feat: Customizable Pip Installer (#5098)

Let you set "pip_installer": "pip" (or uv) to handle corner cases in install compatibilities

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -1,6 +1,6 @@
 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 GitHub Discussions.
-labels: ["02 Bug Report"]
+labels: [pending,bug]
 body:
   - type: markdown
     attributes:

.github/ISSUE_TEMPLATE/documentation.yml

@@ -1,7 +1,7 @@
 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]
+labels: [documentation]
 
 body:
 - type: textarea

AGENTS.md

@@ -0,0 +1,55 @@
+# 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:
+
+```
+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 Platform 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.

README.md

@@ -12,7 +12,6 @@
 [![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/)
-[![GitMCP](https://img.shields.io/endpoint?url=https://gitmcp.io/badge/langchain-ai/langgraph)](https://gitmcp.io/langchain-ai/langgraph)
 
 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.
 

docs/docs/cloud/deployment/self_hosted_control_plane.md

@@ -30,18 +30,16 @@ Before deploying, review the [conceptual guide for the Self-Hosted Control Plane
     1. `LangGraphPlatform CRD`: A CRD for LangGraph Platform deployments. This contains the spec for managing an instance of a LangGraph platform deployment.
     1. `operator`: This operator handles changes to your LangGraph Platform CRDs.
     1. `host-backend`: This is the [control plane](../../concepts/langgraph_control_plane.md).
-1. Two additional images will be used by the chart.
+1. Two additional images will be used by the chart. Use the images that are specified in the latest release.
 
         hostBackendImage:
           repository: "docker.io/langchain/hosted-langserve-backend"
           pullPolicy: IfNotPresent
-          tag: "0.9.80"
         operatorImage:
           repository: "docker.io/langchain/langgraph-operator"
           pullPolicy: IfNotPresent
-          tag: "aa9dff4"
 
-1. In your `langsmith_config.yaml` file, enable the `langgraphPlatform` option. Note that you must also have a valid ingress setup:
+1. In your config file for langsmith (usually `langsmith_config.yaml`, enable the `langgraphPlatform` option. Note that you must also have a valid ingress setup:
 
         config:
           langgraphPlatform:

docs/docs/cloud/reference/api/openapi.json

@@ -3818,6 +3818,14 @@
             "title": "Filter",
             "description": "Optional dictionary of key-value pairs to filter results."
           },
+          "query": {
+            "type": [
+              "string",
+              "null"
+            ],
+            "title": "Query",
+            "description": "Query string for semantic/vector search."
+          },
           "limit": {
             "type": "integer",
             "default": 10,

docs/docs/cloud/reference/env_var.md

@@ -123,3 +123,12 @@ Defaults to `''`.
 Set `REDIS_CLUSTER` to `True` to enable Redis Cluster mode. When enabled, the system will connect to Redis using cluster mode. This is useful when connecting to a Redis Cluster deployment.
 
 Defaults to `False`.
+
+## `MOUNT_PREFIX`
+
+!!! info "Only Allowed in Self-Hosted Deployments"
+    The `MOUNT_PREFIX` environment variable is only allowed in Self-Hosted Deployment models, LangGraph Platform SaaS will not allow this environment variable.
+
+Set `MOUNT_PREFIX` to serve the LangGraph Server under a specific path prefix. This is useful for deployments where the server is behind a reverse proxy or load balancer that requires a specific path prefix.
+
+For example, if the server is to be served under `https://example.com/langgraph`, set `MOUNT_PREFIX` to `/langgraph`.

docs/docs/concepts/persistence.md

@@ -470,9 +470,51 @@ If the checkpointer is used with asynchronous graph execution (i.e. executing th
 
 ### Serializer
 
-When checkpointers save the graph state, they need to serialize the channel values in the state. This is done using serializer objects. 
+When checkpointers save the graph state, they need to serialize the channel values in the state. This is done using serializer objects.
 `langgraph_checkpoint` defines [protocol][langgraph.checkpoint.serde.base.SerializerProtocol] for implementing serializers provides a default implementation ([JsonPlusSerializer][langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer]) that handles a wide variety of types, including LangChain and LangGraph primitives, datetimes, enums and more.
 
+#### Serialization with `pickle`
+
+The default serializer, [`JsonPlusSerializer`][langgraph.checkpoint.serde.jsonplus.JsonPlusSerializer], uses ormsgpack and JSON under the hood, which is not suitable for all types of objects.
+
+If you want to fallback to pickle for objects not currently supported by our msgpack encoder (such as Pandas dataframes),
+you can use the `pickle_fallback` argument of the `JsonPlusSerializer`:
+
+```python
+from langgraph.checkpoint.memory import MemorySaver
+from langgraph.checkpoint.serde.jsonplus import JsonPlusSerializer
+
+# ... Define the graph ...
+graph.compile(
+    checkpointer=MemorySaver(serde=JsonPlusSerializer(pickle_fallback=True))
+)
+```
+
+#### Encryption
+
+Checkpointers can optionally encrypt all persisted state. To enable this, pass an instance of [`EncryptedSerializer`][langgraph.checkpoint.serde.encrypted.EncryptedSerializer] to the `serde` argument of any `BaseCheckpointSaver` implementation. The easiest way to create an encrypted serializer is via [`from_pycryptodome_aes`][langgraph.checkpoint.serde.encrypted.EncryptedSerializer.from_pycryptodome_aes], which reads the AES key from the `LANGGRAPH_AES_KEY` environment variable (or accepts a `key` argument):
+
+```python
+import sqlite3
+
+from langgraph.checkpoint.serde.encrypted import EncryptedSerializer
+from langgraph.checkpoint.sqlite import SqliteSaver
+
+serde = EncryptedSerializer.from_pycryptodome_aes()  # reads LANGGRAPH_AES_KEY
+checkpointer = SqliteSaver(sqlite3.connect("checkpoint.db"), serde=serde)
+```
+
+```python
+from langgraph.checkpoint.serde.encrypted import EncryptedSerializer
+from langgraph.checkpoint.postgres import PostgresSaver
+
+serde = EncryptedSerializer.from_pycryptodome_aes()
+checkpointer = PostgresSaver.from_conn_string("postgresql://...", serde=serde)
+checkpointer.setup()
+```
+
+When running on LangGraph Platform, encryption is automatically enabled whenever `LANGGRAPH_AES_KEY` is present, so you only need to provide the environment variable. Other encryption schemes can be used by implementing [`CipherProtocol`][langgraph.checkpoint.serde.base.CipherProtocol] and supplying it to `EncryptedSerializer`.
+
 ## Capabilities
 
 ### Human-in-the-loop

docs/docs/concepts/subgraphs.md

@@ -59,8 +59,9 @@ The main question when adding subgraphs is how the parent graph and subgraph com
         response = model.invoke(state["subgraph_messages"])
         return {"subgraph_messages": response}
 
-    subgraph_builder = StateGraph(State)
-    subgraph_builder.add_node(call_model)
+    subgraph_builder = StateGraph(SubgraphMessagesState)
+    subgraph_builder.add_node("call_model_from_subgraph", call_model)
+    subgraph_builder.add_edge(START, "call_model_from_subgraph")
     ...
     # highlight-next-line
     subgraph = subgraph_builder.compile()

docs/docs/how-tos/persistence.ipynb

@@ -1107,10 +1107,10 @@
    "source": [
     "### Use in production\n",
     "\n",
-    "In production, you would want to use a checkpointer backed by a database:\n",
+    "In production, you would want to use a store backed by a database:\n",
     "\n",
     "```python\n",
-    "from langgraph.checkpoint.postgres import PostgresSaver\n",
+    "from langgraph.store.postgres import PostgresStore\n",
     "\n",
     "DB_URI = \"postgresql://postgres:postgres@localhost:5442/postgres?sslmode=disable\"\n",
     "# highlight-next-line\n",

docs/docs/reference/checkpoints.md

@@ -12,12 +12,18 @@
     options:
       members:
         - SerializerProtocol
+        - CipherProtocol
 
 ::: langgraph.checkpoint.serde.jsonplus
     options:
       members:
         - JsonPlusSerializer
 
+::: langgraph.checkpoint.serde.encrypted
+    options:
+      members:
+        - EncryptedSerializer
+
 ::: langgraph.checkpoint.memory
 
 ::: langgraph.checkpoint.sqlite
@@ -32,4 +38,4 @@
 ::: langgraph.checkpoint.postgres.aio
     options:
       members:
-        - AsyncPostgresSaver
+        - AsyncPostgresSaver

docs/docs/tutorials/chatbot-simulation-evaluation/langsmith-agent-simulation-evaluation.ipynb

@@ -580,9 +580,7 @@
     "    ]\n",
     ")\n",
     "\n",
-    "evaluator = prompt | ChatOpenAI(model=\"gpt-4-turbo-preview\").with_structured_output(\n",
-    "    RedTeamingResult, method=\"function_calling\"\n",
-    ")\n",
+    "evaluator = prompt | ChatOpenAI(model=\"gpt-4o\").with_structured_output(RedTeamingResult)\n",
     "\n",
     "\n",
     "def did_resist(run, example):\n",

docs/docs/tutorials/llm-compiler/LLMCompiler.ipynb

@@ -471,7 +471,7 @@
     "\n",
     "_get_pass(\"TAVILY_API_KEY\")\n",
     "\n",
-    "calculate = get_math_tool(ChatOpenAI(model=\"gpt-4-turbo-preview\"))\n",
+    "calculate = get_math_tool(ChatOpenAI(model=\"gpt-4o\"))\n",
     "search = TavilySearchResults(\n",
     "    max_results=1,\n",
     "    description='tavily_search_results_json(query=\"the search query\") - a search engine.',\n",
@@ -540,11 +540,11 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "================================\u001b[1m System Message \u001b[0m================================\n",
+      "================================\u001B[1m System Message \u001B[0m================================\n",
       "\n",
-      "Given a user query, create a plan to solve it with the utmost parallelizability. Each plan should comprise an action from the following \u001b[33;1m\u001b[1;3m{num_tools}\u001b[0m types:\n",
-      "\u001b[33;1m\u001b[1;3m{tool_descriptions}\u001b[0m\n",
-      "\u001b[33;1m\u001b[1;3m{num_tools}\u001b[0m. join(): Collects and combines results from prior actions.\n",
+      "Given a user query, create a plan to solve it with the utmost parallelizability. Each plan should comprise an action from the following \u001B[33;1m\u001B[1;3m{num_tools}\u001B[0m types:\n",
+      "\u001B[33;1m\u001B[1;3m{tool_descriptions}\u001B[0m\n",
+      "\u001B[33;1m\u001B[1;3m{num_tools}\u001B[0m. join(): Collects and combines results from prior actions.\n",
       "\n",
       " - An LLM agent is called upon invoking join() to either finalize the user query or wait until the plans are executed.\n",
       " - join should always be the last action in the plan, and will be called in two scenarios:\n",
@@ -561,11 +561,11 @@
       " - Only use the provided action types. If a query cannot be addressed using these, invoke the join action for the next steps.\n",
       " - Never introduce new actions other than the ones provided.\n",
       "\n",
-      "=============================\u001b[1m Messages Placeholder \u001b[0m=============================\n",
+      "=============================\u001B[1m Messages Placeholder \u001B[0m=============================\n",
       "\n",
-      "\u001b[33;1m\u001b[1;3m{messages}\u001b[0m\n",
+      "\u001B[33;1m\u001B[1;3m{messages}\u001B[0m\n",
       "\n",
-      "================================\u001b[1m System Message \u001b[0m================================\n",
+      "================================\u001B[1m System Message \u001B[0m================================\n",
       "\n",
       "Remember, ONLY respond with the task list in the correct format! E.g.:\n",
       "idx. tool(arg_name=args)\n",
@@ -1030,7 +1030,7 @@
     "joiner_prompt = hub.pull(\"wfh/llm-compiler-joiner\").partial(\n",
     "    examples=\"\"\n",
     ")  # You can optionally add examples\n",
-    "llm = ChatOpenAI(model=\"gpt-4-turbo-preview\")\n",
+    "llm = ChatOpenAI(model=\"gpt-4o\")\n",
     "\n",
     "runnable = joiner_prompt | llm.with_structured_output(\n",
     "    JoinOutputs, method=\"function_calling\"\n",

docs/docs/tutorials/multi_agent/agent_supervisor.ipynb

@@ -54,6 +54,7 @@
     "    if not os.environ.get(var):\n",
     "        os.environ[var] = getpass.getpass(f\"Please provide your {var}\")\n",
     "\n",
+    "\n",
     "_set_if_undefined(\"OPENAI_API_KEY\")\n",
     "_set_if_undefined(\"TAVILY_API_KEY\")"
    ]

docs/docs/tutorials/plan-and-execute/plan-and-execute.ipynb

@@ -135,7 +135,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from langchain import hub\n",
     "from langchain_openai import ChatOpenAI\n",
     "\n",
     "from langgraph.prebuilt import create_react_agent\n",

docs/docs/tutorials/rag/langgraph_adaptive_rag.ipynb

@@ -90,7 +90,11 @@
    "id": "9ac1c2cd-81fb-40eb-8ba1-e9197800cba6",
    "metadata": {},
    "source": [
-    "## Create Index"
+    "## Create Index\n",
+    "\n",
+    "Set up a vector database using OpenAI Embeddings and the Chroma vector database.  \n",
+    "Input URLs of blog posts related to agents, prompt engineering, and large language models (LLMs).  \n",
+    "Generate vector indices for use in Retrieval-Augmented Generation (RAG)."
    ]
   },
   {
@@ -159,6 +163,21 @@
     "</div>"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "6cdd5ac0-fa18-4ee9-8051-062a0c56268f",
+   "metadata": {},
+   "source": [
+    "### Router for Query Analysis\n",
+    "\n",
+    "Let’s start with Routing. First, assign the query analysis to the LLM.\n",
+    "\n",
+    "Create a RouteQuery data model and specify it in a structured format for the LLM. The decision for routing should be embedded in the prompt. You need to clearly define which parts of the document should be directed to RAG based on the topic.\n",
+    "\n",
+    "While you could automate this process by having the LLM summarize the RAG documents again, it’s more cost-effective to manually manage this when dealing with large documents, as automation could become expensive.\n",
+    "\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 4,
@@ -219,6 +238,18 @@
     "print(question_router.invoke({\"question\": \"What are the types of agent memory?\"}))"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "cb248c94-0b0c-4d86-8565-32aa8d7424e4",
+   "metadata": {},
+   "source": [
+    "### Retrieval Grader\n",
+    "\n",
+    "After performing retrieval, evaluate the results. Although you initially decided to use RAG based on the query, the retrieved documents might not be satisfactory. Assess whether the retrieved documents are sufficiently relevant to the query.\n",
+    "\n",
+    "For this, rely on the LLM to evaluate the relevance, providing a binary ‘yes’ or ‘no’ decision."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 5,
@@ -309,6 +340,17 @@
     "print(generation)"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "cb0ab54a-4a4f-45fa-b1c5-cea1bf4c59d5",
+   "metadata": {},
+   "source": [
+    "### Hallucination Grader\n",
+    "\n",
+    "Verify if the LLM produced any hallucinations by comparing its output to the retrieved facts.  \n",
+    "Provide the LLM’s evaluation in a binary ‘yes’ or ‘no’ format.\n"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 7,
@@ -357,6 +399,16 @@
     "hallucination_grader.invoke({\"documents\": docs, \"generation\": generation})"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "4f58502a-c25f-4d80-a402-5583b0cd3e41",
+   "metadata": {},
+   "source": [
+    "### Answer Grader\n",
+    "\n",
+    "Evaluate the answer finally."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 8,
@@ -405,6 +457,18 @@
     "answer_grader.invoke({\"question\": question, \"generation\": generation})"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "af77946c-2646-4039-86b0-e2fde1ab7459",
+   "metadata": {},
+   "source": [
+    "### Question Rewriting\n",
+    "\n",
+    "The original question from user was directly used in RAG.  \n",
+    "However, the user’s question might not be in a form suitable for RAG.  \n",
+    "To improve retrieval, rephrase the question to ensure it aligns better with vector similarity search."
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 9,
@@ -450,7 +514,9 @@
    "id": "d07c0b31-b919-4498-869f-9673125c2473",
    "metadata": {},
    "source": [
-    "## Web Search Tool"
+    "## Web Search Tool\n",
+    "\n",
+    "Use Tavily Search tool to get information from the web."
    ]
   },
   {

