    async def _asuppress_interrupt(
+        self,
+        exc_type: type[BaseException] | None,
+        exc_value: BaseException | None,
+        traceback: TracebackType | None,
+    ) -> bool | None:
+        """Async counterpart of SyncPregelLoop._suppress_interrupt.
+
+        Uses async checkpoint dispatch so we don't block the event loop
+        (the sync version was previously used here via stack.push, which
+        would call the blocking checkpointer.put instead of aput).
+        """
+        # persist current checkpoint and writes
+        if self.durability == "exit" and (
+            # if it's a top graph
+            not self.is_nested
+            # or a nested graph with error or interrupt
+            or exc_value is not None
+            # or a nested graph with checkpointer=True
+            or all(NS_END not in part for part in self.checkpoint_ns)
+        ):
+            if request := self._prepare_checkpoint(self.checkpoint_metadata):
+                await self._dispatch_checkpoint_request(request)
+            self._put_pending_writes()
+        return self._finalize_suppress(exc_type, exc_value)
+
    # context manager

    async def __aenter__(self) -> Self:
@@ -1466,20 +1479,26 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
        self.submit = await self.stack.enter_async_context(
            AsyncBackgroundExecutor(self.config)
        )
+        if self.checkpointer is not None and self.durability == "async":
+            self._checkpoint_writer = await self.stack.enter_async_context(
+                AsyncCheckpointWriter(self.checkpointer.aput)
+            )
        self.channels, self.managed = channels_from_checkpoint(
            self.specs, self.checkpoint
        )
-        self.stack.push(self._suppress_interrupt)
+        self.stack.push_async_exit(self._asuppress_interrupt)
        self.status = "input"
        self.step = self.checkpoint_metadata["step"] + 1
        self.stop = self.step + self.config["recursion_limit"] + 1
        self.checkpoint_previous_versions = self.checkpoint["channel_versions"].copy()
-        self.updated_channels = self._first(
+        self.updated_channels, checkpoint_request = self._first(
            input_keys=self.input_keys,
            updated_channels=set(self.checkpoint.get("updated_channels"))  # type: ignore[arg-type]
            if self.checkpoint.get("updated_channels")
            else None,
        )
+        if checkpoint_request is not None:
+            await self._dispatch_checkpoint_request(checkpoint_request)

        return self

@@ -14,7 +14,7 @@ from langchain_core.messages import BaseMessage
 from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, LLMResult
 from pydantic import BaseModel

-from langgraph._internal._constants import NS_END, NS_SEP
+from langgraph._internal._constants import NS_SEP
 from langgraph.constants import TAG_HIDDEN, TAG_NOSTREAM
 from langgraph.pregel.protocol import StreamChunk
 from langgraph.types import Command
@@ -132,23 +132,15 @@ class StreamMessagesHandler(BaseCallbackHandler, _StreamingCallbackHandler):
        **kwargs: Any,
    ) -> Any:
        if metadata and (not tags or (TAG_NOSTREAM not in tags)):
-            task_checkpoint_ns = cast(str, metadata["langgraph_checkpoint_ns"])
-            checkpoint_ns = (
-                f"{task_checkpoint_ns.rsplit(NS_END, 1)[0]}{NS_END}"
-                if NS_END in task_checkpoint_ns
-                else task_checkpoint_ns
-            )
-            ns = tuple(task_checkpoint_ns.split(NS_SEP))[:-1]
+            ns = tuple(cast(str, metadata["langgraph_checkpoint_ns"]).split(NS_SEP))[
+                :-1
+            ]
            if not self.subgraphs and len(ns) > 0 and ns != self.parent_ns:
                return
-            stream_metadata = dict(metadata)
-            stream_metadata["langgraph_checkpoint_ns"] = checkpoint_ns
-            # Preserve backwards-compatible streamed checkpoint metadata shape.
-            stream_metadata["checkpoint_ns"] = checkpoint_ns
            if tags:
                if filtered_tags := [t for t in tags if not t.startswith("seq:step")]:
-                    stream_metadata["tags"] = filtered_tags
-            self.metadata[run_id] = (ns, stream_metadata)
+                    metadata["tags"] = filtered_tags
+            self.metadata[run_id] = (ns, metadata)

    def on_llm_new_token(
        self,
@@ -2775,9 +2775,6 @@ class Pregel(
                        )
                    loop.after_tick()
                    emit_graph_lifecycle_events(loop)
-                    # wait for checkpoint
-                    if durability_ == "sync":
-                        loop._put_checkpoint_fut.result()
            emit_graph_lifecycle_events(loop)
            # emit output
            yield from _output(
@@ -3196,11 +3193,8 @@ class Pregel(
                                _state_mapper,
                            ):
                                yield o
-                        loop.after_tick()
+                        await loop.aafter_tick()
                        await aemit_graph_lifecycle_events(loop)
-                        # wait for checkpoint
-                        if durability_ == "sync":
-                            await cast(asyncio.Future, loop._put_checkpoint_fut)
                finally:
                    # ensure waiter doesn't remain pending on cancel/shutdown
                    if _cleanup_waiter is not None:
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"

 [project]
 name = "langgraph"
-version = "1.1.7"
+version = "1.1.7a1"
 description = "Building stateful, multi-actor applications with LLMs"
 authors = []
 requires-python = ">=3.10"
@@ -24,7 +24,7 @@ classifiers = [
    'Programming Language :: Python :: 3.13',
 ]
 dependencies = [
-    "langchain-core>=1.3.0,<2",
+    "langchain-core>=0.1",
    "langgraph-checkpoint>=2.1.0,<5.0.0",
    "langgraph-sdk>=0.3.0,<0.4.0",
    "langgraph-prebuilt>=1.0.9,<1.1.0",
@@ -1396,6 +1396,7 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
                "langgraph_path": (PULL, "agent"),
                "langgraph_checkpoint_ns": AnyStr("agent:"),
                "checkpoint_ns": AnyStr("agent:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "fakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -1458,6 +1459,7 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
                "langgraph_path": (PULL, "agent"),
                "langgraph_checkpoint_ns": AnyStr("agent:"),
                "checkpoint_ns": AnyStr("agent:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "fakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -1510,6 +1512,7 @@ def test_prebuilt_tool_chat(snapshot: SnapshotAssertion) -> None:
                "langgraph_path": (PULL, "agent"),
                "langgraph_checkpoint_ns": AnyStr("agent:"),
                "checkpoint_ns": AnyStr("agent:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "fakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -6881,6 +6884,7 @@ def test_weather_subgraph(
                    "langgraph_path": ("__pregel_pull", "router_node"),
                    "langgraph_checkpoint_ns": AnyStr("router_node:"),
                    "checkpoint_ns": AnyStr("router_node:"),
+                    "_type": "fake-messages-list-chat-model",
                    "ls_provider": "fakemessageslistchatmodel",
                    "ls_model_type": "chat",
                    "ls_integration": "langchain_chat_model",
@@ -6908,6 +6912,7 @@ def test_weather_subgraph(
                    "langgraph_path": ("__pregel_pull", "model_node"),
                    "langgraph_checkpoint_ns": AnyStr("weather_graph:"),
                    "checkpoint_ns": AnyStr("weather_graph:"),
+                    "_type": "fake-messages-list-chat-model",
                    "ls_provider": "fakemessageslistchatmodel",
                    "ls_model_type": "chat",
                    "ls_integration": "langchain_chat_model",
@@ -6944,6 +6949,7 @@ def test_weather_subgraph(
                "langgraph_path": ("__pregel_pull", "router_node"),
                "langgraph_checkpoint_ns": AnyStr("router_node:"),
                "checkpoint_ns": AnyStr("router_node:"),
+                "_type": "fake-messages-list-chat-model",
                "ls_provider": "fakemessageslistchatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -1147,6 +1147,7 @@ async def test_prebuilt_tool_chat() -> None:
                "langgraph_path": (PULL, "agent"),
                "langgraph_checkpoint_ns": AnyStr("agent:"),
                "checkpoint_ns": AnyStr("agent:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "fakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -1209,6 +1210,7 @@ async def test_prebuilt_tool_chat() -> None:
                "langgraph_path": (PULL, "agent"),
                "langgraph_checkpoint_ns": AnyStr("agent:"),
                "checkpoint_ns": AnyStr("agent:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "fakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -1261,6 +1263,7 @@ async def test_prebuilt_tool_chat() -> None:
                "langgraph_path": (PULL, "agent"),
                "langgraph_checkpoint_ns": AnyStr("agent:"),
                "checkpoint_ns": AnyStr("agent:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "fakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -3978,6 +3981,7 @@ async def test_weather_subgraph(
                    "langgraph_path": ("__pregel_pull", "router_node"),
                    "langgraph_checkpoint_ns": AnyStr("router_node:"),
                    "checkpoint_ns": AnyStr("router_node:"),
+                    "_type": "fake-messages-list-chat-model",
                    "ls_provider": "fakemessageslistchatmodel",
                    "ls_model_type": "chat",
                    "ls_integration": "langchain_chat_model",
@@ -4005,6 +4009,7 @@ async def test_weather_subgraph(
                    "langgraph_path": ("__pregel_pull", "model_node"),
                    "langgraph_checkpoint_ns": AnyStr("weather_graph:"),
                    "checkpoint_ns": AnyStr("weather_graph:"),
+                    "_type": "fake-messages-list-chat-model",
                    "ls_provider": "fakemessageslistchatmodel",
                    "ls_model_type": "chat",
                    "ls_integration": "langchain_chat_model",
@@ -4041,6 +4046,7 @@ async def test_weather_subgraph(
                "langgraph_path": ("__pregel_pull", "router_node"),
                "langgraph_checkpoint_ns": AnyStr("router_node:"),
                "checkpoint_ns": AnyStr("router_node:"),
+                "_type": "fake-messages-list-chat-model",
                "ls_provider": "fakemessageslistchatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -54,6 +54,11 @@ from langgraph.pregel import (
    NodeBuilder,
    Pregel,
 )
+from langgraph.pregel._checkpoint_writer import (
+    CHECKPOINT_BACKLOG_ENV_VAR,
+    DEFAULT_CHECKPOINT_BACKLOG,
+    _resolve_checkpoint_backlog,
+)
 from langgraph.pregel._loop import SyncPregelLoop
 from langgraph.pregel._runner import PregelRunner
 from langgraph.types import (
@@ -615,11 +620,8 @@ def test_run_from_checkpoint_id_retains_previous_writes(
        )
    ]

-    # +2: one fork checkpoint from time travel, one from the new execution
-    assert len(new_history) == len(history) + 2
-    # new_history[0] is the new execution result, new_history[1] is the fork
-    assert new_history[1].metadata["source"] == "fork"
-    for original, new in zip(history, new_history[2:]):
+    assert len(new_history) == len(history) + 1
+    for original, new in zip(history, new_history[1:]):
        assert original.values == new.values
        assert original.next == new.next
        assert original.metadata["step"] == new.metadata["step"]
@@ -627,7 +629,7 @@ def test_run_from_checkpoint_id_retains_previous_writes(
    def _get_tasks(hist: list, start: int):
        return [h.tasks for h in hist[start:]]

-    assert _get_tasks(new_history, 2) == _get_tasks(history, 0)
+    assert _get_tasks(new_history, 1) == _get_tasks(history, 0)


 def test_batch_two_processes_in_out() -> None:
@@ -3729,6 +3731,7 @@ def test_repeat_condition(snapshot: SnapshotAssertion) -> None:
            "end": END,
        },
    )
+
    workflow.add_conditional_edges(
        "Chart Generator",
        router,
@@ -3752,6 +3755,90 @@ def test_repeat_condition(snapshot: SnapshotAssertion) -> None:
    assert app.get_graph().draw_mermaid(with_styles=False) == snapshot


