Type safety w generics

- rm langchain_core dependency
- replace callbacks w run tree
- rm Runnable dependency
- rm non-state Graph
- rm managed values
- rm entrypoint/task/call
- rm async methods
- rm shallow checkpointer
- rm messages stream mode
- rm debug flag
- rm remote graph

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -1,72 +1,44 @@
 name: "\U0001F41B Bug Report"
-description: Report a bug in LangGraph. To report a security issue, please instead use the security option (below). For questions, please use the LangChain forum (below).
-labels: ["bug"]
-type: bug
+description: Report a bug in LangGraph. To report a security issue, please instead use the security option below. For questions, please use the GitHub Discussions.
+labels: ["02 Bug Report"]
 body:
   - type: markdown
     attributes:
-      value: |
-        Thank you for taking the time to file a bug report.
-
-        > **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
-
-        For usage questions, feature requests and general design questions, please use the [LangChain Forum](https://forum.langchain.com/).
-
-        Check these before submitting to see if your issue has already been reported, fixed or if there's another way to solve your problem:
-
-        * [Documentation](https://docs.langchain.com/oss/python/langgraph/overview),
-        * [API Reference Documentation](https://reference.langchain.com/python/),
-        * [LangChain ChatBot](https://chat.langchain.com/)
-        * [GitHub search](https://github.com/langchain-ai/langgraph),
-        * [LangChain Forum](https://forum.langchain.com/),
+      value: >
+        Thank you for taking the time to file a bug report. 
+        
+        Use this to report BUGS in LangGraph. For usage questions, feature requests and general design questions, please use [GitHub Discussions](https://github.com/langchain-ai/langgraph/discussions).
+        
+        Relevant links to check before filing a bug report to see if your issue has already been reported, fixed or
+        if there's another way to solve your problem:
+        
+        [LangGraph Github Discussions](https://github.com/langchain-ai/langgraph/discussions),
+        [LangGraph Github Issues](https://github.com/langchain-ai/langgraph/issues),
+        [LangGraph how-to guides](https://langchain-ai.github.io/langgraph/how-tos/).
+        [LangChain documentation with the integrated search](https://python.langchain.com/docs/get_started/introduction),
+        [GitHub search](https://github.com/langchain-ai/langgraph),
   - type: checkboxes
     id: checks
     attributes:
       label: Checked other resources
-      description: Please confirm and check all the following options.
+      description: Before submitting this issue, please confirm that you have completed all the steps below by checking each option. These steps help ensure your issue is well-defined, relevant, and actionable.
       options:
-        - label: This is a bug, not a usage question.
+        - label: This is a bug, not a usage question. For questions, please use GitHub Discussions.
           required: true
-        - label: I added a clear and descriptive title that summarizes this issue.
+        - label: I added a clear and detailed title that summarizes the issue.
           required: true
-        - label: I used the GitHub search to find a similar question and didn't find it.
+        - label: I read what a minimal reproducible example is (https://stackoverflow.com/help/minimal-reproducible-example).
           required: true
-        - label: I am sure that this is a bug in LangGraph rather than my code.
+        - label: I included a self-contained, minimal example that demonstrates the issue INCLUDING all the relevant imports. The code run AS IS to reproduce the issue.
           required: true
-        - label: The bug is not resolved by updating to the latest stable version of LangGraph (or the specific integration package).
-          required: true
-        - label: This is not related to the langchain-community package.
-          required: true
-        - label: I posted a self-contained, minimal, reproducible example. A maintainer can copy it and run it AS IS.
-          required: true
-  - type: textarea
-    id: related
-    validations:
-      required: false
-    attributes:
-      label: Related Issues / PRs
-      description: |
-        If this bug is related to any existing issues or pull requests, please link them here.
-      placeholder: |
-        * e.g. #123, #456
   - type: textarea
     id: reproduction
     validations:
       required: true
     attributes:
-      label: Reproduction Steps / Example Code (Python)
+      label: Example Code
       description: |
         Please add a self-contained, [minimal, reproducible, example](https://stackoverflow.com/help/minimal-reproducible-example) with your use case.
-
-        If a maintainer can copy it, run it, and see it right away, there's a much higher chance that you'll be able to get help.
-
-        **Important!**
-
-        * Avoid screenshots, as they are hard to read and (more importantly) don't allow others to copy-and-paste your code.
-        * Reduce your code to the minimum required to reproduce the issue if possible.
-
-        (This will be automatically formatted into code, so no need for backticks.)
-      render: python
       placeholder: |
         from langgraph.graph import StateGraph
 
@@ -75,13 +47,17 @@ body:
           
         chain = StateGraph(list)
         chain.invoke('Hello!')
+      render: python
   - type: textarea
+    id: error
+    validations:
+      required: false
     attributes:
       label: Error Message and Stack Trace (if applicable)
       description: |
-        If you are reporting an error, please copy and paste the full error message and
-        stack trace.
-        (This will be automatically formatted into code, so no need for backticks.)
+        If you are reporting an error, please include the full error message and stack trace.
+      placeholder: |
+        Exception + full stack trace
       render: shell
   - type: textarea
     id: description
@@ -102,18 +78,7 @@ body:
     attributes:
       label: System Info
       description: |
-        Please share your system info with us.
-
-        Run the following command in your terminal and paste the output here:
-
-        `python -m langchain_core.sys_info`
-
-        or if you have an existing python interpreter running:
-
-        ```python
-        from langchain_core import sys_info
-        sys_info.print_sys_info()
-        ```
+        python -m langchain_core.sys_info
       placeholder: |
         python -m langchain_core.sys_info
     validations:

.github/ISSUE_TEMPLATE/config.yml

@@ -1,15 +1,15 @@
 blank_issues_enabled: false
 version: 2.1
 contact_links:
-  - name: 💬 LangChain Forum
-    url: https://forum.langchain.com/
-    about: General community discussions and support
-  - name: 📚 LangGraph Documentation
-    url: https://docs.langchain.com/oss/python/langgraph/overview
-    about: View the official LangGraph documentation
-  - name: 📚 API Reference Documentation
-    url: https://reference.langchain.com/python/langgraph/
-    about: View the official LangGraph API reference documentation
-  - name: 📚 Documentation issue
-    url: https://github.com/langchain-ai/docs/issues/new?template=02-langgraph.yml
-    about: Report an issue related to the LangGraph documentation
+  - name: 🤔 Question or Problem
+    about: Ask a question or ask about a problem in GitHub Discussions.
+    url: https://github.com/langchain-ai/langgraph/discussions/categories/q-a
+  - name: Feature Request
+    url: https://github.com/langchain-ai/langgraph/discussions/categories/ideas
+    about: Suggest a feature or an idea
+  - name: Show and tell
+    about: Show what you built with LangChain
+    url: https://github.com/langchain-ai/langgraph/discussions/categories/show-and-tell
+  - name: Slack
+    url:  https://www.langchain.com/join-community
+    about: General community discussions

.github/ISSUE_TEMPLATE/documentation.yml

@@ -0,0 +1,19 @@
+name: Documentation
+description: Report an issue related to the LangGraph documentation.
+title: "DOC: <Please write a comprehensive title after the 'DOC: ' prefix>"
+labels: [03 - Documentation]
+
+body:
+- type: textarea
+  attributes: 
+    label: "Issue with current documentation:"
+    description: >
+      Please make sure to leave a reference to the document/code you're
+      referring to.
+
+- type: textarea
+  attributes:
+    label: "Idea or request for content:"
+    description: >
+      Please describe as clearly as possible what topics you think are missing
+      from the current documentation.

.github/ISSUE_TEMPLATE/privileged.yml

@@ -1,28 +1,25 @@
-name: "\U0001F512 Privileged"
-description: You are a LangGraph maintainer. If not, check the other options.
+name: 🔒 Privileged
+description: You are a LangChain maintainer, or was asked directly by a maintainer to create an issue here. If not, check the other options.
 body:
   - type: markdown
     attributes:
       value: |
-        > **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
-
-        If you are not a LangGraph maintainer, employee, or were not asked directly by a maintainer to create an issue, then please start the conversation on the [LangChain Forum](https://forum.langchain.com/) instead.
-
-        **Note:** Do not begin work on a PR unless explicitly assigned to this issue by a maintainer.
+        Thanks for your interest in LangChain! 🚀
+        
+        If you are not a LangChain maintainer or were not asked directly by a maintainer to create an issue, then please start the conversation in a [Question in GitHub Discussions](https://github.com/langchain-ai/langchain/discussions/categories/q-a) instead.
+        
+        You are a LangChain maintainer if you maintain any of the packages inside of the LangChain repository 
+        or are a regular contributor to LangChain with previous merged merged pull requests.
   - type: checkboxes
     id: privileged
     attributes:
       label: Privileged issue
       description: Confirm that you are allowed to create an issue here.
       options:
-        - label: I am a LangGraph maintainer.
+        - label: I am a LangChain maintainer, or was asked directly by a LangChain maintainer to create an issue here.
           required: true
   - type: textarea
     id: content
     attributes:
       label: Issue Content
       description: Add the content of the issue here.
-  - type: markdown
-    attributes:
-      value: |
-        Please do not begin work on a PR unless explicitly assigned to this issue by a maintainer.

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,40 +0,0 @@
-Fixes #
-
-<!-- Replace everything above this line with a 1-2 sentence description of your change. Keep the "Fixes #xx" keyword and update the issue number. -->
-
-Read the full contributing guidelines: https://docs.langchain.com/oss/python/contributing/overview
-
-> **All contributions must be in English.** See the [language policy](https://docs.langchain.com/oss/python/contributing/overview#language-policy).
-
-If you paste a large clearly AI generated description here your PR may be IGNORED or CLOSED!
-
-Thank you for contributing to LangGraph! Follow these steps to have your pull request considered as ready for review.
-
-1. PR title: Should follow the format: TYPE(SCOPE): DESCRIPTION
-
-    - feat(langgraph): add multi-tenant support
-  - Allowed TYPE and SCOPE values: https://github.com/langchain-ai/langgraph/blob/main/.github/workflows/pr_lint.yml#L19-L43
-
-2. PR description:
-
-  - Write 1-2 sentences summarizing the change.
-  - The `Fixes #xx` line at the top is **required** for external contributions — update the issue number and keep the keyword. This links your PR to the approved issue and auto-closes it on merge.
-  - If there are any breaking changes, please clearly describe them.
-  - If this PR depends on another PR being merged first, please include "Depends on #PR_NUMBER" in the description.
-
-3. Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified.
-
-  - We will not consider a PR unless these three are passing in CI.
-
-4. How did you verify your code works?
-
-Additional guidelines:
-
-  - All external PRs must link to an issue or discussion where a solution has been approved by a maintainer, and you must be assigned to that issue. PRs without prior approval will be closed.
-  - PRs should not touch more than one package unless absolutely necessary.
-  - Do not update the `uv.lock` files or add dependencies to `pyproject.toml` files (even optional ones) unless you have explicit permission to do so by a maintainer.
-
-## Social handles (optional)
-<!-- If you'd like a shoutout on release, add your socials below -->
-Twitter: @
-LinkedIn: https://linkedin.com/in/

.github/THREAT_MODEL.md

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

.github/actions/poetry_setup/action.yml

@@ -0,0 +1,88 @@
+# An action for setting up poetry install with caching.
+# Using a custom action since the default action does not
+# take poetry install groups into account.
+# Action code from:
+# https://github.com/actions/setup-python/issues/505#issuecomment-1273013236
+name: poetry-install-with-caching
+description: Poetry install with support for caching of dependency groups.
+
+inputs:
+  python-version:
+    description: Python version, supporting MAJOR.MINOR only
+    required: true
+
+  poetry-version:
+    description: Poetry version
+    required: true
+
+  cache-key:
+    description: Cache key to use for manual handling of caching
+    required: true
+
+runs:
+  using: composite
+  steps:
+    - uses: actions/setup-python@v5
+      name: Setup python ${{ inputs.python-version }}
+      id: setup-python
+      with:
+        python-version: ${{ inputs.python-version }}
+
+    - uses: actions/cache@v3
+      id: cache-bin-poetry
+      name: Cache Poetry binary - Python ${{ inputs.python-version }}
+      env:
+        SEGMENT_DOWNLOAD_TIMEOUT_MIN: "1"
+      with:
+        path: |
+          /opt/pipx/venvs/poetry
+        # This step caches the poetry installation, so make sure it's keyed on the poetry version as well.
+        key: bin-poetry-${{ runner.os }}-${{ runner.arch }}-py-${{ inputs.python-version }}-${{ inputs.poetry-version }}
+
+    - name: Refresh shell hashtable and fixup softlinks
+      if: steps.cache-bin-poetry.outputs.cache-hit == 'true'
+      shell: bash
+      env:
+        POETRY_VERSION: ${{ inputs.poetry-version }}
+        PYTHON_VERSION: ${{ inputs.python-version }}
+      run: |
+        set -eux
+
+        # Refresh the shell hashtable, to ensure correct `which` output.
+        hash -r
+
+        # `actions/cache@v3` doesn't always seem able to correctly unpack softlinks.
+        # Delete and recreate the softlinks pipx expects to have.
+        rm /opt/pipx/venvs/poetry/bin/python
+        cd /opt/pipx/venvs/poetry/bin
+        ln -s "$(which "python$PYTHON_VERSION")" python
+        chmod +x python
+        cd /opt/pipx_bin/
+        ln -s /opt/pipx/venvs/poetry/bin/poetry poetry
+        chmod +x poetry
+
+        # Ensure everything got set up correctly.
+        /opt/pipx/venvs/poetry/bin/python --version
+        /opt/pipx_bin/poetry --version
+
+    - name: Install poetry
+      if: steps.cache-bin-poetry.outputs.cache-hit != 'true'
+      shell: bash
+      env:
+        POETRY_VERSION: ${{ inputs.poetry-version }}
+        PYTHON_VERSION: ${{ inputs.python-version }}
+      # Install poetry using the python version installed by setup-python step.
+      run: pipx install "poetry==$POETRY_VERSION" --python '${{ steps.setup-python.outputs.python-path }}' --verbose
+
+    - name: Restore pip and poetry cached dependencies
+      uses: actions/cache@v3
+      env:
+        SEGMENT_DOWNLOAD_TIMEOUT_MIN: "4"
+      with:
+        path: |
+          ~/.cache/pip
+          ~/.cache/pypoetry/virtualenvs
+          ~/.cache/pypoetry/cache
+          ~/.cache/pypoetry/artifacts
+          ./.venv
+        key: py-deps-${{ runner.os }}-${{ runner.arch }}-py-${{ inputs.python-version }}-poetry-${{ inputs.poetry-version }}-${{ inputs.cache-key }}-${{ hashFiles('./poetry.lock') }}

.github/actions/uv_setup/action.yml

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

.github/dependabot.yml

@@ -1,188 +0,0 @@
-version: 2
-updates:
-  - package-ecosystem: "github-actions"
-    directory: "/"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/checkpoint"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/checkpoint-conformance"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/checkpoint-postgres"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/checkpoint-sqlite"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/cli"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/langgraph"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/prebuilt"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "uv"
-    directory: "/libs/sdk-py"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "npm"
-    directory: "/libs/cli/js-examples"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"
-
-  - package-ecosystem: "npm"
-    directory: "/libs/cli/js-monorepo-example"
-    schedule:
-      interval: "monthly"
-    groups:
-      minor-and-patch:
-        patterns:
-          - "*"
-        update-types:
-          - "minor"
-          - "patch"
-      major:
-        patterns:
-          - "*"
-        update-types:
-          - "major"

.github/images/logo-dark.svg

@@ -1,5 +0,0 @@
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.github/scripts/check_sdk_methods.py

@@ -1,15 +1,10 @@
 import ast
 import os
 from itertools import filterfalse
-from typing import Dict, List, Tuple
+from typing import List, Tuple
 
 ROOT_PATH = os.path.abspath(os.path.join(__file__, "..", "..", ".."))
 CLIENT_PATH = os.path.join(ROOT_PATH, "libs", "sdk-py", "langgraph_sdk", "client.py")
-ASYNC_TO_SYNC_METHOD_MAP: Dict[str, str] = {
-    "aclose": "close",
-    "__aenter__": "__enter__",
-    "__aexit__": "__exit__",
-}
 
 
 def get_class_methods(node: ast.ClassDef) -> List[str]:
@@ -27,7 +22,7 @@ def find_classes(tree: ast.AST) -> List[Tuple[str, List[str]]]:
 
 def compare_sync_async_methods(sync_methods: List[str], async_methods: List[str]) -> List[str]:
     sync_set = set(sync_methods)
-    async_set = {ASYNC_TO_SYNC_METHOD_MAP.get(async_method, async_method) for async_method in async_methods}
+    async_set = set(async_methods)
     missing_in_sync = list(async_set - sync_set)
     missing_in_async = list(sync_set - async_set)
     return missing_in_sync + missing_in_async
@@ -38,7 +33,7 @@ def main():
         tree = ast.parse(file.read())
 
     classes = find_classes(tree)
-
+  
     def is_sync(class_spec: Tuple[str, List[str]]) -> bool:
         return class_spec[0].startswith("Sync")
 

.github/scripts/run_langgraph_cli_test.py

@@ -1,164 +1,108 @@
-import logging
+import asyncio
+import json
+import os
 import pathlib
 import sys
-import time
-from urllib import error, request
-
 import langgraph_cli
-import langgraph_cli.config
 import langgraph_cli.docker
-from langgraph_cli.cli import prepare_args_and_stdin
-from langgraph_cli.constants import DEFAULT_PORT
+import langgraph_cli.config
+
 from langgraph_cli.exec import Runner, subp_exec
 from langgraph_cli.progress import Progress
-
-logger = logging.getLogger(__name__)
-logging.basicConfig(level=logging.INFO)
+from langgraph_cli.constants import DEFAULT_PORT
 
 
-def test(config: pathlib.Path, port: int, tag: str, verbose: bool):
-    """Spin up API with Postgres/Redis via docker compose and wait until ready."""
-    logger.info("Starting test...")
+def test(
+    config: pathlib.Path,
+    port: int,
+    tag: str,
+    verbose: bool,
+):
     with Runner() as runner, Progress(message="Pulling...") as set:
-        # Detect docker/compose capabilities
+        # check docker available
         capabilities = langgraph_cli.docker.check_capabilities(runner)
-
-        # Validate config and prepare compose stdin/args using built image
+        # open config
         config_json = langgraph_cli.config.validate_config_file(config)
-        args, stdin = prepare_args_and_stdin(
-            capabilities=capabilities,
-            config_path=config,
-            config=config_json,
-            docker_compose=None,
-            port=port,
-            watch=False,
-            debugger_port=None,
-            debugger_base_url=f"http://127.0.0.1:{port}",
-            postgres_uri=None,
-            api_version=None,
-            image=tag,
-            base_image=None,
-        )
 
-        # Compose up with wait (implies detach), similar to `langgraph up --wait`
-        args_up = [*args, "up", "--remove-orphans", "--wait"]
-
-        compose_cmd = ["docker", "compose"]
-        if capabilities.compose_type == "standalone":
-            compose_cmd = ["docker-compose"]
-
-        set("Starting...")
-        try:
-            runner.run(
-                subp_exec(
-                    *compose_cmd,
-                    *args_up,
-                    input=stdin,
-                    verbose=verbose,
-                )
+        set("Running...")
+        args = [
+            "run",
+            "--rm",
+            "-p",
+            f"{port}:8000",
+        ]
+        if isinstance(config_json["env"], str):
+            args.extend(
+                [
+                    "--env-file",
+                    str(config.parent / config_json["env"]),
+                ]
             )
-        except Exception as e:  # noqa: BLE001
-            # On failure, show diagnostics then ensure clean teardown
-            sys.stderr.write(f"docker compose up failed: {e}\n")
-            try:
-                sys.stderr.write("\n== docker compose ps ==\n")
-                runner.run(
-                    subp_exec(*compose_cmd, *args, "ps", input=stdin, verbose=True)
-                )
-            except Exception:
-                pass
-            try:
-                sys.stderr.write("\n== docker compose logs (api) ==\n")
-                runner.run(
-                    subp_exec(
-                        *compose_cmd,
-                        *args,
-                        "logs",
-                        "langgraph-api",
-                        input=stdin,
-                        verbose=True,
-                    )
-                )
-            except Exception:
-                pass
-            finally:
-                try:
-                    runner.run(
-                        subp_exec(
-                            *compose_cmd,
-                            *args,
-                            "down",
-                            "-v",
-                            "--remove-orphans",
-                            input=stdin,
-                            verbose=False,
-                        )
-                    )
-                finally:
-                    raise
-
-        set("")
-        base_url = f"http://localhost:{port}"
-        ok_url = f"{base_url}/ok"
-        logger.info(f"Waiting for {ok_url} to respond with 200...")
-        deadline = time.time() + 30
-        last_err: Exception | None = None
-        while time.time() < deadline:
-            try:
-                with request.urlopen(ok_url, timeout=2) as resp:
-                    if resp.status == 200:
-                        sys.stdout.write(
-                            f"""Ready!\n- API: {base_url}\n- /ok: 200 OK\n"""
-                        )
-                        sys.stdout.flush()
-                        break
-                    else:
-                        last_err = RuntimeError(f"Unexpected status: {resp.status}")
-                        logger.error(f"Unexpected status: {resp.status}")
-            except error.URLError as e:
-                logger.error(f"URLError: {e}")
-                last_err = e
-            except Exception as e:  # noqa: BLE001
-                logger.error(f"Exception: {e}")
-                last_err = e
-            time.sleep(0.5)
         else:
-            logger.error("Timeout waiting for /ok to return 200")
-            # Bring stack down before raising
-            args_down = [*args, "down", "-v", "--remove-orphans"]
-            try:
-                runner.run(
-                    subp_exec(
-                        *compose_cmd,
-                        *args_down,
-                        input=stdin,
-                        verbose=verbose,
-                    )
-                )
-            finally:
-                raise SystemExit(
-                    f"/ok did not return 202 within timeout. Last error: {last_err}"
+            for k, v in config_json["env"].items():
+                args.extend(
+                    [
+                        "-e",
+                        f"{k}={v}",
+                    ]
                 )
+        if capabilities.healthcheck_start_interval:
+            args.extend(
+                [
+                    "--health-interval",
+                    "5s",
+                    "--health-retries",
+                    "1",
+                    "--health-start-period",
+                    "10s",
+                    "--health-start-interval",
+                    "1s",
+                ]
+            )
+        else:
+            args.extend(
+                [
+                    "--health-interval",
+                    "5s",
+                    "--health-retries",
+                    "2",
+                ]
+            )
+
+        _task = None
+
+        def on_stdout(line: str):
+            nonlocal _task
+            if "GET /ok" in line or "Uvicorn running on" in line:
+                set("")
+                sys.stdout.write(
+                    f"""Ready!
+- API: http://localhost:{port}
+"""
+                )
+                sys.stdout.flush()
+                _task.cancel()
+                return True
+            return False
+
+        async def subp_exec_task(*args, **kwargs):
+            nonlocal _task
+            _task = asyncio.create_task(subp_exec(*args, **kwargs))
+            await _task
 