docs/docs/tutorials/rag/langgraph_crag.ipynb

@@ -185,7 +185,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeDocuments)\n",
     "\n",
     "# Prompt\n",

docs/mkdocs.yml

@@ -381,25 +381,6 @@ extra:
       link: https://github.com/langchain-ai/langgraph
     - icon: fontawesome/brands/twitter
       link: https://twitter.com/LangChainAI
-  analytics:
-    provider: google
-    property: G-G8X6ELZYE0
-    feedback:
-      title: Was this page helpful?
-      ratings:
-        - icon: material/emoticon-happy-outline
-          name: This page was helpful
-          data: 1
-          note: >-
-            Thanks for your feedback!
-        - icon: material/emoticon-sad-outline
-          name: This page could be improved
-          data: 0
-          note: >-
-            Thanks for your feedback! Please help us improve this page by adding to the discussion below.
-  shared_analytics:
-    provider: google
-    property: G-47WX3HKKY2
 validation:
   # https://www.mkdocs.org/user-guide/configuration/
   # We are still raising for omitted files because they determine the breadcrumbs for pages.

examples/rag/langgraph_adaptive_rag.ipynb

@@ -184,7 +184,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_router = llm.with_structured_output(RouteQuery)\n",
     "\n",
     "# Prompt\n",
@@ -235,7 +235,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeDocuments)\n",
     "\n",
     "# Prompt\n",
@@ -328,7 +328,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeHallucinations)\n",
     "\n",
     "# Prompt\n",
@@ -376,7 +376,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeAnswer)\n",
     "\n",
     "# Prompt\n",

examples/rag/langgraph_agentic_rag.ipynb

@@ -200,11 +200,11 @@
      "output_type": "stream",
      "text": [
       "********************Prompt[rlm/rag-prompt]********************\n",
-      "================================\u001b[1m Human Message \u001b[0m=================================\n",
+      "================================\u001B[1m Human Message \u001B[0m=================================\n",
       "\n",
       "You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise.\n",
-      "Question: \u001b[33;1m\u001b[1;3m{question}\u001b[0m \n",
-      "Context: \u001b[33;1m\u001b[1;3m{context}\u001b[0m \n",
+      "Question: \u001B[33;1m\u001B[1;3m{question}\u001B[0m \n",
+      "Context: \u001B[33;1m\u001B[1;3m{context}\u001B[0m \n",
       "Answer:\n"
      ]
     }
@@ -244,7 +244,7 @@
     "        binary_score: str = Field(description=\"Relevance score 'yes' or 'no'\")\n",
     "\n",
     "    # LLM\n",
-    "    model = ChatOpenAI(temperature=0, model=\"gpt-4-0125-preview\", streaming=True)\n",
+    "    model = ChatOpenAI(temperature=0, model=\"gpt-4o\", streaming=True)\n",
     "\n",
     "    # LLM with tool and validation\n",
     "    llm_with_tool = model.with_structured_output(grade)\n",

examples/rag/langgraph_crag.ipynb

@@ -171,7 +171,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeDocuments)\n",
     "\n",
     "# Prompt\n",

examples/rag/langgraph_self_rag.ipynb

@@ -191,7 +191,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeDocuments)\n",
     "\n",
     "# Prompt\n",
@@ -284,7 +284,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeHallucinations)\n",
     "\n",
     "# Prompt\n",
@@ -332,7 +332,7 @@
     "\n",
     "\n",
     "# LLM with function call\n",
-    "llm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
     "structured_llm_grader = llm.with_structured_output(GradeAnswer)\n",
     "\n",
     "# Prompt\n",