+def test_sync_durability_applies_checkpoint_backpressure() -> None:
+    first_put_started = threading.Event()
+    release_first_put = threading.Event()
+    put_calls = 0
+    visited: list[int] = []
+    result: dict[str, Any] = {}
+    error: dict[str, BaseException] = {}
+
+    class SlowFirstPutCheckpointer(InMemorySaver):
+        def put(
+            self,
+            config: RunnableConfig,
+            checkpoint: Checkpoint,
+            metadata: CheckpointMetadata,
+            new_versions: Any,
+        ) -> RunnableConfig:
+            nonlocal put_calls
+            put_calls += 1
+            if put_calls == 1:
+                first_put_started.set()
+                release_first_put.wait()
+            return super().put(config, checkpoint, metadata, new_versions)
+
+    class State(TypedDict):
+        counter: int
+
+    def increment(state: State) -> State:
+        visited.append(state["counter"])
+        return {"counter": state["counter"] + 1}
+
+    def should_continue(state: State) -> str:
+        return "loop" if state["counter"] < 4 else "done"
+
+    builder = StateGraph(State)
+    builder.add_node("increment", increment)
+    builder.add_edge(START, "increment")
+    builder.add_conditional_edges(
+        "increment", should_continue, {"loop": "increment", "done": END}
+    )
+
+    graph = builder.compile(checkpointer=SlowFirstPutCheckpointer())
+
+    def invoke() -> None:
+        try:
+            result["value"] = graph.invoke(
+                {"counter": 0},
+                {"configurable": {"thread_id": "1"}},
+                durability="async",
+            )
+        except BaseException as exc:
+            error["value"] = exc
+
+    thread = threading.Thread(target=invoke)
+    thread.start()
+
+    assert first_put_started.wait(timeout=1)
+    time.sleep(0.05)
+
+    assert thread.is_alive()
+    assert len(visited) <= DEFAULT_CHECKPOINT_BACKLOG + 1
+
+    release_first_put.set()
+    thread.join(timeout=1)
+
+    assert not thread.is_alive()
+    assert "value" not in error
+    assert result["value"] == {"counter": 4}
+
+
+def test_checkpoint_backlog_uses_env_override(monkeypatch: pytest.MonkeyPatch) -> None:
+    monkeypatch.setenv(CHECKPOINT_BACKLOG_ENV_VAR, "7")
+    assert _resolve_checkpoint_backlog() == 7
+
+
+def test_checkpoint_backlog_invalid_env_uses_default(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    monkeypatch.setenv(CHECKPOINT_BACKLOG_ENV_VAR, "not-an-int")
+    assert _resolve_checkpoint_backlog() == DEFAULT_CHECKPOINT_BACKLOG
+
+    monkeypatch.setenv(CHECKPOINT_BACKLOG_ENV_VAR, "0")
+    assert _resolve_checkpoint_backlog() == DEFAULT_CHECKPOINT_BACKLOG
+
+
 def test_checkpoint_metadata(sync_checkpointer: BaseCheckpointSaver) -> None:
    """This test verifies that a run's configurable fields are merged with the
    previous checkpoint config for each step in the run.
@@ -6896,6 +6983,7 @@ def test_tags_stream_mode_messages() -> None:
                "langgraph_path": ("__pregel_pull", "call_model"),
                "langgraph_checkpoint_ns": AnyStr("call_model:"),
                "checkpoint_ns": AnyStr("call_model:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "genericfakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -6905,60 +6993,6 @@ def test_tags_stream_mode_messages() -> None:
    ]


-def test_configurable_propagates_to_stream_metadata() -> None:
-    """Regression: thread_id, run_id, assistant_id, graph_id,
-    and langgraph_auth_user_id from configurable must appear
-    in stream_mode='messages' metadata."""
-
-    def my_node(state):
-        return {"messages": HumanMessage(content="hello")}
-
-    graph = (
-        StateGraph(MessagesState)
-        .add_node("my_node", my_node)
-        .add_edge(START, "my_node")
-        .compile()
-    )
-
-    config = {
-        "configurable": {
-            "thread_id": "th-123",
-            "checkpoint_id": "ckpt-1",
-            "checkpoint_ns": "ns-1",
-            "task_id": "task-1",
-            "run_id": "run-456",
-            "assistant_id": "asst-789",
-            "graph_id": "graph-0",
-            "model": "gpt-4o",
-            "user_id": "uid-1",
-            "cron_id": "cron-1",
-            "langgraph_auth_user_id": "user-1",
-            # these should NOT be propagated into metadata
-            "some_api_key": "secret",
-            "custom_setting": {"nested": True},
-        },
-    }
-    results = list(graph.stream({"messages": []}, config, stream_mode="messages"))
-    assert len(results) == 1
-    _, metadata = results[0]
-    # propagated keys
-    assert metadata["thread_id"] == "th-123"
-    assert metadata["checkpoint_id"] == "ckpt-1"
-    assert metadata["checkpoint_ns"] == "ns-1"
-    assert metadata["task_id"] == "task-1"
-    assert metadata["run_id"] == "run-456"
-    assert metadata["assistant_id"] == "asst-789"
-    assert metadata["graph_id"] == "graph-0"
-    # These are only present in trace metadata by default as of langgraph 1.2
-    # assert metadata["model"] == "gpt-4o"
-    # assert metadata["user_id"] == "uid-1"
-    # assert metadata["cron_id"] == "cron-1"
-    # assert metadata["langgraph_auth_user_id"] == "user-1"
-    # non-allowlisted keys must not appear
-    assert "some_api_key" not in metadata
-    assert "custom_setting" not in metadata
-
-
 def test_stream_mode_messages_command() -> None:
    from langchain_core.messages import HumanMessage

@@ -20,7 +20,6 @@ from uuid import UUID

 import pytest
 from langchain_core.language_models import GenericFakeChatModel
-from langchain_core.messages import HumanMessage
 from langchain_core.runnables import RunnableConfig, RunnableLambda, RunnablePassthrough
 from langchain_core.utils.aiter import aclosing
 from langgraph.cache.base import BaseCache
@@ -54,6 +53,7 @@ from langgraph.func import entrypoint, task
 from langgraph.graph import END, START, StateGraph
 from langgraph.graph.message import MessagesState, add_messages
 from langgraph.pregel import NodeBuilder, Pregel
+from langgraph.pregel._checkpoint_writer import DEFAULT_CHECKPOINT_BACKLOG
 from langgraph.pregel._loop import AsyncPregelLoop
 from langgraph.pregel._runner import PregelRunner
 from langgraph.types import (
@@ -485,6 +485,61 @@ async def test_checkpoint_put_after_cancellation_stream_events_anext() -> None:
        assert False, "Task should be cancelled"


+async def test_async_durability_applies_checkpoint_backpressure() -> None:
+    first_put_started = asyncio.Event()
+    release_first_put = asyncio.Event()
+    put_calls = 0
+    visited: list[int] = []
+
+    class SlowFirstPutCheckpointer(InMemorySaver):
+        async def aput(
+            self,
+            config: RunnableConfig,
+            checkpoint: Checkpoint,
+            metadata: CheckpointMetadata,
+            new_versions: ChannelVersions,
+        ) -> RunnableConfig:
+            nonlocal put_calls
+            put_calls += 1
+            if put_calls == 1:
+                first_put_started.set()
+                await release_first_put.wait()
+            return await super().aput(config, checkpoint, metadata, new_versions)
+
+    class State(TypedDict):
+        counter: int
+
+    def increment(state: State) -> State:
+        visited.append(state["counter"])
+        return {"counter": state["counter"] + 1}
+
+    def should_continue(state: State) -> str:
+        return "loop" if state["counter"] < 4 else "done"
+
+    builder = StateGraph(State)
+    builder.add_node("increment", increment)
+    builder.add_edge(START, "increment")
+    builder.add_conditional_edges(
+        "increment", should_continue, {"loop": "increment", "done": END}
+    )
+
+    graph = builder.compile(checkpointer=SlowFirstPutCheckpointer())
+    task = asyncio.create_task(
+        graph.ainvoke(
+            {"counter": 0}, {"configurable": {"thread_id": "1"}}, durability="async"
+        )
+    )
+
+    await first_put_started.wait()
+    await asyncio.sleep(0.05)
+
+    assert not task.done()
+    assert len(visited) <= DEFAULT_CHECKPOINT_BACKLOG + 1
+
+    release_first_put.set()
+    assert await task == {"counter": 4}
+
+
 async def test_node_cancellation_on_external_cancel() -> None:
    inner_task_cancelled = False

@@ -2086,11 +2141,8 @@ async def test_run_from_checkpoint_id_retains_previous_writes(
        )
    ]

-    # +2: one fork checkpoint from time travel, one from the new execution
-    assert len(new_history) == len(history) + 2
-    # new_history[0] is the new execution result, new_history[1] is the fork
-    assert new_history[1].metadata["source"] == "fork"
-    for original, new in zip(history, new_history[2:]):
+    assert len(new_history) == len(history) + 1
+    for original, new in zip(history, new_history[1:]):
        assert original.values == new.values
        assert original.next == new.next
        assert original.metadata["step"] == new.metadata["step"]
@@ -2098,7 +2150,7 @@ async def test_run_from_checkpoint_id_retains_previous_writes(
    def _get_tasks(hist: list, start: int):
        return [h.tasks for h in hist[start:]]

-    assert _get_tasks(new_history, 2) == _get_tasks(history, 0)
+    assert _get_tasks(new_history, 1) == _get_tasks(history, 0)


 async def test_cond_edge_after_send() -> None:
@@ -7545,6 +7597,7 @@ async def test_tags_stream_mode_messages() -> None:
                "langgraph_path": ("__pregel_pull", "call_model"),
                "langgraph_checkpoint_ns": AnyStr("call_model:"),
                "checkpoint_ns": AnyStr("call_model:"),
+                "_type": "generic-fake-chat-model",
                "ls_provider": "genericfakechatmodel",
                "ls_model_type": "chat",
                "ls_integration": "langchain_chat_model",
@@ -7554,67 +7607,6 @@ async def test_tags_stream_mode_messages() -> None:
    ]


-async def test_configurable_propagates_to_stream_metadata() -> None:
-    """Regression: thread_id, run_id, assistant_id, graph_id,
-    and langgraph_auth_user_id from configurable must appear
-    in stream_mode='messages' metadata."""
-
-    def my_node(state):
-        return {"messages": HumanMessage(content="hello")}
-
-    graph = (
-        StateGraph(MessagesState)
-        .add_node("my_node", my_node)
-        .add_edge(START, "my_node")
-        .compile()
-    )
-
-    config = {
-        "configurable": {
-            "thread_id": "th-123",
-            "checkpoint_id": "ckpt-1",
-            "checkpoint_ns": "ns-1",
-            "task_id": "task-1",
-            "run_id": "run-456",
-            "assistant_id": "asst-789",
-            "graph_id": "graph-0",
-            "model": "gpt-4o",
-            "user_id": "uid-1",
-            "cron_id": "cron-1",
-            "langgraph_auth_user_id": "user-1",
-            # these should NOT be propagated into metadata
-            "some_api_key": "secret",
-            "custom_setting": {"nested": True},
-        },
-    }
-    results = [
-        chunk
-        async for chunk in graph.astream(
-            {"messages": []}, config, stream_mode="messages"
-        )
-    ]
-    assert len(results) == 1
-    _, metadata = results[0]
-    # propagated keys
-    assert metadata["thread_id"] == "th-123"
-    assert metadata["checkpoint_id"] == "ckpt-1"
-    assert metadata["checkpoint_ns"] == "ns-1"
-    assert metadata["task_id"] == "task-1"
-    assert metadata["run_id"] == "run-456"
-    assert metadata["assistant_id"] == "asst-789"
-    assert metadata["graph_id"] == "graph-0"
-
-    # These will only be traced as of langgraph 1.2 and not present by default in
-    # metadata
-    # assert metadata["model"] == "gpt-4o"
-    # assert metadata["user_id"] == "uid-1"
-    # assert metadata["cron_id"] == "cron-1"
-    # assert metadata["langgraph_auth_user_id"] == "user-1"
-    # non-allowlisted keys must not appear
-    assert "some_api_key" not in metadata
-    assert "custom_setting" not in metadata
-
-
 async def test_stream_mode_messages_command() -> None:
    from langchain_core.messages import HumanMessage