-        # Clean up: bring compose stack down to free ports for next test
-        logger.info("Test succeeded. Bringing down compose stack...")
         try:
-            args_down = [*args, "down", "-v", "--remove-orphans"]
             runner.run(
-                subp_exec(
-                    *compose_cmd,
-                    *args_down,
-                    input=stdin,
+                subp_exec_task(
+                    "docker",
+                    *args,
+                    tag,
                     verbose=verbose,
+                    on_stdout=on_stdout,
                 )
             )
-            logger.info("Compose stack down. Finishing...")
-        except Exception:
-            logger.exception("Failed to bring down compose stack")
+        except asyncio.CancelledError:
             pass
 
-    logger.info("Test finished")
-
 
 if __name__ == "__main__":
     import argparse
@@ -166,12 +110,6 @@ if __name__ == "__main__":
     parser = argparse.ArgumentParser()
     parser.add_argument("-t", "--tag", type=str)
     parser.add_argument("-c", "--config", type=str, default="./langgraph.json")
-    parser.add_argument("-p", "--port", type=int, default=DEFAULT_PORT)
+    parser.add_argument("-p", "--port", default=DEFAULT_PORT)
     args = parser.parse_args()
-    try:
-        test(pathlib.Path(args.config), args.port, args.tag, verbose=True)
-    except BaseException:
-        logger.exception("Test failed")
-        raise
-    
-    logger.info("Test execution finished")
+    test(pathlib.Path(args.config), args.port, args.tag, verbose=True)

.github/workflows/_integration_test.yml

@@ -2,12 +2,9 @@ name: CLI integration test
 
 on:
   workflow_call:
-    secrets:
-      LANGSMITH_API_KEY:
-        required: false
 
-permissions:
-  contents: read
+env:
+  POETRY_VERSION: "1.7.1"
 
 jobs:
   build:
@@ -16,153 +13,62 @@ jobs:
       matrix:
         python-version:
           - "3.10"
-          - "3.14"
-        example:
-          - name: A
-            workdir: libs/cli/examples
-            tag: langgraph-test-a
-          - name: B
-            workdir: libs/cli/examples/graphs
-            tag: langgraph-test-b
-          - name: C
-            workdir: libs/cli/examples/graphs_reqs_a
-            tag: langgraph-test-c
-          - name: D
-            workdir: libs/cli/examples/graphs_reqs_b
-            tag: langgraph-test-d
+          - "3.11"
     name: "CLI integration test"
-    env:
-      HAS_LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY != '' }}
     defaults:
       run:
         working-directory: libs/cli
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
       - name: Get changed files
         id: changed-files
-        if: github.event_name != 'workflow_dispatch'
-        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
+        uses: Ana06/get-changed-files@v2.3.0
         with:
           filter: "libs/cli/**"
-      - name: Set up Python ${{ matrix.python-version }}
-        if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python ${{ matrix.python-version }} + Poetry ${{ env.POETRY_VERSION }}
+        if: steps.changed-files.outputs.all
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ matrix.python-version }}
-          enable-cache: "false"
-          working-directory: libs/cli
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: integration-test-cli
+      - name: Setup env
+        if: steps.changed-files.outputs.all
+        working-directory: libs/cli/examples
+        run: cat .env.example > .env
       - name: Install cli globally
-        if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
+        if: steps.changed-files.outputs.all
         run: pip install -e .
-      - name: Build service ${{ matrix.example.name }}
-        if: (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch')
-        working-directory: ${{ matrix.example.workdir }}
+      - name: Build and test service A
+        if: steps.changed-files.outputs.all
+        working-directory: libs/cli/examples
         run: |
-          langgraph build -t ${{ matrix.example.tag }}
-      - name: Test service ${{ matrix.example.name }}
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&env.HAS_LANGSMITH_API_KEY == 'true' }}
-        working-directory: ${{ matrix.example.workdir }}
-        env:
-          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
+          # The build-arg isn't used; just testing that we accept other args
+          langgraph build -t langgraph-test-a  --base-image "langchain/langgraph-trial"
+          cp .env.example .envg
+          timeout 60 python ../../../.github/scripts/run_langgraph_cli_test.py -c langgraph.json -t langgraph-test-a
+      - name: Build and test service B
+        if: steps.changed-files.outputs.all
+        working-directory: libs/cli/examples/graphs
         run: |
-          # Prepare environment file from local or parent example directory
-          if [ -f .env.example ]; then cp .env.example .env; elif [ -f ../.env.example ]; then cp ../.env.example .env && cp ../.env.example ../.env; fi
-          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
-          if [ -f ../.env ]; then echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> ../.env; fi
-          # Run the integration test using the built tag
-          REPO_ROOT=$(git rev-parse --show-toplevel)
-          timeout 60 python "$REPO_ROOT/.github/scripts/run_langgraph_cli_test.py" -t ${{ matrix.example.tag }}
+          langgraph build -t langgraph-test-b  --base-image "langchain/langgraph-trial"
+          timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-b
+      - name: Build and test service C
+        if: steps.changed-files.outputs.all
+        working-directory: libs/cli/examples/graphs_reqs_a
+        run: |
+          langgraph build -t langgraph-test-c  --base-image "langchain/langgraph-trial"
+          timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-c
+      - name: Build and test service D
+        if: steps.changed-files.outputs.all
+        working-directory: libs/cli/examples/graphs_reqs_b
+        run: |
+          langgraph build -t langgraph-test-d  --base-image "langchain/langgraph-trial"
+          timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-d
 
       - name: Build JS service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
+        if: steps.changed-files.outputs.all
         working-directory: libs/cli/js-examples
         run: |
           langgraph build -t langgraph-test-e
-
-      - name: Build JS monorepo service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
-        working-directory: libs/cli/js-monorepo-example
-        run: |
-          langgraph build -t langgraph-test-f -c apps/agent/langgraph.json --build-command "yarn run turbo build" --install-command "yarn install"
-
-      - name: Build Python monorepo service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
-        working-directory: libs/cli/python-monorepo-example
-        run: |
-          langgraph build -t langgraph-test-g -c apps/agent/langgraph.json
-      - name: Test Python monorepo service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' && env.HAS_LANGSMITH_API_KEY == 'true' }}
-        working-directory: libs/cli/python-monorepo-example
-        env:
-          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-        run: |
-          cp apps/agent/.env.example apps/agent/.env
-          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> apps/agent/.env
-          timeout 60 python ../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-g -c apps/agent/langgraph.json
-
-      - name: Build prerelease reqs service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
-        working-directory: libs/cli/examples/graph_prerelease_reqs
-        run: |
-          langgraph build -t langgraph-test-h
-      - name: Test prerelease reqs service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' && env.HAS_LANGSMITH_API_KEY == 'true' }}
-        working-directory: libs/cli/examples/graph_prerelease_reqs
-        env:
-          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-        run: |
-          cp ../.env.example .env
-          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
-          timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-h
-          echo "Finished starting up langgraph-test-h"
-          LANGGRAPH_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langgraph'); print(v);")
-          if [ "$LANGGRAPH_VERSION" != "1.1.5" ]; then
-            echo "LANGGRAPH_VERSION != 1.1.5; $LANGGRAPH_VERSION"
-            exit 1
-          fi
-          LANGCHAIN_OPENAI_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-openai'); print(v);")
-          if [ "$LANGCHAIN_OPENAI_VERSION" != "1.1.14" ]; then
-            echo "LANGCHAIN_OPENAI_VERSION != 1.1.14; $LANGCHAIN_OPENAI_VERSION"
-            exit 1
-          fi
-          LANGCHAIN_ANTHROPIC_VERSION=$(docker run --rm --entrypoint "" langgraph-test-h python -c "import sys; from importlib.metadata import version; v = version('langchain-anthropic'); print(v);")
-          if [ "$LANGCHAIN_ANTHROPIC_VERSION" != "1.4.6" ]; then
-            echo "LANGCHAIN_ANTHROPIC_VERSION != 1.4.6; $LANGCHAIN_ANTHROPIC_VERSION"
-            exit 1
-          fi
-
-      - name: Build and test prerelease reqs fail service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
-        working-directory: libs/cli/examples/graph_prerelease_reqs_fail
-        run: |
-          langgraph build -t langgraph-test-i || [ $? -eq 1 ]
-
-      - name: Build uv simple service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
-        working-directory: libs/cli/uv-examples/simple
-        run: |
-          langgraph build -t langgraph-test-uv-simple
-      - name: Test uv simple service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' && env.HAS_LANGSMITH_API_KEY == 'true' }}
-        working-directory: libs/cli/uv-examples/simple
-        env:
-          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-        run: |
-          cp .env.example .env
-          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
-          timeout 60 python ../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-uv-simple
-
-      - name: Build uv monorepo service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' }}
-        working-directory: libs/cli/uv-examples/monorepo/apps/agent
-        run: |
-          langgraph build -t langgraph-test-uv-monorepo
-      - name: Test uv monorepo service
-        if: ${{ (steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch') &&matrix.example.name == 'A' && env.HAS_LANGSMITH_API_KEY == 'true' }}
-        working-directory: libs/cli/uv-examples/monorepo/apps/agent
-        env:
-          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
-        run: |
-          cp .env.example .env
-          echo "LANGSMITH_API_KEY=${{ secrets.LANGSMITH_API_KEY }}" >> .env
-          timeout 60 python ../../../../../../.github/scripts/run_langgraph_cli_test.py -t langgraph-test-uv-monorepo
+  

.github/workflows/_lint.yml

@@ -8,10 +8,9 @@ on:
         type: string
         description: "From which folder this pipeline executes"
 
-permissions:
-  contents: read
-
 env:
+  POETRY_VERSION: "1.7.1"
+
   # This env var allows us to get inline annotations when ruff has complaints.
   RUFF_OUTPUT_FORMAT: github
 
@@ -31,28 +30,57 @@ jobs:
           - "3.12"
     name: "lint #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
       - name: Get changed files
         id: changed-files
-        if: github.event_name != 'workflow_dispatch'
-        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
+        uses: Ana06/get-changed-files@v2.3.0
         with:
           filter: "${{ inputs.working-directory }}/**"
-      - name: Set up Python ${{ matrix.python-version }}
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python ${{ matrix.python-version }} + Poetry ${{ env.POETRY_VERSION }}
+        if: steps.changed-files.outputs.all
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ matrix.python-version }}
-          cache-suffix: lint-${{ inputs.working-directory }}
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: lint-${{ inputs.working-directory }}
+
+      - name: Check Poetry File
+        if: steps.changed-files.outputs.all
+        shell: bash
+        working-directory: ${{ inputs.working-directory }}
+        run: poetry check
+
+      - name: Check lock file
+        if: steps.changed-files.outputs.all
+        shell: bash
+        working-directory: ${{ inputs.working-directory }}
+        run: poetry lock --check
 
       - name: Install dependencies
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
+        if: steps.changed-files.outputs.all
+        # Also installs dev/lint/test/typing dependencies, to ensure we have
+        # type hints for as many of our libraries as possible.
+        # This helps catch errors that require dependencies to be spotted, for example:
+        # https://github.com/langchain-ai/langchain/pull/10249/files#diff-935185cd488d015f026dcd9e19616ff62863e8cde8c0bee70318d3ccbca98341
+        #
+        # If you change this configuration, make sure to change the `cache-key`
+        # in the `poetry_setup` action above to stop using the old cache.
+        # It doesn't matter how you change it, any change will cause a cache-bust.
         working-directory: ${{ inputs.working-directory }}
-        run: uv sync --frozen --group lint
+        run: poetry install --with dev
+
+      - name: Get .mypy_cache to speed up mypy
+        if: steps.changed-files.outputs.all
+        uses: actions/cache@v3
+        env:
+          SEGMENT_DOWNLOAD_TIMEOUT_MIN: "2"
+        with:
+          path: |
+            ${{ inputs.working-directory }}/.mypy_cache
+          key: mypy-lint-${{ runner.os }}-${{ runner.arch }}-py${{ matrix.python-version }}-${{ inputs.working-directory }}-${{ hashFiles(format('{0}/poetry.lock', inputs.working-directory)) }}
 
       - name: Analysing package code with our lint
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
+        if: steps.changed-files.outputs.all
         working-directory: ${{ inputs.working-directory }}
         run: |
           if make lint_package > /dev/null 2>&1; then
@@ -63,12 +91,31 @@ jobs:
           fi
 
       - name: Install test dependencies
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
+        if: steps.changed-files.outputs.all
+        # Also installs dev/lint/test/typing dependencies, to ensure we have
+        # type hints for as many of our libraries as possible.
+        # This helps catch errors that require dependencies to be spotted, for example:
+        # https://github.com/langchain-ai/langchain/pull/10249/files#diff-935185cd488d015f026dcd9e19616ff62863e8cde8c0bee70318d3ccbca98341
+        #
+        # If you change this configuration, make sure to change the `cache-key`
+        # in the `poetry_setup` action above to stop using the old cache.
+        # It doesn't matter how you change it, any change will cause a cache-bust.
         working-directory: ${{ inputs.working-directory }}
-        run: uv sync --group lint
+        run: |
+          poetry install --with dev
+
+      - name: Get .mypy_cache_test to speed up mypy
+        if: steps.changed-files.outputs.all
+        uses: actions/cache@v3
+        env:
+          SEGMENT_DOWNLOAD_TIMEOUT_MIN: "2"
+        with:
+          path: |
+            ${{ inputs.working-directory }}/.mypy_cache_test
+          key: mypy-test-${{ runner.os }}-${{ runner.arch }}-py${{ matrix.python-version }}-${{ inputs.working-directory }}-${{ hashFiles(format('{0}/poetry.lock', inputs.working-directory)) }}
 
       - name: Analysing tests with our lint
-        if: steps.changed-files.outputs.all || github.event_name == 'workflow_dispatch'
+        if: steps.changed-files.outputs.all
         working-directory: ${{ inputs.working-directory }}
         run: |
           if make lint_tests > /dev/null 2>&1; then

.github/workflows/_sdk_integration_test.yml

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

.github/workflows/_test.yml

@@ -8,8 +8,8 @@ on:
         type: string
         description: "From which folder this pipeline executes"
 
-permissions:
-  contents: read
+env:
+  POETRY_VERSION: "1.7.1"
 
 jobs:
   build:
@@ -17,23 +17,23 @@ jobs:
     strategy:
       matrix:
         python-version:
+          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
-          - "3.14"
 
     name: "test #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: ./.github/actions/uv_setup
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }} + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ matrix.python-version }}
-          cache-suffix: test-${{ inputs.working-directory }}
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: test-${{ inputs.working-directory }}
       - name: Login to Docker Hub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        uses: docker/login-action@v3
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -42,12 +42,14 @@ jobs:
       - name: Install dependencies
         shell: bash
         working-directory: ${{ inputs.working-directory }}
-        run: uv sync --frozen --group test --no-dev
+        run: |
+          poetry install --with dev
 
       - name: Run tests
         shell: bash
         working-directory: ${{ inputs.working-directory }}
-        run: make test
+        run: |
+          make test
 
       - name: Ensure the tests did not create any additional files
         shell: bash

.github/workflows/_test_langgraph.yml

@@ -3,8 +3,8 @@ name: test
 on:
   workflow_call:
 
-permissions:
-  contents: read
+env:
+  POETRY_VERSION: "1.7.1"
 
 jobs:
   build:
@@ -12,26 +12,26 @@ jobs:
     strategy:
       matrix:
         python-version:
+          - "3.9"
           - "3.10"
           - "3.11"
           - "3.12"
           - "3.13"
-          - "3.14"
 
     defaults:
       run:
         working-directory: libs/langgraph
     name: "test #${{ matrix.python-version }}"
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: ./.github/actions/uv_setup
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }} + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ matrix.python-version }}
-          cache-suffix: "test-langgraph"
-          working-directory: libs/langgraph
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: test-langgraph
       - name: Login to Docker Hub
-        uses: docker/login-action@dbcb813823bdd20940b903addbd779551569679f # v4
+        uses: docker/login-action@v3
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
@@ -39,18 +39,13 @@ jobs:
 
       - name: Install dependencies
         shell: bash
-        run: uv sync --frozen --group test --no-dev
+        run: |
+          poetry install --with dev
 
       - name: Run tests
         shell: bash
-        run: make test_parallel
-
-      - name: Run strict msgpack pregel tests
-        if: ${{ matrix.python-version == '3.13' }}
-        shell: bash
-        env:
-          LANGGRAPH_STRICT_MSGPACK: "true"
-        run: make test TEST="tests/test_pregel.py tests/test_pregel_async.py"
+        run: |
+          make test_parallel
 
       - name: Ensure the tests did not create any additional files
         shell: bash

.github/workflows/_test_release.yml

@@ -9,13 +9,12 @@ on:
         description: "From which folder this pipeline executes"
 
 env:
+  POETRY_VERSION: "1.7.1"
   PYTHON_VERSION: "3.10"
 
-permissions:
-  contents: read
-
 jobs:
   build:
+    if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
 
     outputs:
@@ -23,14 +22,14 @@ jobs:
       version: ${{ steps.check-version.outputs.version }}
 
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
 
-      - name: Set up Python ${{ env.PYTHON_VERSION }}
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          cache-suffix: "release"
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: release
 
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
@@ -44,11 +43,11 @@ jobs:
       # > from the publish job.
       # https://github.com/pypa/gh-action-pypi-publish#non-goals
       - name: Build project for distribution
-        run: uv build
+        run: poetry build
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        uses: actions/upload-artifact@v4
         with:
           name: test-dist
           path: ${{ inputs.working-directory }}/dist/
@@ -58,8 +57,8 @@ jobs:
         shell: bash
         working-directory: ${{ inputs.working-directory }}
         run: |
-          echo pkg-name=$(grep -m 1 "^name = " pyproject.toml | cut -d '"' -f 2)
-          echo version=$(grep -m 1 "^version = " pyproject.toml | cut -d '"' -f 2)
+          echo pkg-name="$(poetry version | cut -d ' ' -f 1)" >> $GITHUB_OUTPUT
+          echo version="$(poetry version --short)" >> $GITHUB_OUTPUT
 
   publish:
     needs:
@@ -74,15 +73,15 @@ jobs:
       id-token: write
 
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
 
-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+      - uses: actions/download-artifact@v4
         with:
           name: test-dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish to test PyPI
-        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
+        uses: pypa/gh-action-pypi-publish@release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true

.github/workflows/_test_scheduler_kafka.yml

@@ -0,0 +1,57 @@
+name: test
+
+on:
+  workflow_call:
+
+env:
+  POETRY_VERSION: "1.7.1"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version:
+          - "3.11"
+          - "3.12"
+
+    defaults:
+      run:
+        working-directory: libs/scheduler-kafka
+    name: "test #${{ matrix.python-version }}"
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python ${{ matrix.python-version }} + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
+        with:
+          python-version: ${{ matrix.python-version }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: test-scheduler-kafka
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        if: ${{ !github.event.pull_request.head.repo.fork }}
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_RO_TOKEN }}
+
+      - name: Install dependencies
+        shell: bash
+        run: |
+          poetry install --with dev
+
+      - name: Run tests
+        shell: bash
+        run: |
+          make test
+
+      - name: Ensure the tests did not create any additional files
+        shell: bash
+        run: |
+          set -eu
+
+          STATUS="$(git status)"
+          echo "$STATUS"
+
+          # grep will exit non-zero if the target message isn't found,
+          # and `set -e` above will cause the step to fail.
+          echo "$STATUS" | grep 'nothing to commit, working tree clean'

.github/workflows/baseline.yml

@@ -7,8 +7,8 @@ on:
     paths:
       - "libs/**"
 
-permissions:
-  contents: read
+env:
+  POETRY_VERSION: "1.7.1"
 
 jobs:
   benchmark:
@@ -17,20 +17,20 @@ jobs:
       run:
         working-directory: libs/langgraph
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
       - run: SHA=$(git rev-parse HEAD) && echo "SHA=$SHA" >> $GITHUB_ENV
-      - name: Set up Python 3.11
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python 3.11 + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: "3.11"
-          cache-suffix: "bench"
-          working-directory: libs/langgraph
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: bench
       - name: Install dependencies
-        run: uv sync --group test
+        run: poetry install --with dev
       - name: Run benchmarks
         run: OUTPUT=out/benchmark-baseline.json make -s benchmark
       - name: Save outputs
-        uses: actions/cache/save@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        uses: actions/cache/save@v4
         with:
           key: ${{ runner.os }}-benchmark-baseline-${{ env.SHA }}
           path: |