examples/rag/langgraph_self_rag_pinecone_movies.ipynb

@@ -33,7 +33,9 @@
    "id": "a384cc48-0425-4e8f-aafc-cfb8e56025c9",
    "metadata": {},
    "outputs": [],
-   "source": ["%pip install -qU langchain-pinecone langchain-openai langchainhub langgraph"]
+   "source": [
+    "%pip install -qU langchain-pinecone langchain-openai langchainhub langgraph"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -51,7 +53,9 @@
    "id": "ccc3dae5-1df6-48ca-af8a-50f0e6128876",
    "metadata": {},
    "outputs": [],
-   "source": ["import os\n\nos.environ[\"LANGCHAIN_TRACING_V2\"] = \"true\"\nos.environ[\"LANGCHAIN_ENDPOINT\"] = \"https://api.smith.langchain.com\"\nos.environ[\"LANGCHAIN_API_KEY\"] = \"<your-api-key>\""]
+   "source": [
+    "import os\n\nos.environ[\"LANGCHAIN_TRACING_V2\"] = \"true\"\nos.environ[\"LANGCHAIN_ENDPOINT\"] = \"https://api.smith.langchain.com\"\nos.environ[\"LANGCHAIN_API_KEY\"] = \"<your-api-key>\""
+   ]
   },
   {
    "cell_type": "code",
@@ -59,7 +63,9 @@
    "id": "88637820",
    "metadata": {},
    "outputs": [],
-   "source": ["import os\n\nos.environ[\"LANGCHAIN_PROJECT\"] = \"pinecone-devconnect\""]
+   "source": [
+    "import os\n\nos.environ[\"LANGCHAIN_PROJECT\"] = \"pinecone-devconnect\""
+   ]
   },
   {
    "cell_type": "markdown",
@@ -77,7 +83,9 @@
    "id": "565a6d44-2c9f-4fff-b1ec-eea05df9350d",
    "metadata": {},
    "outputs": [],
-   "source": ["from langchain_openai import OpenAIEmbeddings\nfrom langchain_pinecone import PineconeVectorStore\n\n# use pinecone movies database\n\n# Add to vectorDB\nvectorstore = PineconeVectorStore(\n    embedding=OpenAIEmbeddings(),\n    index_name=\"sample-movies\",\n    text_key=\"summary\",\n)\nretriever = vectorstore.as_retriever()"]
+   "source": [
+    "from langchain_openai import OpenAIEmbeddings\nfrom langchain_pinecone import PineconeVectorStore\n\n# use pinecone movies database\n\n# Add to vectorDB\nvectorstore = PineconeVectorStore(\n    embedding=OpenAIEmbeddings(),\n    index_name=\"sample-movies\",\n    text_key=\"summary\",\n)\nretriever = vectorstore.as_retriever()"
+   ]
   },
   {
    "cell_type": "code",
@@ -104,7 +112,9 @@
      ]
     }
    ],
-   "source": ["docs = retriever.invoke(\"James Cameron\")\nfor doc in docs:\n    print(\"# \" + doc.metadata[\"title\"])\n    print(doc.page_content)\n    print()"]
+   "source": [
+    "docs = retriever.invoke(\"James Cameron\")\nfor doc in docs:\n    print(\"# \" + doc.metadata[\"title\"])\n    print(doc.page_content)\n    print()"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -120,7 +130,32 @@
    "id": "1fafad21-60cc-483e-92a3-6a7edb1838e3",
    "metadata": {},
    "outputs": [],
-   "source": ["### Retrieval Grader\n\nfrom langchain import hub\nfrom langchain_core.pydantic_v1 import BaseModel, Field\nfrom langchain_openai import ChatOpenAI\n\n\n# Data model\nclass GradeDocuments(BaseModel):\n    \"\"\"Binary score for relevance check on retrieved documents.\"\"\"\n\n    binary_score: str = Field(\n        description=\"Documents are relevant to the question, 'yes' or 'no'\"\n    )\n\n\n# https://smith.langchain.com/hub/efriis/self-rag-retrieval-grader\ngrade_prompt = hub.pull(\"efriis/self-rag-retrieval-grader\")\n\n# LLM with function call\nllm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\nstructured_llm_grader = llm.with_structured_output(GradeDocuments)\n\nretrieval_grader = grade_prompt | structured_llm_grader"]
+   "source": [
+    "### Retrieval Grader\n",
+    "\n",
+    "from langchain import hub\n",
+    "from langchain_core.pydantic_v1 import BaseModel, Field\n",
+    "from langchain_openai import ChatOpenAI\n",
+    "\n",
+    "\n",
+    "# Data model\n",
+    "class GradeDocuments(BaseModel):\n",
+    "    \"\"\"Binary score for relevance check on retrieved documents.\"\"\"\n",
+    "\n",
+    "    binary_score: str = Field(\n",
+    "        description=\"Documents are relevant to the question, 'yes' or 'no'\"\n",
+    "    )\n",
+    "\n",
+    "\n",
+    "# https://smith.langchain.com/hub/efriis/self-rag-retrieval-grader\n",
+    "grade_prompt = hub.pull(\"efriis/self-rag-retrieval-grader\")\n",
+    "\n",
+    "# LLM with function call\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
+    "structured_llm_grader = llm.with_structured_output(GradeDocuments)\n",
+    "\n",
+    "retrieval_grader = grade_prompt | structured_llm_grader"
+   ]
   },
   {
    "cell_type": "code",
@@ -137,7 +172,9 @@
      ]
     }
    ],
-   "source": ["# Test the retrieval grader\nquestion = \"movies starring jason momoa\"\ndocs = retriever.invoke(question)\ndoc_txt = docs[0].page_content\nprint(doc_txt)\nprint(retrieval_grader.invoke({\"question\": question, \"document\": doc_txt}))"]
+   "source": [
+    "# Test the retrieval grader\nquestion = \"movies starring jason momoa\"\ndocs = retriever.invoke(question)\ndoc_txt = docs[0].page_content\nprint(doc_txt)\nprint(retrieval_grader.invoke({\"question\": question, \"document\": doc_txt}))"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -163,7 +200,9 @@
      ]
     }
    ],
-   "source": ["### Generate\n\nfrom langchain import hub\nfrom langchain_core.output_parsers import StrOutputParser\n\n# Prompt\nprompt = hub.pull(\"rlm/rag-prompt\")\n\n# LLM\nllm = ChatOpenAI(model_name=\"gpt-3.5-turbo\", temperature=0)\n\n# Chain\nrag_chain = prompt | llm | StrOutputParser()\n\n# Run\ngeneration = rag_chain.invoke({\"context\": docs, \"question\": question})\nprint(generation)"]
+   "source": [
+    "### Generate\n\nfrom langchain import hub\nfrom langchain_core.output_parsers import StrOutputParser\n\n# Prompt\nprompt = hub.pull(\"rlm/rag-prompt\")\n\n# LLM\nllm = ChatOpenAI(model_name=\"gpt-3.5-turbo\", temperature=0)\n\n# Chain\nrag_chain = prompt | llm | StrOutputParser()\n\n# Run\ngeneration = rag_chain.invoke({\"context\": docs, \"question\": question})\nprint(generation)"
+   ]
   },
   {
    "cell_type": "code",
@@ -189,7 +228,30 @@
      "output_type": "execute_result"
     }
    ],
-   "source": ["### Hallucination Grader\n\n\n# Data model\nclass GradeHallucinations(BaseModel):\n    \"\"\"Binary score for hallucination present in generation answer.\"\"\"\n\n    binary_score: str = Field(\n        description=\"Answer is grounded in the facts, 'yes' or 'no'\"\n    )\n\n\n# LLM with function call\nllm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\nstructured_llm_grader = llm.with_structured_output(GradeHallucinations)\n\n# https://smith.langchain.com/hub/efriis/self-rag-hallucination-grader\nhallucination_prompt = hub.pull(\"efriis/self-rag-hallucination-grader\")\n\nhallucination_grader = hallucination_prompt | structured_llm_grader\nprint(generation)\nhallucination_grader.invoke({\"documents\": docs, \"generation\": generation})"]
+   "source": [
+    "### Hallucination Grader\n",
+    "\n",
+    "\n",
+    "# Data model\n",
+    "class GradeHallucinations(BaseModel):\n",
+    "    \"\"\"Binary score for hallucination present in generation answer.\"\"\"\n",
+    "\n",
+    "    binary_score: str = Field(\n",
+    "        description=\"Answer is grounded in the facts, 'yes' or 'no'\"\n",
+    "    )\n",
+    "\n",
+    "\n",
+    "# LLM with function call\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
+    "structured_llm_grader = llm.with_structured_output(GradeHallucinations)\n",
+    "\n",
+    "# https://smith.langchain.com/hub/efriis/self-rag-hallucination-grader\n",
+    "hallucination_prompt = hub.pull(\"efriis/self-rag-hallucination-grader\")\n",
+    "\n",
+    "hallucination_grader = hallucination_prompt | structured_llm_grader\n",
+    "print(generation)\n",
+    "hallucination_grader.invoke({\"documents\": docs, \"generation\": generation})"
+   ]
   },
   {
    "cell_type": "code",
@@ -216,7 +278,31 @@
      "output_type": "execute_result"
     }
    ],
-   "source": ["### Answer Grader\n\n\n# Data model\nclass GradeAnswer(BaseModel):\n    \"\"\"Binary score to assess answer addresses question.\"\"\"\n\n    binary_score: str = Field(\n        description=\"Answer addresses the question, 'yes' or 'no'\"\n    )\n\n\n# LLM with function call\nllm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\nstructured_llm_grader = llm.with_structured_output(GradeAnswer)\n\n# Prompt\nanswer_prompt = hub.pull(\"efriis/self-rag-answer-grader\")\n\nanswer_grader = answer_prompt | structured_llm_grader\nprint(question)\nprint(generation)\nanswer_grader.invoke({\"question\": question, \"generation\": generation})"]
+   "source": [
+    "### Answer Grader\n",
+    "\n",
+    "\n",
+    "# Data model\n",
+    "class GradeAnswer(BaseModel):\n",
+    "    \"\"\"Binary score to assess answer addresses question.\"\"\"\n",
+    "\n",
+    "    binary_score: str = Field(\n",
+    "        description=\"Answer addresses the question, 'yes' or 'no'\"\n",
+    "    )\n",
+    "\n",
+    "\n",
+    "# LLM with function call\n",
+    "llm = ChatOpenAI(model=\"gpt-4o-mini\", temperature=0)\n",
+    "structured_llm_grader = llm.with_structured_output(GradeAnswer)\n",
+    "\n",
+    "# Prompt\n",
+    "answer_prompt = hub.pull(\"efriis/self-rag-answer-grader\")\n",
+    "\n",
+    "answer_grader = answer_prompt | structured_llm_grader\n",
+    "print(question)\n",
+    "print(generation)\n",
+    "answer_grader.invoke({\"question\": question, \"generation\": generation})"
+   ]
   },
   {
    "cell_type": "code",
@@ -242,7 +328,9 @@
      "output_type": "execute_result"
     }
    ],
-   "source": ["### Question Re-writer\n\n# LLM\nllm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n\n# Prompt\nre_write_prompt = hub.pull(\"efriis/self-rag-question-rewriter\")\n\nquestion_rewriter = re_write_prompt | llm | StrOutputParser()\nprint(question)\nquestion_rewriter.invoke({\"question\": question})"]
+   "source": [
+    "### Question Re-writer\n\n# LLM\nllm = ChatOpenAI(model=\"gpt-3.5-turbo-0125\", temperature=0)\n\n# Prompt\nre_write_prompt = hub.pull(\"efriis/self-rag-question-rewriter\")\n\nquestion_rewriter = re_write_prompt | llm | StrOutputParser()\nprint(question)\nquestion_rewriter.invoke({\"question\": question})"
+   ]
   },
   {
    "cell_type": "markdown",
@@ -262,7 +350,9 @@
    "id": "f1617e9e-66a8-4c1a-a1fe-cc936284c085",
    "metadata": {},
    "outputs": [],
-   "source": ["from typing import List\n\nfrom typing_extensions import TypedDict\n\n\nclass GraphState(TypedDict):\n    \"\"\"\n    Represents the state of our graph.\n\n    Attributes:\n        question: question\n        generation: LLM generation\n        documents: list of documents\n    \"\"\"\n\n    question: str\n    generation: str\n    documents: List[str]"]
+   "source": [
+    "from typing import List\n\nfrom typing_extensions import TypedDict\n\n\nclass GraphState(TypedDict):\n    \"\"\"\n    Represents the state of our graph.\n\n    Attributes:\n        question: question\n        generation: LLM generation\n        documents: list of documents\n    \"\"\"\n\n    question: str\n    generation: str\n    documents: List[str]"
+   ]
   },
   {
    "cell_type": "code",
@@ -270,7 +360,9 @@
    "id": "add509d8-6682-4127-8d95-13dd37d79702",
    "metadata": {},
    "outputs": [],
-   "source": ["### Nodes\n\n\ndef retrieve(state):\n    \"\"\"\n    Retrieve documents\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): New key added to state, documents, that contains retrieved documents\n    \"\"\"\n    print(\"---RETRIEVE---\")\n    question = state[\"question\"]\n\n    # Retrieval\n    documents = retriever.invoke(question)\n    return {\"documents\": documents, \"question\": question}\n\n\ndef generate(state):\n    \"\"\"\n    Generate answer\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): New key added to state, generation, that contains LLM generation\n    \"\"\"\n    print(\"---GENERATE---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n\n    # RAG generation\n    generation = rag_chain.invoke({\"context\": documents, \"question\": question})\n    return {\"documents\": documents, \"question\": question, \"generation\": generation}\n\n\ndef grade_documents(state):\n    \"\"\"\n    Determines whether the retrieved documents are relevant to the question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): Updates documents key with only filtered relevant documents\n    \"\"\"\n\n    print(\"---CHECK DOCUMENT RELEVANCE TO QUESTION---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n\n    # Score each doc\n    filtered_docs = []\n    for d in documents:\n        score = retrieval_grader.invoke(\n            {\"question\": question, \"document\": d.page_content}\n        )\n        grade = score.binary_score\n        if grade == \"yes\":\n            print(\"---GRADE: DOCUMENT RELEVANT---\")\n            filtered_docs.append(d)\n        else:\n            print(\"---GRADE: DOCUMENT NOT RELEVANT---\")\n            continue\n    return {\"documents\": filtered_docs, \"question\": question}\n\n\ndef transform_query(state):\n    \"\"\"\n    Transform the query to produce a better question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): Updates question key with a re-phrased question\n    \"\"\"\n\n    print(\"---TRANSFORM QUERY---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n\n    # Re-write question\n    better_question = question_rewriter.invoke({\"question\": question})\n    return {\"documents\": documents, \"question\": better_question}"]
+   "source": [
+    "### Nodes\n\n\ndef retrieve(state):\n    \"\"\"\n    Retrieve documents\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): New key added to state, documents, that contains retrieved documents\n    \"\"\"\n    print(\"---RETRIEVE---\")\n    question = state[\"question\"]\n\n    # Retrieval\n    documents = retriever.invoke(question)\n    return {\"documents\": documents, \"question\": question}\n\n\ndef generate(state):\n    \"\"\"\n    Generate answer\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): New key added to state, generation, that contains LLM generation\n    \"\"\"\n    print(\"---GENERATE---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n\n    # RAG generation\n    generation = rag_chain.invoke({\"context\": documents, \"question\": question})\n    return {\"documents\": documents, \"question\": question, \"generation\": generation}\n\n\ndef grade_documents(state):\n    \"\"\"\n    Determines whether the retrieved documents are relevant to the question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): Updates documents key with only filtered relevant documents\n    \"\"\"\n\n    print(\"---CHECK DOCUMENT RELEVANCE TO QUESTION---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n\n    # Score each doc\n    filtered_docs = []\n    for d in documents:\n        score = retrieval_grader.invoke(\n            {\"question\": question, \"document\": d.page_content}\n        )\n        grade = score.binary_score\n        if grade == \"yes\":\n            print(\"---GRADE: DOCUMENT RELEVANT---\")\n            filtered_docs.append(d)\n        else:\n            print(\"---GRADE: DOCUMENT NOT RELEVANT---\")\n            continue\n    return {\"documents\": filtered_docs, \"question\": question}\n\n\ndef transform_query(state):\n    \"\"\"\n    Transform the query to produce a better question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        state (dict): Updates question key with a re-phrased question\n    \"\"\"\n\n    print(\"---TRANSFORM QUERY---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n\n    # Re-write question\n    better_question = question_rewriter.invoke({\"question\": question})\n    return {\"documents\": documents, \"question\": better_question}"
+   ]
   },
   {
    "cell_type": "code",
@@ -278,7 +370,9 @@
    "id": "09fc91b4",
    "metadata": {},
    "outputs": [],
-   "source": ["### Edges\n\n\ndef decide_to_generate(state):\n    \"\"\"\n    Determines whether to generate an answer, or re-generate a question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        str: Binary decision for next node to call\n    \"\"\"\n\n    print(\"---ASSESS GRADED DOCUMENTS---\")\n    state[\"question\"]\n    filtered_documents = state[\"documents\"]\n\n    if not filtered_documents:\n        # All documents have been filtered check_relevance\n        # We will re-generate a new query\n        print(\n            \"---DECISION: ALL DOCUMENTS ARE NOT RELEVANT TO QUESTION, TRANSFORM QUERY---\"\n        )\n        return \"transform_query\"\n    else:\n        # We have relevant documents, so generate answer\n        print(\"---DECISION: GENERATE---\")\n        return \"generate\"\n\n\ndef grade_generation_v_documents_and_question(state):\n    \"\"\"\n    Determines whether the generation is grounded in the document and answers question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        str: Decision for next node to call\n    \"\"\"\n\n    print(\"---CHECK HALLUCINATIONS---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n    generation = state[\"generation\"]\n\n    score = hallucination_grader.invoke(\n        {\"documents\": documents, \"generation\": generation}\n    )\n    grade = score.binary_score\n\n    # Check hallucination\n    if grade == \"yes\":\n        print(\"---DECISION: GENERATION IS GROUNDED IN DOCUMENTS---\")\n        # Check question-answering\n        print(\"---GRADE GENERATION vs QUESTION---\")\n        score = answer_grader.invoke({\"question\": question, \"generation\": generation})\n        grade = score.binary_score\n        if grade == \"yes\":\n            print(\"---DECISION: GENERATION ADDRESSES QUESTION---\")\n            return \"useful\"\n        else:\n            print(\"---DECISION: GENERATION DOES NOT ADDRESS QUESTION---\")\n            return \"not useful\"\n    else:\n        pprint(\"---DECISION: GENERATION IS NOT GROUNDED IN DOCUMENTS, RE-TRY---\")\n        return \"not supported\""]
+   "source": [
+    "### Edges\n\n\ndef decide_to_generate(state):\n    \"\"\"\n    Determines whether to generate an answer, or re-generate a question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        str: Binary decision for next node to call\n    \"\"\"\n\n    print(\"---ASSESS GRADED DOCUMENTS---\")\n    state[\"question\"]\n    filtered_documents = state[\"documents\"]\n\n    if not filtered_documents:\n        # All documents have been filtered check_relevance\n        # We will re-generate a new query\n        print(\n            \"---DECISION: ALL DOCUMENTS ARE NOT RELEVANT TO QUESTION, TRANSFORM QUERY---\"\n        )\n        return \"transform_query\"\n    else:\n        # We have relevant documents, so generate answer\n        print(\"---DECISION: GENERATE---\")\n        return \"generate\"\n\n\ndef grade_generation_v_documents_and_question(state):\n    \"\"\"\n    Determines whether the generation is grounded in the document and answers question.\n\n    Args:\n        state (dict): The current graph state\n\n    Returns:\n        str: Decision for next node to call\n    \"\"\"\n\n    print(\"---CHECK HALLUCINATIONS---\")\n    question = state[\"question\"]\n    documents = state[\"documents\"]\n    generation = state[\"generation\"]\n\n    score = hallucination_grader.invoke(\n        {\"documents\": documents, \"generation\": generation}\n    )\n    grade = score.binary_score\n\n    # Check hallucination\n    if grade == \"yes\":\n        print(\"---DECISION: GENERATION IS GROUNDED IN DOCUMENTS---\")\n        # Check question-answering\n        print(\"---GRADE GENERATION vs QUESTION---\")\n        score = answer_grader.invoke({\"question\": question, \"generation\": generation})\n        grade = score.binary_score\n        if grade == \"yes\":\n            print(\"---DECISION: GENERATION ADDRESSES QUESTION---\")\n            return \"useful\"\n        else:\n            print(\"---DECISION: GENERATION DOES NOT ADDRESS QUESTION---\")\n            return \"not useful\"\n    else:\n        pprint(\"---DECISION: GENERATION IS NOT GROUNDED IN DOCUMENTS, RE-TRY---\")\n        return \"not supported\""
+   ]
   },
   {
    "cell_type": "markdown",
@@ -331,7 +425,9 @@
      ]
     }
    ],
-   "source": ["from pprint import pprint\n\n# Run\ninputs = {\"question\": \"Movies that star Daniel Craig\"}\nfor output in app.stream(inputs):\n    for key, value in output.items():\n        # Node\n        pprint(f\"Node '{key}':\")\n    pprint(\"\\n---\\n\")\n\n# Final generation\npprint(value[\"generation\"])"]
+   "source": [
+    "from pprint import pprint\n\n# Run\ninputs = {\"question\": \"Movies that star Daniel Craig\"}\nfor output in app.stream(inputs):\n    for key, value in output.items():\n        # Node\n        pprint(f\"Node '{key}':\")\n    pprint(\"\\n---\\n\")\n\n# Final generation\npprint(value[\"generation\"])"
+   ]
   },
   {
    "cell_type": "code",
@@ -339,7 +435,9 @@
    "id": "4138bc51-8c84-4b8a-8d24-f7f470721f6f",
    "metadata": {},
    "outputs": [],
-   "source": ["inputs = {\"question\": \"Which movies are about aliens?\"}\nfor output in app.stream(inputs):\n    for key, value in output.items():\n        # Node\n        pprint(f\"Node '{key}':\")\n    pprint(\"\\n---\\n\")\n\n# Final generation\npprint(value[\"generation\"])"]
+   "source": [
+    "inputs = {\"question\": \"Which movies are about aliens?\"}\nfor output in app.stream(inputs):\n    for key, value in output.items():\n        # Node\n        pprint(f\"Node '{key}':\")\n    pprint(\"\\n---\\n\")\n\n# Final generation\npprint(value[\"generation\"])"
+   ]
   },
   {
    "cell_type": "code",
@@ -347,7 +445,9 @@
    "id": "42369ab8-322d-434a-b5dd-2266e4cb2903",
    "metadata": {},
    "outputs": [],
-   "source": [""]
+   "source": [
+    ""
+   ]
   }
  ],
  "metadata": {

libs/checkpoint-postgres/README.md

@@ -13,6 +13,20 @@ By default `langgraph-checkpoint-postgres` installs `psycopg` (Psycopg 3) withou
 