@@ -37,7 +37,6 @@ def _checkpoint_summary(history: list) -> list[dict]:
    Returns a list of dicts (newest-first, matching get_state_history order) with:
      - id: short checkpoint id suffix (last 6 chars)
      - parent_id: short parent checkpoint id suffix or None
-      - source: checkpoint metadata source (input, loop, fork, update)
      - next: tuple of next node names
      - values: channel values snapshot
    """
@@ -53,7 +52,6 @@ def _checkpoint_summary(history: list) -> list[dict]:
            {
                "id": cid[-6:],
                "parent_id": pid[-6:] if pid else None,
-                "source": s.metadata.get("source"),
                "next": s.next,
                "values": s.values,
            }
@@ -282,116 +280,6 @@ def test_replay_from_before_interrupt_refires(
    assert call_count["node_b"] == 1  # NOT re-executed (after interrupt)


-def test_replay_from_before_interrupt_then_resume(
-    sync_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Replay from checkpoint before interrupt node, then resume with a new
-    answer and verify the graph completes with the new value.
-
-    Graph: START --> node_a --> ask_human (interrupt) --> node_b --> END
-
-    Original run:
-      source=input  next=(__start__,)  values=[]
-      source=loop   next=(node_a,)     values=[]
-      source=loop   next=(ask_human,)  values=[a]            <-- replay from here
-      source=loop   next=(node_b,)     values=[a, human:old_answer]
-      source=loop   next=()            values=[a, human:old_answer, b]
-
-    After replay (fork created) + resume with "new_answer":
-      source=input  next=(__start__,)  values=[]
-      source=loop   next=(node_a,)     values=[]
-      source=loop   next=(ask_human,)  values=[a]            <-- branch point
-      source=loop   next=(node_b,)     values=[a, human:old_answer]
-      source=loop   next=()            values=[a, human:old_answer, b]  (old branch)
-      source=fork   next=(ask_human,)  values=[a]            <-- fork from branch point
-      source=loop   next=(node_b,)     values=[a, human:new_answer]
-      source=loop   next=()            values=[a, human:new_answer, b]  (new branch)
-    """
-
-    called: list[str] = []
-
-    def node_a(state: State) -> State:
-        called.append("node_a")
-        return {"value": ["a"]}
-
-    def ask_human(state: State) -> State:
-        called.append("ask_human")
-        answer = interrupt("What is your input?")
-        return {"value": [f"human:{answer}"]}
-
-    def node_b(state: State) -> State:
-        called.append("node_b")
-        return {"value": ["b"]}
-
-    graph = (
-        StateGraph(State)
-        .add_node("node_a", node_a)
-        .add_node("ask_human", ask_human)
-        .add_node("node_b", node_b)
-        .add_edge(START, "node_a")
-        .add_edge("node_a", "ask_human")
-        .add_edge("ask_human", "node_b")
-        .compile(checkpointer=sync_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # --- Original run: invoke until interrupt, then resume to complete ---
-    graph.invoke({"value": []}, config)
-    graph.invoke(Command(resume="old_answer"), config)
-
-    original_history = list(graph.get_state_history(config))
-    original = _checkpoint_summary(original_history)
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
-        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
-        ("loop", ("ask_human",), {"value": ["a"]}),
-        ("loop", ("node_a",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # --- Replay from checkpoint before ask_human ---
-    before_ask = next(s for s in original_history if s.next == ("ask_human",))
-
-    called.clear()
-    replay_result = graph.invoke(None, before_ask.config)
-    assert replay_result["__interrupt__"][0].value == "What is your input?"
-    assert "ask_human" in called
-    assert "node_a" not in called  # before the replay point, not re-executed
-
-    # A fork checkpoint is now the latest — it branches from the replay point
-    post_replay = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"]) for s in post_replay] == [
-        ("fork", ("ask_human",)),  # <-- new fork (latest)
-        ("loop", ()),  # original done
-        ("loop", ("node_b",)),
-        ("loop", ("ask_human",)),  # branch point
-        ("loop", ("node_a",)),
-        ("input", ("__start__",)),
-    ]
-
-    # --- Resume with a new answer ---
-    called.clear()
-    final_result = graph.invoke(Command(resume="new_answer"), config)
-    assert final_result["value"] == ["a", "human:new_answer", "b"]
-    assert "ask_human" in called
-    assert "node_b" in called
-
-    final = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch (from fork)
-        ("loop", (), {"value": ["a", "human:new_answer", "b"]}),
-        ("loop", ("node_b",), {"value": ["a", "human:new_answer"]}),
-        ("fork", ("ask_human",), {"value": ["a"]}),
-        # Original branch (preserved)
-        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
-        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
-        ("loop", ("ask_human",), {"value": ["a"]}),
-        ("loop", ("node_a",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
 def test_replay_interrupt_stable_across_replays(
    sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -432,14 +320,8 @@ def test_replay_interrupt_stable_across_replays(
        r = graph.invoke(None, before_ask.config)
        results.append(r)

-    # Each replay creates a fork with a unique interrupt ID, so we compare
-    # interrupt values and state values rather than full equality.
-    assert all("__interrupt__" in r for r in results)
-    assert all(
-        r["__interrupt__"][0].value == results[0]["__interrupt__"][0].value
-        for r in results
-    )
-    assert all(r["value"] == results[0]["value"] for r in results)
+    assert all(r == results[0] for r in results)
+    assert "__interrupt__" in results[0]


 def test_fork_from_before_interrupt_refires(
@@ -972,290 +854,6 @@ def test_subgraph_interrupt_replay_from_interrupt_checkpoint(
    assert "step_b" not in called


-def test_subgraph_interrupt_replay_from_parent_then_resume(
-    sync_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Replay from the parent checkpoint where a subgraph interrupt fired,
-    then resume with a new answer. Verifies that a fork is created and the
-    full graph completes. Checks full checkpoint history at each stage."""
-
-    called: list[str] = []
-
-    def router(state: State) -> State:
-        called.append("router")
-        return {"value": ["routed"]}
-
-    def step_a(state: State) -> State:
-        called.append("step_a")
-        return {"value": ["sub_a"]}
-
-    def ask_human(state: State) -> State:
-        called.append("ask_human")
-        answer = interrupt("Provide input:")
-        return {"value": [f"human:{answer}"]}
-
-    def step_b(state: State) -> State:
-        called.append("step_b")
-        return {"value": ["sub_b"]}
-
-    subgraph = (
-        StateGraph(State)
-        .add_node("step_a", step_a)
-        .add_node("ask_human", ask_human)
-        .add_node("step_b", step_b)
-        .add_edge(START, "step_a")
-        .add_edge("step_a", "ask_human")
-        .add_edge("ask_human", "step_b")
-        .compile(checkpointer=True)
-    )
-
-    def post_process(state: State) -> State:
-        called.append("post_process")
-        return {"value": ["post"]}
-
-    graph = (
-        StateGraph(State)
-        .add_node("router", router)
-        .add_node("subgraph_node", subgraph)
-        .add_node("post_process", post_process)
-        .add_edge(START, "router")
-        .add_edge("router", "subgraph_node")
-        .add_edge("subgraph_node", "post_process")
-        .compile(checkpointer=sync_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # Run until interrupt, then resume to complete
-    graph.invoke({"value": []}, config)
-    graph.invoke(Command(resume="old_answer"), config)
-
-    # Original parent history (newest first)
-    original_history = list(graph.get_state_history(config))
-    assert [s.next for s in original_history] == [
-        (),  # done
-        ("post_process",),
-        ("subgraph_node",),  # subgraph ran, interrupt fired here
-        ("router",),
-        ("__start__",),
-    ]
-
-    # Find the parent checkpoint where the interrupt fired
-    interrupt_checkpoint = next(
-        s for s in original_history if s.next == ("subgraph_node",)
-    )
-
-    # Replay from parent checkpoint — subgraph re-executes, interrupt re-fires
-    called.clear()
-    replay_result = graph.invoke(None, interrupt_checkpoint.config)
-    assert "__interrupt__" in replay_result
-    assert replay_result["__interrupt__"][0].value == "Provide input:"
-    assert "step_a" in called
-    assert "ask_human" in called
-    assert "step_b" not in called
-
-    # Verify fork checkpoint was created
-    post_replay_history = list(graph.get_state_history(config))
-    assert [s.next for s in post_replay_history] == [
-        ("subgraph_node",),  # fork (interrupt pending)
-        (),  # original done
-        ("post_process",),
-        ("subgraph_node",),
-        ("router",),
-        ("__start__",),
-    ]
-    assert [s.metadata["source"] for s in post_replay_history] == [
-        "fork",
-        "loop",
-        "loop",
-        "loop",
-        "loop",
-        "input",
-    ]
-    fork = post_replay_history[0]
-    assert (
-        fork.parent_config["configurable"]["checkpoint_id"]
-        == interrupt_checkpoint.config["configurable"]["checkpoint_id"]
-    )
-
-    # Resume with a new answer — full graph should complete
-    called.clear()
-    final_result = graph.invoke(Command(resume="new_answer"), config)
-    assert "__interrupt__" not in final_result
-    assert "human:new_answer" in final_result["value"]
-    assert "sub_b" in final_result["value"]
-    assert "post" in final_result["value"]
-    assert "ask_human" in called
-    assert "step_b" in called
-    assert "post_process" in called
-
-    # Final checkpoint history
-    final_history = list(graph.get_state_history(config))
-    assert [s.next for s in final_history] == [
-        (),  # new branch done
-        ("post_process",),  # new branch post_process
-        ("subgraph_node",),  # fork
-        (),  # original done
-        ("post_process",),
-        ("subgraph_node",),
-        ("router",),
-        ("__start__",),
-    ]
-    assert [s.metadata["source"] for s in final_history] == [
-        "loop",
-        "loop",
-        "fork",
-        "loop",
-        "loop",
-        "loop",
-        "loop",
-        "input",
-    ]
-
-
-def test_subgraph_replay_loads_accumulated_state_then_resume(
-    sync_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Two parent invocations, then replay from before the subgraph in the
-    2nd invocation. The subgraph (checkpointer=True) should load its
-    accumulated state from the 1st invocation via ReplayState, re-fire
-    the interrupt, and then resume + complete.
-
-    This tests the ReplayState path: the parent is replaying and the
-    subgraph uses list(before=parent_checkpoint_id) to find its
-    corresponding checkpoint from the original execution.
-    """
-
-    class SubState(TypedDict):
-        value: Annotated[list[str], operator.add]
-
-    class ParentState(TypedDict):
-        results: Annotated[list[str], operator.add]
-
-    started_state: list[dict] = []
-
-    def step_a(state: SubState) -> SubState:
-        started_state.append(dict(state))
-        answer = interrupt("question_a")
-        return {"value": [f"a:{answer}"]}
-
-    subgraph = (
-        StateGraph(SubState)
-        .add_node("step_a", step_a)
-        .add_edge(START, "step_a")
-        .compile(checkpointer=True)
-    )
-
-    def parent_node(state: ParentState) -> ParentState:
-        return {"results": ["p"]}
-
-    graph = (
-        StateGraph(ParentState)
-        .add_node("parent_node", parent_node)
-        .add_node("sub_node", subgraph)
-        .add_edge(START, "parent_node")
-        .add_edge("parent_node", "sub_node")
-        .compile(checkpointer=sync_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # === 1st invocation: complete with answer "a1" ===
-    graph.invoke({"results": []}, config)
-    graph.invoke(Command(resume="a1"), config)
-
-    # step_a saw empty state (fresh subgraph)
-    assert started_state[0] == {"value": []}
-
-    # === 2nd invocation: complete with answer "a2" ===
-    started_state.clear()
-    graph.invoke({"results": []}, config)
-    graph.invoke(Command(resume="a2"), config)
-
-    # Stateful subgraph retained state from 1st invocation
-    assert started_state[0] == {"value": ["a:a1"]}
-
-    # Original history (newest first)
-    original_history = list(graph.get_state_history(config))
-    assert [s.next for s in original_history] == [
-        (),  # 2nd done
-        ("sub_node",),  # 2nd sub_node
-        ("parent_node",),  # 2nd parent_node
-        ("__start__",),  # 2nd input
-        (),  # 1st done
-        ("sub_node",),  # 1st sub_node
-        ("parent_node",),  # 1st parent_node
-        ("__start__",),  # 1st input
-    ]
-
-    # Replay from before sub_node in 2nd invocation (newest match)
-    before_sub_2nd = [s for s in original_history if s.next == ("sub_node",)][0]
-    started_state.clear()
-    replay = graph.invoke(None, before_sub_2nd.config)
-    assert "__interrupt__" in replay
-
-    # Subgraph should see accumulated state from END of 1st invocation
-    assert started_state[0] == {"value": ["a:a1"]}
-
-    # Verify fork was created
-    post_replay_history = list(graph.get_state_history(config))
-    assert [s.next for s in post_replay_history] == [
-        ("sub_node",),  # fork (interrupt pending)
-        (),  # 2nd done
-        ("sub_node",),  # 2nd sub_node
-        ("parent_node",),  # 2nd parent_node
-        ("__start__",),  # 2nd input
-        (),  # 1st done
-        ("sub_node",),  # 1st sub_node
-        ("parent_node",),  # 1st parent_node
-        ("__start__",),  # 1st input
-    ]
-    assert [s.metadata["source"] for s in post_replay_history] == [
-        "fork",
-        "loop",
-        "loop",
-        "loop",
-        "input",
-        "loop",
-        "loop",
-        "loop",
-        "input",
-    ]
-
-    # Resume with a new answer
-    started_state.clear()
-    final = graph.invoke(Command(resume="a3"), config)
-    assert "__interrupt__" not in final
-    assert final["results"] == ["p", "p"]
-
-    # Final history
-    final_history = list(graph.get_state_history(config))
-    assert [s.next for s in final_history] == [
-        (),  # new branch done
-        ("sub_node",),  # fork
-        (),  # 2nd done
-        ("sub_node",),  # 2nd sub_node
-        ("parent_node",),  # 2nd parent_node
-        ("__start__",),  # 2nd input
-        (),  # 1st done
-        ("sub_node",),  # 1st sub_node
-        ("parent_node",),  # 1st parent_node
-        ("__start__",),  # 1st input
-    ]
-    assert [s.metadata["source"] for s in final_history] == [
-        "loop",
-        "fork",
-        "loop",
-        "loop",
-        "loop",
-        "input",
-        "loop",
-        "loop",
-        "loop",
-        "input",
-    ]
-
-
 def test_subgraph_interrupt_full_flow(
    sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -1692,321 +1290,6 @@ def test_subgraph_time_travel_to_second_interrupt(
    assert "ask_1" not in called