.github/workflows/bench.yml

@@ -5,8 +5,8 @@ on:
     paths:
       - "libs/**"
 
-permissions:
-  contents: read
+env:
+  POETRY_VERSION: "1.7.1"
 
 jobs:
   benchmark:
@@ -15,22 +15,22 @@ jobs:
       run:
         working-directory: libs/langgraph
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
       - id: files
         name: Get changed files
-        uses: Ana06/get-changed-files@25f79e676e7ea1868813e21465014798211fad8c # v2.3.0
+        uses: Ana06/get-changed-files@v2.3.0
         with:
           format: json
-      - name: Set up Python 3.11
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python 3.11 + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: "3.11"
-          cache-suffix: "bench"
-          working-directory: libs/langgraph
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: bench
       - name: Install dependencies
-        run: uv sync --group test
+        run: poetry install --with dev
       - name: Download baseline
-        uses: actions/cache/restore@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
+        uses: actions/cache/restore@v4
         with:
           key: ${{ runner.os }}-benchmark-baseline
           restore-keys: |
@@ -43,7 +43,7 @@ jobs:
         run: |
           {
             echo 'OUTPUT<<EOF'
-            make -s benchmark-fast
+            make -s benchmark
             echo EOF
           } >> "$GITHUB_OUTPUT"
       - name: Compare benchmarks
@@ -53,23 +53,19 @@ jobs:
             echo 'OUTPUT<<EOF'
             mv out/benchmark-baseline.json out/main.json
             mv out/benchmark.json out/changes.json
-            uv run pyperf compare_to out/main.json out/changes.json --table --group-by-speed
+            poetry run pyperf compare_to out/main.json out/changes.json --table --group-by-speed
             echo EOF
           } >> "$GITHUB_OUTPUT"
       - name: Annotation
-        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
-        env:
-          CHANGED_FILES: ${{ steps.files.outputs.added_modified_renamed }}
-          BENCHMARK_OUTPUT: ${{ steps.benchmark.outputs.OUTPUT }}
-          COMPARE_OUTPUT: ${{ steps.compare.outputs.OUTPUT }}
+        uses: actions/github-script@v7
         with:
           script: |
-            const file = JSON.parse(process.env.CHANGED_FILES || "[]")[0]
-            core.notice(process.env.BENCHMARK_OUTPUT || "", {
+            const file = JSON.parse(`${{ steps.files.outputs.added_modified_renamed }}`)[0]
+            core.notice(`${{ steps.benchmark.outputs.OUTPUT }}`, {
               title: 'Benchmark results',
               file,
             })
-            core.notice(process.env.COMPARE_OUTPUT || "", {
+            core.notice(`${{ steps.compare.outputs.OUTPUT }}`, {
               title: 'Comparison against main',
               file,
             })

.github/workflows/ci.yml

@@ -2,15 +2,9 @@
 name: CI
 
 on:
-  workflow_dispatch:
   push:
-    branches:
-      - main
+    branches: [main]
   pull_request:
-  
-
-permissions:
-  contents: read
 
 # If another push to the same PR or branch happens while this workflow is still running,
 # cancel the earlier run in favor of the next run.
@@ -22,17 +16,18 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+env:
+  POETRY_VERSION: "1.7.1"
+
 jobs:
   changes:
     runs-on: ubuntu-latest
     outputs:
-      python: ${{ steps.filter.outputs.python || 'true' }}
-      deps: ${{ steps.filter.outputs.deps || 'true' }}
-      sdk_py: ${{ steps.filter.outputs.sdk_py || 'true' }}
+      python: ${{ steps.filter.outputs.python }}
+      sdk-js: ${{ steps.filter.outputs.sdk-js }}
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - uses: dorny/paths-filter@7b450fff21473bca461d4b92ce414b9d0420d706 # v4
-        if: github.event_name != 'workflow_dispatch'
+      - uses: actions/checkout@v4
+      - uses: dorny/paths-filter@v3
         id: filter
         with:
           filters: |
@@ -43,17 +38,10 @@ jobs:
               - 'libs/checkpoint/**'
               - 'libs/checkpoint-sqlite/**'
               - 'libs/checkpoint-postgres/**'
-              - 'libs/checkpoint-conformance/**'
+              - 'libs/scheduler-kafka/**'
               - 'libs/prebuilt/**'
-            deps:
-              - '**/pyproject.toml'
-              - '**/uv.lock'
-            sdk_py:
-              - 'libs/sdk-py/**'
-              # The integration suite runs the local langgraph core inside the
-              # server (see libs/sdk-py/integration/Dockerfile), so any core
-              # change is now exercised end-to-end and should trigger it.
-              - 'libs/langgraph/**'
+            sdk-js:
+              - 'libs/sdk-js/**'
 
   lint:
     needs: changes
@@ -68,10 +56,10 @@ jobs:
             "libs/checkpoint",
             "libs/checkpoint-sqlite",
             "libs/checkpoint-postgres",
-            "libs/checkpoint-conformance",
+            "libs/scheduler-kafka",
             "libs/prebuilt",
           ]
-    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
+    if: needs.changes.outputs.python == 'true'
     uses: ./.github/workflows/_lint.yml
     with:
       working-directory: ${{ matrix.working-directory }}
@@ -88,11 +76,9 @@ jobs:
             "libs/checkpoint",
             "libs/checkpoint-sqlite",
             "libs/checkpoint-postgres",
-            "libs/checkpoint-conformance",
             "libs/prebuilt",
-            "libs/sdk-py",
           ]
-    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
+    if: needs.changes.outputs.python == 'true'
     uses: ./.github/workflows/_test.yml
     with:
       working-directory: ${{ matrix.working-directory }}
@@ -101,86 +87,101 @@ jobs:
   # NOTE: we're testing langgraph separately because it requires a different matrix
   test-langgraph:
     needs: changes
-    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
+    if: needs.changes.outputs.python == 'true'
     name: "cd libs/langgraph"
     uses: ./.github/workflows/_test_langgraph.yml
     secrets: inherit
 
+  # NOTE: we're testing scheduler-kafka separately because it requires a different matrix
+  test-scheduler-kafka:
+    needs: changes
+    if: needs.changes.outputs.python == 'true'
+    name: "cd libs/scheduler-kafka"
+    uses: ./.github/workflows/_test_scheduler_kafka.yml
+    secrets: inherit
+
   check-sdk-methods:
     needs: changes
     if: needs.changes.outputs.python == 'true'
     name: "Check SDK methods matching"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
       - name: Set up Python
-        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
+        uses: actions/setup-python@v5
         with:
           python-version: "3.11"
       - name: Run check_sdk_methods script
         run: python .github/scripts/check_sdk_methods.py
 
-  check-schema:
-    needs: changes
-    if: needs.changes.outputs.python == 'true'
-    name: "Check CLI schema hasn't changed #${{ matrix.python-version }}"
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        python-version:
-          - "3.13"
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      - name: Set up Python ${{ matrix.python-version }}
-        uses: ./.github/actions/uv_setup
-        with:
-          python-version: "3.13"
-          cache-suffix: "schema-check-cli"
-          working-directory: libs/cli
-      - name: Install CLI dependencies
-        run: |
-          cd libs/cli
-          uv sync
-      - name: Generate schema and check for changes
-        run: |
-          cd libs/cli
-          # Create a temporary copy of the current schema
-          cp schemas/schema.json schemas/schema.current.json
-          # Generate new schema
-          uv run python generate_schema.py
-          # Compare the new schema with the original
-          if ! diff -q schemas/schema.json schemas/schema.current.json > /dev/null; then
-            echo "Error: Langgraph.json configuration schema has changed. Please run 'uv run python generate_schema.py' in the libs/cli directory and commit the changes."
-            diff schemas/schema.json schemas/schema.current.json
-            exit 1
-          fi
-          echo "Schema check passed - no changes detected"
-
   integration-test:
     needs: changes
-    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
+    if: needs.changes.outputs.python == 'true'
     name: CLI integration test
     uses: ./.github/workflows/_integration_test.yml
     secrets: inherit
 
-  sdk-py-integration-test:
+  lint-js:
     needs: changes
-    if: needs.changes.outputs.sdk_py == 'true'
-    name: "sdk-py integration test"
-    uses: ./.github/workflows/_sdk_integration_test.yml
-    secrets: inherit
+    if: needs.changes.outputs.sdk-js == 'true'
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        working-directory:
+          - "libs/sdk-js"
+    defaults:
+      run:
+        working-directory: ${{ matrix.working-directory }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Node.js (LTS)
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+          cache: "yarn"
+          cache-dependency-path: ${{ matrix.working-directory }}/yarn.lock
+      - name: Install dependencies
+        run: yarn install
+      - name: Run lint
+        run: yarn lint
+      - name: Build
+        run: yarn build
+
+  test-js:
+    needs: changes
+    if: needs.changes.outputs.sdk-js == 'true'
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        working-directory:
+          - "libs/sdk-js"
+    defaults:
+      run:
+        working-directory: ${{ matrix.working-directory }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Node.js (LTS)
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+          cache: "yarn"
+          cache-dependency-path: ${{ matrix.working-directory }}/yarn.lock
+      - name: Install dependencies
+        run: yarn install
+      - name: Run tests
+        run: yarn test
 
   ci_success:
     name: "CI Success"
     needs:
       [
         lint,
+        lint-js,
         test,
         test-langgraph,
-        check-sdk-methods,
-        check-schema,
+        test-scheduler-kafka,
         integration-test,
-        sdk-py-integration-test,
+        test-js,
       ]
     if: |
       always()

.github/workflows/codespell.yml

@@ -0,0 +1,43 @@
+---
+    name: CI / cd . / make spell_check
+    
+    on:
+      push:
+        branches: [main]
+      pull_request:
+        branches: [main]
+    
+    permissions:
+      contents: read
+
+    defaults:
+      run:
+        working-directory: docs
+
+    jobs:
+      codespell:
+        name: (Check for spelling errors)
+        runs-on: ubuntu-latest
+    
+        steps:
+          - name: Checkout
+            uses: actions/checkout@v4
+    
+          - name: Install Dependencies
+            run: |
+              pip install toml codespell==2.3.0 jupytext
+    
+          - name: Extract Ignore Words List
+            run: |
+              # Use a Python script to extract the ignore words list from pyproject.toml
+              python ../.github/workflows/extract_ignored_words_list.py
+            id: extract_ignore_words
+    
+          - name: Codespell
+            uses: codespell-project/actions-codespell@v2
+            with:
+              skip: '*.ambr,*.lock,*.ipynb,*.yaml,*.zlib,*.md'
+              ignore_words_list: ${{ steps.extract_ignore_words.outputs.ignore_words_list }}
+          # We do this to avoid spellchecking cell outputs
+          - name: Codespell Notebooks
+            run: make codespell

.github/workflows/deploy-redirects.yml

@@ -1,49 +0,0 @@
-name: Deploy Redirects to GitHub Pages
-
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'docs/**'
-      - '.github/workflows/deploy-redirects.yml'
-  workflow_dispatch:
-
-permissions:
-  contents: read
-  pages: write
-  id-token: write
-
-concurrency:
-  group: "pages"
-  cancel-in-progress: false
-
-jobs:
-  deploy:
-    environment:
-      name: github-pages
-      url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-
-      - name: Setup Python
-        uses: actions/setup-python@5fda3b95a4ea91299a34e894583c3862153e4b97 # v7.0.0
-        with:
-          python-version: '3.11'
-
-      - name: Generate redirect files
-        run: python docs/generate_redirects.py
-
-      - name: Setup Pages
-        uses: actions/configure-pages@45bfe0192ca1faeb007ade9deae92b16b8254a0d # v6.0.0
-
-      - name: Upload artifact
-        uses: actions/upload-pages-artifact@fc324d3547104276b827a68afc52ff2a11cc49c9 # v5.0.0
-        with:
-          path: 'docs/_site'
-
-      - name: Deploy to GitHub Pages
-        id: deployment
-        uses: actions/deploy-pages@cd2ce8fcbc39b97be8ca5fce6e763baed58fa128 # v5.0.0

.github/workflows/deploy_docs.yml

@@ -0,0 +1,170 @@
+name: Deploy Docs
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+env:
+  POETRY_VERSION: "1.7.1"
+
+permissions:
+  contents: read
+  pages: write
+  id-token: write
+
+concurrency:
+  group: "pages"
+  cancel-in-progress: false
+
+defaults:
+  run:
+    working-directory: docs
+
+jobs:
+  get-changed-files:
+    runs-on: ubuntu-latest
+    outputs:
+      changed-files: ${{ steps.changed-files.outputs.added_modified }}
+    steps:
+      - uses: actions/checkout@v4
+      - name: Get changed files
+        id: changed-files
+        uses: Ana06/get-changed-files@v2.3.0
+        with:
+          filter: "docs/docs/**"
+
+  run-changed-notebooks:
+    needs: get-changed-files
+    uses: ./.github/workflows/run_notebooks.yml
+    secrets: inherit
+    with:
+      changed-files: ${{ needs.get-changed-files.outputs.changed-files }}
+
+  deploy:
+    # needs: run-changed-notebooks
+    runs-on: ubuntu-latest
+    timeout-minutes: 10 # Job will be cancelled if it runs for more than 10 minutes
+    env:
+      GITHUB_TOKEN: ${{ secrets.MKDOCS_GITHUB_TOKEN }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
+        with:
+          python-version: "3.12"
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: docs
+
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "22"
+          cache: "yarn"
+          cache-dependency-path: docs/yarn.lock
+
+      - name: Install dependencies
+        run: |
+          yarn
+          poetry install --with test --with docs --no-root
+          poetry run pip install -U \
+            pytest \
+            pytest-check-links \
+            GitPython \
+            "git+https://github.com/benjamincburns/markdown-exec.git@cc0d39d737e5ffd4b83d23cd8729d7ea16e363c8"
+
+          # we run this installation only for internal PRs
+          # as GITHUB_TOKEN is not available for PRs from outside contributors
+          if [ -n "${GITHUB_TOKEN}" ]; then
+            poetry run pip install "git+https://${GITHUB_TOKEN}@github.com/langchain-ai/mkdocs-material-insiders.git"
+          fi
+
+          poetry run jupyter kernelspec list
+          poetry run python3 -m ipykernel install --user --name=python3
+          npm install -g tslab
+          poetry run tslab install --python=python3
+          poetry run jupyter kernelspec list
+
+      - name: Run unit tests
+        # Run unit tests on the docs build pipeline
+        run: make tests
+      - name: Lint Docs
+        # This step lints the docs using the existing linting set up.
+        # It should be very fast and should not require any external services.
+        run: make lint-docs
+      - name: Build llms-text
+        run: make llms-text
+      - name: Build site
+        run: make build-docs
+        env:
+          MKDOCS_GIT_COMMITTERS_APIKEY: ${{ secrets.MKDOCS_GIT_COMMITTERS_APIKEY }}
+          OPENAI_API_KEY: sf-proj-1234567890 # fake placeholder, shouldn't actually be used
+          ANTHROPIC_API_KEY: sk-ant-api03-1234567890 # fake placeholder, shouldn't actually be used
+      - name: Check links in notebooks
+        env:
+          LANGCHAIN_API_KEY: test
+        run: |
+          if [ "${{ github.event_name }}" == "schedule" ] || [ "${{ github.event_name }}" == "workflow_dispatch" ] || ([ "${{ github.event_name }}" == "push" ] && [ "${{ github.ref }}" == "refs/heads/main" ]); then
+            echo "Running link check on all HTML files matching notebooks in docs directory..."
+            poetry run pytest -v \
+              --check-links-ignore "https://(api|web|docs)\.smith\.langchain\.com/.*" \
+              --check-links-ignore "https://academy\.langchain\.com/.*" \
+              --check-links-ignore "https://x.com/.*" \
+              --check-links-ignore "https://twitter.com/.*" \
+              --check-links-ignore "https://github\.com/.*" \
+              --check-links-ignore "http://localhost:8123/.*" \
+              --check-links-ignore "http://localhost:2024.*" \
+              --check-links-ignore "http://127.0.0.1:.*" \
+              --check-links-ignore "/.*\.(ipynb|html)$" \
+              --check-links-ignore "https://python\.langchain\.com/.*" \
+              --check-links-ignore "https://openai\.com/.*" \
+              --check-links-ignore "https://www\.uber\.com/.*" \
+              --check-links-ignore "https://pepy\.tech/.*" \
+              --check-links $(find site -name "index.html" | grep -v 'storm/index.html')
+              
+          else
+            echo "Fetching changes from origin/main..."
+            git fetch origin main
+            echo "Checking for changed notebook files..."
+            CHANGED_FILES=$(git diff --name-only --diff-filter=d origin/main | grep 'docs/docs/.*\.ipynb$' | grep -v 'storm.ipynb' | sed -E 's|^docs/docs/|site/|; s/\.ipynb$/\/index.html/' || true)
+            echo "Changed files: ${CHANGED_FILES}"
+            if [ -n "${CHANGED_FILES}" ]; then
+              echo "Running link check on HTML files matching changed notebook files..."
+              poetry run pytest -v \
+                --check-links-ignore "https://(api|web|docs)\.smith\.langchain\.com/.*" \
+                --check-links-ignore "https://academy\.langchain\.com/.*" \
+                --check-links-ignore "http://localhost:8123/.*" \
+                --check-links-ignore "http://localhost:2024.*" \
+                --check-links-ignore "http://127.0.0.1:.*" \
+                --check-links-ignore "https://x.com/.*" \
+                --check-links-ignore "https://twitter.com/.*" \
+                --check-links-ignore "https://github\.com/.*" \
+                --check-links-ignore "/.*\.(ipynb|html)$" \
+                --check-links ${CHANGED_FILES} \
+                || ([ $? = 5 ] && exit 0 || exit $?)
+            else
+              echo "No notebook files changed."
+            fi
+          fi
+
+      - name: Configure GitHub Pages
+        if: github.ref == 'refs/heads/main'
+        uses: actions/configure-pages@v4
+
+      - name: Upload Pages Artifact
+        # if: github.ref == 'refs/heads/main'
+        uses: actions/upload-pages-artifact@v3
+        with:
+          path: ./docs/site/
+
+      - name: Deploy to GitHub Pages
+        if: github.ref == 'refs/heads/main'
+        id: deployment
+        uses: actions/deploy-pages@v4

.github/workflows/extract_ignored_words_list.py

@@ -0,0 +1,10 @@
+import toml
+
+pyproject_toml = toml.load("pyproject.toml")
+
+# Extract the ignore words list (adjust the key as per your TOML structure)
+ignore_words_list = (
+    pyproject_toml.get("tool", {}).get("codespell", {}).get("ignore-words-list")
+)
+
+print(f"::set-output name=ignore_words_list::{ignore_words_list}")  # noqa: T201

.github/workflows/link_check.yml

@@ -0,0 +1,49 @@
+name: Check Docs & Links
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+  schedule:
+    - cron: "0 5 * * *"
+  workflow_dispatch:
+
+env:
+  POETRY_VERSION: "1.7.1"
+
+jobs:
+  markdown-link-check:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Check links in Markdown files
+        uses: gaurav-nelson/github-action-markdown-link-check@v1
+        with:
+          folder-path: "docs/"
+          check-modified-files-only: ${{ github.event_name != 'schedule' }}
+          file-path: "./README.md"
+          config-file: "./.markdown-link-check.config.json"
+
+  check-readmes-synced:
+    # This checks that the repo README.md is identical to the libs/langgraph/README.md
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+
+      - name: Check README.md is in sync
+        run: |
+            if ! diff -q README.md libs/langgraph/README.md >/dev/null; then
+            echo "README.md is out of sync with libs/langgraph/README.md"
+            diff -C 3 README.md libs/langgraph/README.md
+            exit 1
+            fi

.github/workflows/pr_lint.yml

@@ -1,47 +0,0 @@
-name: PR Title Lint
-
-permissions:
-  pull-requests: read
-
-on:
-  pull_request:
-    types: [opened, edited, synchronize]
-
-jobs:
-  lint-pr-title:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Validate PR Title
-        uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        with:
-          types: |
-            feat
-            fix
-            docs
-            style
-            refactor
-            perf
-            test
-            build
-            ci
-            chore
-            revert
-            release
-          scopes: |
-            checkpoint
-            checkpoint-postgres
-            checkpoint-sqlite
-            cli
-            langgraph
-            prebuilt
-            scheduler-kafka
-            sdk-py
-            docs
-            ci
-            deps
-            deps-dev
-          requireScope: false
-          ignoreLabels: |
-            ignore-lint-pr-title

.github/workflows/release.yml

@@ -8,14 +8,13 @@ on:
         type: string
         default: "libs/langgraph"
 
-permissions:
-  contents: read
-
 env:
   PYTHON_VERSION: "3.11"
+  POETRY_VERSION: "1.7.1"
 
 jobs:
   build:
+    if: github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
 
     outputs:
@@ -25,15 +24,14 @@ jobs:
       tag: ${{ steps.check-version.outputs.tag }}
 
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
 
-      - name: Set up Python
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          cache-suffix: "release"
-          enable-cache: false
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: release
 
       # We want to keep this build stage *separate* from the release stage,
       # so that there's no sharing of permissions between them.
@@ -47,11 +45,11 @@ jobs:
       # > from the publish job.
       # https://github.com/pypa/gh-action-pypi-publish#non-goals
       - name: Build project for distribution
-        run: uv build
+        run: poetry build
         working-directory: ${{ inputs.working-directory }}
 
       - name: Upload build
-        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
+        uses: actions/upload-artifact@v4
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
@@ -61,14 +59,8 @@ jobs:
         shell: bash
         working-directory: ${{ inputs.working-directory }}
         run: |
-          PKG_NAME=$(grep -m 1 "^name = " pyproject.toml | cut -d '"' -f 2)
-          if grep -q 'dynamic.*=.*\[.*"version".*\]' pyproject.toml; then
-            # handle dynamic versioning
-            DIR_NAME=$(echo "$PKG_NAME" | tr '-' '_')
-            VERSION=$(grep -m 1 '^__version__' "${DIR_NAME}/__init__.py" | cut -d '"' -f 2)
-          else
-            VERSION=$(grep -m 1 "^version = " pyproject.toml | cut -d '"' -f 2)
-          fi
+          PKG_NAME="$(poetry version | cut -d ' ' -f 1)"
+          VERSION="$(poetry version --short)"
           SHORT_PKG_NAME="$(echo "$PKG_NAME" | sed -e 's/langgraph//g' -e 's/-//g')"
           if [ -z $SHORT_PKG_NAME ]; then
             TAG="$VERSION"
@@ -87,7 +79,7 @@ jobs:
     outputs:
       release-body: ${{ steps.generate-release-body.outputs.release-body }}
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
         with:
           repository: langchain-ai/langgraph
           path: langgraph
@@ -143,9 +135,7 @@ jobs:
     needs:
       - build
       - release-notes
-    permissions:
-      contents: read
-      id-token: write
+    permissions: write-all
     uses: ./.github/workflows/_test_release.yml
     with:
       working-directory: ${{ inputs.working-directory }}
@@ -158,7 +148,7 @@ jobs:
       - test-pypi-publish
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
 
       # We explicitly *don't* set up caching here. This ensures our tests are
       # maximally sensitive to catching breakage.
@@ -173,12 +163,11 @@ jobs:
       # - The package is published, and it breaks on the missing dependency when
       #   used in the real world.
 