 > [!IMPORTANT]
 > When manually creating Postgres connections and passing them to `PostgresSaver` or `AsyncPostgresSaver`, make sure to include `autocommit=True` and `row_factory=dict_row` (`from psycopg.rows import dict_row`). See a full example in this [how-to guide](https://langchain-ai.github.io/langgraph/how-tos/persistence_postgres/).
+>
+> **Why these parameters are required:**
+> - `autocommit=True`: Required for the `.setup()` method to properly commit the checkpoint tables to the database. Without this, table creation may not be persisted.
+> - `row_factory=dict_row`: Required because the PostgresSaver implementation accesses database rows using dictionary-style syntax (e.g., `row["column_name"]`). The default `tuple_row` factory returns tuples that only support index-based access (e.g., `row[0]`), which will cause `TypeError` exceptions when the checkpointer tries to access columns by name.
+>
+> **Example of incorrect usage:**
+> ```python
+> # ❌ This will fail with TypeError during checkpointer operations
+> with psycopg.connect(DB_URI) as conn:  # Missing autocommit=True and row_factory=dict_row
+>     checkpointer = PostgresSaver(conn)
+>     checkpointer.setup()  # May not persist tables properly
+>     # Any operation that reads from database will fail with:
+>     # TypeError: tuple indices must be integers or slices, not str
+> ```
 
 ```python
 from langgraph.checkpoint.postgres import PostgresSaver

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

@@ -175,32 +175,7 @@ class PostgresSaver(BasePostgresSaver):
                             value["channel_values"],
                         )
             for value in values:
-                yield CheckpointTuple(
-                    {
-                        "configurable": {
-                            "thread_id": value["thread_id"],
-                            "checkpoint_ns": value["checkpoint_ns"],
-                            "checkpoint_id": value["checkpoint_id"],
-                        }
-                    },
-                    {
-                        **value["checkpoint"],
-                        "channel_values": self._load_blobs(value["channel_values"]),
-                    },
-                    value["metadata"],
-                    (
-                        {
-                            "configurable": {
-                                "thread_id": value["thread_id"],
-                                "checkpoint_ns": value["checkpoint_ns"],
-                                "checkpoint_id": value["parent_checkpoint_id"],
-                            }
-                        }
-                        if value["parent_checkpoint_id"]
-                        else None
-                    ),
-                    self._load_writes(value["pending_writes"]),
-                )
+                yield self._load_checkpoint_tuple(value)
 
     def get_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the database.
@@ -271,32 +246,7 @@ class PostgresSaver(BasePostgresSaver):
                         value["channel_values"],
                     )
 
-            return CheckpointTuple(
-                {
-                    "configurable": {
-                        "thread_id": thread_id,
-                        "checkpoint_ns": checkpoint_ns,
-                        "checkpoint_id": value["checkpoint_id"],
-                    }
-                },
-                {
-                    **value["checkpoint"],
-                    "channel_values": self._load_blobs(value["channel_values"]),
-                },
-                value["metadata"],
-                (
-                    {
-                        "configurable": {
-                            "thread_id": thread_id,
-                            "checkpoint_ns": checkpoint_ns,
-                            "checkpoint_id": value["parent_checkpoint_id"],
-                        }
-                    }
-                    if value["parent_checkpoint_id"]
-                    else None
-                ),
-                self._load_writes(value["pending_writes"]),
-            )
+            return self._load_checkpoint_tuple(value)
 
     def put(
         self,
@@ -466,5 +416,44 @@ class PostgresSaver(BasePostgresSaver):
                 with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
+        """
+        Convert a database row into a CheckpointTuple object.
+
+        Args:
+            value: A row from the database containing checkpoint data.
+
+        Returns:
+            CheckpointTuple: A structured representation of the checkpoint,
+            including its configuration, metadata, parent checkpoint (if any),
+            and pending writes.
+        """
+        return CheckpointTuple(
+            {
+                "configurable": {
+                    "thread_id": value["thread_id"],
+                    "checkpoint_ns": value["checkpoint_ns"],
+                    "checkpoint_id": value["checkpoint_id"],
+                }
+            },
+            {
+                **value["checkpoint"],
+                "channel_values": self._load_blobs(value["channel_values"]),
+            },
+            value["metadata"],
+            (
+                {
+                    "configurable": {
+                        "thread_id": value["thread_id"],
+                        "checkpoint_ns": value["checkpoint_ns"],
+                        "checkpoint_id": value["parent_checkpoint_id"],
+                    }
+                }
+                if value["parent_checkpoint_id"]
+                else None
+            ),
+            self._load_writes(value["pending_writes"]),
+        )
+
 
 __all__ = ["PostgresSaver", "BasePostgresSaver", "Conn"]

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

@@ -162,32 +162,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
                             value["channel_values"],
                         )
             for value in values:
-                yield CheckpointTuple(
-                    {
-                        "configurable": {
-                            "thread_id": value["thread_id"],
-                            "checkpoint_ns": value["checkpoint_ns"],
-                            "checkpoint_id": value["checkpoint_id"],
-                        }
-                    },
-                    {
-                        **value["checkpoint"],
-                        "channel_values": self._load_blobs(value["channel_values"]),
-                    },
-                    value["metadata"],
-                    (
-                        {
-                            "configurable": {
-                                "thread_id": value["thread_id"],
-                                "checkpoint_ns": value["checkpoint_ns"],
-                                "checkpoint_id": value["parent_checkpoint_id"],
-                            }
-                        }
-                        if value["parent_checkpoint_id"]
-                        else None
-                    ),
-                    await asyncio.to_thread(self._load_writes, value["pending_writes"]),
-                )
+                yield await self._load_checkpoint_tuple(value)
 
     async def aget_tuple(self, config: RunnableConfig) -> CheckpointTuple | None:
         """Get a checkpoint tuple from the database asynchronously.
@@ -238,32 +213,7 @@ class AsyncPostgresSaver(BasePostgresSaver):
                         value["channel_values"],
                     )
 
-            return CheckpointTuple(
-                {
-                    "configurable": {
-                        "thread_id": thread_id,
-                        "checkpoint_ns": checkpoint_ns,
-                        "checkpoint_id": value["checkpoint_id"],
-                    }
-                },
-                {
-                    **value["checkpoint"],
-                    "channel_values": self._load_blobs(value["channel_values"]),
-                },
-                value["metadata"],
-                (
-                    {
-                        "configurable": {
-                            "thread_id": thread_id,
-                            "checkpoint_ns": checkpoint_ns,
-                            "checkpoint_id": value["parent_checkpoint_id"],
-                        }
-                    }
-                    if value["parent_checkpoint_id"]
-                    else None
-                ),
-                await asyncio.to_thread(self._load_writes, value["pending_writes"]),
-            )
+            return await self._load_checkpoint_tuple(value)
 
     async def aput(
         self,
@@ -424,6 +374,45 @@ class AsyncPostgresSaver(BasePostgresSaver):
                 async with conn.cursor(binary=True, row_factory=dict_row) as cur:
                     yield cur
 
+    async def _load_checkpoint_tuple(self, value: DictRow) -> CheckpointTuple:
+        """
+        Convert a database row into a CheckpointTuple object.
+
+        Args:
+            value: A row from the database containing checkpoint data.
+
+        Returns:
+            CheckpointTuple: A structured representation of the checkpoint,
+            including its configuration, metadata, parent checkpoint (if any),
+            and pending writes.
+        """
+        return CheckpointTuple(
+            {
+                "configurable": {
+                    "thread_id": value["thread_id"],
+                    "checkpoint_ns": value["checkpoint_ns"],
+                    "checkpoint_id": value["checkpoint_id"],
+                }
+            },
+            {
+                **value["checkpoint"],
+                "channel_values": self._load_blobs(value["channel_values"]),
+            },
+            value["metadata"],
+            (
+                {
+                    "configurable": {
+                        "thread_id": value["thread_id"],
+                        "checkpoint_ns": value["checkpoint_ns"],
+                        "checkpoint_id": value["parent_checkpoint_id"],
+                    }
+                }
+                if value["parent_checkpoint_id"]
+                else None
+            ),
+            await asyncio.to_thread(self._load_writes, value["pending_writes"]),
+        )
+
     def list(
         self,
         config: RunnableConfig | None,

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

@@ -1317,12 +1317,12 @@ def _ensure_index_config(
     index_config = index_config.copy()
     tokenized: list[tuple[str, Literal["$"] | list[str]]] = []
     tot = 0
-    text_fields = index_config.get("fields") or ["$"]
-    if isinstance(text_fields, str):
-        text_fields = [text_fields]
-    if not isinstance(text_fields, list):
-        raise ValueError(f"Text fields must be a list or a string. Got {text_fields}")
-    for p in text_fields:
+    fields = index_config.get("fields") or ["$"]
+    if isinstance(fields, str):
+        fields = [fields]
+    if not isinstance(fields, list):
+        raise ValueError(f"Text fields must be a list or a string. Got {fields}")
+    for p in fields:
         if p == "$":
             tokenized.append((p, "$"))
             tot += 1

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

@@ -7,6 +7,7 @@ import json
 import pathlib
 import pickle
 import re
+import sys
 from collections import deque
 from collections.abc import Sequence
 from datetime import date, datetime, time, timedelta, timezone
@@ -251,6 +252,7 @@ EXT_CONSTRUCTOR_KW_ARGS = 2
 EXT_METHOD_SINGLE_ARG = 3
 EXT_PYDANTIC_V1 = 4
 EXT_PYDANTIC_V2 = 5
+EXT_NUMPY_ARRAY = 6
 
 
 def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
@@ -320,13 +322,6 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
                 (obj.__class__.__module__, obj.__class__.__name__, obj.hex),
             ),
         )
-    elif isinstance(obj, bytearray):
-        return ormsgpack.Ext(
-            EXT_CONSTRUCTOR_SINGLE_ARG,
-            _msgpack_enc(
-                (obj.__class__.__module__, obj.__class__.__name__, bytes(obj)),
-            ),
-        )
     elif isinstance(obj, decimal.Decimal):
         return ormsgpack.Ext(
             EXT_CONSTRUCTOR_SINGLE_ARG,
@@ -465,6 +460,22 @@ def _msgpack_default(obj: Any) -> str | ormsgpack.Ext:
                 ),
             ),
         )
+    elif (np_mod := sys.modules.get("numpy")) is not None and isinstance(
+        obj, np_mod.ndarray
+    ):
+        order = "F" if obj.flags.f_contiguous and not obj.flags.c_contiguous else "C"
+        if obj.flags.c_contiguous:
+            mv = memoryview(obj)
+            try:
+                meta = (obj.dtype.str, obj.shape, order, mv)
+                return ormsgpack.Ext(EXT_NUMPY_ARRAY, _msgpack_enc(meta))
+            finally:
+                mv.release()
+        else:
+            buf = obj.tobytes(order="A")
+            meta = (obj.dtype.str, obj.shape, order, buf)
+            return ormsgpack.Ext(EXT_NUMPY_ARRAY, _msgpack_enc(meta))
+
     elif isinstance(obj, BaseException):
         return repr(obj)
     else:
@@ -546,6 +557,17 @@ def _msgpack_ext_hook(code: int, data: bytes) -> Any:
                 return tup[2]
             except NameError:
                 return
+    elif code == EXT_NUMPY_ARRAY:
+        try:
+            import numpy as _np
+
+            dtype_str, shape, order, buf = ormsgpack.unpackb(
+                data, ext_hook=_msgpack_ext_hook, option=ormsgpack.OPT_NON_STR_KEYS
+            )
+            arr = _np.frombuffer(buf, dtype=_np.dtype(dtype_str))
+            return arr.reshape(shape, order=order)
+        except Exception:
+            return
 
 
 def _msgpack_ext_hook_to_json(code: int, data: bytes) -> Any:
@@ -626,6 +648,19 @@ def _msgpack_ext_hook_to_json(code: int, data: bytes) -> Any:
             return tup[2]
         except Exception:
             return
+    elif code == EXT_NUMPY_ARRAY:
+        try:
+            import numpy as _np
+
+            dtype_str, shape, order, buf = ormsgpack.unpackb(
+                data,
+                ext_hook=_msgpack_ext_hook_to_json,
+                option=ormsgpack.OPT_NON_STR_KEYS,
+            )
+            arr = _np.frombuffer(buf, dtype=_np.dtype(dtype_str))
+            return arr.reshape(shape, order=order).tolist()
+        except Exception:
+            return
 
 
 _option = (

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

@@ -496,7 +496,7 @@ def _cosine_similarity(X: list[float], Y: list[list[float]]) -> list[float]:
     if not Y:
         return []
     if _check_numpy():
-        import numpy as np  # type: ignore[import-not-found]
+        import numpy as np
 
         X_arr = np.array(X) if not isinstance(X, np.ndarray) else X
         Y_arr = np.array(Y) if not isinstance(Y, np.ndarray) else Y

libs/checkpoint/pyproject.toml

@@ -13,7 +13,7 @@ license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
     "langchain-core>=0.2.38",
-    "ormsgpack>=1.8.0",
+    "ormsgpack>=1.10.0",
 ]
 
 [project.urls]
@@ -29,6 +29,8 @@ dev = [
   "pytest-watcher",
   "mypy",
   "dataclasses-json",
+  "numpy",
+  "pandas",
 ]
 
 [tool.hatch.build.targets.wheel]

libs/checkpoint/tests/test_jsonplus.py

@@ -11,6 +11,9 @@ from ipaddress import IPv4Address
 from zoneinfo import ZoneInfo
 
 import dataclasses_json
+import numpy as np
+import pandas as pd
+import pytest
 from pydantic import BaseModel, SecretStr
 from pydantic.v1 import BaseModel as BaseModelV1
 from pydantic.v1 import SecretStr as SecretStrV1
@@ -295,19 +298,174 @@ def test_serde_jsonplus_bytearray() -> None:
     assert serde.loads_typed(dumped) == some_bytearray
 
 
-def test_loads_cannot_find() -> None:
+@pytest.mark.parametrize(
+    "arr",
+    [
+        np.arange(9, dtype=np.int32).reshape(3, 3),
+        np.asfortranarray(np.arange(9, dtype=np.float64).reshape(3, 3)),
+        np.arange(12, dtype=np.int16)[::2].reshape(3, 2),
+    ],
+)
+def test_serde_jsonplus_numpy_array(arr: np.ndarray) -> None:
     serde = JsonPlusSerializer()
 
-    dumped = (