-def test_subgraph_time_travel_resume_from_first_interrupt(
-    sync_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Time travel to a subgraph checkpoint at the first interrupt, then
-    resume through both interrupts with new answers.
-
-    This verifies the key bug fix: after time-traveling to a subgraph
-    checkpoint with an interrupt, a fork checkpoint is created so that
-    subsequent resumes find the correct state (not the old branch tip).
-
-    Parent:    START --> executor (subgraph, checkpointer=True) --> END
-    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
-
-    Parent history after original run completes:
-      source=input  next=(__start__,)   values=[]
-      source=loop   next=(executor,)    values=[]
-      source=loop   next=()             values=[step_a_done, ask_1:answer_1, ask_2:answer_2]
-
-    After time-traveling to 1st interrupt + resuming with new answers:
-      source=input  next=(__start__,)   values=[]
-      source=loop   next=(executor,)    values=[]          <-- branch point
-      source=loop   next=()             values=[..., ask_2:answer_2]  (old branch)
-      source=fork   next=(executor,)    values=[]          <-- fork from time travel
-      source=loop   next=()             values=[..., ask_2:new_answer_2]  (new branch)
-    """
-
-    called: list[str] = []
-
-    def step_a(state: State) -> State:
-        called.append("step_a")
-        return {"value": ["step_a_done"]}
-
-    def ask_1(state: State) -> State:
-        called.append("ask_1")
-        answer = interrupt("Question 1?")
-        return {"value": [f"ask_1:{answer}"]}
-
-    def ask_2(state: State) -> State:
-        called.append("ask_2")
-        answer = interrupt("Question 2?")
-        return {"value": [f"ask_2:{answer}"]}
-
-    executor = (
-        StateGraph(State)
-        .add_node("step_a", step_a)
-        .add_node("ask_1", ask_1)
-        .add_node("ask_2", ask_2)
-        .add_edge(START, "step_a")
-        .add_edge("step_a", "ask_1")
-        .add_edge("ask_1", "ask_2")
-        .add_edge("ask_2", "__end__")
-        .compile(checkpointer=True)
-    )
-
-    graph = (
-        StateGraph(State)
-        .add_node("executor", executor)
-        .add_edge(START, "executor")
-        .compile(checkpointer=sync_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # --- Original run: hit both interrupts and resume ---
-    graph.invoke({"value": []}, config)
-    sub_config_at_first = graph.get_state(config, subgraphs=True).tasks[0].state.config
-    graph.invoke(Command(resume="answer_1"), config)
-    graph.invoke(Command(resume="answer_2"), config)
-
-    original = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # --- Time travel to first interrupt's subgraph checkpoint ---
-    called.clear()
-    replay_result = graph.invoke(None, sub_config_at_first)
-    assert replay_result["__interrupt__"][0].value == "Question 1?"
-    assert "step_a" not in called  # before interrupt, not re-executed
-
-    # Fork is now the latest parent checkpoint
-    post_tt = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"]) for s in post_tt] == [
-        ("fork", ("executor",)),  # <-- new fork (latest)
-        ("loop", ()),  # original done
-        ("loop", ("executor",)),
-        ("input", ("__start__",)),
-    ]
-
-    # --- Resume both interrupts with new answers ---
-    called.clear()
-    resume_1 = graph.invoke(Command(resume="new_answer_1"), config)
-    assert resume_1["__interrupt__"][0].value == "Question 2?"
-    assert "ask_1" in called
-
-    called.clear()
-    resume_2 = graph.invoke(Command(resume="new_answer_2"), config)
-    assert resume_2["value"] == [
-        "step_a_done",
-        "ask_1:new_answer_1",
-        "ask_2:new_answer_2",
-    ]
-
-    # Verify final history: original branch preserved, new branch appended
-    final = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch (from time travel fork)
-        (
-            "loop",
-            (),
-            {"value": ["step_a_done", "ask_1:new_answer_1", "ask_2:new_answer_2"]},
-        ),
-        ("fork", ("executor",), {"value": []}),
-        # Original branch (preserved)
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
-def test_subgraph_time_travel_resume_from_second_interrupt(
-    sync_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Time travel to a subgraph checkpoint at the second interrupt, then
-    resume with a new answer. The first interrupt's answer should be preserved.
-
-    Parent:    START --> executor (subgraph, checkpointer=True) --> END
-    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
-
-    Key assertion: after resuming from a time-travel to the 2nd interrupt,
-    the final state keeps ask_1's original answer but uses the new ask_2 answer.
-    """
-
-    called: list[str] = []
-
-    def step_a(state: State) -> State:
-        called.append("step_a")
-        return {"value": ["step_a_done"]}
-
-    def ask_1(state: State) -> State:
-        called.append("ask_1")
-        answer = interrupt("Question 1?")
-        return {"value": [f"ask_1:{answer}"]}
-
-    def ask_2(state: State) -> State:
-        called.append("ask_2")
-        answer = interrupt("Question 2?")
-        return {"value": [f"ask_2:{answer}"]}
-
-    executor = (
-        StateGraph(State)
-        .add_node("step_a", step_a)
-        .add_node("ask_1", ask_1)
-        .add_node("ask_2", ask_2)
-        .add_edge(START, "step_a")
-        .add_edge("step_a", "ask_1")
-        .add_edge("ask_1", "ask_2")
-        .add_edge("ask_2", "__end__")
-        .compile(checkpointer=True)
-    )
-
-    graph = (
-        StateGraph(State)
-        .add_node("executor", executor)
-        .add_edge(START, "executor")
-        .compile(checkpointer=sync_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # --- Original run: hit both interrupts and resume ---
-    graph.invoke({"value": []}, config)
-    graph.invoke(Command(resume="answer_1"), config)
-    sub_config_at_second = graph.get_state(config, subgraphs=True).tasks[0].state.config
-    graph.invoke(Command(resume="answer_2"), config)
-
-    original = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # --- Time travel to second interrupt ---
-    called.clear()
-    replay_result = graph.invoke(None, sub_config_at_second)
-    assert replay_result["__interrupt__"][0].value == "Question 2?"
-    assert "step_a" not in called
-    assert "ask_1" not in called  # already resolved, not re-executed
-
-    # Fork is now the latest parent checkpoint
-    post_tt = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"]) for s in post_tt] == [
-        ("fork", ("executor",)),  # <-- new fork (latest)
-        ("loop", ()),  # original done
-        ("loop", ("executor",)),
-        ("input", ("__start__",)),
-    ]
-
-    # --- Resume with a new answer for ask_2 only ---
-    called.clear()
-    resume_result = graph.invoke(Command(resume="new_answer_2"), config)
-    # ask_1's original answer preserved, ask_2 uses the new answer
-    assert resume_result["value"] == [
-        "step_a_done",
-        "ask_1:answer_1",
-        "ask_2:new_answer_2",
-    ]
-
-    # Verify final history: original branch preserved, new branch appended
-    final = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch (from time travel fork)
-        (
-            "loop",
-            (),
-            {"value": ["step_a_done", "ask_1:answer_1", "ask_2:new_answer_2"]},
-        ),
-        ("fork", ("executor",), {"value": []}),
-        # Original branch (preserved)
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
-def test_subgraph_time_travel_checkpoint_pattern(
-    sync_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Verify the checkpoint pattern created by time travel to a subgraph
-    interrupt. A fork checkpoint should branch from the replay point and
-    become the latest parent checkpoint.
-
-    Parent:    START --> executor (subgraph, checkpointer=True) --> END
-    Executor:  START --> ask (interrupt) --> END
-
-    Original run (after completing):
-      source=input  next=(__start__,)  values=[]
-      source=loop   next=(executor,)   values=[]          <-- replay point
-      source=loop   next=()            values=[a:first]
-
-    After time travel to interrupt + resume with "second":
-      source=input  next=(__start__,)  values=[]
-      source=loop   next=(executor,)   values=[]          <-- branch point
-      source=loop   next=()            values=[a:first]   (old branch)
-      source=fork   next=(executor,)   values=[]          <-- fork
-      source=loop   next=()            values=[a:second]  (new branch)
-    """
-
-    def ask(state: State) -> State:
-        answer = interrupt("Q?")
-        return {"value": [f"a:{answer}"]}
-
-    executor = (
-        StateGraph(State)
-        .add_node("ask", ask)
-        .add_edge(START, "ask")
-        .compile(checkpointer=True)
-    )
-
-    graph = (
-        StateGraph(State)
-        .add_node("executor", executor)
-        .add_edge(START, "executor")
-        .compile(checkpointer=sync_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # Run until interrupt, then complete
-    graph.invoke({"value": []}, config)
-    sub_config = graph.get_state(config, subgraphs=True).tasks[0].state.config
-    graph.invoke(Command(resume="first"), config)
-
-    original = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["a:first"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # Time travel to the interrupt
-    graph.invoke(None, sub_config)
-
-    # Fork is now the latest, branching from the original replay point
-    post_tt = list(graph.get_state_history(config))
-    post_tt_summary = _checkpoint_summary(post_tt)
-    assert [(s["source"], s["next"]) for s in post_tt_summary] == [
-        ("fork", ("executor",)),  # <-- new fork (latest)
-        ("loop", ()),
-        ("loop", ("executor",)),  # <-- replay point / fork parent
-        ("input", ("__start__",)),
-    ]
-    # Verify the fork's parent is the original replay point
-    replay_point_id = sub_config["configurable"]["checkpoint_map"][""]
-    assert post_tt[0].parent_config["configurable"]["checkpoint_id"] == replay_point_id
-
-    # Resume from the fork — graph completes with new answer
-    result = graph.invoke(Command(resume="second"), config)
-    assert result["value"] == ["a:second"]
-
-    final = _checkpoint_summary(list(graph.get_state_history(config)))
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch
-        ("loop", (), {"value": ["a:second"]}),
-        ("fork", ("executor",), {"value": []}),
-        # Original branch
-        ("loop", (), {"value": ["a:first"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
 def test_subgraph_time_travel_after_completion(
    sync_checkpointer: BaseCheckpointSaver,
 ) -> None:
@@ -3000,16 +2283,14 @@ def test_replay_creates_branch_preserving_old_checkpoints(
    # -- Post-replay checkpoint history (newest first) --
    post_replay_history = list(graph.get_state_history(config))
    post_summary = _checkpoint_summary(post_replay_history)
-    # 5 original + 1 fork + 2 new branch checkpoints = 8
-    assert len(post_summary) == 8
+    assert len(post_summary) == 7  # 5 original + 2 new branch checkpoints