-      - name: Set up Python
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          enable-cache: false
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
 
       - name: Import published package
         shell: bash
@@ -196,18 +185,18 @@ jobs:
         # - attempt install again after 5 seconds if it fails because there is
         #   sometimes a delay in availability on test pypi
         run: |
-          uv run pip install \
+          poetry run pip install \
             --extra-index-url https://test.pypi.org/simple/ \
             "$PKG_NAME==$VERSION" || \
           ( \
             sleep 5 && \
-            uv run pip install \
+            poetry run pip install \
               --extra-index-url https://test.pypi.org/simple/ \
               "$PKG_NAME==$VERSION" \
           )
 
           if [[ "$PKG_NAME" == *prebuilt* ]]; then
-            uv run pip install langgraph
+            poetry run pip install langgraph
           fi
 
           if [[ "$PKG_NAME" == *checkpoint* || "$PKG_NAME" == *prebuilt* ]]; then
@@ -220,10 +209,10 @@ jobs:
             IMPORT_NAME="$(echo "$PKG_NAME" | sed s/-/_/g)"
           fi
 
-          uv run python -c "import $IMPORT_NAME; print(dir($IMPORT_NAME))"
+          poetry run python -c "import $IMPORT_NAME; print(dir($IMPORT_NAME))"
 
       - name: Import test dependencies
-        run: uv sync --group test
+        run: poetry install --with dev
         working-directory: ${{ inputs.working-directory }}
 
       # Overwrite the local version of the package with the test PyPI version.
@@ -234,7 +223,7 @@ jobs:
           PKG_NAME: ${{ needs.build.outputs.pkg-name }}
           VERSION: ${{ needs.build.outputs.version }}
         run: |
-          uv run pip install \
+          poetry run pip install \
             --extra-index-url https://test.pypi.org/simple/ \
             "$PKG_NAME==$VERSION"
 
@@ -262,23 +251,22 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
 
-      - name: Set up Python
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          cache-suffix: "release"
-          enable-cache: false
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: release
 
-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+      - uses: actions/download-artifact@v4
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Publish package distributions to PyPI
-        uses: pypa/gh-action-pypi-publish@dc37677b2e1c63e2034f94d8a5b11f265b73ba33 # release/v1
+        uses: pypa/gh-action-pypi-publish@release/v1
         with:
           packages-dir: ${{ inputs.working-directory }}/dist/
           verbose: true
@@ -304,28 +292,26 @@ jobs:
         working-directory: ${{ inputs.working-directory }}
 
     steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      - uses: actions/checkout@v4
 
-      - name: Set up Python
-        uses: ./.github/actions/uv_setup
+      - name: Set up Python + Poetry ${{ env.POETRY_VERSION }}
+        uses: "./.github/actions/poetry_setup"
         with:
           python-version: ${{ env.PYTHON_VERSION }}
-          cache-suffix: "release"
-          enable-cache: false
-          working-directory: ${{ inputs.working-directory }}
+          poetry-version: ${{ env.POETRY_VERSION }}
+          cache-key: release
 
-      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
+      - uses: actions/download-artifact@v4
         with:
           name: dist
           path: ${{ inputs.working-directory }}/dist/
 
       - name: Create Tag
-        uses: ncipollo/release-action@339a81892b84b4eeb0f6e744e4574d79d0d9b8dd # v1
+        uses: ncipollo/release-action@v1
         with:
           artifacts: "dist/*"
           token: ${{ secrets.GITHUB_TOKEN }}
           generateReleaseNotes: false
           tag: ${{needs.build.outputs.tag}}
-          name: ${{ needs.build.outputs.pkg-name }}==${{ needs.build.outputs.version }}
           body: ${{ needs.release-notes.outputs.release-body }}
           commit: ${{ github.sha }}

.github/workflows/release_js.yml

@@ -0,0 +1,38 @@
+name: JS Release
+
+on:
+  workflow_dispatch:
+
+jobs:
+  publish:
+    # Disallow publishing from branches that aren't `main`.
+    if: github.ref == 'refs/heads/main'
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        working-directory:
+          - "libs/sdk-js"
+
+    defaults:
+      run:
+        working-directory: ${{ matrix.working-directory }}
+
+    steps:
+      - uses: actions/checkout@v4
+      # JS Build
+      - name: Use Node.js
+        uses: actions/setup-node@v3
+        with:
+          node-version: "20"
+          cache: "yarn"
+          cache-dependency-path: ${{ matrix.working-directory }}/yarn.lock
+
+      - name: Install dependencies
+        run: yarn install
+      - name: Build
+        run: yarn build
+      - name: Publish package to NPM
+        run: |
+          echo "//registry.npmjs.org/:_authToken=${{ secrets.NPM_TOKEN }}" > .npmrc
+          npm publish

.github/workflows/reopen_on_assignment.yml

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

.github/workflows/require_issue_link.yml

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

.github/workflows/run_notebooks.yml

@@ -0,0 +1,82 @@
+name: Run notebooks
+
+on:
+  workflow_dispatch:
+  workflow_call:
+    inputs:
+      changed-files:
+        required: false
+        type: string
+        description: "JSON string of changed files"
+  schedule:
+    - cron: '0 13 * * *'
+
+defaults:
+  run:
+    working-directory: docs
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        lib-version:
+          - "development"
+          - "latest"
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python + Poetry
+        uses: "./.github/actions/poetry_setup"
+        with:
+          python-version: 3.11
+          poetry-version: 1.7.1
+          cache-key: test-langgraph-notebooks
+
+      - name: Install dependencies
+        run: |
+          poetry install --with test
+          poetry run pip install jupyter
+
+      - name: Start services
+        run: make start-services
+
+      - name: Pre-download tiktoken files
+        run: |
+          poetry run python _scripts/download_tiktoken.py
+
+      - name: Prepare notebooks
+        run: |
+          if [ "${{ matrix.lib-version }}" = "development" ]; then
+            poetry run python _scripts/prepare_notebooks_for_ci.py --comment-install-cells
+          else
+            poetry run python _scripts/prepare_notebooks_for_ci.py
+          fi
+
+      - name: Run notebooks
+        env:
+          # these won't actually be used because of the VCR cassettes
+          # but need to set them to avoid triggering getpass()
+          OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
+          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          TAVILY_API_KEY: ${{ secrets.TAVILY_API_KEY }}
+          LANGSMITH_API_KEY: ${{ secrets.LANGSMITH_API_KEY }}
+          NOMIC_API_KEY: ${{ secrets.NOMIC_API_KEY }}
+          COHERE_API_KEY: ${{ secrets.COHERE_API_KEY }}
+          FIREWORKS_API_KEY: ${{ secrets.FIREWORKS_API_KEY }}
+        run: |
+          if [ "${{ github.event_name }}" = "workflow_dispatch" ] || [ "${{ github.event_name }}" = "schedule" ]; then
+            echo "Running all notebooks"
+            ./_scripts/execute_notebooks.sh
+          else
+            CHANGED_FILES=$(echo '${{ inputs.changed-files }}' | tr ' ' '\n' | sed 's|^docs/docs/|docs/|' | grep '\.ipynb$' || true)
+            if [ -n "$CHANGED_FILES" ]; then
+              echo "Running changed notebooks: $CHANGED_FILES"
+              ./_scripts/execute_notebooks.sh $CHANGED_FILES
+            else
+              echo "No notebook files changed, skipping execution"
+            fi
+          fi
+
+      - name: Stop services
+        run: make stop-services

.github/workflows/size.yml

@@ -0,0 +1,29 @@
+name: Check File Size
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+  workflow_dispatch:
+
+jobs:
+  file-size-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Get changed files
+        id: changed-files
+        uses: tj-actions/changed-files@v44
+      - name: Filter by size
+        # TODO: roll back the web voyager hack
+        run: |
+          large_added_files=$(find ${{ steps.changed-files.outputs.added_files }} -maxdepth 0 -size +1M | grep -v "web_voyager" || true)
+          if [ -n "$large_added_files" ]; then
+            echo "Large files added: $large_added_files"
+            echo "# Large files added:" >> $GITHUB_STEP_SUMMARY
+            echo "$large_added_files" >> $GITHUB_STEP_SUMMARY
+            exit 1
+          fi

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

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

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

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

.github/workflows/uv_lock_ugprade.yml

@@ -1,43 +0,0 @@
-name: UV Lock Upgrade
-
-on:
-  schedule:
-    # run at midnight every Sunday
-    - cron: '0 0 * * 0'
-  # allow manual triggering
-  workflow_dispatch:
-
-permissions:
-  contents: write
-  pull-requests: write
-
-jobs:
-  upgrade-dependencies:
-    runs-on: ubuntu-latest
-    
-    steps:
-      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
-      
-      - name: Set up uv
-        uses: ./.github/actions/uv_setup
-        with:
-          python-version: "3.10"
-          cache-suffix: "uv-lock-upgrade"
-          
-      - name: Run uv lock --upgrade in all Python packages
-        run: make lock-upgrade
-          
-      - name: Create Pull Request
-        uses: peter-evans/create-pull-request@5f6978faf089d4d20b00c7766989d076bb2fc7f1 # v8
-        with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          commit-message: "chore(deps): upgrade dependencies with `uv lock --upgrade`"
-          title: "chore(deps): upgrade dependencies with `uv lock --upgrade`"
-          body: |
-            This PR updates the dependencies in all Python packages using `uv lock --upgrade`.
-            
-            This is an automated PR created by the UV Lock Upgrade workflow.
-          branch: deps/uv-lock-upgrade
-          delete-branch: true
-          labels: |
-            dependencies

.gitignore

@@ -6,6 +6,9 @@ __pycache__/
 *.py[cod]
 *$py.class
 
+# C extensions
+*.so
+
 # Distribution / packaging
 .Python
 build/
@@ -51,12 +54,27 @@ coverage.xml
 .hypothesis/
 .pytest_cache/
 
+# Translations
+*.mo
+*.pot
+
 # Django stuff:
 *.log
 local_settings.py
 db.sqlite3
 db.sqlite3-journal
 
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+docs/docs/_build/
+
 # PyBuilder
 target/
 
@@ -71,9 +89,23 @@ ipython_config.py
 # pyenv
 .python-version
 
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
 # PEP 582; used by e.g. github.com/David-OConnor/pyflow
 __pypackages__/
 
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
 # Environments
 .env
 .envrc
@@ -85,6 +117,16 @@ ENV/
 env.bak/
 venv.bak/
 
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
 # mypy
 .mypy_cache/
 .dmypy.json
@@ -96,8 +138,45 @@ dmypy.json
 # macOS display setting files
 .DS_Store
 
+# Wandb directory
+wandb/
+
+# asdf tool versions
+.tool-versions
+/.ruff_cache/
+
+*.pkl
+*.bin
+
+# integration test artifacts
+data_map*
+\[('_type', 'fake'), ('stop', None)]
+
+# Replit files
+*replit*
+
+node_modules
+docs/.yarn/
+docs/node_modules/
+docs/.docusaurus/
+docs/.cache-loader/
+docs/_dist
+docs/api_reference/api_reference.rst
+docs/api_reference/experimental_api_reference.rst
+docs/api_reference/_build
+docs/api_reference/*/
+!docs/api_reference/_static/
+!docs/api_reference/templates/
+!docs/api_reference/themes/
+docs/docs_skeleton/build
+docs/docs_skeleton/node_modules
+docs/docs_skeleton/yarn.lock
+
+# Any new jupyter notebooks
+# not intended for the repo
+Untitled*.ipynb
+
+Chinook.db
+
 .vercel
 .turbo
-.editorconfig
-.scratch
-.worktrees/

.markdown-link-check.config.json

@@ -0,0 +1,4 @@
+{
+  "aliveStatusCodes": [200, 206, 402],
+  "ignorePatterns": ["*dcbadge.vercel.app*"]
+}

.markdownlint.json

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

AGENTS.md

@@ -1,57 +0,0 @@
-# AGENTS Instructions
-
-This repository is a monorepo. Each library lives in a subdirectory under `libs/`.
-
-When you modify code in any library, run the following commands in that library's directory before creating a pull request:
-
-- `make format` – run code formatters
-- `make lint` – run the linter
-- `make test` – execute the test suite
-
-To run a particular test file or to pass additional pytest options you can specify the `TEST` variable:
-
-```txt
-TEST=path/to/test.py make test
-```
-
-Other pytest arguments can also be supplied inside the `TEST` variable.
-
-## Libraries
-
-The repository contains several Python and JavaScript/TypeScript libraries.
-Below is a high-level overview:
-
-- **checkpoint** – base interfaces for LangGraph checkpointers.
-- **checkpoint-postgres** – Postgres implementation of the checkpoint saver.
-- **checkpoint-sqlite** – SQLite implementation of the checkpoint saver.
-- **cli** – official command-line interface for LangGraph.
-- **langgraph** – core framework for building stateful, multi-actor agents.
-- **prebuilt** – high-level APIs for creating and running agents and tools.
-- **sdk-js** – JS/TS SDK for interacting with the LangGraph REST API.
-- **sdk-py** – Python SDK for the LangGraph Server API.
-
-### Dependency map
-
-The diagram below lists downstream libraries for each production dependency as
-declared in that library's `pyproject.toml` (or `package.json`).
-
-```text
-checkpoint
-├── checkpoint-postgres
-├── checkpoint-sqlite
-├── prebuilt
-└── langgraph
-
-prebuilt
-└── langgraph
-
-sdk-py
-├── langgraph
-└── cli
-
-sdk-js (standalone)
-```
-
-Changes to a library may impact all of its dependents shown above.
-
-- Do NOT use Sphinx-style double backtick formatting (` ``code`` `). Use single backticks (`` `code` ``) for inline code references in docstrings and comments.

CLAUDE.md

@@ -1,57 +1,142 @@
-# AGENTS Instructions
+# LangGraph Coding Guide
 
-This repository is a monorepo. Each library lives in a subdirectory under `libs/`.
+## Repository Structure
 
-When you modify code in any library, run the following commands in that library's directory before creating a pull request:
+LangGraph follows a monorepo organization, with the following structure:
 
-- `make format` – run code formatters
-- `make lint` – run the linter
-- `make test` – execute the test suite
+- `libs/langgraph` is the main Python library, published to pypi as `langgraph`. This contains the majority of the code for the framework, as well as the majority of the unit tests.
+- `libs/checkpoint` , published to pypi as `langgraph-checkpoint` contains the base classes for the persistence layer of langgraph. The two main abstractions are BaseCheckpointSaver (base class for persistence of workflow runs step-by-step) and BaseStore (base class for "long-term memory" operations, offering a key-value interface combined with semantic search over documents, used for persisting information across distinct workflow runs). This library is a dependency of both the main langgraph library, as well as implementations of these storage interfaces for specific databases. This library also contains reference implementations
+- `libs/checkpoint-postgres` published to pypi as langgraph-checkpoint-postgres, contains implementations of checkpoint and store backed by postgres. Majority of the test coverage is in `libs/langgraph` in the form of tests that run over all storage implementations in the repo.
+- `langgraph-java` contains a Java implementation of the langgraph framework, which is in the early stages of development.
 
-To run a particular test file or to pass additional pytest options you can specify the `TEST` variable:
+## Feature Overview
 
-```
-TEST=path/to/test.py make test
-```
+langgraph is an orchestration framework (in the style of airflow or temporal) designed for LLM applications, with a focus on streaming output, cyclical and parallel workflows, and interrupt/resume capabilities. Applications built with langgraph are variously called workflows, graphs, cognitive architectures, agents. Key features:
 
-Other pytest arguments can also be supplied inside the `TEST` variable.
+1. **Graph-based Architecture**: Build directed computation graphs with nodes and edges
+2. **State Management**: Type-safe state schema with custom reducers and transformations
+3. **Human-in-the-loop**: Support for interrupts, checkpoints, and tool call review
+4. **Persistence**: Save and resume execution with in-memory or database storage
+5. **Streaming**: Multiple modes (values, updates, custom) for real-time feedback
+6. **Multi-agent Patterns**: Support for network, supervisor, and hierarchical architectures
 
-## Libraries
+## Python Development
 
-The repository contains several Python and JavaScript/TypeScript libraries.
-Below is a high-level overview:
+### Build/Test/Lint Commands
 
-- **checkpoint** – base interfaces for LangGraph checkpointers.
-- **checkpoint-postgres** – Postgres implementation of the checkpoint saver.
-- **checkpoint-sqlite** – SQLite implementation of the checkpoint saver.
-- **cli** – official command-line interface for LangGraph.
-- **langgraph** – core framework for building stateful, multi-actor agents.
-- **prebuilt** – high-level APIs for creating and running agents and tools.
-- **sdk-js** – JS/TS SDK for interacting with the LangGraph REST API.
-- **sdk-py** – Python SDK for the LangGraph Server API.
+(in the respective subdirectory)
 
-### Dependency map
+- Run all tests: `make test`
+- Run single test: `make test TEST=path/to/test_file.py::test_function`
+- Watch mode tests: `make test_watch`
+- Run tests in parallel: `make test_parallel`
+- Generate coverage report: `make coverage`
+- Format code: `make format`
+- Lint code: `make lint`
+- Check spelling: `make spell_check`
+- Fix spelling: `make spell_fix`
+- Build documentation: `make serve-docs` (from repo root)
+- Run benchmarks: `make benchmark` or `make benchmark-fast`
 
-The diagram below lists downstream libraries for each production dependency as
-declared in that library's `pyproject.toml` (or `package.json`).
+### Code Style Guidelines
 
-```text
-checkpoint
-├── checkpoint-postgres
-├── checkpoint-sqlite
-├── prebuilt
-└── langgraph
+- Follow [ruff](https://github.com/astral-sh/ruff) formatting/linting rules
+- Use [Google Python Style Guide](https://google.github.io/styleguide/pyguide.html) for docstrings
+- Enforce type annotations with mypy (`disallow_untyped_defs = True`)
+- Use double quotes for strings
+- Maximum line length of 88 characters
+- Follow imports sorting with `ruff`
+- All functions/classes must have proper docstrings with args/returns
+- Write comprehensive unit tests for new features
+- Keep backward compatibility
+- PR scope should be isolated (changes shouldn't affect multiple packages)
+- Use descriptive variable names following Python conventions
+- Error handling should use appropriate exception types and messaging
 
-prebuilt
-└── langgraph
+## Java Development
 
-sdk-py
-├── langgraph
-└── cli
+(in the `langgraph-java` subdirectory)
 
-sdk-js (standalone)
-```
+### Build/Test/Lint Commands
 
-Changes to a library may impact all of its dependents shown above.
+- Build the project: `./gradlew build`
+- Run tests: `./gradlew test`
+- Run a specific test: `./gradlew test --tests "com.langgraph.package.TestClass.testMethod"`
+- Check formatting: `./gradlew spotlessCheck`
+- Apply formatting: `./gradlew spotlessApply`
+- Run all checks: `./gradlew check`
+- Generate Javadoc: `./gradlew javadoc`
 