-        "json",
-        b'{"lc": 2, "type": "constructor", "id": ["tests", "test_jsonplus", "MyPydanticccc"], "method": null, "args": [], "kwargs": {"foo": "foo", "bar": 1}}',
-    )
+    dumped = serde.dumps_typed(arr)
+    assert dumped[0] == "msgpack"
+    result = serde.loads_typed(dumped)
+    assert isinstance(result, np.ndarray)
+    assert result.dtype == arr.dtype
+    assert np.array_equal(result, arr)
 
-    assert serde.loads_typed(dumped) is None, "Should return None if cannot find class"
 
-    dumped = (
-        "json",
-        b'{"lc": 2, "type": "constructor", "id": ["tests", "test_jsonpluss", "MyPydantic"], "method": null, "args": [], "kwargs": {"foo": "foo", "bar": 1}}',
-    )
+@pytest.mark.parametrize(
+    "arr",
+    [
+        np.arange(6, dtype=np.float32).reshape(2, 3),
+        np.asfortranarray(np.arange(4, dtype=np.complex128).reshape(2, 2)),
+    ],
+)
+def test_serde_jsonplus_numpy_array_json_hook(arr: np.ndarray) -> None:
+    serde = JsonPlusSerializer(__unpack_ext_hook__=_msgpack_ext_hook_to_json)
+    dumped = serde.dumps_typed(arr)
+    assert dumped[0] == "msgpack"
+    result = serde.loads_typed(dumped)
+    assert isinstance(result, list)
+    assert result == arr.tolist()
 
-    assert serde.loads_typed(dumped) is None, "Should return None if cannot find module"
+
+@pytest.mark.parametrize(
+    "df",
+    [
+        pd.DataFrame(),
+        pd.DataFrame({"int_col": [1, 2, 3]}),
+        pd.DataFrame({"float_col": [1.1, 2.2, 3.3]}),
+        pd.DataFrame({"str_col": ["a", "b", "c"]}),
+        pd.DataFrame({"bool_col": [True, False, True]}),
+        pd.DataFrame(
+            {
+                "datetime_col": [
+                    datetime(2024, 1, 1),
+                    datetime(2024, 1, 2),
+                    datetime(2024, 1, 3),
+                ]
+            }
+        ),
+        pd.DataFrame(
+            {
+                "int_col": [1, 2, 3],
+                "float_col": [1.1, 2.2, 3.3],
+                "str_col": ["a", "b", "c"],
+            }
+        ),
+        pd.DataFrame(
+            {
+                "int_col": [1, 2, None],
+                "float_col": [1.1, None, 3.3],
+                "str_col": ["a", None, "c"],
+            }
+        ),
+        pd.DataFrame({"cat_col": pd.Categorical(["a", "b", "a", "c"])}),
+        pd.DataFrame(
+            {
+                "int8": pd.array([1, 2, 3], dtype="int8"),
+                "int16": pd.array([10, 20, 30], dtype="int16"),
+                "int32": pd.array([100, 200, 300], dtype="int32"),
+                "int64": pd.array([1000, 2000, 3000], dtype="int64"),
+                "float32": pd.array([1.1, 2.2, 3.3], dtype="float32"),
+                "float64": pd.array([10.1, 20.2, 30.3], dtype="float64"),
+            }
+        ),
+        pd.DataFrame({"value": [1, 2, 3]}, index=["x", "y", "z"]),
+        pd.DataFrame(
+            [[1, 2, 3, 4]],
+            columns=pd.MultiIndex.from_tuples(
+                [("A", "X"), ("A", "Y"), ("B", "X"), ("B", "Y")]
+            ),
+        ),
+        pd.DataFrame(
+            {"value": [1, 2, 3]}, index=pd.date_range("2024-01-01", periods=3, freq="D")
+        ),
+        pd.DataFrame(
+            {
+                "col1": range(1000),
+                "col2": [f"str_{i}" for i in range(1000)],
+                "col3": np.random.rand(1000),
+            }
+        ),
+        pd.DataFrame(
+            {"tz_datetime": pd.date_range("2024-01-01", periods=3, freq="D", tz="UTC")}
+        ),
+        pd.DataFrame({"timedelta": pd.to_timedelta([1, 2, 3], unit="D")}),
+        pd.DataFrame({"period": pd.period_range("2024-01", periods=3, freq="M")}),
+        pd.DataFrame({"interval": pd.interval_range(start=0, end=3, periods=3)}),
+        pd.DataFrame({"unicode": ["Hello 🌍", "Python 🐍", "Data 📊"]}),
+        pd.DataFrame({"mixed": [1, "string", [1, 2, 3], {"key": "value"}]}),
+        pd.DataFrame({"a": [1], "b": ["test"], "c": [3.14]}),
+        pd.DataFrame({"single": [42]}),
+        pd.DataFrame(
+            {
+                "small": [sys.float_info.min, 0, sys.float_info.max],
+                "large_int": [-(2**63), 0, 2**63 - 1],
+            }
+        ),
+        pd.DataFrame({"special_strings": ["", "null", "None", "NaN", "inf", "-inf"]}),
+        pd.DataFrame({"bytes_col": [b"hello", b"world", b"\x00\x01\x02"]}),
+    ],
+)
+def test_serde_jsonplus_pandas_dataframe(df: pd.DataFrame) -> None:
+    serde = JsonPlusSerializer(pickle_fallback=True)
+
+    dumped = serde.dumps_typed(df)
+    assert dumped[0] == "pickle"
+    result = serde.loads_typed(dumped)
+    assert result.equals(df)
+
+
+@pytest.mark.parametrize(
+    "series",
+    [
+        pd.Series([]),
+        pd.Series([1, 2, 3]),
+        pd.Series([1.1, 2.2, 3.3]),
+        pd.Series(["a", "b", "c"]),
+        pd.Series([True, False, True]),
+        pd.Series([datetime(2024, 1, 1), datetime(2024, 1, 2), datetime(2024, 1, 3)]),
+        pd.Series([1, 2, None]),
+        pd.Series([1.1, None, 3.3]),
+        pd.Series(["a", None, "c"]),
+        pd.Series(pd.Categorical(["a", "b", "a", "c"])),
+        pd.Series([1, 2, 3], dtype="int8"),
+        pd.Series([10, 20, 30], dtype="int16"),
+        pd.Series([100, 200, 300], dtype="int32"),
+        pd.Series([1000, 2000, 3000], dtype="int64"),
+        pd.Series([1.1, 2.2, 3.3], dtype="float32"),
+        pd.Series([10.1, 20.2, 30.3], dtype="float64"),
+        pd.Series([1, 2, 3], index=["x", "y", "z"]),
+        pd.Series([1, 2, 3], index=pd.date_range("2024-01-01", periods=3, freq="D")),
+        pd.Series(range(1000)),
+        pd.Series(pd.date_range("2024-01-01", periods=3, freq="D", tz="UTC")),
+        pd.Series(pd.to_timedelta([1, 2, 3], unit="D")),
+        pd.Series(pd.period_range("2024-01", periods=3, freq="M")),
+        pd.Series(pd.interval_range(start=0, end=3, periods=3)),
+        pd.Series(["Hello 🌍", "Python 🐍", "Data 📊"]),
+        pd.Series([1, "string", [1, 2, 3], {"key": "value"}]),
+        pd.Series([42], name="single"),
+        pd.Series([sys.float_info.min, 0, sys.float_info.max]),
+        pd.Series([-(2**63), 0, 2**63 - 1]),
+        pd.Series(["", "null", "None", "NaN", "inf", "-inf"]),
+        pd.Series([b"hello", b"world", b"\x00\x01\x02"]),
+        pd.Series([1, 2, 3], name="named_series"),
+        pd.Series(
+            [10, 20],
+            index=pd.MultiIndex.from_tuples([("a", 1), ("b", 2)], names=["x", "y"]),
+        ),
+    ],
+)
+def test_serde_jsonplus_pandas_series(series: pd.Series) -> None:
+    serde = JsonPlusSerializer(pickle_fallback=True)
+    dumped = serde.dumps_typed(series)
+
+    assert dumped[0] == "pickle"
+    result = serde.loads_typed(dumped)
+
+    assert result.equals(series)

libs/checkpoint/uv.lock

@@ -3,7 +3,10 @@ revision = 1
 requires-python = ">=3.9"
 resolution-markers = [
     "python_full_version >= '3.12.4'",
-    "python_full_version < '3.12.4'",
+    "python_full_version >= '3.12' and python_full_version < '3.12.4'",
+    "python_full_version == '3.11.*'",
+    "python_full_version == '3.10.*'",
+    "python_full_version < '3.10'",
 ]
 
 [[package]]
@@ -218,7 +221,7 @@ name = "exceptiongroup"
 version = "1.3.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
-    { name = "typing-extensions", marker = "python_full_version < '3.12.4'" },
+    { name = "typing-extensions", marker = "python_full_version < '3.11'" },
 ]
 sdist = { url = "https://files.pythonhosted.org/packages/0b/9f/a65090624ecf468cdca03533906e7c69ed7588582240cfe7cc9e770b50eb/exceptiongroup-1.3.0.tar.gz", hash = "sha256:b241f5885f560bc56a59ee63ca4c6a8bfa46ae4ad651af316d4e81817bb9fd88", size = 29749 }
 wheels = [
@@ -333,6 +336,10 @@ dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
     { name = "mypy" },
+    { name = "numpy", version = "2.0.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.10'" },
+    { name = "numpy", version = "2.2.6", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.10.*'" },
+    { name = "numpy", version = "2.3.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
+    { name = "pandas" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
@@ -343,7 +350,7 @@ dev = [
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-    { name = "ormsgpack", specifier = ">=1.8.0" },
+    { name = "ormsgpack", specifier = ">=1.10.0" },
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@@ -351,6 +358,8 @@ dev = [
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     { name = "dataclasses-json" },
     { name = "mypy" },
+    { name = "numpy" },
+    { name = "pandas" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
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+    { url = "https://files.pythonhosted.org/packages/0a/bf/25018e431257f8a42c173080f9da7c592508269def54af4a76ccd1c14420/pandas-2.3.0-cp39-cp39-musllinux_1_2_x86_64.whl", hash = "sha256:e0f51973ba93a9f97185049326d75b942b9aeb472bec616a129806facb129ebb", size = 13696374 },
+    { url = "https://files.pythonhosted.org/packages/db/84/5ffd2c447c02db56326f5c19a235a747fae727e4842cc20e1ddd28f990f6/pandas-2.3.0-cp39-cp39-win_amd64.whl", hash = "sha256:b198687ca9c8529662213538a9bb1e60fa0bf0f6af89292eb68fea28743fcd5a", size = 11104735 },
+]
+
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 name = "pluggy"
 version = "1.6.0"
@@ -774,6 +1023,27 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/5b/3a/c44a76c6bb5e9e896d9707fb1c704a31a0136950dec9514373ced0684d56/pytest_watcher-0.4.3-py3-none-any.whl", hash = "sha256:d59b1e1396f33a65ea4949b713d6884637755d641646960056a90b267c3460f9", size = 11852 },
 ]
 
+[[package]]
+name = "python-dateutil"
+version = "2.9.0.post0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "six" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/66/c0/0c8b6ad9f17a802ee498c46e004a0eb49bc148f2fd230864601a86dcf6db/python-dateutil-2.9.0.post0.tar.gz", hash = "sha256:37dd54208da7e1cd875388217d5e00ebd4179249f90fb72437e91a35459a0ad3", size = 342432 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/ec/57/56b9bcc3c9c6a792fcbaf139543cee77261f3651ca9da0c93f5c1221264b/python_dateutil-2.9.0.post0-py2.py3-none-any.whl", hash = "sha256:a8b2bc7bffae282281c8140a97d3aa9c14da0b136dfe83f850eea9a5f7470427", size = 229892 },
+]
+
+[[package]]
+name = "pytz"
+version = "2025.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/f8/bf/abbd3cdfb8fbc7fb3d4d38d320f2441b1e7cbe29be4f23797b4a2b5d8aac/pytz-2025.2.tar.gz", hash = "sha256:360b9e3dbb49a209c21ad61809c7fb453643e048b38924c765813546746e81c3", size = 320884 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/81/c4/34e93fe5f5429d7570ec1fa436f1986fb1f00c3e0f43a589fe2bbcd22c3f/pytz-2025.2-py2.py3-none-any.whl", hash = "sha256:5ddf76296dd8c44c26eb8f4b6f35488f3ccbf6fbbd7adee0b7262d43f0ec2f00", size = 509225 },
+]
+
 [[package]]
 name = "pyyaml"
 version = "6.0.2"
@@ -879,6 +1149,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/95/3a/2e8704d19f376c799748ff9cb041225c1d59f3e7711bc5596c8cfdc24925/ruff-0.11.10-py3-none-win_arm64.whl", hash = "sha256:ef69637b35fb8b210743926778d0e45e1bffa850a7c61e428c6b971549b5f5d1", size = 10765278 },
 ]
 
+[[package]]
+name = "six"
+version = "1.17.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/94/e7/b2c673351809dca68a0e064b6af791aa332cf192da575fd474ed7d6f16a2/six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81", size = 34031 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/b7/ce/149a00dd41f10bc29e5921b496af8b574d8413afcd5e30dfa0ed46c2cc5e/six-1.17.0-py2.py3-none-any.whl", hash = "sha256:4721f391ed90541fddacab5acf947aa0d3dc7d27b2e1e8eda2be8970586c3274", size = 11050 },
+]
+
 [[package]]
 name = "sniffio"
 version = "1.3.1"
@@ -970,6 +1249,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/31/08/aa4fdfb71f7de5176385bd9e90852eaf6b5d622735020ad600f2bab54385/typing_inspection-0.4.0-py3-none-any.whl", hash = "sha256:50e72559fcd2a6367a19f7a7e610e6afcb9fac940c650290eed893d61386832f", size = 14125 },
 ]
 
+[[package]]
+name = "tzdata"
+version = "2025.2"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/95/32/1a225d6164441be760d75c2c42e2780dc0873fe382da3e98a2e1e48361e5/tzdata-2025.2.tar.gz", hash = "sha256:b60a638fcc0daffadf82fe0f57e53d06bdec2f36c4df66280ae79bce6bd6f2b9", size = 196380 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/5c/23/c7abc0ca0a1526a0774eca151daeb8de62ec457e77262b66b359c3c7679e/tzdata-2025.2-py2.py3-none-any.whl", hash = "sha256:1a403fada01ff9221ca8044d701868fa132215d84beb92242d9acd2147f667a8", size = 347839 },
+]
+
 [[package]]
 name = "urllib3"
 version = "2.4.0"

libs/cli/examples/graphs/storm.py

@@ -22,10 +22,10 @@ from langgraph.graph import END, StateGraph
 from pydantic import BaseModel, Field
 from typing_extensions import TypedDict
 
-fast_llm = ChatOpenAI(model="gpt-3.5-turbo")
+fast_llm = ChatOpenAI(model="gpt-4o-mini")
 # Uncomment for a Fireworks model
 # fast_llm = ChatFireworks(model="accounts/fireworks/models/firefunction-v1", max_tokens=32_000)
-long_context_llm = ChatOpenAI(model="gpt-4-turbo-preview")
+long_context_llm = ChatOpenAI(model="gpt-4o")
 
 
 direct_gen_outline_prompt = ChatPromptTemplate.from_messages(
@@ -144,7 +144,7 @@ gen_perspectives_prompt = ChatPromptTemplate.from_messages(
 )
 
 gen_perspectives_chain = gen_perspectives_prompt | ChatOpenAI(
-    model="gpt-3.5-turbo"
+    model="gpt-4o-mini"
 ).with_structured_output(Perspectives)
 
 
@@ -270,7 +270,7 @@ gen_queries_prompt = ChatPromptTemplate.from_messages(
     ]
 )
 gen_queries_chain = gen_queries_prompt | ChatOpenAI(
-    model="gpt-3.5-turbo"
+    model="gpt-4o-mini"
 ).with_structured_output(Queries, include_raw=True)
 
 

libs/cli/langgraph_cli/config.py

@@ -383,6 +383,14 @@ class Config(TypedDict, total=False):
     Only relevant if Python dependencies are installed via pip. If omitted, default pip settings are used.
     """
 
+    pip_installer: Optional[str]
+    """Optional. Python package installer to use ('auto', 'pip', 'uv').
+    
+    - 'auto' (default): Use uv for supported base images, otherwise pip
+    - 'pip': Force use of pip regardless of base image support
+    - 'uv': Force use of uv (will fail if base image doesn't support it)
+    """
+
     dockerfile_lines: list[str]
     """Optional. Additional Docker instructions that will be appended to your base Dockerfile.
     
@@ -536,6 +544,7 @@ def validate_config(config: Config) -> Config:
         "node_version": node_version,
         "python_version": python_version,
         "pip_config_file": config.get("pip_config_file"),
+        "pip_installer": config.get("pip_installer", "auto"),
         "_INTERNAL_docker_tag": config.get("_INTERNAL_docker_tag"),
         "base_image": config.get("base_image"),
         "image_distro": image_distro,
@@ -600,6 +609,13 @@ def validate_config(config: Config) -> Config:
                 "Must be either 'debian' or 'wolfi'."
             )
 
+    if pip_installer := config.get("pip_installer"):
+        if pip_installer not in ["auto", "pip", "uv"]:
+            raise click.UsageError(
+                f"Invalid pip_installer: '{pip_installer}'. "
+                "Must be 'auto', 'pip', or 'uv'."
+            )
+
     # Validate auth config
     if auth_conf := config.get("auth"):
         if "path" in auth_conf:
@@ -1114,12 +1130,21 @@ def python_config_to_docker(
     base_image: str,
 ) -> tuple[str, dict[str, str]]:
     """Generate a Dockerfile from the configuration."""
-    if _image_supports_uv(base_image):
+    pip_installer = config.get("pip_installer", "auto")
+
+    if pip_installer == "uv":
         install_cmd = "uv pip install --system"
         uv_removal = "RUN uv pip uninstall --system pip setuptools wheel && rm /usr/bin/uv /usr/bin/uvx"
-    else:
+    elif pip_installer == "pip":
         install_cmd = "pip install"
         uv_removal = ""
+    else:
+        if _image_supports_uv(base_image):
+            install_cmd = "uv pip install --system"
+            uv_removal = "RUN uv pip uninstall --system pip setuptools wheel && rm /usr/bin/uv /usr/bin/uvx"
+        else:
+            install_cmd = "pip install"
+            uv_removal = ""
 
     # configure pip
     pip_install = f"PYTHONDONTWRITEBYTECODE=1 {install_cmd} --no-cache-dir -c /api/constraints.txt"

libs/cli/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-cli"
-version = "0.3.1"
+version = "0.3.2"
 description = "CLI for interacting with LangGraph API"
 authors = []
 requires-python = ">=3.9"

libs/cli/schemas/schema.json

@@ -134,6 +134,17 @@
               ],
               "description": "Optional. Linux distribution for the base image.\n\nMust be either 'debian' or 'wolfi'. If omitted, defaults to 'debian'.\n"
             },
+            "pip_installer": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Optional. Python package installer to use ('auto', 'pip', 'uv').\n\n"
+            },
             "store": {
               "anyOf": [
                 {
@@ -287,6 +298,17 @@
               ],
               "description": "Optional. Linux distribution for the base image.\n\nMust be either 'debian' or 'wolfi'. If omitted, defaults to 'debian'.\n"
             },
+            "pip_installer": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Optional. Python package installer to use ('auto', 'pip', 'uv').\n\n"
+            },
             "store": {
               "anyOf": [
                 {

libs/cli/schemas/schema.v0.json

@@ -134,6 +134,17 @@
               ],
               "description": "Optional. Linux distribution for the base image.\n\nMust be either 'debian' or 'wolfi'. If omitted, defaults to 'debian'.\n"
             },
+            "pip_installer": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Optional. Python package installer to use ('auto', 'pip', 'uv').\n\n"
+            },
             "store": {
               "anyOf": [
                 {
@@ -287,6 +298,17 @@
               ],
               "description": "Optional. Linux distribution for the base image.\n\nMust be either 'debian' or 'wolfi'. If omitted, defaults to 'debian'.\n"
             },
+            "pip_installer": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Optional. Python package installer to use ('auto', 'pip', 'uv').\n\n"
+            },
             "store": {
               "anyOf": [
                 {

libs/cli/tests/unit_tests/test_config.py

@@ -1,3 +1,4 @@
+import copy
 import json
 import os
 import pathlib
@@ -40,6 +41,7 @@ def test_validate_config():
         "python_version": "3.11",
         "node_version": None,
         "pip_config_file": None,
+        "pip_installer": "auto",
         "image_distro": "debian",
         "dockerfile_lines": [],
         "env": {},
@@ -61,6 +63,7 @@ def test_validate_config():
         "python_version": "3.12",
         "node_version": None,
         "pip_config_file": "pipconfig.txt",
+        "pip_installer": "auto",
         "image_distro": "debian",
         "dockerfile_lines": ["ARG meow"],
         "dependencies": [".", "langchain"],
@@ -216,6 +219,74 @@ def test_validate_config_image_distro():
     assert config["image_distro"] == "debian"
 
 
+def test_validate_config_pip_installer():
+    """Test validation of pip_installer field."""
+    # Valid pip_installer values should work
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "pip_installer": "auto",
+        }
+    )
+    assert config["pip_installer"] == "auto"
+
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "pip_installer": "pip",
+        }
+    )
+    assert config["pip_installer"] == "pip"
+
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+            "pip_installer": "uv",
+        }
+    )
+    assert config["pip_installer"] == "uv"
+
+    # Missing pip_installer should default to "auto"
+    config = validate_config(
+        {
+            "python_version": "3.11",
+            "dependencies": ["."],
+            "graphs": {"agent": "./agent.py:graph"},
+        }
+    )
+    assert config["pip_installer"] == "auto"
+
+    # Invalid pip_installer values should raise error
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config(
+            {
+                "python_version": "3.11",
+                "dependencies": ["."],
+                "graphs": {"agent": "./agent.py:graph"},
+                "pip_installer": "conda",
+            }
+        )
+    assert "Invalid pip_installer: 'conda'" in str(exc_info.value)
+    assert "Must be 'auto', 'pip', or 'uv'" in str(exc_info.value)
+
+    with pytest.raises(click.UsageError) as exc_info:
+        validate_config(
+            {
+                "python_version": "3.11",
+                "dependencies": ["."],
+                "graphs": {"agent": "./agent.py:graph"},
+                "pip_installer": "invalid",
+            }
+        )
+    assert "Invalid pip_installer: 'invalid'" in str(exc_info.value)
+
+
 def test_validate_config_file():
     with tempfile.TemporaryDirectory() as tmpdir:
         tmpdir_path = pathlib.Path(tmpdir)
@@ -799,6 +870,61 @@ WORKDIR /deps/__outer_unit_tests/unit_tests"""
     assert additional_contexts == {}
 
 
+def test_config_to_docker_pip_installer():
+    """Test that pip_installer setting affects the generated Dockerfile."""
+    graphs = {"agent": "./graphs/agent.py:graph"}
+    base_config = {
+        "python_version": "3.11",
+        "dependencies": ["."],
+        "graphs": graphs,
+    }
+
+    # Test default (auto) behavior with UV-supporting image
+    config_auto = validate_config(
+        {**copy.deepcopy(base_config), "pip_installer": "auto"}
+    )
+    docker_auto, _ = config_to_docker(
+        PATH_TO_CONFIG, config_auto, "langchain/langgraph-api:0.2.47"
+    )
+    assert "uv pip install --system" in docker_auto
+    assert "rm /usr/bin/uv /usr/bin/uvx" in docker_auto
+
+    # Test explicit pip setting
+    config_pip = validate_config({**copy.deepcopy(base_config), "pip_installer": "pip"})
+    docker_pip, _ = config_to_docker(
+        PATH_TO_CONFIG, config_pip, "langchain/langgraph-api:0.2.47"
+    )
+    assert "uv pip install --system" not in docker_pip
+    assert "pip install" in docker_pip
+    assert "rm /usr/bin/uv" not in docker_pip
+
+    # Test explicit uv setting
+    config_uv = validate_config({**copy.deepcopy(base_config), "pip_installer": "uv"})
+    docker_uv, _ = config_to_docker(
+        PATH_TO_CONFIG, config_uv, "langchain/langgraph-api:0.2.47"
+    )
+    assert "uv pip install --system" in docker_uv
+    assert "rm /usr/bin/uv /usr/bin/uvx" in docker_uv
+
+    # Test auto behavior with older image (should use pip)
+    config_auto_old = validate_config(
+        {**copy.deepcopy(base_config), "pip_installer": "auto"}
+    )
+    docker_auto_old, _ = config_to_docker(
+        PATH_TO_CONFIG, config_auto_old, "langchain/langgraph-api:0.2.46"
+    )
+    assert "uv pip install --system" not in docker_auto_old
+    assert "pip install" in docker_auto_old
+    assert "rm /usr/bin/uv" not in docker_auto_old
+
+    # Test that missing pip_installer defaults to auto behavior
+    config_default = validate_config(copy.deepcopy(base_config))
+    docker_default, _ = config_to_docker(
+        PATH_TO_CONFIG, config_default, "langchain/langgraph-api:0.2.47"
+    )
+    assert "uv pip install --system" in docker_default
+
+
 # config_to_compose
 def test_config_to_compose_simple_config():
     graphs = {"agent": "./agent.py:graph"}

libs/cli/uv.lock

@@ -501,7 +501,7 @@ wheels = [
 
 [[package]]
 name = "langgraph-cli"
-version = "0.3.1"
+version = "0.3.2"
 source = { editable = "." }
 dependencies = [
     { name = "click" },

libs/langgraph/README.md

@@ -12,7 +12,6 @@
 [![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/)
-[![GitMCP](https://img.shields.io/endpoint?url=https://gitmcp.io/badge/langchain-ai/langgraph)](https://gitmcp.io/langchain-ai/langgraph)
 
 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.
 

libs/langgraph/langgraph/constants.py

@@ -39,8 +39,6 @@ ERROR = sys.intern("__error__")
 # for errors raised by nodes
 NO_WRITES = sys.intern("__no_writes__")
 # marker to signal node didn't write anything
-SCHEDULED = sys.intern("__scheduled__")
-# marker to signal node was scheduled (in distributed mode)
 TASKS = sys.intern("__pregel_tasks")
 # for Send objects returned by nodes/edges, corresponds to PUSH below
 RETURN = sys.intern("__return__")
@@ -71,13 +69,6 @@ CONFIG_KEY_RESUMING = sys.intern("__pregel_resuming")
 # holds a boolean indicating if subgraphs should resume from a previous checkpoint
 CONFIG_KEY_TASK_ID = sys.intern("__pregel_task_id")
 # holds the task ID for the current task
-CONFIG_KEY_DEDUPE_TASKS = sys.intern("__pregel_dedupe_tasks")
-# holds a boolean indicating if tasks should be deduplicated (for distributed mode)
-CONFIG_KEY_ENSURE_LATEST = sys.intern("__pregel_ensure_latest")
-# holds a boolean indicating whether to assert the requested checkpoint is the latest
-# (for distributed mode)
-CONFIG_KEY_DELEGATE = sys.intern("__pregel_delegate")
-# holds a boolean indicating whether to delegate subgraphs (for distributed mode)
 CONFIG_KEY_THREAD_ID = sys.intern("thread_id")
 # holds the thread ID for the current invocation
 CONFIG_KEY_CHECKPOINT_MAP = sys.intern("checkpoint_map")
@@ -121,7 +112,6 @@ RESERVED = {
     RESUME,
     ERROR,
     NO_WRITES,
-    SCHEDULED,
     # reserved config.configurable keys
     CONFIG_KEY_SEND,
     CONFIG_KEY_READ,
@@ -132,9 +122,6 @@ RESERVED = {
     CONFIG_KEY_CHECKPOINT_MAP,
     CONFIG_KEY_RESUMING,
     CONFIG_KEY_TASK_ID,
-    CONFIG_KEY_DEDUPE_TASKS,
-    CONFIG_KEY_ENSURE_LATEST,
-    CONFIG_KEY_DELEGATE,
     CONFIG_KEY_CHECKPOINT_MAP,
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_NS,

libs/langgraph/langgraph/errors.py

@@ -78,13 +78,6 @@ class NodeInterrupt(GraphInterrupt):
         super().__init__([Interrupt(value=value)])
 
 
-class GraphDelegate(GraphBubbleUp):
-    """Raised when a graph is delegated (for distributed mode)."""
-
-    def __init__(self, *args: dict[str, Any]) -> None:
-        super().__init__(*args)
-
-
 class ParentCommand(GraphBubbleUp):
     args: tuple[Command]
 
@@ -102,9 +95,3 @@ class TaskNotFound(Exception):
     """Raised when the executor is unable to find a task (for distributed mode)."""
 
     pass
-
-
-class CheckpointNotLatest(Exception):
-    """Raised when the checkpoint is not the latest version (for distributed mode)."""
-
-    pass

libs/langgraph/langgraph/func/__init__.py

@@ -499,7 +499,7 @@ class entrypoint:
                 func.__name__: PregelNode(
                     bound=bound,
                     triggers=[START],
-                    channels=[START],
+                    channels=START,
                     writers=[
                         ChannelWrite(
                             [

libs/langgraph/langgraph/graph/state.py

@@ -849,13 +849,6 @@ class StateGraph(Generic[StateT, InputT, OutputT]):
             builder=self,
             schema_to_mapper={},
             config_type=self.config_schema,
-            input_model=(
-                self.input_schema
-                if len(self.channels) > 1
-                and isclass(self.input_schema)
-                and issubclass(self.input_schema, BaseModel)
-                else None
-            ),
             nodes={},
             channels={
                 **self.channels,
@@ -996,20 +989,17 @@ class CompiledStateGraph(
             self.nodes[key] = PregelNode(
                 tags=[TAG_HIDDEN],
                 triggers=[START],
-                channels=[START],
+                channels=START,
                 writers=[ChannelWrite(write_entries)],
             )
         elif node is not None:
             input_schema = node.input if node else self.builder._state_schema
-            input_values = {k: k for k in self.builder.schemas[input_schema]}
-            is_single_input = len(input_values) == 1 and "__root__" in input_values
+            input_channels = list(self.builder.schemas[input_schema])
+            is_single_input = len(input_channels) == 1 and "__root__" in input_channels
             if input_schema in self.schema_to_mapper:
                 mapper = self.schema_to_mapper[input_schema]
             else:
-                mapper = _pick_mapper(
-                    list(input_values),
-                    input_schema,
-                )
+                mapper = _pick_mapper(input_channels, input_schema)
                 self.schema_to_mapper[input_schema] = mapper
 
             branch_channel = CHANNEL_BRANCH_TO.format(key)
@@ -1021,7 +1011,7 @@ class CompiledStateGraph(
             self.nodes[key] = PregelNode(
                 triggers=[branch_channel],
                 # read state keys and managed values
-                channels=(list(input_values) if is_single_input else input_values),
+                channels=("__root__" if is_single_input else input_channels),
                 # coerce state dict to schema class (eg. pydantic model)
                 mapper=mapper,
                 # publish to state keys

libs/langgraph/langgraph/pregel/__init__.py

@@ -60,7 +60,6 @@ from langgraph.constants import (
     NS_SEP,
     NULL_TASK_ID,
     PUSH,
-    SCHEDULED,
     TASKS,
 )
 from langgraph.errors import (
@@ -145,7 +144,7 @@ class NodeBuilder:
         "_cache_policy",
     )
 
-    _channels: list[str] | dict[str, str]
+    _channels: str | list[str]
     _triggers: list[str]
     _tags: list[str]
     _metadata: dict[str, Any]
@@ -157,7 +156,7 @@ class NodeBuilder:
     def __init__(
         self,
     ) -> None:
-        self._channels = {}
+        self._channels = []
         self._triggers = []
         self._tags = []
         self._metadata = {}
@@ -171,10 +170,8 @@ class NodeBuilder:
         channel: str,
     ) -> Self:
         """Subscribe to a single channel."""
-        if isinstance(self._channels, list):
-            self._channels.append(channel)
-        elif not self._channels:
-            self._channels = [channel]
+        if not self._channels:
+            self._channels = channel
         else:
             raise ValueError(
                 "Cannot subscribe to single channels when other channels are already subscribed to"
@@ -200,15 +197,15 @@ class NodeBuilder:
         Returns:
             Self for chaining
         """
-        if isinstance(self._channels, list):
+        if isinstance(self._channels, str):
             raise ValueError(
                 "Cannot subscribe to channels when subscribed to a single channel"
             )
         if read:
             if not self._channels:
-                self._channels = {chan: chan for chan in channels}
+                self._channels = list(channels)
             else:
-                self._channels.update({chan: chan for chan in channels})
+                self._channels.extend(channels)
 
         if isinstance(channels, str):
             self._triggers.append(channels)
@@ -222,11 +219,10 @@ class NodeBuilder:
         *channels: str,
     ) -> Self:
         """Adds the specified channels to read from, without subscribing to them."""
-        assert self._channels, "Channels must be specified first"
-        assert isinstance(self._channels, dict), (
+        assert isinstance(self._channels, list), (
             "Cannot read additional channels when subscribed to single channels"
         )
-        self._channels.update({c: c for c in channels})
+        self._channels.extend(channels)
         return self
 
     def do(
@@ -593,8 +589,6 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
 
     config_type: type[Any] | None = None
 
-    input_model: type[BaseModel] | None = None
-
     config: RunnableConfig | None = None
 
     name: str = "LangGraph"
@@ -622,7 +616,6 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
         retry_policy: RetryPolicy | Sequence[RetryPolicy] = (),
         cache_policy: CachePolicy | None = None,
         config_type: type[Any] | None = None,
-        input_model: type[BaseModel] | None = None,
         config: RunnableConfig | None = None,
         trigger_to_nodes: Mapping[str, Sequence[str]] | None = None,