    # Verify the full shape after replay
    assert [s["next"] for s in post_summary] == [
-        (),  # new branch tip
-        ("node_c",),  # new branch
-        ("node_b",),  # fork from replay point
-        (),  # old branch tip
-        ("node_c",),  # old
+        (),  # new branch tip (C6)
+        ("node_c",),  # new branch (C5)
+        (),  # old branch tip (C4)
+        ("node_c",),  # old (C3)
        ("node_b",),  # branch point (C2)
        ("node_a",),  # old (C1)
        ("__start__",),  # old (C0)
@@ -3017,7 +2298,6 @@ def test_replay_creates_branch_preserving_old_checkpoints(
    assert [s["values"] for s in post_summary] == [
        {"value": ["a", "b2", "c"]},  # new branch tip
        {"value": ["a", "b2"]},  # new: node_b re-ran with call_count=2
-        {"value": ["a"]},  # fork from replay point
        {"value": ["a", "b1", "c"]},  # old branch tip preserved
        {"value": ["a", "b1"]},  # old
        {"value": ["a"]},  # branch point
@@ -46,7 +46,6 @@ def _checkpoint_summary(history: list) -> list[dict]:
    Returns a list of dicts (newest-first, matching get_state_history order) with:
      - id: short checkpoint id suffix (last 6 chars)
      - parent_id: short parent checkpoint id suffix or None
-      - source: checkpoint metadata source (input, loop, fork, update)
      - next: tuple of next node names
      - values: channel values snapshot
    """
@@ -62,7 +61,6 @@ def _checkpoint_summary(history: list) -> list[dict]:
            {
                "id": cid[-6:],
                "parent_id": pid[-6:] if pid else None,
-                "source": s.metadata.get("source"),
                "next": s.next,
                "values": s.values,
            }
@@ -337,14 +335,8 @@ async def test_replay_interrupt_stable_across_replays(
        r = await graph.ainvoke(None, before_ask.config)
        results.append(r)

-    # Each replay creates a fork with a unique interrupt ID, so we compare
-    # interrupt values and state values rather than full equality.
-    assert all("__interrupt__" in r for r in results)
-    assert all(
-        r["__interrupt__"][0].value == results[0]["__interrupt__"][0].value
-        for r in results
-    )
-    assert all(r["value"] == results[0]["value"] for r in results)
+    assert all(r == results[0] for r in results)
+    assert "__interrupt__" in results[0]


@NEEDS_CONTEXTVARS
@@ -1269,391 +1261,6 @@ async def test_subgraph_time_travel_after_completion_async(
    assert "ask_2:answer_2" in replay_result["value"]


-@NEEDS_CONTEXTVARS
-async def test_replay_from_before_interrupt_then_resume_async(
-    async_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Replay from checkpoint before interrupt node, then resume with a new
-    answer and verify the graph completes with the new value.
-
-    Graph: START --> node_a --> ask_human (interrupt) --> node_b --> END
-    """
-
-    called: list[str] = []
-
-    async def node_a(state: State) -> State:
-        called.append("node_a")
-        return {"value": ["a"]}
-
-    async def ask_human(state: State) -> State:
-        called.append("ask_human")
-        answer = interrupt("What is your input?")
-        return {"value": [f"human:{answer}"]}
-
-    async def node_b(state: State) -> State:
-        called.append("node_b")
-        return {"value": ["b"]}
-
-    graph = (
-        StateGraph(State)
-        .add_node("node_a", node_a)
-        .add_node("ask_human", ask_human)
-        .add_node("node_b", node_b)
-        .add_edge(START, "node_a")
-        .add_edge("node_a", "ask_human")
-        .add_edge("ask_human", "node_b")
-        .compile(checkpointer=async_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # --- Original run: invoke until interrupt, then resume to complete ---
-    await graph.ainvoke({"value": []}, config)
-    await graph.ainvoke(Command(resume="old_answer"), config)
-
-    original_history = [s async for s in graph.aget_state_history(config)]
-    original = _checkpoint_summary(original_history)
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
-        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
-        ("loop", ("ask_human",), {"value": ["a"]}),
-        ("loop", ("node_a",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # --- Replay from checkpoint before ask_human ---
-    before_ask = next(s for s in original_history if s.next == ("ask_human",))
-
-    called.clear()
-    replay_result = await graph.ainvoke(None, before_ask.config)
-    assert replay_result["__interrupt__"][0].value == "What is your input?"
-    assert "ask_human" in called
-    assert "node_a" not in called
-
-    # A fork checkpoint is now the latest
-    post_replay = _checkpoint_summary(
-        [s async for s in graph.aget_state_history(config)]
-    )
-    assert [(s["source"], s["next"]) for s in post_replay] == [
-        ("fork", ("ask_human",)),
-        ("loop", ()),
-        ("loop", ("node_b",)),
-        ("loop", ("ask_human",)),
-        ("loop", ("node_a",)),
-        ("input", ("__start__",)),
-    ]
-
-    # --- Resume with a new answer ---
-    called.clear()
-    final_result = await graph.ainvoke(Command(resume="new_answer"), config)
-    assert final_result["value"] == ["a", "human:new_answer", "b"]
-    assert "ask_human" in called
-    assert "node_b" in called
-
-    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch (from fork)
-        ("loop", (), {"value": ["a", "human:new_answer", "b"]}),
-        ("loop", ("node_b",), {"value": ["a", "human:new_answer"]}),
-        ("fork", ("ask_human",), {"value": ["a"]}),
-        # Original branch (preserved)
-        ("loop", (), {"value": ["a", "human:old_answer", "b"]}),
-        ("loop", ("node_b",), {"value": ["a", "human:old_answer"]}),
-        ("loop", ("ask_human",), {"value": ["a"]}),
-        ("loop", ("node_a",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
-@NEEDS_CONTEXTVARS
-async def test_subgraph_time_travel_resume_from_first_interrupt_async(
-    async_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Time travel to a subgraph checkpoint at the first interrupt, then
-    resume through both interrupts with new answers.
-
-    Parent:    START --> executor (subgraph, checkpointer=True) --> END
-    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
-    """
-
-    called: list[str] = []
-
-    async def step_a(state: State) -> State:
-        called.append("step_a")
-        return {"value": ["step_a_done"]}
-
-    async def ask_1(state: State) -> State:
-        called.append("ask_1")
-        answer = interrupt("Question 1?")
-        return {"value": [f"ask_1:{answer}"]}
-
-    async def ask_2(state: State) -> State:
-        called.append("ask_2")
-        answer = interrupt("Question 2?")
-        return {"value": [f"ask_2:{answer}"]}
-
-    executor = (
-        StateGraph(State)
-        .add_node("step_a", step_a)
-        .add_node("ask_1", ask_1)
-        .add_node("ask_2", ask_2)
-        .add_edge(START, "step_a")
-        .add_edge("step_a", "ask_1")
-        .add_edge("ask_1", "ask_2")
-        .add_edge("ask_2", "__end__")
-        .compile(checkpointer=True)
-    )
-
-    graph = (
-        StateGraph(State)
-        .add_node("executor", executor)
-        .add_edge(START, "executor")
-        .compile(checkpointer=async_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # --- Original run: hit both interrupts and resume ---
-    await graph.ainvoke({"value": []}, config)
-    sub_config_at_first = (
-        (await graph.aget_state(config, subgraphs=True)).tasks[0].state.config
-    )
-    await graph.ainvoke(Command(resume="answer_1"), config)
-    await graph.ainvoke(Command(resume="answer_2"), config)
-
-    original = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # --- Time travel to first interrupt's subgraph checkpoint ---
-    called.clear()
-    replay_result = await graph.ainvoke(None, sub_config_at_first)
-    assert replay_result["__interrupt__"][0].value == "Question 1?"
-    assert "step_a" not in called
-
-    # Fork is now the latest parent checkpoint
-    post_tt = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"]) for s in post_tt] == [
-        ("fork", ("executor",)),  # <-- new fork (latest)
-        ("loop", ()),  # original done
-        ("loop", ("executor",)),
-        ("input", ("__start__",)),
-    ]
-
-    # --- Resume both interrupts with new answers ---
-    called.clear()
-    resume_1 = await graph.ainvoke(Command(resume="new_answer_1"), config)
-    assert resume_1["__interrupt__"][0].value == "Question 2?"
-    assert "ask_1" in called
-
-    called.clear()
-    resume_2 = await graph.ainvoke(Command(resume="new_answer_2"), config)
-    assert resume_2["value"] == [
-        "step_a_done",
-        "ask_1:new_answer_1",
-        "ask_2:new_answer_2",
-    ]
-
-    # Verify final history: original branch preserved, new branch appended
-    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch (from time travel fork)
-        (
-            "loop",
-            (),
-            {"value": ["step_a_done", "ask_1:new_answer_1", "ask_2:new_answer_2"]},
-        ),
-        ("fork", ("executor",), {"value": []}),
-        # Original branch (preserved)
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
-@NEEDS_CONTEXTVARS
-async def test_subgraph_time_travel_resume_from_second_interrupt_async(
-    async_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Time travel to a subgraph checkpoint at the second interrupt, then
-    resume with a new answer. The first interrupt's answer should be preserved.
-
-    Parent:    START --> executor (subgraph, checkpointer=True) --> END
-    Executor:  START --> step_a --> ask_1 (interrupt) --> ask_2 (interrupt) --> END
-    """
-
-    called: list[str] = []
-
-    async def step_a(state: State) -> State:
-        called.append("step_a")
-        return {"value": ["step_a_done"]}
-
-    async def ask_1(state: State) -> State:
-        called.append("ask_1")
-        answer = interrupt("Question 1?")
-        return {"value": [f"ask_1:{answer}"]}
-
-    async def ask_2(state: State) -> State:
-        called.append("ask_2")
-        answer = interrupt("Question 2?")
-        return {"value": [f"ask_2:{answer}"]}
-
-    executor = (
-        StateGraph(State)
-        .add_node("step_a", step_a)
-        .add_node("ask_1", ask_1)
-        .add_node("ask_2", ask_2)
-        .add_edge(START, "step_a")
-        .add_edge("step_a", "ask_1")
-        .add_edge("ask_1", "ask_2")
-        .add_edge("ask_2", "__end__")
-        .compile(checkpointer=True)
-    )
-
-    graph = (
-        StateGraph(State)
-        .add_node("executor", executor)
-        .add_edge(START, "executor")
-        .compile(checkpointer=async_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # --- Original run: hit both interrupts and resume ---
-    await graph.ainvoke({"value": []}, config)
-    await graph.ainvoke(Command(resume="answer_1"), config)
-    sub_config_at_second = (
-        (await graph.aget_state(config, subgraphs=True)).tasks[0].state.config
-    )
-    await graph.ainvoke(Command(resume="answer_2"), config)
-
-    original = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # --- Time travel to second interrupt ---
-    called.clear()
-    replay_result = await graph.ainvoke(None, sub_config_at_second)
-    assert replay_result["__interrupt__"][0].value == "Question 2?"
-    assert "step_a" not in called
-    assert "ask_1" not in called
-
-    # Fork is now the latest parent checkpoint
-    post_tt = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"]) for s in post_tt] == [
-        ("fork", ("executor",)),  # <-- new fork (latest)
-        ("loop", ()),  # original done
-        ("loop", ("executor",)),
-        ("input", ("__start__",)),
-    ]
-
-    # --- Resume with a new answer for ask_2 only ---
-    called.clear()
-    resume_result = await graph.ainvoke(Command(resume="new_answer_2"), config)
-    assert resume_result["value"] == [
-        "step_a_done",
-        "ask_1:answer_1",
-        "ask_2:new_answer_2",
-    ]
-
-    # Verify final history
-    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch (from time travel fork)
-        (
-            "loop",
-            (),
-            {"value": ["step_a_done", "ask_1:answer_1", "ask_2:new_answer_2"]},
-        ),
-        ("fork", ("executor",), {"value": []}),
-        # Original branch (preserved)
-        ("loop", (), {"value": ["step_a_done", "ask_1:answer_1", "ask_2:answer_2"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
-@NEEDS_CONTEXTVARS
-async def test_subgraph_time_travel_checkpoint_pattern_async(
-    async_checkpointer: BaseCheckpointSaver,
-) -> None:
-    """Verify the checkpoint pattern created by time travel to a subgraph
-    interrupt. A fork checkpoint should branch from the replay point.
-
-    Parent:    START --> executor (subgraph, checkpointer=True) --> END
-    Executor:  START --> ask (interrupt) --> END
-    """
-
-    async def ask(state: State) -> State:
-        answer = interrupt("Q?")
-        return {"value": [f"a:{answer}"]}
-
-    executor = (
-        StateGraph(State)
-        .add_node("ask", ask)
-        .add_edge(START, "ask")
-        .compile(checkpointer=True)
-    )
-
-    graph = (
-        StateGraph(State)
-        .add_node("executor", executor)
-        .add_edge(START, "executor")
-        .compile(checkpointer=async_checkpointer)
-    )
-
-    config = {"configurable": {"thread_id": "1"}}
-
-    # Run until interrupt, then complete
-    await graph.ainvoke({"value": []}, config)
-    sub_config = (await graph.aget_state(config, subgraphs=True)).tasks[0].state.config
-    await graph.ainvoke(Command(resume="first"), config)
-
-    original = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in original] == [
-        ("loop", (), {"value": ["a:first"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-    # Time travel to the interrupt
-    await graph.ainvoke(None, sub_config)
-
-    # Fork is now the latest, branching from the original replay point
-    post_tt = [s async for s in graph.aget_state_history(config)]
-    post_tt_summary = _checkpoint_summary(post_tt)
-    assert [(s["source"], s["next"]) for s in post_tt_summary] == [
-        ("fork", ("executor",)),  # <-- new fork (latest)
-        ("loop", ()),
-        ("loop", ("executor",)),  # <-- replay point / fork parent
-        ("input", ("__start__",)),
-    ]
-    # Verify the fork's parent is the original replay point
-    replay_point_id = sub_config["configurable"]["checkpoint_map"][""]
-    assert post_tt[0].parent_config["configurable"]["checkpoint_id"] == replay_point_id
-
-    # Resume from the fork
-    result = await graph.ainvoke(Command(resume="second"), config)
-    assert result["value"] == ["a:second"]
-
-    final = _checkpoint_summary([s async for s in graph.aget_state_history(config)])
-    assert [(s["source"], s["next"], s["values"]) for s in final] == [
-        # New branch
-        ("loop", (), {"value": ["a:second"]}),
-        ("fork", ("executor",), {"value": []}),
-        # Original branch
-        ("loop", (), {"value": ["a:first"]}),
-        ("loop", ("executor",), {"value": []}),
-        ("input", ("__start__",), {"value": []}),
-    ]
-
-
@NEEDS_CONTEXTVARS
 async def test_3_levels_deep_time_travel_to_first_interrupt_async(
    async_checkpointer: BaseCheckpointSaver,
@@ -2481,15 +2088,13 @@ async def test_replay_creates_branch_preserving_old_checkpoints(
    # -- Post-replay checkpoint history (newest first) --
    post_replay_history = [s async for s in graph.aget_state_history(config)]
    post_summary = _checkpoint_summary(post_replay_history)
-    # 5 original + 1 fork + 2 new branch checkpoints = 8
-    assert len(post_summary) == 8
+    assert len(post_summary) == 7  # 5 original + 2 new branch checkpoints