-- Do NOT use Sphinx-style double backtick formatting (` ``code`` `). Use single backticks (`` `code` ``) for inline code references in docstrings and comments.
+### Code Style Guidelines
+
+- Follow standard Java code style (Google Java Style Guide)
+- Use 4 spaces for indentation
+- Maximum line length of 100 characters
+- All public methods/classes must have proper Javadoc with @param/@return tags
+- Use descriptive variable names following Java conventions (camelCase)
+- Exception handling should use appropriate exception types with descriptive messages
+- Favor composition over inheritance
+- Use the Builder pattern for complex object creation
+- Write comprehensive unit tests for new features
+
+### Python Compatibility Guidelines
+
+- When implementing features from the Python version:
+  - Maintain semantic equivalence with the Python implementation
+  - Preserve the same behavior for all public APIs
+  - Document any intentional differences in behavior with comments
+  - Pay special attention to collections handling (Python lists vs Java Lists)
+  - Ensure that iteration order and value handling match Python where relevant
+- Use the same test cases as the Python version when possible
+- Do not introduce Java-specific shortcuts that would break Python compatibility
+- Never add test-specific code to source files - tests should adapt to implementation, not vice versa
+
+### Implementation Mapping
+
+- Always consult and update the `PYTHON_JAVA_MAPPING.md` file when:
+  - Adding new Java files or classes
+  - Updating existing Java implementations
+  - Fixing test failures in Java
+  - Implementing Python features in Java
+- This mapping file documents:
+  - Where to find equivalent functionality in Python and Java
+  - Any intentional deviations between implementations
+  - Implementation status and compatibility notes
+- When tests fail, check if the Java implementation matches Python behavior:
+  - Fix the implementation to match Python semantics whenever possible
+  - Update tests only if the Python version also differs
+  - Never create special cases or workarounds in Java just to make tests pass
+  - Document any implementation differences clearly in the mapping file
+- For new features, implement the Python behavior first, then adapt to Java idioms
+
+### Backward Compatibility and API Design
+
+- LangGraph Java has not been released publicly, so there is no need to maintain backward compatibility
+- When renaming methods, members, or classes:
+  - Use the clearest, most intuitive names that match Python semantics
+  - Remove old/deprecated methods completely rather than marking them as deprecated
+  - Update all tests and documentation to use the new names
+  - Do not leave deprecated methods or tests for backward compatibility
+
+### API Design Principles
+
+- Prefer a single, clear way to accomplish each task rather than multiple convenience methods
+- Prefer builder patterns over static factory methods where appropriate
+- For collections, prefer methods that operate on collections rather than having both single-item and collection variants
+- Choose method names that clearly express their purpose and align with Java conventions
+- Maintain consistent naming patterns across similar components
+- Document the recommended usage pattern in JavaDoc
+
+### Project Structure
+
+- `langgraph-core`: Core functionality of the framework
+- `langgraph-checkpoint`: Persistence layer for checkpoints and state management
+- `langgraph-examples`: Example applications and usage patterns
+
+### Error Handling
+
+- Use runtime exceptions for unexpected errors
+- Use checked exceptions for recoverable errors
+- Provide clear error messages that include context about what went wrong
+- Validate inputs early to prevent cascading errors
+- Ensure all resources are properly closed even in error conditions

CONTRIBUTING.md

@@ -0,0 +1,293 @@
+# Contributing to LangGraph
+
+Thank you for being interested in contributing to LangGraph!
+
+## General guidelines
+
+Here are some things to keep in mind for all types of contributions:
+
+- Follow the ["fork and pull request"](https://docs.github.com/en/get-started/exploring-projects-on-github/contributing-to-a-project) workflow.
+- Fill out the checked-in pull request template when opening pull requests. Note related issues and tag relevant maintainers.
+- Ensure your PR passes formatting, linting, and testing checks before requesting a review.
+  - If you would like comments or feedback, please open an issue or discussion and tag a maintainer.
+- Backwards compatibility is key. Your changes must not be breaking, except in case of critical bug and security fixes.
+- Look for duplicate PRs or issues that have already been opened before opening a new one.
+- Keep scope as isolated as possible. As a general rule, your changes should not affect more than one package at a time.
+
+### Bugfixes
+
+For bug fixes, please open up an issue before proposing a fix to ensure the proposal properly addresses the underlying problem. In general, bug fixes should all have an accompanying unit test that fails before the fix.
+
+### New features
+
+For new features, please start a new [discussion](https://github.com/langchain-ai/langgraph/discussions), where the maintainers will help with scoping out the necessary changes.
+
+## Contribute Documentation
+
+Documentation is a vital part of LangGraph. We welcome both new documentation for new features and
+community improvements to our current documentation. Please read the resources below before getting started:
+
+- [Documentation style guide](#documentation-style-guide)
+- [Documentation setup](#setup)
+
+## Documentation Style Guide
+
+As LangGraph continues to grow, the surface area of documentation required to cover it continues to grow too.
+This page provides guidelines for anyone writing documentation for LangGraph, as well as some of our philosophies around organization and structure.
+
+## Philosophy
+
+LangGraph's documentation follows the [Diataxis framework](https://diataxis.fr).
+Under this framework, all documentation falls under one of four categories: [Tutorials](#tutorials),
+[How-to guides](#how-to-guides),
+[References](#references), and [Explanations (aka conceptual guides)](#conceptual-guide).
+
+### Tutorials
+
+Tutorials are lessons that take the reader through a practical activity. Their purpose is to help the user
+gain understanding of concepts and how they interact by showing one way to achieve some goal in a hands-on way.
+
+They should **avoid** giving
+multiple permutations of ways to achieve that goal in-depth. Choice is burdensome. Instead, they should guide a new user through a recommended path to accomplishing a concrete goal. While the end result of a tutorial does not necessarily need to
+be completely production-ready, it should be useful and practically satisfy the goal that you clearly stated in the tutorial's introduction.
+
+To quote the Diataxis website:
+
+> A tutorial serves the user’s *acquisition* of skills and knowledge - their study. Its purpose is not to help the user get something done, but to help them learn.
+
+In LangGraph, these are often higher level guides that show off end-to-end use cases.
+
+Some examples include:
+
+- [Build a Customer Support Bot](https://langchain-ai.github.io/langgraph/tutorials/customer-support/customer-support/)
+- [Build a SQL Agent](https://langchain-ai.github.io/langgraph/tutorials/sql-agent/)
+
+Here are some high-level tips on writing a good tutorial:
+
+- Focus on guiding the user to get something done, but keep in mind the end-goal is more to impart principles than to create a perfect production system.
+- Be specific, not abstract and follow one path.
+  - No need to go deeply into alternative approaches, but it’s ok to reference them, ideally with a link to an appropriate how-to guide.
+- Get "a point on the board" as soon as possible - something the user can run that outputs something.
+  - You can iterate and expand afterwards.
+  - Try to frequently checkpoint at given steps where the user can run code and see progress.
+- Focus on results, not technical explanation.
+  - Crosslink heavily to appropriate conceptual/reference pages
+- The first time you mention a LangGraph concept, use its full name (e.g. "human-in-the-loop"), and link to its conceptual/other documentation page.
+  - It's also helpful to add a prerequisite callout that links to any pages with necessary background information.
+- End with a recap/next steps section summarizing what the tutorial covered and future reading, such as related how-to guides.
+- Use phrases like "Next we can run X & Y. We will expect Z.". Then afterwards, use language like "Notice Z" that recalls our expectations and directs the reader's attention to the topic we are trying to teach.
+- Do not shy away from repetition.
+
+### How-to guides
+
+A how-to guide, as the name implies, demonstrates how to do something discrete and specific.
+It should assume that the user is already familiar with underlying concepts, and is trying to solve an immediate problem, but
+should still give some background or list the scenarios where the information contained within can be relevant.
+They can and should discuss alternatives if one approach may be better than another in certain cases.
+
+To quote the Diataxis website:
+
+> A how-to guide serves the work of the already-competent user, whom you can assume to know what they want to do, and to be able to follow your instructions correctly.
+
+Some examples include:
+
+- [How to add persistence to your graph](https://langchain-ai.github.io/langgraph/how-tos/persistence/)
+- [How to view and update past graph state](https://langchain-ai.github.io/langgraph/how-tos/human_in_the_loop/time-travel/)
+
+Here are some high-level tips on writing a good how-to guide:
+
+- Clearly explain what you are guiding the user through at the start
+- Assume higher intent than a tutorial and show what the user needs to do to get that task done
+- Assume familiarity of concepts, but explain why suggested actions are helpful
+  - Crosslink heavily to conceptual/reference pages
+- Discuss alternatives and responses to real-world tradeoffs that may arise when solving a problem
+- Use lots of example code, ideally within complete code blocks that the reader can copy and run.
+- End with a recap/next steps section summarizing what the tutorial covered and future reading, such as other related how-to guides
+
+### Conceptual guides
+
+LangGraph's conceptual guides fall under the **Explanation** quadrant of Diataxis. They should cover LangChain terms and concepts
+in a more abstract way than how-to guides or tutorials, and should be geared towards curious users interested in
+gaining a deeper understanding of the framework. Try to avoid excessively large code examples. The goal here is to
+impart perspective to the user rather than to finish a practical project. These guides should cover **why** things work they way they do.
+
+
+To quote the Diataxis website:
+
+> The perspective of explanation is higher and wider than that of the other types. It does not take the user’s eye-level view, as in a how-to guide, or a close-up view of the machinery, like reference material. Its scope in each case is a topic - “an area of knowledge”, that somehow has to be bounded in a reasonable, meaningful way.
+
+Some examples include:
+
+- [What does it mean to be agentic?](https://langchain-ai.github.io/langgraph/concepts/high_level/)
+- [Tool calling](https://langchain-ai.github.io/langgraph/concepts/agentic_concepts/#tool-calling)
+
+Here are some high-level tips on writing a good conceptual guide:
+
+- Explain design decisions. Why does concept X exist and why was it designed this way?
+- Use analogies and reference other concepts and alternatives
+- Avoid blending in too much reference content
+- You can and should reference content covered in other guides, but make sure to link to them
+
+### References
+
+References contain detailed, low-level information that describes exactly what functionality exists and how to use it.
+In LangGraph, this is mainly our API reference pages, which are populated from docstrings within code.
+References pages are generally not read end-to-end, but are consulted as necessary when a user needs to know
+how to use something specific.
+
+To quote the Diataxis website:
+
+> The only purpose of a reference guide is to describe, as succinctly as possible, and in an orderly way. Whereas the content of tutorials and how-to guides are led by needs of the user, reference material is led by the product it describes.
+
+Many of the reference pages in LangChain are automatically generated from code,
+but here are some high-level tips on writing a good docstring:
+
+- Be concise
+- Discuss special cases and deviations from a user's expectations
+- Go into detail on required inputs and outputs
+- Light details on when one might use the feature are fine, but in-depth details belong in other sections.
+
+Each category serves a distinct purpose and requires a specific approach to writing and structuring the content.
+
+## General guidelines
+
+Here are some other guidelines you should think about when writing and organizing documentation.
+
+We generally do not merge new tutorials from outside contributors without an actue need.
+We welcome updates as well as new integration docs, how-tos, and references.
+
+### Avoid duplication
+
+Multiple pages that cover the same material in depth are difficult to maintain and cause confusion. There should
+be only one (very rarely two), canonical pages for a given concept or feature. Instead, you should link to other guides.
+
+### Link to other sections
+
+Because sections of the docs do not exist in a vacuum, it is important to link to other sections as often as possible
+to allow a developer to learn more about an unfamiliar topic inline.
+
+This includes linking to the API references as well as conceptual sections!
+
+### Be concise
+
+In general, take a less-is-more approach. If a section with a good explanation of a concept already exists, you should link to it rather than
+re-explain it, unless the concept you are documenting presents some new wrinkle.
+
+Be concise, including in code samples.
+
+### General style
+
+- Use active voice and present tense whenever possible
+- Use examples and code snippets to illustrate concepts and usage
+- Use appropriate header levels (`#`, `##`, `###`, etc.) to organize the content hierarchically
+- Use fewer cells with more code to make copy/paste easier
+- Use bullet points and numbered lists to break down information into easily digestible chunks
+- Use tables (especially for **Reference** sections) and diagrams often to present information visually
+- Include the table of contents for longer documentation pages to help readers navigate the content, but hide it for shorter pages
+
+## Setup
+
+LangChain documentation consists of two components:
+
+1. Main Documentation: Hosted at [https://langchain-ai.github.io](https://langchain-ai.github.io/langgraph/),
+this comprehensive resource serves as the primary user-facing documentation.
+It covers a wide array of topics, including tutorials, use cases, integrations,
+and more, offering extensive guidance on building with LangGraph.
+The content for this documentation lives in the `/docs` directory of the monorepo.
+2. In-code Documentation: This is documentation of the codebase itself, which is also
+used to generate the externally facing [API Reference](https://langchain-ai.github.io/langgraph/reference/graphs/).
+The content for the API reference is autogenerated by scanning the docstrings in the codebase. For this reason we ask that developers document their code well.
+
+We appreciate all contributions to the documentation, whether it be fixing a typo,
+adding a new tutorial or example and whether it be in the main documentation or the API Reference.
+
+### 📜 Main Documentation
+
+The content for the main documentation is located in the `/docs` directory of the monorepo.
+
+The documentation is written using a combination of ipython notebooks (`.ipynb` files)
+and markdown (`.md` files). The notebooks are converted to markdown
+and then built using [MkDocs](https://www.mkdocs.org/).
+
+Feel free to make contributions to the main documentation! 🥰
+
+After modifying the documentation:
+
+1. Run the linting and formatting commands (see below) to ensure that the documentation is well-formatted and free of errors.
+2. Optionally build the documentation locally to verify that the changes look good.
+3. Make a pull request with the changes.
+
+### ⚒️ Linting and Building Documentation Locally
+
+After writing up the documentation, you may want to lint and build the documentation
+locally to ensure that it looks good and is free of errors.
+
+If you're unable to build it locally that's okay as well, as you will be able to
+see a preview of the documentation on the pull request page.
+
+From the **monorepo root**, run the following command to install the dependencies:
+
+```bash
+poetry install --with docs --no-root
+```
+
+#### Building
+
+The code that builds the documentation is located in the `/docs` directory of the monorepo.
+
+Before building the documentation, it is always a good idea to clean the build directory:
+
+```bash
+make clean-docs
+```
+
+You can build and preview the documentation as outlined below:
+
+```bash
+make serve-docs
+```
+
+#### Linting
+
+The documentation is linted from the **monorepo root**. To lint it, run the following from there:
+
+```bash
+make spellcheck
+```
+
+### ️In-code Documentation
+
+The in-code documentation is autogenerated from docstrings.
+
+For the API reference to be useful, the codebase must be well-documented. This means that all functions, classes, and methods should have a docstring that explains what they do, what the arguments are, and what the return value is. This is a good practice in general, but it is especially important for LangChain because the API reference is the primary resource for developers to understand how to use the codebase.
+
+We generally follow the [Google Python Style Guide](https://google.github.io/styleguide/pyguide.html#38-comments-and-docstrings) for docstrings.
+
+Here is an example of a well-documented function:
+
+```python
+
+def my_function(arg1: int, arg2: str) -> float:
+    """This is a short description of the function. (It should be a single sentence.)
+
+    This is a longer description of the function. It should explain what
+    the function does, what the arguments are, and what the return value is.
+    It should wrap at 88 characters.
+
+    Examples:
+        This is a section for examples of how to use the function.
+
+        .. code-block:: python
+
+            my_function(1, "hello")
+
+    Args:
+        arg1: This is a description of arg1. We do not need to specify the type since
+            it is already specified in the function signature.
+        arg2: This is a description of arg2.
+
+    Returns:
+        This is a description of the return value.
+    """
+    return 3.14
+```

Makefile

@@ -1,68 +0,0 @@
-# Define the directories containing projects
-LIBS_DIRS := $(wildcard libs/*)
-
-# Default target
-.PHONY: all
-all: lint format lock test
-
-# Install dependencies for all projects
-.PHONY: install
-install:
-	@echo "Creating virtual environment..."
-	@uv venv
-	@for dir in $(LIBS_DIRS); do \
-		if [ -f $$dir/pyproject.toml ]; then \
-			echo "Installing dependencies for $$dir"; \
-			uv pip install -e $$dir; \
-		fi; \
-	done
-
-# Lint all projects
-.PHONY: lint
-lint:
-	@for dir in $(LIBS_DIRS); do \
-		if [ -f $$dir/Makefile ]; then \
-			echo "Running lint in $$dir"; \
-			$(MAKE) -C $$dir lint; \
-		fi; \
-	done
-
-# Format all projects
-.PHONY: format
-format:
-	@for dir in $(LIBS_DIRS); do \
-		if [ -f $$dir/Makefile ]; then \
-			echo "Running format in $$dir"; \
-			$(MAKE) -C $$dir format; \
-		fi; \
-	done
-
-# Lock all projects
-.PHONY: lock
-lock:
-	@for dir in $(LIBS_DIRS); do \
-		if [ -f $$dir/Makefile ]; then \
-			echo "Running lock in $$dir"; \
-			(cd $$dir && uv lock); \
-		fi; \
-	done
-
-# Lock all projects and upgrade dependencies
-.PHONY: lock-upgrade
-lock-upgrade:
-	@for dir in $(LIBS_DIRS); do \
-		if [ -f $$dir/Makefile ]; then \
-			echo "Running lock-upgrade in $$dir"; \
-			(cd $$dir && uv lock --upgrade); \
-		fi; \
-	done
-
-# Test all projects
-.PHONY: test
-test:
-	@for dir in $(LIBS_DIRS); do \
-		if [ -f $$dir/Makefile ]; then \
-			echo "Running test in $$dir"; \
-			$(MAKE) -C $$dir test; \
-		fi; \
-	done

README.md

@@ -1,82 +1,339 @@
-<div align="center">
-  <a href="https://www.langchain.com/langgraph">
-    <picture>
-      <source media="(prefers-color-scheme: dark)" srcset=".github/images/logo-dark.svg">
-      <source media="(prefers-color-scheme: light)" srcset=".github/images/logo-light.svg">
-      <img alt="LangGraph Logo" src=".github/images/logo-dark.svg" width="50%">
-    </picture>
-  </a>
-</div>
+# 🦜🕸️LangGraph
 
-<div align="center">
-  <h3>Low-level orchestration framework for building stateful agents.</h3>
-</div>
+![Version](https://img.shields.io/pypi/v/langgraph)
+[![Downloads](https://static.pepy.tech/badge/langgraph/month)](https://pepy.tech/project/langgraph)
+[![Open Issues](https://img.shields.io/github/issues-raw/langchain-ai/langgraph)](https://github.com/langchain-ai/langgraph/issues)
+[![Docs](https://img.shields.io/badge/docs-latest-blue)](https://langchain-ai.github.io/langgraph/)
 
-<div align="center">
-  <a href="https://opensource.org/licenses/MIT" target="_blank"><img src="https://img.shields.io/pypi/l/langgraph" alt="PyPI - License"></a>
-  <a href="https://pypistats.org/packages/langgraph" target="_blank"><img src="https://img.shields.io/pepy/dt/langgraph" alt="PyPI - Downloads"></a>
-  <a href="https://pypi.org/project/langgraph/" target="_blank"><img src="https://img.shields.io/pypi/v/langgraph.svg?label=%20" alt="Version"></a>
-  <a href="https://x.com/langchain_oss" target="_blank"><img src="https://img.shields.io/twitter/url/https/twitter.com/langchain_oss.svg?style=social&label=Follow%20%40LangChain" alt="Twitter / X"></a>
-</div>
+⚡ Building language agents as graphs ⚡
 
-<br>
+> [!NOTE]
+> Looking for the JS version? See the [JS repo](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://langchain-ai.github.io/langgraphjs/).
 