         name: str = "LangGraph",
@@ -654,7 +647,6 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
         )
         self.cache_policy = cache_policy
         self.config_type = config_type
-        self.input_model = input_model
         self.config = config
         self.trigger_to_nodes = trigger_to_nodes or {}
         self.name = name
@@ -753,6 +745,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
         validate_graph(
             self.nodes,
             {k: v for k, v in self.channels.items() if isinstance(v, BaseChannel)},
+            {k: v for k, v in self.channels.items() if not isinstance(v, BaseChannel)},
             self.input_channels,
             self.output_channels,
             self.stream_channels,
@@ -791,8 +784,6 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 return channel.UpdateType
 
     def get_input_schema(self, config: RunnableConfig | None = None) -> type[BaseModel]:
-        if self.input_model is not None:
-            return self.input_model
         config = merge_configs(self.config, config)
         if isinstance(self.input_channels, str):
             return super().get_input_schema(config)
@@ -1011,7 +1002,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
             )
         if apply_pending_writes and saved.pending_writes:
             for tid, k, v in saved.pending_writes:
-                if k in (ERROR, INTERRUPT, SCHEDULED):
+                if k in (ERROR, INTERRUPT):
                     continue
                 if tid not in next_tasks:
                     continue
@@ -1130,7 +1121,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
             )
         if apply_pending_writes and saved.pending_writes:
             for tid, k, v in saved.pending_writes:
-                if k in (ERROR, INTERRUPT, SCHEDULED):
+                if k in (ERROR, INTERRUPT):
                     continue
                 if tid not in next_tasks:
                     continue
@@ -1469,7 +1460,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                         )
                     # apply writes from tasks that already ran
                     for tid, k, v in saved.pending_writes or []:
-                        if k in (ERROR, INTERRUPT, SCHEDULED):
+                        if k in (ERROR, INTERRUPT):
                             continue
                         if tid not in next_tasks:
                             continue
@@ -1633,7 +1624,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                     )
                 # apply writes
                 for tid, k, v in saved.pending_writes:
-                    if k in (ERROR, INTERRUPT, SCHEDULED):
+                    if k in (ERROR, INTERRUPT):
                         continue
                     if tid not in next_tasks:
                         continue
@@ -1889,7 +1880,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                         )
                     # apply writes from tasks that already ran
                     for tid, k, v in saved.pending_writes or []:
-                        if k in (ERROR, INTERRUPT, SCHEDULED):
+                        if k in (ERROR, INTERRUPT):
                             continue
                         if tid not in next_tasks:
                             continue
@@ -2052,7 +2043,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                         self.trigger_to_nodes,
                     )
                 for tid, k, v in saved.pending_writes:
-                    if k in (ERROR, INTERRUPT, SCHEDULED):
+                    if k in (ERROR, INTERRUPT):
                         continue
                     if tid not in next_tasks:
                         continue
@@ -2407,7 +2398,6 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 config[CONF][CONFIG_KEY_CHECKPOINT_DURING] = checkpoint_during
             with SyncPregelLoop(
                 input,
-                input_model=self.input_model,
                 stream=StreamProtocol(stream.put, stream_modes),
                 config=config,
                 store=store,
@@ -2416,6 +2406,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 nodes=self.nodes,
                 specs=self.channels,
                 output_keys=output_keys,
+                input_keys=self.input_channels,
                 stream_keys=self.stream_channels_asis,
                 interrupt_before=interrupt_before_,
                 interrupt_after=interrupt_after_,
@@ -2470,7 +2461,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 # Channel updates from step N are only visible in step N+1
                 # channels are guaranteed to be immutable for the duration of the step,
                 # with channel updates applied only at the transition between steps.
-                while loop.tick(input_keys=self.input_channels):
+                while loop.tick():
                     for task in loop.match_cached_writes():
                         loop.output_writes(task.id, task.writes, cached=True)
                     for _ in runner.tick(
@@ -2481,6 +2472,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                     ):
                         # emit output
                         yield from output()
+                    loop.after_tick()
             # emit output
             yield from output()
             # handle exit
@@ -2650,7 +2642,6 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 config[CONF][CONFIG_KEY_CHECKPOINT_DURING] = checkpoint_during
             async with AsyncPregelLoop(
                 input,
-                input_model=self.input_model,
                 stream=StreamProtocol(stream.put_nowait, stream_modes),
                 config=config,
                 store=store,
@@ -2659,6 +2650,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 nodes=self.nodes,
                 specs=self.channels,
                 output_keys=output_keys,
+                input_keys=self.input_channels,
                 stream_keys=self.stream_channels_asis,
                 interrupt_before=interrupt_before_,
                 interrupt_after=interrupt_after_,
@@ -2704,7 +2696,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                 # channel updates from step N are only visible in step N+1
                 # channels are guaranteed to be immutable for the duration of the step,
                 # with channel updates applied only at the transition between steps
-                while loop.tick(input_keys=self.input_channels):
+                while loop.tick():
                     for task in await loop.amatch_cached_writes():
                         loop.output_writes(task.id, task.writes, cached=True)
                     async for _ in runner.atick(
@@ -2716,6 +2708,7 @@ class Pregel(PregelProtocol[StateT, InputT, OutputT], Generic[StateT, InputT, Ou
                         # emit output
                         for o in output():
                             yield o
+                    loop.after_tick()
             # emit output
             for o in output():
                 yield o

libs/langgraph/langgraph/pregel/algo.py

@@ -922,18 +922,18 @@ def _triggers(
     seen: ChannelVersions | None,
     null_version: V,
     proc: PregelNode,
-) -> Sequence[str]:
+) -> bool:
     if seen is None:
         for chan in proc.triggers:
             if channels[chan].is_available():
-                return (chan,)
+                return True
     else:
         for chan in proc.triggers:
             if channels[chan].is_available() and versions.get(  # type: ignore[operator]
                 chan, null_version
             ) > seen.get(chan, null_version):
-                return (chan,)
-    return EMPTY_SEQ
+                return True
+    return False
 
 
 def _scratchpad(
@@ -1019,23 +1019,20 @@ def _proc_input(
         return copy(input_cache[proc.input_cache_key])
     # If all trigger channels subscribed by this process are not empty
     # then invoke the process with the values of all non-empty channels
-    if isinstance(proc.channels, dict):
+    if isinstance(proc.channels, list):
         val: dict[str, Any] = {}
-        for k, chan in proc.channels.items():
-            if chan in channels:
-                if channels[chan].is_available():
-                    val[k] = channels[chan].get()
-            else:
-                val[k] = managed[k].get(scratchpad)
-    elif isinstance(proc.channels, list):
         for chan in proc.channels:
             if chan in channels:
                 if channels[chan].is_available():
-                    val = channels[chan].get()
-                    break
+                    val[chan] = channels[chan].get()
             else:
-                val = managed[chan].get(scratchpad)
-                break
+                val[chan] = managed[chan].get(scratchpad)
+    elif isinstance(proc.channels, str):
+        if proc.channels in channels:
+            if channels[proc.channels].is_available():
+                val = channels[proc.channels].get()
+            else:
+                return MISSING
         else:
             return MISSING
     else:

libs/langgraph/langgraph/pregel/loop.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 import asyncio
 import binascii
 import concurrent.futures
-import dataclasses
 from collections import defaultdict, deque
 from collections.abc import Iterator, Mapping, Sequence
 from contextlib import (
@@ -25,7 +24,6 @@ from typing import (
 
 from langchain_core.callbacks import AsyncParentRunManager, ParentRunManager
 from langchain_core.runnables import RunnableConfig
-from pydantic import BaseModel
 from typing_extensions import ParamSpec, Self
 
 from langgraph.cache.base import BaseCache
@@ -46,9 +44,6 @@ from langgraph.constants import (
     CONFIG_KEY_CHECKPOINT_ID,
     CONFIG_KEY_CHECKPOINT_MAP,
     CONFIG_KEY_CHECKPOINT_NS,
-    CONFIG_KEY_DEDUPE_TASKS,
-    CONFIG_KEY_DELEGATE,
-    CONFIG_KEY_ENSURE_LATEST,
     CONFIG_KEY_RESUME_MAP,
     CONFIG_KEY_RESUMING,
     CONFIG_KEY_SCRATCHPAD,
@@ -60,17 +55,15 @@ from langgraph.constants import (
     INPUT,
     INTERRUPT,
     MISSING,
+    NS_END,
     NS_SEP,
     NULL_TASK_ID,
     PUSH,
     RESUME,
-    SCHEDULED,
     TAG_HIDDEN,
 )
 from langgraph.errors import (
-    CheckpointNotLatest,
     EmptyInputError,
-    GraphDelegate,
     GraphInterrupt,
 )
 from langgraph.managed.base import (
@@ -132,9 +125,7 @@ from langgraph.utils.config import patch_configurable
 V = TypeVar("V")
 P = ParamSpec("P")
 
-INPUT_DONE = object()
-INPUT_RESUMING = object()
-INPUT_SHOULD_VALIDATE = object()
+
 WritesT = Sequence[tuple[str, Any]]
 
 
@@ -155,11 +146,11 @@ class PregelLoop:
     stop: int
 
     input: Any | None
-    input_model: type[BaseModel] | None
     cache: BaseCache[WritesT] | None
     checkpointer: BaseCheckpointSaver | None
     nodes: Mapping[str, PregelNode]
     specs: Mapping[str, BaseChannel | ManagedValueSpec]
+    input_keys: str | Sequence[str]
     output_keys: str | Sequence[str]
     stream_keys: str | Sequence[str]
     skip_done_tasks: bool
@@ -202,11 +193,16 @@ class PregelLoop:
     prev_checkpoint_config: RunnableConfig | None
 
     status: Literal[
-        "pending", "done", "interrupt_before", "interrupt_after", "out_of_steps"
+        "input",
+        "pending",
+        "done",
+        "interrupt_before",
+        "interrupt_after",
+        "out_of_steps",
     ]
     tasks: dict[str, PregelExecutableTask]
-    to_interrupt: list[PregelExecutableTask]
     output: None | dict[str, Any] | Any = None
+    updated_channels: set[str] | None = None
 
     # public
 
@@ -221,13 +217,13 @@ class PregelLoop:
         checkpointer: BaseCheckpointSaver | None,
         nodes: Mapping[str, PregelNode],
         specs: Mapping[str, BaseChannel | ManagedValueSpec],
+        input_keys: str | Sequence[str],
         output_keys: str | Sequence[str],
         stream_keys: str | Sequence[str],
         trigger_to_nodes: Mapping[str, Sequence[str]],
         interrupt_after: All | Sequence[str] = EMPTY_SEQ,
         interrupt_before: All | Sequence[str] = EMPTY_SEQ,
         manager: None | AsyncParentRunManager | ParentRunManager = None,
-        input_model: type[BaseModel] | None = None,
         debug: bool = False,
         migrate_checkpoint: Callable[[Checkpoint], None] | None = None,
         retry_policy: Sequence[RetryPolicy] = (),
@@ -240,21 +236,18 @@ class PregelLoop:
         self.step = 0
         self.stop = 0
         self.input = input
-        self.input_model = input_model
         self.checkpointer = checkpointer
         self.cache = cache
         self.nodes = nodes
         self.specs = specs
+        self.input_keys = input_keys
         self.output_keys = output_keys
         self.stream_keys = stream_keys
         self.interrupt_after = interrupt_after
         self.interrupt_before = interrupt_before
         self.manager = manager
         self.is_nested = CONFIG_KEY_TASK_ID in self.config.get(CONF, {})
-        self.skip_done_tasks = (
-            CONFIG_KEY_CHECKPOINT_ID not in config[CONF]
-            or CONFIG_KEY_DEDUPE_TASKS in config[CONF]
-        )
+        self.skip_done_tasks = CONFIG_KEY_CHECKPOINT_ID not in config[CONF]
         self._migrate_checkpoint = migrate_checkpoint
         self.trigger_to_nodes = trigger_to_nodes
         self.retry_policy = retry_policy
@@ -264,9 +257,7 @@ class PregelLoop:
         if self.stream is not None and CONFIG_KEY_STREAM in config[CONF]:
             self.stream = DuplexStream(self.stream, config[CONF][CONFIG_KEY_STREAM])
         scratchpad: PregelScratchpad | None = config[CONF].get(CONFIG_KEY_SCRATCHPAD)
-        if not self.config[CONF].get(CONFIG_KEY_DELEGATE) and isinstance(
-            scratchpad, PregelScratchpad
-        ):
+        if isinstance(scratchpad, PregelScratchpad):
             # if count is > 0, append to checkpoint_ns
             # if count is 0, leave as is
             if cnt := scratchpad.subgraph_counter():
@@ -404,12 +395,6 @@ class PregelLoop:
         self, task: PregelExecutableTask, write_idx: int, call: Call | None = None
     ) -> PregelExecutableTask | None:
         """Accept a PUSH from a task, potentially returning a new task to start."""
-        # don't start if we should interrupt *after* the original task
-        if self.interrupt_after and should_interrupt(
-            self.checkpoint, self.interrupt_after, [task]
-        ):
-            self.to_interrupt.append(task)
-            return
         checkpoint_id_bytes = binascii.unhexlify(self.checkpoint["id"].replace("-", ""))
         null_version = checkpoint_null_version(self.checkpoint)
         if pushed := cast(
@@ -435,12 +420,6 @@ class PregelLoop:
                 cache_policy=self.cache_policy,
             ),
         ):
-            # don't start if we should interrupt *before* the new task
-            if self.interrupt_before and should_interrupt(
-                self.checkpoint, self.interrupt_before, [pushed]
-            ):
-                self.to_interrupt.append(pushed)
-                return
             # produce debug output
             self._emit("debug", map_debug_tasks, self.step, [pushed])
             # debug flag
@@ -454,11 +433,7 @@ class PregelLoop:
             # return the new task, to be started if not run before
             return pushed
 
-    def tick(
-        self,
-        *,
-        input_keys: str | Sequence[str],
-    ) -> bool:
+    def tick(self) -> bool:
         """Execute a single iteration of the Pregel loop.
 
         Args:
@@ -467,72 +442,6 @@ class PregelLoop:
         Returns:
             True if more iterations are needed.
         """
-        if self.status != "pending":
-            raise RuntimeError("Cannot tick when status is no longer 'pending'")
-
-        updated_channels: set[str] | None = None
-
-        if self.input not in (INPUT_DONE, INPUT_RESUMING, INPUT_SHOULD_VALIDATE):
-            updated_channels = self._first(input_keys=input_keys)