    assert [s["next"] for s in post_summary] == [
-        (),  # new branch tip
-        ("node_c",),  # new branch
-        ("node_b",),  # fork from replay point
-        (),  # old branch tip
-        ("node_c",),  # old
+        (),  # new branch tip (C6)
+        ("node_c",),  # new branch (C5)
+        (),  # old branch tip (C4)
+        ("node_c",),  # old (C3)
        ("node_b",),  # branch point (C2)
        ("node_a",),  # old (C1)
        ("__start__",),  # old (C0)
@@ -2497,7 +2102,6 @@ async def test_replay_creates_branch_preserving_old_checkpoints(
    assert [s["values"] for s in post_summary] == [
        {"value": ["a", "b2", "c"]},  # new branch tip
        {"value": ["a", "b2"]},  # new: node_b re-ran with call_count=2
-        {"value": ["a"]},  # fork from replay point
        {"value": ["a", "b1", "c"]},  # old branch tip preserved
        {"value": ["a", "b1"]},  # old
        {"value": ["a"]},  # branch point
@@ -11,19 +11,13 @@ from typing import (
    TypeVar,
    Union,
 )
-from unittest.mock import MagicMock, patch
+from unittest.mock import patch

 import langsmith
 import pytest
-from langchain_core.runnables import RunnableConfig
-from langchain_core.tracers import LangChainTracer
 from typing_extensions import NotRequired, Required, TypedDict

-from langgraph._internal._config import (
-    _is_not_empty,
-    ensure_config,
-    get_callback_manager_for_config,
-)
+from langgraph._internal._config import _is_not_empty, ensure_config
 from langgraph._internal._fields import (
    _is_optional_type,
    get_enhanced_type_hints,
@@ -304,7 +298,7 @@ def test_is_not_empty() -> None:
    assert not _is_not_empty({})


-def test_configurable_metadata() -> None:
+def test_configurable_metadata():
    config = {
        "configurable": {
            "a-key": "foo",
@@ -315,115 +309,11 @@ def test_configurable_metadata() -> None:
            "andme": 42,
            "nested": {"foo": "bar"},
            "nooverride": -2,
-            "thread_id": "th-123",
-            "checkpoint_id": "ckpt-1",
-            "checkpoint_ns": "ns-1",
-            "task_id": "task-1",
-            "run_id": "run-456",
-            "assistant_id": "asst-789",
-            "graph_id": "graph-0",
-            "model": "gpt-4o",
-            "user_id": "uid-1",
-            "cron_id": "cron-1",
-            "langgraph_auth_user_id": "user-1",
        },
        "metadata": {"nooverride": 18},
    }
+    expected = {"includeme", "andme", "nooverride"}
    merged = ensure_config(config)
    metadata = merged["metadata"]
-    assert set(metadata) == {
-        "nooverride",
-        "assistant_id",
-        "thread_id",
-        "checkpoint_id",
-        "run_id",
-        "graph_id",
-        "checkpoint_ns",
-        "task_id",
-    }
+    assert metadata.keys() == expected
    assert metadata["nooverride"] == 18
-
-
-def test_callback_manager_copies_whitelisted_configurable_ids_to_metadata() -> None:
-    config = {
-        "configurable": {
-            "thread_id": "th-123",
-            "checkpoint_id": "ckpt-1",
-            "checkpoint_ns": "ns-1",
-            "task_id": "task-1",
-            "run_id": "run-456",
-            "assistant_id": "asst-789",
-            "graph_id": "graph-0",
-            "model": "gpt-4o",
-            "user_id": "uid-1",
-            "cron_id": "cron-1",
-            "langgraph_auth_user_id": "user-1",
-        },
-        "metadata": {
-            "thread_id": "from-metadata",
-            "nooverride": 18,
-        },
-    }
-    manager = ensure_config(config)
-    callback_manager = get_callback_manager_for_config(manager)
-    assert callback_manager.metadata == {
-        "thread_id": "from-metadata",
-        "nooverride": 18,
-        "checkpoint_id": "ckpt-1",
-        "checkpoint_ns": "ns-1",
-        "task_id": "task-1",
-        "run_id": "run-456",
-        "assistant_id": "asst-789",
-        "graph_id": "graph-0",
-    }
-
-
-def test_callback_manager_copies_configurable_ids_to_tracing_metadata() -> None:
-    tracer = LangChainTracer(client=MagicMock())
-    config: RunnableConfig = {
-        "configurable": {
-            "thread_id": "th-123",
-            "checkpoint_id": "ckpt-1",
-            "checkpoint_ns": "ns-1",
-            "task_id": "task-1",
-            "run_id": "run-456",
-            "assistant_id": "asst-789",
-            "graph_id": "graph-0",
-            "model": "gpt-4o",
-            "user_id": "uid-1",
-            "cron_id": "cron-1",
-            "langgraph_auth_user_id": "user-1",
-            "includeme": "hi",
-            "andme": 42,
-            "__dontinclude": "bar",
-            "some_api_key": "secret",
-            "custom_setting": {"nested": True},
-        },
-        "metadata": {
-            "thread_id": "from-metadata",
-            "user_id": "from-metadata-user",
-            "includeme": "from-metadata",
-        },
-        "callbacks": [tracer],
-    }
-
-    manager = ensure_config(config)
-    callback_manager = get_callback_manager_for_config(manager)
-    handlers = callback_manager.handlers
-    tracers = [handler for handler in handlers if isinstance(handler, LangChainTracer)]
-    assert len(tracers) == 1
-    tracer = tracers[0]
-    assert tracer.tracing_metadata == {
-        "checkpoint_id": "ckpt-1",
-        "checkpoint_ns": "ns-1",
-        "task_id": "task-1",
-        "run_id": "run-456",
-        "assistant_id": "asst-789",
-        "graph_id": "graph-0",
-        "model": "gpt-4o",
-        "cron_id": "cron-1",
-        "andme": 42,
-        "includeme": "hi",
-        "thread_id": "th-123",
-        "user_id": "uid-1",
-    }
@@ -1348,7 +1348,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.3.0"
+version = "1.2.22"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
@@ -1360,14 +1360,14 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/92/fe/20190232d9b513242899dbb0c2bb77e31b4d61e343743adbe90ebc2603d2/langchain_core-1.3.0.tar.gz", hash = "sha256:14a39f528bf459aa3aa40d0a7f7f1bae7520d435ef991ae14a4ceb74d8c49046", size = 860755, upload-time = "2026-04-17T14:51:38.298Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/b1/a3/c4cd6827a1df46c821e7214b7f7b7a28b189e6c9b84ef15c6d629c5e3179/langchain_core-1.2.22.tar.gz", hash = "sha256:8d8f726d03d3652d403da915126626bb6250747e8ba406537d849e68b9f5d058", size = 842487, upload-time = "2026-03-24T18:48:44.9Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/f8/e2/dbfa347aa072a6dc4cd38d6f9ebfc730b4c14c258c47f480f4c5c546f177/langchain_core-1.3.0-py3-none-any.whl", hash = "sha256:baf16ee028475df177b9ab8869a751c79406d64a6f12125b93802991b566cced", size = 515140, upload-time = "2026-04-17T14:51:36.274Z" },
+    { url = "https://files.pythonhosted.org/packages/c7/a6/2ffacf0f1a3788f250e75d0b52a24896c413be11be3a6d42bcdf46fbea48/langchain_core-1.2.22-py3-none-any.whl", hash = "sha256:7e30d586b75918e828833b9ec1efc25465723566845dd652c277baf751e9c04b", size = 506829, upload-time = "2026-03-24T18:48:43.286Z" },
 ]