-Trusted by companies shaping the future of agents – including Klarna, Replit, Elastic, and more – LangGraph is a low-level orchestration framework for building, managing, and deploying long-running, stateful agents.
+## Overview
 
-```bash
+[LangGraph](https://langchain-ai.github.io/langgraph/) is a library for building
+stateful, multi-actor applications with LLMs, used to create agent and multi-agent
+workflows. Check out an introductory tutorial [here](https://langchain-ai.github.io/langgraph/tutorials/introduction/).
+
+
+LangGraph is inspired by [Pregel](https://research.google/pubs/pub37252/) and [Apache Beam](https://beam.apache.org/). The public interface draws inspiration from [NetworkX](https://networkx.org/documentation/latest/). LangGraph is built by LangChain Inc, the creators of LangChain, but can be used without LangChain.
+
+### Why use LangGraph?
+
+LangGraph powers [production-grade agents](https://www.langchain.com/built-with-langgraph), trusted by Linkedin, Uber, Klarna, GitLab, and many more. LangGraph provides fine-grained control over both the flow and state of your agent applications. It implements a central [persistence layer](https://langchain-ai.github.io/langgraph/concepts/persistence/), enabling features that are common to most agent architectures:
+
+- **Memory**: LangGraph persists arbitrary aspects of your application's state,
+supporting memory of conversations and other updates within and across user
+interactions;
+- **Human-in-the-loop**: Because state is checkpointed, execution can be interrupted
+and resumed, allowing for decisions, validation, and corrections at key stages via
+human input.
+
+Standardizing these components allows individuals and teams to focus on the behavior
+of their agent, instead of its supporting infrastructure.
+
+Through [LangGraph Platform](#langgraph-platform), LangGraph also provides tooling for
+the development, deployment, debugging, and monitoring of your applications.
+
+LangGraph integrates seamlessly with
+[LangChain](https://python.langchain.com/docs/introduction/) and
+[LangSmith](https://docs.smith.langchain.com/) (but does not require them).
+
+To learn more about LangGraph, check out our first LangChain Academy
+course, *Introduction to LangGraph*, available for free
+[here](https://academy.langchain.com/courses/intro-to-langgraph).
+
+### LangGraph Platform
+
+[LangGraph Platform](https://langchain-ai.github.io/langgraph/concepts/langgraph_platform) is infrastructure for deploying LangGraph agents. It is a commercial solution for deploying agentic applications to production, built on the open-source LangGraph framework. The LangGraph Platform consists of several components that work together to support the development, deployment, debugging, and monitoring of LangGraph applications: [LangGraph Server](https://langchain-ai.github.io/langgraph/concepts/langgraph_server) (APIs), [LangGraph SDKs](https://langchain-ai.github.io/langgraph/concepts/sdk) (clients for the APIs), [LangGraph CLI](https://langchain-ai.github.io/langgraph/concepts/langgraph_cli) (command line tool for building the server), and [LangGraph Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio) (UI/debugger).
+
+See deployment options [here](https://langchain-ai.github.io/langgraph/concepts/deployment_options/)
+(includes a free tier).
+
+Here are some common issues that arise in complex deployments, which LangGraph Platform addresses:
+
+- **Streaming support**: LangGraph Server provides [multiple streaming modes](https://langchain-ai.github.io/langgraph/concepts/streaming) optimized for various application needs
+- **Background runs**: Runs agents asynchronously in the background
+- **Support for long running agents**: Infrastructure that can handle long running processes
+- **[Double texting](https://langchain-ai.github.io/langgraph/concepts/double_texting)**: Handle the case where you get two messages from the user before the agent can respond
+- **Handle burstiness**: Task queue for ensuring requests are handled consistently without loss, even under heavy loads
+
+## Installation
+
+```shell
 pip install -U langgraph
 ```
 
-> [!TIP]
-> If you're looking to quickly build agents, check out **[Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview)** — a higher-level package built on LangGraph for agents that can plan, use subagents, and leverage file systems for complex tasks.
+## Example
 
-For an equivalent JS/TS library, check out [LangGraph.js](https://github.com/langchain-ai/langgraphjs) and the [JS docs](https://docs.langchain.com/oss/javascript/langgraph/overview).
+Let's build a tool-calling [ReAct-style](https://langchain-ai.github.io/langgraph/concepts/agentic_concepts/#react-implementation) agent that uses a search tool!
 
-## Why use LangGraph?
+```shell
+pip install langchain-anthropic
+```
 
-LangGraph provides low-level supporting infrastructure for *any* long-running, stateful workflow or agent:
+```shell
+export ANTHROPIC_API_KEY=sk-...
+```
 
-- **[Durable execution](https://docs.langchain.com/oss/python/langgraph/durable-execution)** — Build agents that persist through failures and can run for extended periods, automatically resuming from exactly where they left off.
-- **[Human-in-the-loop](https://docs.langchain.com/oss/python/langgraph/interrupts)** — Seamlessly incorporate human oversight by inspecting and modifying agent state at any point during execution.
-- **[Comprehensive memory](https://docs.langchain.com/oss/python/langgraph/memory)** — Create truly stateful agents with both short-term working memory for ongoing reasoning and long-term persistent memory across sessions.
-- **[Debugging with LangSmith](https://www.langchain.com/langsmith)** — Gain deep visibility into complex agent behavior with visualization tools that trace execution paths, capture state transitions, and provide detailed runtime metrics.
-- **[Production-ready deployment](https://docs.langchain.com/langsmith/deployments)** — Deploy sophisticated agent systems confidently with scalable infrastructure designed to handle the unique challenges of stateful, long-running workflows.
+Optionally, we can set up [LangSmith](https://docs.smith.langchain.com/) for best-in-class observability.
+
+```shell
+export LANGSMITH_TRACING=true
+export LANGSMITH_API_KEY=lsv2_sk_...
+```
+
+The simplest way to create a tool-calling agent in LangGraph is to use `create_react_agent`:
+
+<details open>
+  <summary>High-level implementation</summary>
+
+```python
+from langgraph.prebuilt import create_react_agent
+from langgraph.checkpoint.memory import MemorySaver
+from langchain_anthropic import ChatAnthropic
+from langchain_core.tools import tool
+
+# Define the tools for the agent to use
+@tool
+def search(query: str):
+    """Call to surf the web."""
+    # This is a placeholder, but don't tell the LLM that...
+    if "sf" in query.lower() or "san francisco" in query.lower():
+        return "It's 60 degrees and foggy."
+    return "It's 90 degrees and sunny."
+
+
+tools = [search]
+model = ChatAnthropic(model="claude-3-5-sonnet-latest", temperature=0)
+
+# Initialize memory to persist state between graph runs
+checkpointer = MemorySaver()
+
+app = create_react_agent(model, tools, checkpointer=checkpointer)
+
+# Use the agent
+final_state = app.invoke(
+    {"messages": [{"role": "user", "content": "what is the weather in sf"}]},
+    config={"configurable": {"thread_id": 42}}
+)
+final_state["messages"][-1].content
+```
+```
+"Based on the search results, I can tell you that the current weather in San Francisco is:\n\nTemperature: 60 degrees Fahrenheit\nConditions: Foggy\n\nSan Francisco is known for its microclimates and frequent fog, especially during the summer months. The temperature of 60°F (about 15.5°C) is quite typical for the city, which tends to have mild temperatures year-round. The fog, often referred to as "Karl the Fog" by locals, is a characteristic feature of San Francisco\'s weather, particularly in the mornings and evenings.\n\nIs there anything else you\'d like to know about the weather in San Francisco or any other location?"
+```
+
+Now when we pass the same <code>"thread_id"</code>, the conversation context is retained via the saved state (i.e. stored list of messages)
+
+```python
+final_state = app.invoke(
+    {"messages": [{"role": "user", "content": "what about ny"}]},
+    config={"configurable": {"thread_id": 42}}
+)
+final_state["messages"][-1].content
+```
+
+```
+"Based on the search results, I can tell you that the current weather in New York City is:\n\nTemperature: 90 degrees Fahrenheit (approximately 32.2 degrees Celsius)\nConditions: Sunny\n\nThis weather is quite different from what we just saw in San Francisco. New York is experiencing much warmer temperatures right now. Here are a few points to note:\n\n1. The temperature of 90°F is quite hot, typical of summer weather in New York City.\n2. The sunny conditions suggest clear skies, which is great for outdoor activities but also means it might feel even hotter due to direct sunlight.\n3. This kind of weather in New York often comes with high humidity, which can make it feel even warmer than the actual temperature suggests.\n\nIt's interesting to see the stark contrast between San Francisco's mild, foggy weather and New York's hot, sunny conditions. This difference illustrates how varied weather can be across different parts of the United States, even on the same day.\n\nIs there anything else you'd like to know about the weather in New York or any other location?"
+```
+</details>
 
 > [!TIP]
-> For developing, debugging, and deploying AI agents and LLM applications, see [LangSmith](https://docs.langchain.com/langsmith/home).
+> LangGraph is a **low-level** framework that allows you to implement any custom agent
+architectures. Click on the low-level implementation below to see how to implement a
+tool-calling agent from scratch.
 
-## LangGraph ecosystem
+<details>
+<summary>Low-level implementation</summary>
 
-While LangGraph can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools for building agents.
+```python
+from typing import Literal
 
-To improve your LLM application development, pair LangGraph with:
+from langchain_anthropic import ChatAnthropic
+from langchain_core.tools import tool
+from langgraph.checkpoint.memory import MemorySaver
+from langgraph.graph import END, START, StateGraph, MessagesState
+from langgraph.prebuilt import ToolNode
 
-- [Deep Agents](https://docs.langchain.com/oss/python/deepagents/overview) – Build agents that can plan, use subagents, and leverage file systems for complex tasks.
-- [LangChain](https://docs.langchain.com/oss/python/langchain/overview) – Provides integrations and composable components to streamline LLM application development.
-- [LangSmith](https://www.langchain.com/langsmith) – Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
-- [LangSmith Deployment](https://docs.langchain.com/langsmith/deployments) – Deploy and scale agents effortlessly with a purpose-built deployment platform for long-running, stateful workflows. Discover, reuse, configure, and share agents across teams – and iterate quickly with visual prototyping in [LangSmith Studio](https://docs.langchain.com/langsmith/studio).
 
----
+# Define the tools for the agent to use
+@tool
+def search(query: str):
+    """Call to surf the web."""
+    # This is a placeholder, but don't tell the LLM that...
+    if "sf" in query.lower() or "san francisco" in query.lower():
+        return "It's 60 degrees and foggy."
+    return "It's 90 degrees and sunny."
+
+
+tools = [search]
+
+tool_node = ToolNode(tools)
+
+model = ChatAnthropic(model="claude-3-5-sonnet-latest", temperature=0).bind_tools(tools)
+
+# Define the function that determines whether to continue or not
+def should_continue(state: MessagesState) -> Literal["tools", END]:
+    messages = state['messages']
+    last_message = messages[-1]
+    # If the LLM makes a tool call, then we route to the "tools" node
+    if last_message.tool_calls:
+        return "tools"
+    # Otherwise, we stop (reply to the user)
+    return END
+
+
+# Define the function that calls the model
+def call_model(state: MessagesState):
+    messages = state['messages']
+    response = model.invoke(messages)
+    # We return a list, because this will get added to the existing list
+    return {"messages": [response]}
+
+
+# Define a new graph
+workflow = StateGraph(MessagesState)
+
+# Define the two nodes we will cycle between
+workflow.add_node("agent", call_model)
+workflow.add_node("tools", tool_node)
+
+# Set the entrypoint as `agent`
+# This means that this node is the first one called
+workflow.add_edge(START, "agent")
+
+# We now add a conditional edge
+workflow.add_conditional_edges(
+    # First, we define the start node. We use `agent`.
+    # This means these are the edges taken after the `agent` node is called.
+    "agent",
+    # Next, we pass in the function that will determine which node is called next.
+    should_continue,
+)
+
+# We now add a normal edge from `tools` to `agent`.
+# This means that after `tools` is called, `agent` node is called next.
+workflow.add_edge("tools", 'agent')
+
+# Initialize memory to persist state between graph runs
+checkpointer = MemorySaver()
+
+# Finally, we compile it!
+# This compiles it into a LangChain Runnable,
+# meaning you can use it as you would any other runnable.
+# Note that we're (optionally) passing the memory when compiling the graph
+app = workflow.compile(checkpointer=checkpointer)
+
+# Use the agent
+final_state = app.invoke(
+    {"messages": [{"role": "user", "content": "what is the weather in sf"}]},
+    config={"configurable": {"thread_id": 42}}
+)
+final_state["messages"][-1].content
+```
+
+<b>Step-by-step Breakdown</b>:
+
+<details>
+<summary>Initialize the model and tools.</summary>
+<ul>
+  <li>
+    We use <code>ChatAnthropic</code> as our LLM. <strong>NOTE:</strong> we need to make sure the model knows that it has these tools available to call. We can do this by converting the LangChain tools into the format for OpenAI tool calling using the <code>.bind_tools()</code> method.
+  </li>
+  <li>
+    We define the tools we want to use - a search tool in our case. It is really easy to create your own tools - see documentation here on how to do that <a href="https://python.langchain.com/docs/how_to/custom_tools/">here</a>.
+  </li>
+</ul>
+</details>
+
+<details>
+<summary>Initialize graph with state.</summary>
+
+<ul>
+    <li>We initialize graph (<code>StateGraph</code>) by passing state schema (in our case <code>MessagesState</code>)</li>
+    <li><code>MessagesState</code> is a prebuilt state schema that has one attribute -- a list of LangChain <code>Message</code> objects, as well as logic for merging the updates from each node into the state.</li>
+</ul>
+</details>
+
+<details>
+<summary>Define graph nodes.</summary>
+
+There are two main nodes we need:
+
+<ul>
+    <li>The <code>agent</code> node: responsible for deciding what (if any) actions to take.</li>
+    <li>The <code>tools</code> node that invokes tools: if the agent decides to take an action, this node will then execute that action.</li>
+</ul>
+</details>
+
+<details>
+<summary>Define entry point and graph edges.</summary>
+
+First, we need to set the entry point for graph execution - <code>agent</code> node.
+
+Then we define one normal and one conditional edge. Conditional edge means that the destination depends on the contents of the graph's state (<code>MessagesState</code>). In our case, the destination is not known until the agent (LLM) decides.
+
+<ul>
+  <li>Conditional edge: after the agent is called, we should either:
+    <ul>
+      <li>a. Run tools if the agent said to take an action, OR</li>
+      <li>b. Finish (respond to the user) if the agent did not ask to run tools</li>
+    </ul>
+  </li>
+  <li>Normal edge: after the tools are invoked, the graph should always return to the agent to decide what to do next</li>
+</ul>
+</details>
+
+<details>
+<summary>Compile the graph.</summary>
+
+<ul>
+  <li>
+    When we compile the graph, we turn it into a LangChain 
+    <a href="https://python.langchain.com/docs/concepts/runnables/">Runnable</a>, 
+    which automatically enables calling <code>.invoke()</code>, <code>.stream()</code> and <code>.batch()</code> 
+    with your inputs
+  </li>
+  <li>
+    We can also optionally pass checkpointer object for persisting state between graph runs, and enabling memory, 
+    human-in-the-loop workflows, time travel and more. In our case we use <code>MemorySaver</code> - 
+    a simple in-memory checkpointer
+  </li>
+</ul>
+</details>
+
+<details>
+<summary>Execute the graph.</summary>
+
+<ol>
+  <li>LangGraph adds the input message to the internal state, then passes the state to the entrypoint node, <code>"agent"</code>.</li>
+  <li>The <code>"agent"</code> node executes, invoking the chat model.</li>
+  <li>The chat model returns an <code>AIMessage</code>. LangGraph adds this to the state.</li>
+  <li>Graph cycles the following steps until there are no more <code>tool_calls</code> on <code>AIMessage</code>:
+    <ul>
+      <li>If <code>AIMessage</code> has <code>tool_calls</code>, <code>"tools"</code> node executes</li>
+      <li>The <code>"agent"</code> node executes again and returns <code>AIMessage</code></li>
+    </ul>
+  </li>
+  <li>Execution progresses to the special <code>END</code> value and outputs the final state. And as a result, we get a list of all our chat messages as output.</li>
+</ol>
+</details>
+
+</details>
 
 ## Documentation
 
-- [docs.langchain.com](https://docs.langchain.com/oss/python/langgraph/overview) – Comprehensive documentation, including conceptual overviews and guides
-- [reference.langchain.com/python/langgraph](https://reference.langchain.com/python/langgraph) – API reference docs for LangGraph packages
-- [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart) – Get started building with LangGraph
-- [Chat LangChain](https://chat.langchain.com/) – Chat with the LangChain documentation and get answers to your questions
+* [Tutorials](https://langchain-ai.github.io/langgraph/tutorials/): Learn to build with LangGraph through guided examples.
+* [How-to Guides](https://langchain-ai.github.io/langgraph/how-tos/): Accomplish specific things within LangGraph, from streaming, to adding memory & persistence, to common design patterns (branching, subgraphs, etc.), these are the place to go if you want to copy and run a specific code snippet.
+* [Conceptual Guides](https://langchain-ai.github.io/langgraph/concepts/high_level/): In-depth explanations of the key concepts and principles behind LangGraph, such as nodes, edges, state and more.
+* [API Reference](https://langchain-ai.github.io/langgraph/reference/graphs/): Review important classes and methods, simple examples of how to use the graph and checkpointing APIs, higher-level prebuilt components and more.
+* [LangGraph Platform](https://langchain-ai.github.io/langgraph/concepts/#langgraph-platform): LangGraph Platform is a commercial solution for deploying agentic applications in production, built on the open-source LangGraph framework.
 
-**Discussions**: Visit the [LangChain Forum](https://forum.langchain.com) to connect with the community and share all of your technical questions, ideas, and feedback.
+## Resources
 
-## Additional resources
+* [Built with LangGraph](https://www.langchain.com/built-with-langgraph): Hear how industry leaders use LangGraph to ship powerful, production-ready AI applications.
 
-- **[Guides](https://docs.langchain.com/oss/python/learn)** – Quick, actionable code snippets for topics such as streaming, adding memory & persistence, and design patterns (e.g. branching, subgraphs, etc.).
-- **[LangChain Academy](https://academy.langchain.com/courses/intro-to-langgraph)** – Learn the basics of LangGraph in our free, structured course.
-- **[Case studies](https://www.langchain.com/built-with-langgraph)** – Hear how industry leaders use LangGraph to ship AI applications at scale.
-- [Contributing Guide](https://docs.langchain.com/oss/python/contributing/overview) – Learn how to contribute to LangChain projects and find good first issues.
-- [Code of Conduct](https://github.com/langchain-ai/langchain/?tab=coc-ov-file) – Our community guidelines and standards for participation.
+## Contributing
 
----
-
-## Acknowledgements
-
-LangGraph is inspired by [Pregel](https://research.google/pubs/pub37252/) and [Apache Beam](https://beam.apache.org/). The public interface draws inspiration from [NetworkX](https://networkx.org/documentation/latest/). LangGraph is built by LangChain Inc, the creators of LangChain, but can be used without LangChain.
+For more information on how to contribute, see [here](https://github.com/langchain-ai/langgraph/blob/main/CONTRIBUTING.md).

docs/.gitignore

@@ -1 +0,0 @@
-_site/

docs/generate_redirects.py

@@ -1,142 +0,0 @@
-#!/usr/bin/env python3
-"""
-Generate HTML redirect files from redirects.json.
-
-Usage:
-    python generate_redirects.py
-
-This script reads redirects.json and generates individual HTML files
-for each redirect path. Each HTML file uses meta refresh (0 delay)
-which is SEO-friendly and treated similarly to 301 redirects by Google.
-
-To add new redirects, simply edit redirects.json and re-run this script.
-"""
-
-import json
-import os
-from pathlib import Path
-
-# Default fallback URL for any path not in the redirect map
-DEFAULT_REDIRECT = "https://docs.langchain.com/oss/python/langgraph/overview"
-
-HTML_TEMPLATE = """<!doctype html>
-<html lang="en">
-<head>
-    <meta charset="utf-8">
-    <title>Redirecting...</title>
-    <link rel="canonical" href="{url}">
-    <meta name="robots" content="noindex">
-    <script>var anchor=window.location.hash.substr(1);location.href="{url}"+(anchor?"#"+anchor:"")</script>
-    <meta http-equiv="refresh" content="0; url={url}">
-</head>
-<body>
-Redirecting...
-</body>
-</html>
-"""
-
-ROOT_HTML_TEMPLATE = """<!doctype html>
-<html lang="en">
-<head>
-    <meta charset="utf-8">
-    <title>Redirecting to LangGraph Documentation</title>
-    <link rel="canonical" href="{url}">
-    <meta name="robots" content="noindex">
-    <script>var anchor=window.location.hash.substr(1);location.href="{url}"+(anchor?"#"+anchor:"")</script>
-    <meta http-equiv="refresh" content="0; url={url}">
-</head>
-<body>
-<h1>Documentation has moved</h1>
-<p>The LangGraph documentation has moved to <a href="{url}">docs.langchain.com</a>.</p>
-<p>Redirecting you now...</p>
-</body>
-</html>
-"""
-
-CATCHALL_404_TEMPLATE = """<!doctype html>
-<html lang="en">
-<head>
-    <meta charset="utf-8">
-    <title>Redirecting to LangGraph Documentation</title>
-    <link rel="canonical" href="{default_url}">
-    <meta name="robots" content="noindex">
-    <script>
-        // Catchall redirect for any unmapped paths
-        window.location.replace("{default_url}");
-    </script>
-    <meta http-equiv="refresh" content="0; url={default_url}">
-</head>
-<body>
-<h1>Documentation has moved</h1>
-<p>The LangGraph documentation has moved to <a href="{default_url}">docs.langchain.com</a>.</p>
-<p>Redirecting you now...</p>
-</body>
-</html>
-"""
-
-
-def generate_redirects():
-    script_dir = Path(__file__).parent
-    output_dir = script_dir / "_site"
-
-    # Load redirects
-    with open(script_dir / "redirects.json") as f:
-        redirects = json.load(f)
-
-    # Clean output directory
-    if output_dir.exists():
-        import shutil
-        shutil.rmtree(output_dir)
-    output_dir.mkdir(parents=True)
-
-    # Generate individual HTML files for each redirect
-    for old_path, new_url in redirects.items():
-        # Remove leading slash and create directory structure
-        path = old_path.lstrip("/")
-
-        # Check if path has a file extension (e.g., .txt, .xml)
-        # If so, create the file directly instead of a directory with index.html
-        path_obj = Path(path)
-        has_extension = path_obj.suffix and len(path_obj.suffix) <= 5
-
-        if not path:
-            html_path = output_dir / "index.html"
-        elif has_extension:
-            # For files with extensions, create the file directly
-            html_path = output_dir / path
-        else:
-            # For directory-style URLs, create index.html inside
-            html_path = output_dir / path / "index.html"
-
-        # Create parent directories
-        html_path.parent.mkdir(parents=True, exist_ok=True)
-
-        # Write the redirect HTML
-        html_path.write_text(HTML_TEMPLATE.format(url=new_url))
-        print(f"Created: {html_path}")
-
-    # Create root index.html
-    root_index = output_dir / "index.html"
-    if not root_index.exists():
-        root_index.write_text(ROOT_HTML_TEMPLATE.format(url=DEFAULT_REDIRECT))
-        print(f"Created: {root_index}")
-
-    # Create 404.html for catchall
-    catchall_404 = output_dir / "404.html"
-    catchall_404.write_text(CATCHALL_404_TEMPLATE.format(default_url=DEFAULT_REDIRECT))
-    print(f"Created: {catchall_404}")
-
-    # Copy static files (like llms.txt) that can't be redirected via HTML
-    static_files = ["llms.txt"]
-    for static_file in static_files:
-        src = script_dir / static_file
-        if src.exists():
-            dst = output_dir / static_file
-            dst.write_text(src.read_text())
-            print(f"Copied: {dst}")
-
-    print(f"\nGenerated {len(redirects)} redirect files in {output_dir}")
-
-
-if __name__ == "__main__":
-    generate_redirects()

docs/llms.txt

@@ -1,35 +0,0 @@
-# LangGraph
-
-LangGraph documentation has moved to docs.langchain.com.
-
-## Overview
-
-- [LangGraph Overview](https://docs.langchain.com/oss/python/langgraph/overview): Introduction to LangGraph, a library for building stateful, multi-actor applications with LLMs.
-- [Why LangGraph?](https://docs.langchain.com/oss/python/langgraph/why-langgraph): Motivation for LangGraph and its key features.
-
-## Core Concepts
-
-- [Graph API](https://docs.langchain.com/oss/python/langgraph/graph-api): Learn how to define state, create nodes, and connect them with edges.
-- [Streaming](https://docs.langchain.com/oss/python/langgraph/streaming): Stream outputs from your graph for better UX.
-- [Persistence](https://docs.langchain.com/oss/python/langgraph/persistence): Add memory and checkpointing to your graphs.
-- [Add Memory](https://docs.langchain.com/oss/python/langgraph/add-memory): Implement short-term and long-term memory.
-- [Workflows & Agents](https://docs.langchain.com/oss/python/langgraph/workflows-agents): Build agents and workflows with LangGraph.
-
-## How-To Guides
-
-- [Use Subgraphs](https://docs.langchain.com/oss/python/langgraph/use-subgraphs): Compose graphs using subgraphs.
-- [Observability](https://docs.langchain.com/oss/python/langgraph/observability): Add tracing and debugging to your graphs.
-- [Common Errors](https://docs.langchain.com/oss/python/langgraph/common-errors): Troubleshoot common LangGraph errors.
-
-## Tutorials
-
-- [Agentic RAG](https://docs.langchain.com/oss/python/langgraph/agentic-rag): Build an agentic RAG system with LangGraph.
-- [SQL Agent](https://docs.langchain.com/oss/python/langgraph/sql-agent): Create a SQL agent with LangGraph.
-
-## Reference
-
-- [API Reference](https://reference.langchain.com/python/langgraph/): Complete API documentation for LangGraph.
-
-## LangGraph Platform
-
-For deploying LangGraph applications in production, see the [LangSmith documentation](https://docs.langchain.com/langsmith/agent-server).

docs/redirects.json

@@ -1,296 +0,0 @@
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-  "/agents/multi-agent": "https://docs.langchain.com/oss/python/langchain/multi-agent",
-  "/how-tos/multi_agent": "https://docs.langchain.com/oss/python/langgraph/graph-api",
-  "/concepts/mcp": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/agents/mcp": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/concepts/tracing": "https://docs.langchain.com/oss/python/langgraph/observability",
-  "/how-tos/enable-tracing": "https://docs.langchain.com/oss/python/langgraph/observability",
-  "/agents/evals": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/concepts/template_applications": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/rag/langgraph_agentic_rag": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
-  "/tutorials/multi_agent/agent_supervisor": "https://docs.langchain.com/oss/python/langgraph/workflows-agents",
-  "/tutorials/sql/sql-agent": "https://docs.langchain.com/oss/python/langgraph/sql-agent",
-  "/agents/ui": "https://docs.langchain.com/oss/python/langgraph/ui",
-  "/how-tos/run-id-langsmith": "https://docs.langchain.com/oss/python/langgraph/observability",
-  "/troubleshooting/errors/index": "https://docs.langchain.com/oss/python/langgraph/common-errors",
-  "/troubleshooting/errors/INVALID_CHAT_HISTORY": "https://docs.langchain.com/oss/python/langgraph/INVALID_CHAT_HISTORY",
-  "/troubleshooting/errors/INVALID_LICENSE": "https://docs.langchain.com/oss/python/langgraph/common-errors",
-  "/adopters": "https://docs.langchain.com/oss/python/langgraph/case-studies",
-  "/concepts/faq": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/agents/prebuilt": "https://docs.langchain.com/oss/python/langchain/agents",
-  "/reference/index": "https://reference.langchain.com/python/langgraph/",
-  "/reference/graphs": "https://reference.langchain.com/python/langgraph/graphs/",
-  "/reference/func": "https://reference.langchain.com/python/langgraph/func/",
-  "/reference/pregel": "https://reference.langchain.com/python/langgraph/pregel/",
-  "/reference/checkpoints": "https://reference.langchain.com/python/langgraph/checkpoints/",
-  "/reference/store": "https://reference.langchain.com/python/langgraph/store/",
-  "/reference/cache": "https://reference.langchain.com/python/langgraph/cache/",
-  "/reference/types": "https://reference.langchain.com/python/langgraph/types/",
-  "/reference/runtime": "https://reference.langchain.com/python/langgraph/runtime/",
-  "/reference/config": "https://reference.langchain.com/python/langgraph/config/",
-  "/reference/errors": "https://reference.langchain.com/python/langgraph/errors/",
-  "/reference/constants": "https://reference.langchain.com/python/langgraph/constants/",
-  "/reference/channels": "https://reference.langchain.com/python/langgraph/channels/",
-  "/reference/agents": "https://reference.langchain.com/python/langgraph/agents/",
-  "/reference/supervisor": "https://reference.langchain.com/python/langgraph/supervisor/",
-  "/reference/swarm": "https://reference.langchain.com/python/langgraph/swarm/",
-  "/reference/mcp": "https://reference.langchain.com/python/langgraph/mcp/",
-  "/cloud/reference/sdk/python_sdk_ref": "https://reference.langchain.com/python/langsmith/deployment/sdk/",
-  "/reference/remote_graph": "https://reference.langchain.com/python/langsmith/deployment/remote_graph/",
-  "/additional-resources/index": "https://docs.langchain.com/oss/python/langchain/overview",
-  "/cloud/reference/sdk/js_ts_sdk_ref": "https://reference.langchain.com/javascript/modules/langsmith.html",
-  "/snippets/chat_model_tabs": "https://docs.langchain.com/oss/python/langchain/overview",
-  "/troubleshooting/errors/GRAPH_RECURSION_LIMIT": "https://docs.langchain.com/oss/python/langgraph/GRAPH_RECURSION_LIMIT",
-  "/troubleshooting/errors/INVALID_CONCURRENT_GRAPH_UPDATE": "https://docs.langchain.com/oss/python/langgraph/INVALID_CONCURRENT_GRAPH_UPDATE",
-  "/troubleshooting/errors/INVALID_GRAPH_NODE_RETURN_VALUE": "https://docs.langchain.com/oss/python/langgraph/INVALID_GRAPH_NODE_RETURN_VALUE",
-  "/troubleshooting/errors/MULTIPLE_SUBGRAPHS": "https://docs.langchain.com/oss/python/langgraph/MULTIPLE_SUBGRAPHS",
-  "/tutorials/rag/langgraph_self_rag": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
-  "/additional-resources": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/examples": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/guides": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/how-tos/autogen-integration-functional": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/how-tos/cross-thread-persistence-functional": "https://docs.langchain.com/oss/python/langgraph/add-memory#add-long-term-memory",
-  "/how-tos/disable-streaming": "https://docs.langchain.com/oss/python/langgraph/streaming",
-  "/how-tos/memory/semantic-search": "https://docs.langchain.com/oss/python/langgraph/add-memory",
-  "/how-tos/multi-agent-multi-turn-convo-functional": "https://docs.langchain.com/oss/python/langgraph/graph-api",
-  "/how-tos/multi-agent-network-functional": "https://docs.langchain.com/oss/python/langgraph/graph-api",
-  "/how-tos/persistence-functional": "https://docs.langchain.com/oss/python/langgraph/add-memory",
-  "/how-tos/react-agent-from-scratch-functional": "https://docs.langchain.com/oss/python/langgraph/workflows-agents",
-  "/reference": "https://reference.langchain.com/python/langgraph/",
-  "/troubleshooting/errors": "https://docs.langchain.com/oss/python/langgraph/common-errors",
-  "/tutorials/chatbot-simulation-evaluation/agent-simulation-evaluation": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/chatbot-simulation-evaluation/langsmith-agent-simulation-evaluation": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/chatbots/information-gather-prompting": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/extraction/retries": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/langgraph-platform/local-server": "https://docs.langchain.com/langsmith/agent-server",
-  "/tutorials/lats/lats": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/llm-compiler/LLMCompiler": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/rag/langgraph_adaptive_rag_local": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
-  "/tutorials/rag/langgraph_crag": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
-  "/tutorials/rag/langgraph_crag_local": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
-  "/tutorials/rag/langgraph_self_rag_local": "https://docs.langchain.com/oss/python/langgraph/agentic-rag",
-  "/tutorials/reflection/reflection": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/reflexion/reflexion": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/rewoo/rewoo": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/self-discover/self-discover": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/tnt-llm/tnt-llm": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/tot/tot": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/usaco/usaco": "https://docs.langchain.com/oss/python/langgraph/overview",
-  "/tutorials/web-navigation/web_voyager": "https://docs.langchain.com/oss/python/langgraph/overview"
-}

examples/README.md

@@ -1,11 +0,0 @@
-# LangGraph examples
-
-This directory is retained purely for archival purposes and is no longer updated.
-
-## 🤔 What is this?
-
-The examples previously found here have been moved to the consolidated LangChain documentation. This directory remains available for historical reference, but new examples and usage guidance are published in the docs.
-
-## 📖 Documentation
-
-For up-to-date LangGraph examples, tutorials, and guides, see the [LangGraph Docs](https://docs.langchain.com/oss/python/langgraph/overview). Get started with the [LangGraph Quickstart](https://docs.langchain.com/oss/python/langgraph/quickstart).

examples/chatbot-simulation-evaluation/agent-simulation-evaluation.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "10251c1c",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/chatbot-simulation-evaluation/agent-simulation-evaluation.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "c5fc63df",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.1"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/chatbot-simulation-evaluation/langsmith-agent-simulation-evaluation.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "a4351a24",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/chatbot-simulation-evaluation/langsmith-agent-simulation-evaluation.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "4cc9af1e",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/chatbot-simulation-evaluation/simulation_utils.py

@@ -1,203 +0,0 @@
-import functools
-from typing import Annotated, Any, Callable, Dict, List, Optional, Union
-
-from langchain_community.adapters.openai import convert_message_to_dict
-from langchain_core.messages import AIMessage, AnyMessage, BaseMessage, HumanMessage
-from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder
-from langchain_core.runnables import Runnable, RunnableLambda
-from langchain_core.runnables import chain as as_runnable
-from langchain_openai import ChatOpenAI
-from typing_extensions import TypedDict
-
-from langgraph.graph import END, StateGraph, START
-
-
-def langchain_to_openai_messages(messages: List[BaseMessage]):
-    """
-    Convert a list of langchain base messages to a list of openai messages.
-
-    Parameters:
-        messages (List[BaseMessage]): A list of langchain base messages.
-
-    Returns:
-        List[dict]: A list of openai messages.
-    """
-
-    return [
-        convert_message_to_dict(m) if isinstance(m, BaseMessage) else m
-        for m in messages
-    ]
-
-
-def create_simulated_user(
-    system_prompt: str, llm: Runnable | None = None
-) -> Runnable[Dict, AIMessage]:
-    """
-    Creates a simulated user for chatbot simulation.
-
-    Args:
-        system_prompt (str): The system prompt to be used by the simulated user.
-        llm (Runnable | None, optional): The language model to be used for the simulation.
-            Defaults to gpt-3.5-turbo.
-
-    Returns:
-        Runnable[Dict, AIMessage]: The simulated user for chatbot simulation.
-    """
-    return ChatPromptTemplate.from_messages(
-        [
-            ("system", system_prompt),
-            MessagesPlaceholder(variable_name="messages"),
-        ]
-    ) | (llm or ChatOpenAI(model="gpt-3.5-turbo")).with_config(
-        run_name="simulated_user"
-    )
-
-
-Messages = Union[list[AnyMessage], AnyMessage]
-
-
-def add_messages(left: Messages, right: Messages) -> Messages:
-    if not isinstance(left, list):
-        left = [left]
-    if not isinstance(right, list):
-        right = [right]
-    return left + right
-
-
-class SimulationState(TypedDict):
-    """
-    Represents the state of a simulation.
-
-    Attributes:
-        messages (List[AnyMessage]): A list of messages in the simulation.
-        inputs (Optional[dict[str, Any]]): Optional inputs for the simulation.
-    """
-
-    messages: Annotated[List[AnyMessage], add_messages]
-    inputs: Optional[dict[str, Any]]
-
-
-def create_chat_simulator(
-    assistant: (
-        Callable[[List[AnyMessage]], str | AIMessage]
-        | Runnable[List[AnyMessage], str | AIMessage]
-    ),
-    simulated_user: Runnable[Dict, AIMessage],
-    *,
-    input_key: str,
-    max_turns: int = 6,
-    should_continue: Optional[Callable[[SimulationState], str]] = None,
-):
-    """Creates a chat simulator for evaluating a chatbot.
-
-    Args:
-        assistant: The chatbot assistant function or runnable object.
-        simulated_user: The simulated user object.
-        input_key: The key for the input to the chat simulation.
-        max_turns: The maximum number of turns in the chat simulation. Default is 6.
-        should_continue: Optional function to determine if the simulation should continue.
-            If not provided, a default function will be used.
-
-    Returns:
-        The compiled chat simulation graph.
-
-    """
-    graph_builder = StateGraph(SimulationState)
-    graph_builder.add_node(
-        "user",
-        _create_simulated_user_node(simulated_user),
-    )
-    graph_builder.add_node(
-        "assistant", _fetch_messages | assistant | _coerce_to_message
-    )
-    graph_builder.add_edge("assistant", "user")
-    graph_builder.add_conditional_edges(
-        "user",
-        should_continue or functools.partial(_should_continue, max_turns=max_turns),
-    )
-    # If your dataset has a 'leading question/input', then we route first to the assistant, otherwise, we let the user take the lead.
-    graph_builder.add_edge(START, "assistant" if input_key is not None else "user")
-
-    return (
-        RunnableLambda(_prepare_example).bind(input_key=input_key)
-        | graph_builder.compile()
-    )
-
-
-## Private methods
-
-
-def _prepare_example(inputs: dict[str, Any], input_key: Optional[str] = None):
-    if input_key is not None:
-        if input_key not in inputs:
-            raise ValueError(
-                f"Dataset's example input must contain the provided input key: '{input_key}'.\nFound: {list(inputs.keys())}"
-            )
-        messages = [HumanMessage(content=inputs[input_key])]
-        return {
-            "inputs": {k: v for k, v in inputs.items() if k != input_key},
-            "messages": messages,
-        }
-    return {"inputs": inputs, "messages": []}
-
-
-def _invoke_simulated_user(state: SimulationState, simulated_user: Runnable):
-    """Invoke the simulated user node."""
-    runnable = (
-        simulated_user
-        if isinstance(simulated_user, Runnable)
-        else RunnableLambda(simulated_user)
-    )
-    inputs = state.get("inputs", {})
-    inputs["messages"] = state["messages"]
-    return runnable.invoke(inputs)
-
-
-def _swap_roles(state: SimulationState):
-    new_messages = []
-    for m in state["messages"]:
-        if isinstance(m, AIMessage):
-            new_messages.append(HumanMessage(content=m.content))
-        else:
-            new_messages.append(AIMessage(content=m.content))
-    return {
-        "inputs": state.get("inputs", {}),
-        "messages": new_messages,
-    }
-
-
-@as_runnable
-def _fetch_messages(state: SimulationState):
-    """Invoke the simulated user node."""
-    return state["messages"]
-
-
-def _convert_to_human_message(message: BaseMessage):
-    return {"messages": [HumanMessage(content=message.content)]}
-
-
-def _create_simulated_user_node(simulated_user: Runnable):
-    """Simulated user accepts a {"messages": [...]} argument and returns a single message."""
-    return (
-        _swap_roles
-        | RunnableLambda(_invoke_simulated_user).bind(simulated_user=simulated_user)
-        | _convert_to_human_message
-    )
-
-
-def _coerce_to_message(assistant_output: str | BaseMessage):
-    if isinstance(assistant_output, str):
-        return {"messages": [AIMessage(content=assistant_output)]}
-    else:
-        return {"messages": [assistant_output]}
-
-
-def _should_continue(state: SimulationState, max_turns: int = 6):
-    messages = state["messages"]
-    # TODO support other stop criteria
-    if len(messages) > max_turns:
-        return END
-    elif messages[-1].content.strip() == "FINISHED":
-        return END
-    else:
-        return "assistant"

examples/chatbots/information-gather-prompting.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "a9014f94",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/chatbots/information-gather-prompting.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "f47ce992",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/code_assistant/langgraph_code_assistant.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "1f2f13ca",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/code_assistant/langgraph_code_assistant.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "5e4c9bfe",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/customer-support/customer-support.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "a8232bc9",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/customer-support/customer-support.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "63da8671",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/delta-channel-dump/README.md

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

examples/delta-channel-dump/dump.py

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

examples/extraction/retries.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "8dbdba5b",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/extraction/retries.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "1d444b7f",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/human_in_the_loop/wait-user-input.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "3ecab357",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/how-tos/human_in_the_loop/wait-user-input.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "3f2866bd",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/lats/lats.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "09038b53",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/lats/lats.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "b1669748",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/llm-compiler/LLMCompiler.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "85205e97",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/llm-compiler/LLMCompiler.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "2fdab366",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/multi_agent/hierarchical_agent_teams.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "5cc8a2ad",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/multi_agent/hierarchical_agent_teams.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "b9f3508a",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/multi_agent/multi-agent-collaboration.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "d2b507b9",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/multi_agent/multi-agent-collaboration.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "41a8f10a",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/plan-and-execute/plan-and-execute.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "9138f92e",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/plan-and-execute/plan-and-execute.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "093678ba",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/react-agent-from-scratch.ipynb

@@ -1,40 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "294995c4",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/how-tos/react-agent-from-scratch.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 2
-}

examples/react-agent-structured-output.ipynb

@@ -1,40 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "40f0d107",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/how-tos/react-agent-structured-output.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 4
-}

examples/reflection/reflection.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "658773a2",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/reflection/reflection.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "1cb60657",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/reflexion/reflexion.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "caf07859",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/reflexion/reflexion.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "cd1df0e0",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/rewoo/rewoo.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "961f43ec",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/rewoo/rewoo.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "7f00c427",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/run-id-langsmith.ipynb

@@ -1,40 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "bbd6e9b8",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/how-tos/run-id-langsmith.md)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 4
-}

examples/self-discover/self-discover.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "f6db1873",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/self-discover/self-discover.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "219a78f9",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.12.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/subgraph.ipynb

@@ -1,40 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "f49876e1",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/how-tos/subgraph.md)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 4
-}

examples/tool-calling.ipynb

@@ -1,40 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "7fd8bd65",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/how-tos/tool-calling.md)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 4
-}

examples/tutorials/sql-agent.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "83c2223f",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/sql/sql-agent.md)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "57f924b1",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.9"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/tutorials/tnt-llm/tnt-llm.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "11140167",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/tnt-llm/tnt-llm.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "1a2ba3e6",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/usaco/usaco.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "9dffdb54",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/usaco/usaco.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "579c9959",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

examples/web-navigation/web_voyager.ipynb

@@ -1,41 +0,0 @@
-{
- "cells": [
-  {
-   "cell_type": "markdown",
-   "id": "007ea2e9",
-   "metadata": {},
-   "source": [
-    "[This file has been moved](https://github.com/langchain-ai/langgraph/blob/23961cff61a42b52525f3b20b4094d8d2fba1744/docs/docs/tutorials/web-navigation/web_voyager.ipynb)"
-   ]
-  },
-  {
-   "cell_type": "markdown",
-   "id": "f0d7b895",
-   "metadata": {},
-   "source": [
-    "This directory is retained purely for archival purposes and is no longer updated. The examples previously found here have been moved to the newly [consolidated LangChain documentation](https://docs.langchain.com/oss/python/langgraph/overview)."
-   ]
-  }
- ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.11.2"
-  }
- },
- "nbformat": 4,
- "nbformat_minor": 5
-}

langgraph-java/.gitignore

@@ -0,0 +1,90 @@
+##############################
+## Java
+##############################
+.mtj.tmp/
+*.class
+*.jar
+*.war
+*.ear
+*.nar
+hs_err_pid*
+replay_pid*
+
+##############################
+## Maven
+##############################
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+pom.xml.bak
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+
+##############################