 [[package]]
 name = "langgraph"
-version = "1.1.7"
+version = "1.1.7a1"
 source = { editable = "." }
 dependencies = [
    { name = "langchain-core" },
@@ -1439,7 +1439,7 @@ test = [

 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=1.3.0,<2" },
+    { name = "langchain-core", specifier = ">=0.1" },
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-prebuilt", editable = "../prebuilt" },
    { name = "langgraph-sdk", editable = "../sdk-py" },
@@ -1548,7 +1548,7 @@ wheels = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.2"
+version = "4.0.1"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -1852,7 +1852,7 @@ test = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.6.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -1862,12 +1862,11 @@ dependencies = [
    { name = "requests" },
    { name = "requests-toolbelt" },
    { name = "uuid-utils" },
-    { name = "xxhash" },
    { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e7/85/9c7933052a997da1b85bc5c774f3865e9b1da1c8d71541ea133178b13229/langsmith-0.6.4.tar.gz", hash = "sha256:36f7223a01c218079fbb17da5e536ebbaf5c1468c028abe070aa3ae59bc99ec8", size = 919964, upload-time = "2026-01-15T20:02:28.873Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
+    { url = "https://files.pythonhosted.org/packages/66/0f/09a6637a7ba777eb307b7c80852d9ee26438e2bdafbad6fcc849ff9d9192/langsmith-0.6.4-py3-none-any.whl", hash = "sha256:ac4835860160be371042c7adbba3cb267bcf8d96a5ea976c33a8a4acad6c5486", size = 283503, upload-time = "2026-01-15T20:02:26.662Z" },
 ]

 [package.optional-dependencies]
@@ -2906,7 +2905,7 @@ wheels = [

 [[package]]
 name = "pytest"
-version = "9.0.3"
+version = "9.0.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -2917,9 +2916,9 @@ dependencies = [
    { name = "pygments" },
    { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/d4/24/a372aaf5c9b7208e7112038812994107bc65a84cd00e0354a88c2c77a617/pytest-9.0.3-py3-none-any.whl", hash = "sha256:2c5efc453d45394fdd706ade797c0a81091eccd1d6e4bccfcd476e2b8e0ab5d9", size = 375249, upload-time = "2026-04-07T17:16:16.13Z" },
+    { url = "https://files.pythonhosted.org/packages/3b/ab/b3226f0bd7cdcf710fbede2b3548584366da3b19b5021e74f5bde2a8fa3f/pytest-9.0.2-py3-none-any.whl", hash = "sha256:711ffd45bf766d5264d487b917733b453d917afd2b0ad65223959f59089f875b", size = 374801, upload-time = "2025-12-06T21:30:49.154Z" },
 ]

 [[package]]
@@ -614,7 +614,6 @@ class _InjectedArgs:
    store: str | None
    runtime: str | None
    all_injected_keys: set[str]
-    _optional_state_args: set[str]


 class ToolNode(RunnableCallable):
@@ -1334,7 +1333,7 @@ class ToolNode(RunnableCallable):
            return tool_call

        tool_call_copy: ToolCall = copy(tool_call)
-        injected_args: dict[str, Any] = {}
+        injected_args = {}

        # Inject state
        if injected.state:
@@ -1362,20 +1361,14 @@ class ToolNode(RunnableCallable):
            # Extract state values
            if isinstance(state, dict):
                for tool_arg, state_field in injected.state.items():
-                    if not state_field:
-                        injected_args[tool_arg] = state
-                    elif state_field in state:
-                        injected_args[tool_arg] = state[state_field]
-                    elif tool_arg not in injected._optional_state_args:
-                        raise KeyError(state_field)
+                    injected_args[tool_arg] = (
+                        state[state_field] if state_field else state
+                    )
            else:
                for tool_arg, state_field in injected.state.items():
-                    if not state_field:
-                        injected_args[tool_arg] = state
-                    elif hasattr(state, state_field):
-                        injected_args[tool_arg] = getattr(state, state_field)
-                    elif tool_arg not in injected._optional_state_args:
-                        raise AttributeError(state_field)
+                    injected_args[tool_arg] = (
+                        getattr(state, state_field) if state_field else state
+                    )

        # Inject store
        if injected.store:
@@ -1866,7 +1859,6 @@ def _get_all_injected_args(tool: BaseTool) -> _InjectedArgs:
    store_arg: str | None = None
    runtime_arg: str | None = None
    all_injected_keys: set[str] = set()
-    _optional_state_args: set[str] = set()

    for name, type_ in all_annotations.items():
        # Track all InjectedToolArg-annotated params (including custom subclasses)
@@ -1881,9 +1873,6 @@ def _get_all_injected_args(tool: BaseTool) -> _InjectedArgs:
        if state_inj := _get_injection_from_type(type_, InjectedState):
            if isinstance(state_inj, InjectedState) and state_inj.field:
                state_args[name] = state_inj.field
-                field_info = full_schema.model_fields.get(name)
-                if field_info and not field_info.is_required():
-                    _optional_state_args.add(name)
            else:
                state_args[name] = None

@@ -1900,5 +1889,4 @@ def _get_all_injected_args(tool: BaseTool) -> _InjectedArgs:
        store=store_arg,
        runtime=runtime_arg,
        all_injected_keys=all_injected_keys,
-        _optional_state_args=_optional_state_args,
    )
@@ -1,284 +0,0 @@
-"""Test InjectedState with NotRequired state fields.
-
-This tests the fix for https://github.com/langchain-ai/langchain/issues/35585
-
-When using InjectedState(<field>) on a tool parameter, and the referenced field is
-declared as NotRequired in the custom state schema, the ToolNode should gracefully
-handle missing fields by injecting None instead of raising KeyError.
-"""
-
-import sys
-from typing import Annotated
-
-import pytest
-from langchain_core.messages import AIMessage, AnyMessage, HumanMessage, ToolMessage
-from langchain_core.tools import tool
-from langgraph.graph.message import add_messages
-from pydantic import BaseModel, Field
-from typing_extensions import NotRequired
-
-from langgraph.prebuilt import InjectedState, ToolNode, create_react_agent
-from langgraph.prebuilt.chat_agent_executor import AgentState
-
-from .model import FakeToolCallingModel
-
-
-class CustomAgentStateWithNotRequired(AgentState):
-    """Custom state with a NotRequired field (TypedDict style)."""
-
-    city: NotRequired[str]
-
-
-class CustomAgentStatePydanticWithDefault(BaseModel):
-    """Custom state with Optional field and default (Pydantic style)."""
-
-    messages: Annotated[list[AnyMessage], add_messages]
-    remaining_steps: int = Field(default=10)
-    city: str | None = Field(default=None)
-
-
-@tool
-def get_weather(city: Annotated[str | None, InjectedState("city")] = None) -> str:
-    """Get weather for a given city."""
-    if city is None:
-        return "No city provided"
-    return f"It's always sunny in {city}!"
-
-
-def _create_mock_runtime(
-    state: dict | None = None,
-    store=None,
-):
-    """Create a mock Runtime for testing ToolNode directly."""
-    from unittest.mock import Mock
-
-    from langgraph.runtime import Runtime
-
-    mock_runtime = Mock(spec=Runtime)
-    mock_runtime.context = {}
-    return mock_runtime
-
-
-def _create_config_with_runtime(store=None, state=None):
-    """Create a RunnableConfig with mocked runtime for direct ToolNode testing."""
-    from langgraph.prebuilt.tool_node import ToolRuntime
-
-    tool_runtime = ToolRuntime(
-        state=state or {},
-        config={},
-        context={},
-        store=store,
-        stream_writer=None,
-        tool_call_id="test_id",
-    )
-    return {
-        "configurable": {
-            "__pregel_runtime": _create_mock_runtime(),
-            "__tool_runtime__": tool_runtime,
-        }
-    }
-
-
-@pytest.mark.skipif(
-    sys.version_info < (3, 11),
-    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
-)
-def test_injected_state_not_required_field_missing_injects_none():
-    """Test that InjectedState with NotRequired field injects None when field is missing.
-
-    This verifies the fix for https://github.com/langchain-ai/langchain/issues/35585
-    """
-    tool_node = ToolNode([get_weather])
-
-    tool_call = {
-        "name": "get_weather",
-        "args": {},
-        "id": "call_1",
-        "type": "tool_call",
-    }
-    ai_msg = AIMessage("Let me check the weather", tool_calls=[tool_call])
-
-    # State WITHOUT the "city" field - should inject None instead of raising KeyError
-    state_without_city: CustomAgentStateWithNotRequired = {
-        "messages": [HumanMessage("What's the weather?"), ai_msg],
-    }
-
-    result = tool_node.invoke(
-        state_without_city,
-        config=_create_config_with_runtime(state=state_without_city),
-    )
-
-    assert len(result["messages"]) == 1
-    tool_msg = result["messages"][0]
-    assert isinstance(tool_msg, ToolMessage)
-    assert "No city provided" in tool_msg.content
-
-
-@pytest.mark.skipif(
-    sys.version_info < (3, 11),
-    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
-)
-def test_injected_state_not_required_field_present_works():
-    """Test that InjectedState with NotRequired field works when field IS present."""
-    tool_node = ToolNode([get_weather])
-
-    tool_call = {
-        "name": "get_weather",
-        "args": {},
-        "id": "call_1",
-        "type": "tool_call",
-    }
-    ai_msg = AIMessage("Let me check the weather", tool_calls=[tool_call])
-
-    # State WITH the "city" field - this should work
-    state_with_city: CustomAgentStateWithNotRequired = {
-        "messages": [HumanMessage("What's the weather?"), ai_msg],
-        "city": "San Francisco",
-    }
-
-    result = tool_node.invoke(
-        state_with_city,
-        config=_create_config_with_runtime(state=state_with_city),
-    )
-
-    assert len(result["messages"]) == 1
-    tool_msg = result["messages"][0]
-    assert isinstance(tool_msg, ToolMessage)
-    assert "San Francisco" in tool_msg.content
-
-
-@pytest.mark.skipif(
-    sys.version_info < (3, 11),
-    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
-)
-def test_create_react_agent_injected_state_not_required_field_missing():
-    """Test create_react_agent with InjectedState using NotRequired field that is missing.
-
-    This verifies the fix for https://github.com/langchain-ai/langchain/issues/35585
-    """
-    model = FakeToolCallingModel(
-        tool_calls=[
-            [{"name": "get_weather", "args": {}, "id": "call_1"}],
-            [],  # No more tool calls, agent should stop
-        ]
-    )
-
-    agent = create_react_agent(
-        model,
-        tools=[get_weather],
-        state_schema=CustomAgentStateWithNotRequired,
-    )
-
-    # Invoke WITHOUT the city field - should work, injecting None
-    result = agent.invoke(
-        {"messages": [HumanMessage("What's the weather?")]},
-    )
-
-    # Check that the tool was called successfully with None injected
-    messages = result["messages"]
-    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
-    assert len(tool_messages) == 1
-    assert "No city provided" in tool_messages[0].content
-
-
-@pytest.mark.skipif(
-    sys.version_info < (3, 11),
-    reason="InjectedState field extraction from Optional[Annotated[...]] not supported on Python <3.11",
-)
-def test_create_react_agent_injected_state_not_required_field_present():
-    """Test create_react_agent with InjectedState using NotRequired field that IS present."""
-    model = FakeToolCallingModel(
-        tool_calls=[
-            [{"name": "get_weather", "args": {}, "id": "call_1"}],
-            [],  # No more tool calls, agent should stop
-        ]
-    )
-
-    agent = create_react_agent(
-        model,
-        tools=[get_weather],
-        state_schema=CustomAgentStateWithNotRequired,
-    )
-
-    # Invoke WITH the city field
-    result = agent.invoke(
-        {
-            "messages": [HumanMessage("What's the weather?")],
-            "city": "San Francisco",
-        },
-    )
-
-    # Check that the tool was called successfully
-    messages = result["messages"]
-    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
-    assert len(tool_messages) == 1
-    assert "San Francisco" in tool_messages[0].content
-
-
-@tool
-def get_weather_optional(city: Annotated[str | None, InjectedState("city")]) -> str:
-    """Get weather for a given city (accepts None)."""
-    if city is None:
-        return "Please provide a city!"
-    return f"It's always sunny in {city}!"
-
-
-def test_pydantic_state_with_default_field_missing_works():
-    """Test that Pydantic state with Optional field and default=None works when field is missing.
-
-    This is the workaround suggested in the issue comments - using Pydantic BaseModel
-    with `city: Optional[str] = Field(default=None)` instead of TypedDict with NotRequired.
-    """
-    model = FakeToolCallingModel(
-        tool_calls=[
-            [{"name": "get_weather_optional", "args": {}, "id": "call_1"}],
-            [],  # No more tool calls, agent should stop
-        ]
-    )
-
-    agent = create_react_agent(
-        model,
-        tools=[get_weather_optional],
-        state_schema=CustomAgentStatePydanticWithDefault,
-    )
-
-    # Invoke WITHOUT the city field - should work because Pydantic provides default
-    result = agent.invoke(
-        {"messages": [HumanMessage("What's the weather?")]},
-    )
-
-    # Check that the tool was called successfully with None
-    messages = result["messages"]
-    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
-    assert len(tool_messages) == 1
-    assert "Please provide a city!" in tool_messages[0].content
-
-
-def test_pydantic_state_with_default_field_present_works():
-    """Test that Pydantic state with Optional field works when field IS present."""
-    model = FakeToolCallingModel(
-        tool_calls=[
-            [{"name": "get_weather_optional", "args": {}, "id": "call_1"}],
-            [],  # No more tool calls, agent should stop
-        ]
-    )
-
-    agent = create_react_agent(
-        model,
-        tools=[get_weather_optional],
-        state_schema=CustomAgentStatePydanticWithDefault,
-    )
-
-    # Invoke WITH the city field
-    result = agent.invoke(
-        {
-            "messages": [HumanMessage("What's the weather?")],
-            "city": "San Francisco",
-        },
-    )
-
-    # Check that the tool was called successfully
-    messages = result["messages"]
-    tool_messages = [m for m in messages if isinstance(m, ToolMessage)]
-    assert len(tool_messages) == 1
-    assert "San Francisco" in tool_messages[0].content
@@ -249,7 +249,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.3.0"
+version = "1.2.25"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
@@ -261,14 +261,14 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/92/fe/20190232d9b513242899dbb0c2bb77e31b4d61e343743adbe90ebc2603d2/langchain_core-1.3.0.tar.gz", hash = "sha256:14a39f528bf459aa3aa40d0a7f7f1bae7520d435ef991ae14a4ceb74d8c49046", size = 860755, upload-time = "2026-04-17T14:51:38.298Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/86/2a/d65de24fc9b7989137253da8973f850f3e39b4ce3e0377bc8200d6b3c189/langchain_core-1.2.25.tar.gz", hash = "sha256:77e032b96509d0eb1f6875042fdf97b7e2334a815314700c6894d9d078909b9c", size = 842347, upload-time = "2026-04-02T22:39:11.528Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/f8/e2/dbfa347aa072a6dc4cd38d6f9ebfc730b4c14c258c47f480f4c5c546f177/langchain_core-1.3.0-py3-none-any.whl", hash = "sha256:baf16ee028475df177b9ab8869a751c79406d64a6f12125b93802991b566cced", size = 515140, upload-time = "2026-04-17T14:51:36.274Z" },
+    { url = "https://files.pythonhosted.org/packages/3d/0e/7b31b0249f9b9b0fc7829d5b0ee484b8f8d43c78e376e9951e2ef3eac70c/langchain_core-1.2.25-py3-none-any.whl", hash = "sha256:0c05bf395aec6d2dfa14488fd006f7bcd0540e7e89287e04f92203532a82c828", size = 506866, upload-time = "2026-04-02T22:39:10.137Z" },
 ]

 [[package]]
 name = "langgraph"
-version = "1.1.7"
+version = "1.1.7a1"
 source = { editable = "../langgraph" }
 dependencies = [
    { name = "langchain-core" },
@@ -281,7 +281,7 @@ dependencies = [

 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=1.3.0,<2" },
+    { name = "langchain-core", specifier = ">=0.1" },
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-prebuilt", editable = "." },
    { name = "langgraph-sdk", editable = "../sdk-py" },
@@ -352,7 +352,7 @@ test = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.2"
+version = "4.0.1"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -619,7 +619,7 @@ test = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.6.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "httpx" },
@@ -629,12 +629,11 @@ dependencies = [
    { name = "requests" },
    { name = "requests-toolbelt" },
    { name = "uuid-utils" },
-    { name = "xxhash" },
    { name = "zstandard" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/e6/11/696019490992db5c87774dc20515529ef42a01e1d770fb754ed6d9b12fb0/langsmith-0.7.31.tar.gz", hash = "sha256:331ee4f7c26bb5be4022b9859b7d7b122cbf8c9d01d9f530114c1914b0349ffb", size = 1178480, upload-time = "2026-04-14T17:55:41.242Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/e7/85/9c7933052a997da1b85bc5c774f3865e9b1da1c8d71541ea133178b13229/langsmith-0.6.4.tar.gz", hash = "sha256:36f7223a01c218079fbb17da5e536ebbaf5c1468c028abe070aa3ae59bc99ec8", size = 919964, upload-time = "2026-01-15T20:02:28.873Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/1d/a1/a013cf458c301cda86a213dd153ce0a01c93f1ab5833f951e6a44c9763ce/langsmith-0.7.31-py3-none-any.whl", hash = "sha256:0291d49203f6e80dda011af1afda61eb0595a4d697adb684590a8805e1d61fb6", size = 373276, upload-time = "2026-04-14T17:55:39.677Z" },
+    { url = "https://files.pythonhosted.org/packages/66/0f/09a6637a7ba777eb307b7c80852d9ee26438e2bdafbad6fcc849ff9d9192/langsmith-0.6.4-py3-none-any.whl", hash = "sha256:ac4835860160be371042c7adbba3cb267bcf8d96a5ea976c33a8a4acad6c5486", size = 283503, upload-time = "2026-01-15T20:02:26.662Z" },
 ]

 [[package]]
@@ -1183,7 +1182,7 @@ wheels = [

 [[package]]
 name = "pytest"
-version = "9.0.3"
+version = "9.0.2"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "colorama", marker = "sys_platform == 'win32'" },
@@ -1194,9 +1193,9 @@ dependencies = [
    { name = "pygments" },
    { name = "tomli", marker = "python_full_version < '3.11'" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/7d/0d/549bd94f1a0a402dc8cf64563a117c0f3765662e2e668477624baeec44d5/pytest-9.0.3.tar.gz", hash = "sha256:b86ada508af81d19edeb213c681b1d48246c1a91d304c6c81a427674c17eb91c", size = 1572165, upload-time = "2026-04-07T17:16:18.027Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d1/db/7ef3487e0fb0049ddb5ce41d3a49c235bf9ad299b6a25d5780a89f19230f/pytest-9.0.2.tar.gz", hash = "sha256:75186651a92bd89611d1d9fc20f0b4345fd827c41ccd5c299a868a05d70edf11", size = 1568901, upload-time = "2025-12-06T21:30:51.014Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/3b/ab/b3226f0bd7cdcf710fbede2b3548584366da3b19b5021e74f5bde2a8fa3f/pytest-9.0.2-py3-none-any.whl", hash = "sha256:711ffd45bf766d5264d487b917733b453d917afd2b0ad65223959f59089f875b", size = 374801, upload-time = "2025-12-06T21:30:49.154Z" },
 ]

 [[package]]
@@ -262,7 +262,7 @@ wheels = [

 [[package]]
 name = "langchain-core"
-version = "1.3.0"
+version = "1.2.28"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
    { name = "jsonpatch" },
@@ -274,14 +274,14 @@ dependencies = [
    { name = "typing-extensions" },
    { name = "uuid-utils" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/92/fe/20190232d9b513242899dbb0c2bb77e31b4d61e343743adbe90ebc2603d2/langchain_core-1.3.0.tar.gz", hash = "sha256:14a39f528bf459aa3aa40d0a7f7f1bae7520d435ef991ae14a4ceb74d8c49046", size = 860755, upload-time = "2026-04-17T14:51:38.298Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/a4/317a1a3ac1df33a64adb3670bf88bbe3b3d5baa274db6863a979db472897/langchain_core-1.2.28.tar.gz", hash = "sha256:271a3d8bd618f795fdeba112b0753980457fc90537c46a0c11998516a74dc2cb", size = 846119, upload-time = "2026-04-08T18:19:34.867Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/a8/92/32f785f077c7e898da97064f113c73fbd9ad55d1e2169cf3a391b183dedb/langchain_core-1.2.28-py3-none-any.whl", hash = "sha256:80764232581eaf8057bcefa71dbf8adc1f6a28d257ebd8b95ba9b8b452e8c6ac", size = 508727, upload-time = "2026-04-08T18:19:32.823Z" },
 ]

 [[package]]
 name = "langgraph"
-version = "1.1.7"
+version = "1.1.7a1"
 source = { editable = "../langgraph" }
 dependencies = [
    { name = "langchain-core" },
@@ -294,7 +294,7 @@ dependencies = [

 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=1.3.0,<2" },
+    { name = "langchain-core", specifier = ">=0.1" },
    { name = "langgraph-checkpoint", editable = "../checkpoint" },
    { name = "langgraph-prebuilt", editable = "../prebuilt" },
    { name = "langgraph-sdk", editable = "." },
@@ -365,7 +365,7 @@ test = [

 [[package]]
 name = "langgraph-checkpoint"
-version = "4.0.2"
+version = "4.0.1"
 source = { editable = "../checkpoint" }
 dependencies = [
    { name = "langchain-core" },
@@ -534,7 +534,7 @@ test = [

 [[package]]
 name = "langsmith"
-version = "0.7.31"
+version = "0.7.20"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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@@ -547,9 +547,9 @@ dependencies = [
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    { name = "zstandard" },
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+sdist = { url = "https://files.pythonhosted.org/packages/80/c6/cbdc6638207f68a3c61ec0b64fa593f6b11de3170d03c852238c31b54960/langsmith-0.7.20.tar.gz", hash = "sha256:fa983a74f75648ee0e80d3f9751162b6f9a438896d5f9bdb6cba9abda451e234", size = 1134732, upload-time = "2026-03-18T00:03:39.129Z" }
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 [[package]]
@@ -1000,7 +1000,7 @@ wheels = [

 [[package]]
 name = "pytest"
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+version = "9.0.2"
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@@ -1011,9 +1011,9 @@ dependencies = [
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 [[package]]
Author	SHA1	Message	Date
Will Fu-Hinthorn	8393182893	update loop	2026-04-14 05:51:25 -07:00
Will Fu-Hinthorn	488c1af383	merge	2026-04-13 08:17:42 -07:00
Will Fu-Hinthorn	fbcdbb5e0c	update	2026-04-10 14:23:21 -07:00
Will Fu-Hinthorn	7f225ef93e	chore: Backpressure	2026-04-09 17:35:59 -07:00