+## Gradle
+##############################
+bin/
+build/
+.gradle
+.gradletasknamecache
+gradle-app.setting
+!gradle-wrapper.jar
+
+##############################
+## IntelliJ
+##############################
+out/
+.idea/
+.idea_modules/
+*.iml
+*.ipr
+*.iws
+
+##############################
+## Eclipse
+##############################
+.settings/
+bin/
+tmp/
+.metadata
+.classpath
+.project
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.loadpath
+.factorypath
+
+##############################
+## NetBeans
+##############################
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+
+##############################
+## Visual Studio Code
+##############################
+.vscode/
+.code-workspace
+
+##############################
+## OS X
+##############################
+.DS_Store
+
+##############################
+## Miscellaneous
+##############################
+*.log

langgraph-java/CHANNEL_INITIALIZATION.md

@@ -0,0 +1,107 @@
+# Channel Initialization in Java LangGraph
+
+This document explains how channel initialization is handled in the Java implementation of LangGraph, matching Python's behavior.
+
+## Current Implementation 
+
+### Java Implementation (Python-Compatible)
+
+In the Java implementation:
+
+1. **First Superstep Behavior**:
+   - Only nodes that have the input channel as one of their triggers run in the first superstep
+   - This matches Python's behavior for graph execution
+
+2. **Channel Reading**:
+   - Channels that haven't been initialized return `null` values (instead of throwing exceptions)
+   - Nodes are expected to handle potentially `null` values from uninitialized channels
+
+3. **Graph Execution**:
+   - Subsequent supersteps only execute nodes that:
+     - Subscribe to a channel that was updated
+     - OR have a trigger matching a channel that was updated
+
+## Key Distinctions
+
+There's an important distinction between:
+
+1. **Input channels** - Channels from which the node reads values when it executes
+2. **Trigger channels** - Channels that determine when this node should execute
+
+In our Java implementation:
+- `channels` property defines which channels the node reads from
+- `triggerChannels` property defines which channels can cause the node to execute
+
+This naming is more intuitive and aligns better with the conceptual distinction between reading from a channel and being triggered by a channel.
+
+## Implementation Details
+
+The Python-compatible implementation in Java LangGraph makes the following changes:
+
+1. Modified `TaskPlanner.plan()` to only execute nodes with input channel triggers in the first superstep
+2. Updated tests to:
+   - Add triggers for nodes that should execute on first superstep (e.g., `trigger("input")`)
+   - Remove unnecessary manual channel initialization that was previously used to avoid EmptyChannelException
+   - Use input maps to provide initial values instead of `channel.update()`
+   - Only keep manual initialization in specific test cases that need it (like the mix of initialized/uninitialized channels test)
+3. Clarified the distinction between "subscribe to read" and "trigger to execute" semantics
+
+## Recommended Practices
+
+When building graphs with the Java implementation, follow these practices to ensure Python compatibility:
+
+### 1. Add trigger channels to nodes
+
+Always add appropriate trigger channels to nodes that should execute in the first superstep:
+
+```java
+PregelNode node = new PregelNode.Builder("node", executable)
+    .channel("input")          // Channel to read from
+    .triggerChannel("input")   // Channel that triggers execution 
+    .writer("output")
+    .build();
+```
+
+You can also add multiple trigger channels if needed:
+
+```java
+PregelNode node = new PregelNode.Builder("node", executable)
+    .channel("input1")
+    .channel("input2")
+    .triggerChannel("input1")   // Will trigger on this channel
+    .triggerChannel("input2")   // And also on this channel
+    .writer("output")
+    .build();
+```
+
+### 2. Handle uninitialized channels gracefully
+
+Inside node execution logic, handle potentially uninitialized channels using default values:
+
+```java
+// Handle uninitialized channels with a default value
+Integer input = 0; // Default value for uninitialized channel
+if (inputs.containsKey("inputChannel") && inputs.get("inputChannel") != null) {
+    input = (Integer) inputs.get("inputChannel");
+}
+```
+
+### 3. Provide initial values through input map
+
+Instead of manually initializing channels, provide initial values through the input map:
+
+```java
+// DO NOT do this:
+// channel.update(Collections.singletonList(initialValue));
+
+// Instead, provide values in the input map:
+Map<String, Object> input = new HashMap<>();
+input.put("inputChannel", initialValue);
+Object result = pregel.invoke(input, null);
+```
+
+### 4. Remember execution rules
+
+- Only nodes with input channel as a trigger run in the first superstep
+- In subsequent supersteps, nodes run if they subscribe to or have a trigger matching an updated channel
+- Uninitialized channels return `null` or empty collections rather than throwing exceptions

langgraph-java/PYTHON_JAVA_MAPPING.md

@@ -0,0 +1,88 @@
+# Python-Java Implementation Mapping
+
+This document records the mapping between Python and Java implementations of LangGraph, highlighting any deliberate differences and their rationale.
+
+## Core Components
+
+### Channels
+
+| Component | Python Path | Java Path | Deviations |
+|-----------|-------------|-----------|------------|
+| BaseChannel | langgraph/channels/base.py | com.langgraph.channels.BaseChannel | Java uses interface with default methods instead of Python's abstract base class. Channel returns null or empty values when uninitialized, rather than throwing exceptions. |
+| AbstractChannel | langgraph/channels/base.py | com.langgraph.channels.AbstractChannel | Java implementation provides default functionality shared by channel implementations. Added Python compatibility for uninitialized channels. |
+| TopicChannel | langgraph/channels/topic_channel.py | com.langgraph.channels.TopicChannel | Java implementation preserves Python's multi-value behavior while using Java collections. Returns empty list for uninitialized channels. |
+| LastValue | langgraph/channels/last_value.py | com.langgraph.channels.LastValue | Returns null for uninitialized channels to match Python behavior. |
+| EphemeralValue | langgraph/channels/ephemeral_value.py | com.langgraph.channels.EphemeralValue | Returns null for uninitialized channels to match Python behavior. |
+| Channels (utility) | langgraph/channels/__init__.py | com.langgraph.channels.Channels | Java uses utility class with static methods instead of module-level functions. |
+
+### Pregel Algorithm
+
+| Component | Python Path | Java Path | Deviations |
+|-----------|-------------|-----------|------------|
+| PregelNode | langgraph/pregel/algorithm.py | com.langgraph.pregel.PregelNode | Java exposes these concepts with clearer naming: 'channels' (input channels to read from) and 'triggerChannels' (channels that trigger execution). Java now supports multiple trigger channels like Python. |
+| Pregel | langgraph/pregel/pregel.py | com.langgraph.pregel.Pregel | Java uses Builder pattern instead of Python's initialization parameters. Functionally equivalent. |
+| PregelLoop | langgraph/pregel/pregel_loop.py | com.langgraph.pregel.execute.PregelLoop | Implementation follows Java conventions with robust cycle detection. Ensures runs complete when possible by executing a final validation step before throwing recursion errors. |
+| Runner Functions | langgraph/pregel/runner.py | com.langgraph.pregel.execute.SuperstepManager | Python's functional approach mapped to Java's object-oriented design. |
+| Algorithm Functions | langgraph/pregel/algo.py | Various Java classes | Python's functional approach distributed across several Java classes according to responsibility. |
+| TaskPlanner | langgraph/pregel/algo.py | com.langgraph.pregel.task.TaskPlanner | Java implementation now matches Python: only nodes with the input channel as a trigger execute on first run. See CHANNEL_INITIALIZATION.md for details. |
+
+### Checkpoint
+
+| Component | Python Path | Java Path | Deviations |
+|-----------|-------------|-----------|------------|
+| BaseCheckpointSaver | langgraph/checkpoint/base.py | com.langgraph.checkpoint.base.BaseCheckpointSaver | Java uses interfaces rather than abstract classes where appropriate. |
+| MemoryCheckpointSaver | langgraph/checkpoint/memory.py | com.langgraph.checkpoint.base.memory.MemoryCheckpointSaver | Java implementation uses more type safety but maintains same functionality. |
+| Serializer | langgraph/checkpoint/serde.py | com.langgraph.checkpoint.serde.Serializer | Java uses interface with specific implementations for different serialization approaches. |
+
+## Method-Level Mappings
+
+### PregelLoop (Python: langgraph/pregel/loop.py, Java: com.langgraph.pregel.execute.PregelLoop)
+
+| Python Method | Java Method | Deviations |
+|---------------|-------------|------------|
+| `__init__` | Constructor + Builder pattern | Java uses Builder pattern for more flexible initialization. |
+| `tick` | `execute` | Same core functionality, but with improved recursion detection that matches Python behavior while being more resilient. Java executes a final validation step before throwing recursion errors to ensure runs complete when possible. |
+| `_first` | `initializeWithInput` | Similar initialization logic but with Java-specific patterns. |
+| `stream` | `stream` | Both handle streaming with similar semantics but with improved robustness in Java. Stream mode includes more validation to prevent false recursion errors. |
+| `_put_checkpoint` | `createCheckpoint` | Similar checkpoint creation but with Java-specific implementation. |
+
+### Runner Functions (Python: langgraph/pregel/runner.py)
+
+| Python Function | Java Method | Deviations |
+|-----------------|-------------|------------|
+| `commit` | `SuperstepManager.commit` | Java implementation encapsulates in object instead of standalone function. |
+| `tick` | `SuperstepManager.tick` | Same core functionality but adapted to Java's object-oriented paradigm. |
+
+### Algorithm Functions (Python: langgraph/pregel/algo.py)
+
+| Python Function | Java Method | Deviations |
+|-----------------|-------------|------------|
+| `prepare_next_tasks` | `TaskPlanner.planTasks` | Java implementation encapsulates in object instead of standalone function. |
+| `prepare_single_task` | `TaskPlanner.planSingleTask` | Same approach but with stronger typing in Java. |
+| `apply_writes` | Multiple methods in ChannelRegistry | Java distributes responsibility across specialized classes. |
+
+## Implementation Notes
+
+### General Patterns
+- Java uses more explicit type information compared to Python
+- Builder pattern is used in Java where Python uses parameter initialization
+- Java collections (List, Map) replace Python collections (list, dict)
+- Java follows standard exception hierarchy rather than Python's exception model
+- Python's functional approach is often translated to Java's object-oriented design using objects with state
+- Uninitialized channels in Java return null or empty collections rather than throwing exceptions
+- Nodes in Java follow Python's behavior: only nodes with input channel as a trigger run in the first superstep
+- Both implementations handle uninitialized channels gracefully without requiring manual initialization
+
+### Missing Features (To Be Implemented)
+- Some stream modes are not yet fully implemented in Java
+- Advanced graph features are still under development in Java
+- Some error handling cases need refinement to match Python semantics fully
+
+## When Adding New Components
+When adding new Java classes that correspond to Python implementations:
+1. Add an entry to this document
+2. Document any deviations and justify according to allowed reasons:
+   - Different public interfaces to match Java developer expectations
+   - Different implementation details to match Java stdlib/patterns
+   - Not yet fully implemented Python behavior
+3. Never introduce deviations just to take shortcuts or change behavior

langgraph-java/README.md

@@ -0,0 +1,266 @@
+# LangGraph Java
+
+A Java implementation of the [LangGraph](https://github.com/langchain-ai/langgraph) framework for building stateful, streaming LLM applications.
+
+## Overview
+
+LangGraph Java is designed for building directed, stateful computational graphs suitable for orchestrating LLM-based applications. The framework is particularly useful for:
+
+- Building agents with tools, memory, and planning abilities
+- Creating multi-agent systems with communication channels
+- Implementing retrieval augmented generation (RAG) pipelines
+- Supporting streaming output for responsive UI experiences
+
+Key features:
+
+- **Type-safe execution** with Java generics
+- **Stateful graph execution** with checkpoint persistence
+- **Streaming output** for real-time feedback
+- **Directed computation graphs** with deterministic execution
+
+## Project Structure
+
+- `langgraph-checkpoint`: Base persistence interfaces
+- `langgraph-core`: Main library with channels, Pregel implementation
+- `langgraph-examples`: Example applications
+
+## Requirements
+
+- Java 17 or higher
+- Gradle 7.0 or higher
+
+## Building
+
+```bash
+./gradlew build
+```
+
+## Getting Started
+
+### Basic Example
+
+Here's a simple example that creates a graph with a single node that adds 1 to its input:
+
+```java
+import com.langgraph.channels.LastValue;
+import com.langgraph.pregel.Pregel;
+import com.langgraph.pregel.PregelExecutable;
+import com.langgraph.pregel.PregelNode;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class SimpleExample {
+    public static void main(String[] args) {
+        // Create a node that adds 1 to the input
+        PregelNode<Integer, Integer> node = new PregelNode.Builder<>("adder", 
+            new PregelExecutable<Integer, Integer>() {
+                @Override
+                public Map<String, Integer> execute(Map<String, Integer> inputs, Map<String, Object> context) {
+                    // Get input value, default to 0 if not present
+                    int inputValue = inputs.getOrDefault("input", 0);
+                    
+                    // Return output with value increased by 1
+                    Map<String, Integer> output = new HashMap<>();
+                    output.put("output", inputValue + 1);
+                    return output;
+                }
+            })
+            .channels("input")        // Read from "input" channel
+            .triggerChannels("input") // Triggered by "input" updates
+            .writers("output")        // Write to "output" channel
+            .build();
+        
+        // Create channels
+        Map<String, BaseChannel<?, ?, ?>> channels = new HashMap<>();
+        channels.put("input", LastValue.<Integer>create("input"));
+        channels.put("output", LastValue.<Integer>create("output"));
+        
+        // Create Pregel instance
+        Pregel<Integer, Integer> pregel = new Pregel.Builder<Integer, Integer>()
+                .addNode(node)
+                .addChannels(channels)
+                .build();
+        
+        // Run with input 5
+        Map<String, Integer> input = new HashMap<>();
+        input.put("input", 5);
+        Map<String, Integer> result = pregel.invoke(input, null);
+        
+        // Print result (should be 6)
+        System.out.println("Result: " + result.get("output"));
+    }
+}
+```
+
+### Multi-Step Graph Example
+
+Here's an example of a two-node graph that performs sequential processing:
+
+```java
+import com.langgraph.channels.BaseChannel;
+import com.langgraph.channels.LastValue;
+import com.langgraph.pregel.Pregel;
+import com.langgraph.pregel.PregelExecutable;
+import com.langgraph.pregel.PregelNode;
+
+import java.util.*;
+
+public class SequentialExample {
+    public static void main(String[] args) {
+        // First node: Add 1 to the input and write to intermediate channel
+        PregelNode<Integer, Integer> adder = new PregelNode.Builder<>("adder", 
+            new PregelExecutable<Integer, Integer>() {
+                @Override
+                public Map<String, Integer> execute(Map<String, Integer> inputs, Map<String, Object> context) {
+                    int inputValue = inputs.getOrDefault("input", 0);
+                    System.out.println("Adder received input: " + inputValue);
+                    
+                    // Add 1 to the input value
+                    int result = inputValue + 1;
+                    
+                    // Write to the intermediate channel "state"
+                    Map<String, Integer> output = new HashMap<>();
+                    output.put("state", result);
+                    return output;
+                }
+            })
+            .channels("input")
+            .triggerChannels("input")
+            .writers("state")
+            .build();
+        
+        // Second node: Multiply intermediate value by 2 and write to output
+        PregelNode<Integer, Integer> multiplier = new PregelNode.Builder<>("multiplier", 
+            new PregelExecutable<Integer, Integer>() {
+                @Override
+                public Map<String, Integer> execute(Map<String, Integer> inputs, Map<String, Object> context) {
+                    // Get state value, default to 1 if not present
+                    int stateValue = inputs.getOrDefault("state", 1);
+                    
+                    // Multiply by 2
+                    int result = stateValue * 2;
+                    
+                    // Write to the output channel
+                    Map<String, Integer> output = new HashMap<>();
+                    output.put("output", result);
+                    return output;
+                }
+            })
+            .channels("state")
+            .triggerChannels("state")
+            .writers("output")
+            .build();
+        
+        // Create and configure channels
+        Map<String, BaseChannel<?, ?, ?>> channels = new HashMap<>();
+        channels.put("input", LastValue.<Integer>create("input"));
+        channels.put("state", LastValue.<Integer>create("state"));
+        channels.put("output", LastValue.<Integer>create("output"));
+        
+        // Create Pregel instance with both nodes
+        Pregel<Integer, Integer> pregel = new Pregel.Builder<Integer, Integer>()
+                .addNode(adder)
+                .addNode(multiplier)
+                .addChannels(channels)
+                .build();
+        
+        // Run with input 5
+        Map<String, Integer> input = Collections.singletonMap("input", 5);
+        Map<String, Integer> result = pregel.invoke(input, null);
+        
+        // Print result: (5 + 1) * 2 = 12
+        System.out.println("Result: " + result.get("output"));
+    }
+}
+```
+
+## Advanced Usage
+
+### Working with String Data
+
+```java
+// Create a node that processes string data
+PregelNode<String, String> processor = new PregelNode.Builder<>("processor", 
+    new PregelExecutable<String, String>() {
+        @Override
+        public Map<String, String> execute(Map<String, String> inputs, Map<String, Object> context) {
+            String input = inputs.getOrDefault("input", "");
+            Map<String, String> output = new HashMap<>();
+            output.put("output", input.toUpperCase());
+            return output;
+        }
+    })
+    .channels("input")
+    .triggerChannels("input")
+    .writers("output")
+    .build();
+
+// Create channels
+Map<String, BaseChannel<?, ?, ?>> channels = new HashMap<>();
+channels.put("input", LastValue.<String>create("input"));
+channels.put("output", LastValue.<String>create("output"));
+
+// Create Pregel instance
+Pregel<String, String> pregel = new Pregel.Builder<String, String>()
+        .addNode(processor)
+        .addChannels(channels)
+        .build();
+```
+
+### Working with JSON-like Data
+
+```java
+// Create a node that processes Map<String, Object> data (JSON-like)
+PregelNode<Map<String, Object>, Map<String, Object>> processor = 
+    new PregelNode.Builder<>("processor", 
+        new PregelExecutable<Map<String, Object>, Map<String, Object>>() {
+            @Override
+            public Map<String, Map<String, Object>> execute(
+                    Map<String, Map<String, Object>> inputs, 
+                    Map<String, Object> context) {
+                
+                Map<String, Object> input = inputs.getOrDefault("input", Collections.emptyMap());
+                
+                // Process input
+                Map<String, Object> result = new HashMap<>(input);
+                result.put("processed", true);
+                
+                Map<String, Map<String, Object>> output = new HashMap<>();
+                output.put("output", result);
+                return output;
+            }
+        })
+        .channels("input")
+        .triggerChannels("input")
+        .writers("output")
+        .build();
+
+// Create channels
+Map<String, BaseChannel<?, ?, ?>> channels = new HashMap<>();
+channels.put("input", LastValue.<Map<String, Object>>create("input"));
+channels.put("output", LastValue.<Map<String, Object>>create("output"));
+
+// Create Pregel instance
+Pregel<Map<String, Object>, Map<String, Object>> pregel = 
+    new Pregel.Builder<Map<String, Object>, Map<String, Object>>()
+        .addNode(processor)
+        .addChannels(channels)
+        .build();
+```
+
+## Channel Types
+
+LangGraph Java provides different channel types for different use cases:
+
+- **LastValue**: Stores the last value written to the channel
+- **TopicChannel**: Collects multiple values into a list
+- **EphemeralValue**: Only available for the current execution step
+
+## Contributing
+
+Contributions are welcome! Please feel free to submit a Pull Request.
+
+## License
+
+This project is licensed under the MIT License - see the LICENSE file for details.

langgraph-java/SUMMARY.md

@@ -0,0 +1,54 @@
+# Type-Safe LangGraph Java Implementation Summary
+
+## Changes Made
+
+1. **PregelExecutable<I, O> Interface**
+   - Added generic type parameters for input and output
+   - Provides strict typing for node actions
+   - Added Legacy adapter for backward compatibility
+
+2. **PregelNode<I, O> Class**
+   - Made generic to enforce type safety
+   - Added input and output type tracking
+   - Enhanced with type validation during execution
+   - Legacy factory methods for compatibility
+
+3. **PregelProtocol<I, O> Interface**
+   - Added type parameters for input and output
+   - Typed API for graph I/O
+   - Legacy subinterface for backward compatibility
+
+4. **Pregel<I, O> Class**
+   - Type-safe implementation
+   - Type validation for channels and nodes
+   - Enhanced builder pattern with types
+   - Legacy factory methods
+
+
+## Type Safety Benefits
+
+1. **Compile-time Type Checking**
+   - Input/output types checked at compile time
+   - Prevents type errors at runtime
+   - Clearer API for developers
+
+2. **Enhanced Runtime Validation**
+   - Validates type compatibility at graph construction
+   - Checks node/channel compatibility
+   - Provides clear error messages for mismatches
+
+3. **Reduced Need for Type Casting**
+   - Explicit type parameters eliminate need for casts
+   - Prevents ClassCastExceptions
+   - Better developer experience
+
+4. **Documentation & API Clarity**
+   - Type parameters document expected types
+   - Self-documenting builder pattern
+   - Clearer type relationships
+
+5. **Backward Compatibility**
+   - Legacy methods for existing code
+   - Gradual migration possible
+   - No breaking changes to existing APIs
+

langgraph-java/build.gradle

@@ -0,0 +1,39 @@
+plugins {
+    id 'java-library'
+}
+
+allprojects {
+    group = 'com.langgraph'
+    version = '0.1.0-SNAPSHOT'
+
+    repositories {
+        mavenCentral()
+    }
+}
+
+subprojects {
+    apply plugin: 'java-library'
+    
+    java {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+    
+    tasks.withType(JavaCompile) {
+        options.encoding = 'UTF-8'
+        options.compilerArgs << '-parameters'
+    }
+    
+    dependencies {
+        // Testing dependencies
+        testImplementation 'org.junit.jupiter:junit-jupiter-api:5.9.2'
+        testImplementation 'org.junit.jupiter:junit-jupiter-params:5.9.2'
+        testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.9.2'
+        testImplementation 'org.mockito:mockito-core:5.2.0'
+        testImplementation 'org.assertj:assertj-core:3.24.2'
+    }
+    
+    test {
+        useJUnitPlatform()
+    }
+}

langgraph-java/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.13-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

langgraph-java/gradlew

@@ -0,0 +1,251 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"

langgraph-java/gradlew.bat

@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega

langgraph-java/langgraph-checkpoint/build.gradle

@@ -0,0 +1,5 @@
+dependencies {
+    // MessagePack for serialization
+    implementation 'org.msgpack:msgpack-core:0.9.3'
+    implementation 'org.msgpack:jackson-dataformat-msgpack:0.9.3'
+}