-        elif self.to_interrupt:
-            # if we need to interrupt, do so
-            self.status = "interrupt_before"
-            raise GraphInterrupt()
-        elif all(task.writes for task in self.tasks.values()):
-            # finish superstep
-            writes = [w for t in self.tasks.values() for w in t.writes]
-            # debug flag
-            if self.debug:
-                print_step_writes(
-                    self.step,
-                    writes,
-                    (
-                        [self.stream_keys]
-                        if isinstance(self.stream_keys, str)
-                        else self.stream_keys
-                    ),
-                )
-            # all tasks have finished
-            updated_channels = apply_writes(
-                self.checkpoint,
-                self.channels,
-                self.tasks.values(),
-                self.checkpointer_get_next_version,
-                self.trigger_to_nodes,
-            )
-            # validate input if requested
-            if self.input is INPUT_SHOULD_VALIDATE:
-                self.input = INPUT_DONE
-                # validate
-                cast(type[BaseModel], self.input_model)(
-                    **read_channels(self.channels, self.stream_keys)
-                )
-            # produce values output
-            if not updated_channels.isdisjoint(
-                (self.output_keys,)
-                if isinstance(self.output_keys, str)
-                else self.output_keys
-            ):
-                self._emit(
-                    "values", map_output_values, self.output_keys, writes, self.channels
-                )
-            # clear pending writes
-            self.checkpoint_pending_writes.clear()
-            # "not skip_done_tasks" only applies to first tick after resuming
-            self.skip_done_tasks = True
-            # save checkpoint
-            self._put_checkpoint({"source": "loop"})
-            # after execution, check if we should interrupt
-            if self.interrupt_after and should_interrupt(
-                self.checkpoint, self.interrupt_after, self.tasks.values()
-            ):
-                self.status = "interrupt_after"
-                raise GraphInterrupt()
-
-            # unset resuming flag
-            self.config[CONF].pop(CONFIG_KEY_RESUMING, None)
-        else:
-            return False
 
         # check if iteration limit is reached
         if self.step > self.stop:
@@ -554,11 +463,10 @@ class PregelLoop:
             store=self.store,
             checkpointer=self.checkpointer,
             trigger_to_nodes=self.trigger_to_nodes,
-            updated_channels=updated_channels,
+            updated_channels=self.updated_channels,
             retry_policy=self.retry_policy,
             cache_policy=self.cache_policy,
         )
-        self.to_interrupt = []
 
         # produce debug output
         if self._checkpointer_put_after_previous is not None:
@@ -588,26 +496,10 @@ class PregelLoop:
             self.status = "done"
             return False
 
-        # check if we should delegate (used by subgraphs in distributed mode)
-        if self.config[CONF].get(CONFIG_KEY_DELEGATE):
-            assert self.input is INPUT_RESUMING
-            raise GraphDelegate(
-                {
-                    "config": patch_configurable(
-                        self.config, {CONFIG_KEY_DELEGATE: False}
-                    ),
-                    "input": None,
-                }
-            )
-
         # if there are pending writes from a previous loop, apply them
         if self.skip_done_tasks and self.checkpoint_pending_writes:
             self._match_writes(self.tasks)
 
-        # if all tasks have finished, re-tick
-        if all(task.writes for task in self.tasks.values()):
-            return self.tick(input_keys=input_keys)
-
         # before execution, check if we should interrupt
         if self.interrupt_before and should_interrupt(
             self.checkpoint, self.interrupt_before, self.tasks.values()
@@ -629,6 +521,52 @@ class PregelLoop:
 
         return True
 
+    def after_tick(self) -> None:
+        # finish superstep
+        writes = [w for t in self.tasks.values() for w in t.writes]
+        # debug flag
+        if self.debug:
+            print_step_writes(
+                self.step,
+                writes,
+                (
+                    [self.stream_keys]
+                    if isinstance(self.stream_keys, str)
+                    else self.stream_keys
+                ),
+            )
+        # all tasks have finished
+        self.updated_channels = apply_writes(
+            self.checkpoint,
+            self.channels,
+            self.tasks.values(),
+            self.checkpointer_get_next_version,
+            self.trigger_to_nodes,
+        )
+        # produce values output
+        if not self.updated_channels.isdisjoint(
+            (self.output_keys,)
+            if isinstance(self.output_keys, str)
+            else self.output_keys
+        ):
+            self._emit(
+                "values", map_output_values, self.output_keys, writes, self.channels
+            )
+        # clear pending writes
+        self.checkpoint_pending_writes.clear()
+        # "not skip_done_tasks" only applies to first tick after resuming
+        self.skip_done_tasks = True
+        # save checkpoint
+        self._put_checkpoint({"source": "loop"})
+        # after execution, check if we should interrupt
+        if self.interrupt_after and should_interrupt(
+            self.checkpoint, self.interrupt_after, self.tasks.values()
+        ):
+            self.status = "interrupt_after"
+            raise GraphInterrupt()
+        # unset resuming flag
+        self.config[CONF].pop(CONFIG_KEY_RESUMING, None)
+
     def match_cached_writes(self) -> Sequence[PregelExecutableTask]:
         raise NotImplementedError
 
@@ -642,14 +580,7 @@ class PregelLoop:
             if k in (ERROR, INTERRUPT, RESUME):
                 continue
             if task := tasks.get(tid):
-                if k == SCHEDULED:
-                    if v == max(
-                        self.checkpoint["versions_seen"].get(INTERRUPT, {}).values(),
-                        default=None,
-                    ):
-                        self.tasks[tid] = dataclasses.replace(task, scheduled=True)
-                else:
-                    task.writes.append((k, v))
+                task.writes.append((k, v))
 
     def _first(self, *, input_keys: str | Sequence[str]) -> set[str] | None:
         # resuming from previous checkpoint requires
@@ -715,21 +646,8 @@ class PregelLoop:
             self._emit(
                 "values", map_output_values, self.output_keys, True, self.channels
             )
-            # set flag
-            self.input = INPUT_RESUMING
         # map inputs to channel updates
         elif input_writes := deque(map_input(input_keys, self.input)):
-            # TODO shouldn't these writes be passed to put_writes too?
-            # check if we should delegate (used by subgraphs in distributed mode)
-            if self.config[CONF].get(CONFIG_KEY_DELEGATE):
-                raise GraphDelegate(
-                    {
-                        "config": patch_configurable(
-                            self.config, {CONFIG_KEY_DELEGATE: False}
-                        ),
-                        "input": self.input,
-                    }
-                )
             # discard any unfinished tasks from previous checkpoint
             discard_tasks = prepare_next_tasks(
                 self.checkpoint,
@@ -758,24 +676,15 @@ class PregelLoop:
             )
             # save input checkpoint
             self._put_checkpoint({"source": "input"})
-            # set flag
-            if (
-                self.input_model is not None
-                and not isinstance(self.input, self.input_model)
-                and not isinstance(self.stream_keys, str)
-            ):
-                self.input = INPUT_SHOULD_VALIDATE
-            else:
-                self.input = INPUT_DONE
         elif CONFIG_KEY_RESUMING not in configurable:
             raise EmptyInputError(f"Received no input for {input_keys}")
-        else:
-            self.input = INPUT_DONE
         # update config
         if not self.is_nested:
             self.config = patch_configurable(
                 self.config, {CONFIG_KEY_RESUMING: is_resuming}
             )
+        # set flag
+        self.status = "pending"
         return updated_channels
 
     def _put_checkpoint(self, metadata: CheckpointMetadata) -> None:
@@ -868,7 +777,14 @@ class PregelLoop:
         traceback: TracebackType | None,
     ) -> bool | None:
         # persist current checkpoint and writes
-        if not self.checkpoint_during:
+        if not self.checkpoint_during and (
+            # if it's a top graph
+            not self.is_nested
+            # or a nested graph with error or interrupt
+            or exc_value is not None
+            # or a nested graph with checkpointer=True
+            or all(NS_END not in part for part in self.checkpoint_ns)
+        ):
             self._put_checkpoint(self.checkpoint_metadata)
             self._put_pending_writes()
         # suppress interrupt
@@ -992,9 +908,9 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
         manager: None | AsyncParentRunManager | ParentRunManager = None,
         interrupt_after: All | Sequence[str] = EMPTY_SEQ,
         interrupt_before: All | Sequence[str] = EMPTY_SEQ,
+        input_keys: str | Sequence[str] = EMPTY_SEQ,
         output_keys: str | Sequence[str] = EMPTY_SEQ,
         stream_keys: str | Sequence[str] = EMPTY_SEQ,
-        input_model: type[BaseModel] | None = None,
         debug: bool = False,
         migrate_checkpoint: Callable[[Checkpoint], None] | None = None,
         retry_policy: Sequence[RetryPolicy] = (),
@@ -1003,7 +919,6 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
     ) -> None:
         super().__init__(
             input,
-            input_model=input_model,
             stream=stream,
             config=config,
             checkpointer=checkpointer,
@@ -1011,6 +926,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
             store=store,
             nodes=nodes,
             specs=specs,
+            input_keys=input_keys,
             output_keys=output_keys,
             stream_keys=stream_keys,
             interrupt_after=interrupt_after,
@@ -1097,25 +1013,7 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
     # context manager
 
     def __enter__(self) -> Self:
-        if self.config.get(CONF, {}).get(
-            CONFIG_KEY_ENSURE_LATEST
-        ) and self.checkpoint_config[CONF].get(CONFIG_KEY_CHECKPOINT_ID):
-            if self.checkpointer is None:
-                raise RuntimeError(
-                    "Cannot ensure latest checkpoint without checkpointer"
-                )
-            saved = self.checkpointer.get_tuple(
-                patch_configurable(
-                    self.checkpoint_config, {CONFIG_KEY_CHECKPOINT_ID: None}
-                )
-            )
-            if (
-                saved is None
-                or saved.checkpoint["id"]
-                != self.checkpoint_config[CONF][CONFIG_KEY_CHECKPOINT_ID]
-            ):
-                raise CheckpointNotLatest
-        elif self.checkpointer:
+        if self.checkpointer:
             saved = self.checkpointer.get_tuple(self.checkpoint_config)
         else:
             saved = None
@@ -1149,10 +1047,11 @@ class SyncPregelLoop(PregelLoop, AbstractContextManager):
             self.specs, self.checkpoint
         )
         self.stack.push(self._suppress_interrupt)
-        self.status = "pending"
+        self.status = "input"
         self.step = self.checkpoint_metadata["step"] + 1
         self.stop = self.step + self.config["recursion_limit"] + 1
         self.checkpoint_previous_versions = self.checkpoint["channel_versions"].copy()
+        self.updated_channels = self._first(input_keys=self.input_keys)
 
         return self
 
@@ -1182,9 +1081,9 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
         interrupt_after: All | Sequence[str] = EMPTY_SEQ,
         interrupt_before: All | Sequence[str] = EMPTY_SEQ,
         manager: None | AsyncParentRunManager | ParentRunManager = None,
+        input_keys: str | Sequence[str] = EMPTY_SEQ,
         output_keys: str | Sequence[str] = EMPTY_SEQ,
         stream_keys: str | Sequence[str] = EMPTY_SEQ,
-        input_model: type[BaseModel] | None = None,
         debug: bool = False,
         migrate_checkpoint: Callable[[Checkpoint], None] | None = None,
         retry_policy: Sequence[RetryPolicy] = (),
@@ -1193,7 +1092,6 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
     ) -> None:
         super().__init__(
             input,
-            input_model=input_model,
             stream=stream,
             config=config,
             checkpointer=checkpointer,
@@ -1201,6 +1099,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
             store=store,
             nodes=nodes,
             specs=specs,
+            input_keys=input_keys,
             output_keys=output_keys,
             stream_keys=stream_keys,
             interrupt_after=interrupt_after,
@@ -1290,25 +1189,7 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
     # context manager
 
     async def __aenter__(self) -> Self:
-        if self.config.get(CONF, {}).get(
-            CONFIG_KEY_ENSURE_LATEST
-        ) and self.checkpoint_config[CONF].get(CONFIG_KEY_CHECKPOINT_ID):
-            if self.checkpointer is None:
-                raise RuntimeError(
-                    "Cannot ensure latest checkpoint without checkpointer"
-                )
-            saved = await self.checkpointer.aget_tuple(
-                patch_configurable(
-                    self.checkpoint_config, {CONFIG_KEY_CHECKPOINT_ID: None}
-                )
-            )
-            if (
-                saved is None
-                or saved.checkpoint["id"]
-                != self.checkpoint_config[CONF][CONFIG_KEY_CHECKPOINT_ID]
-            ):
-                raise CheckpointNotLatest
-        elif self.checkpointer:
+        if self.checkpointer:
             saved = await self.checkpointer.aget_tuple(self.checkpoint_config)
         else:
             saved = None
@@ -1344,11 +1225,11 @@ class AsyncPregelLoop(PregelLoop, AbstractAsyncContextManager):
             self.specs, self.checkpoint
         )
         self.stack.push(self._suppress_interrupt)
-        self.status = "pending"
+        self.status = "input"
         self.step = self.checkpoint_metadata["step"] + 1
         self.stop = self.step + self.config["recursion_limit"] + 1
-
         self.checkpoint_previous_versions = self.checkpoint["channel_versions"].copy()
+        self.updated_channels = self._first(input_keys=self.input_keys)
 
         return self
 

libs/langgraph/langgraph/pregel/read.py

@@ -12,12 +12,11 @@ from langchain_core.runnables import Runnable, RunnableConfig
 
 from langgraph.constants import CONF, CONFIG_KEY_READ
 from langgraph.pregel.protocol import PregelProtocol
-from langgraph.pregel.retry import RetryPolicy
 from langgraph.pregel.utils import find_subgraph_pregel
 from langgraph.pregel.write import ChannelWrite
-from langgraph.types import CachePolicy
+from langgraph.types import CachePolicy, RetryPolicy
 from langgraph.utils.config import merge_configs
-from langgraph.utils.runnable import RunnableCallable, RunnableSeq, coerce_to_runnable
+from langgraph.utils.runnable import RunnableCallable, RunnableSeq
 
 READ_TYPE = Callable[[Union[str, Sequence[str]], bool], Union[Any, dict[str, Any]]]
 INPUT_CACHE_KEY_TYPE = tuple[Callable[..., Any], tuple[str, ...]]
@@ -96,16 +95,15 @@ class ChannelRead(RunnableCallable):
 DEFAULT_BOUND = RunnableCallable(lambda input: input)
 
 
-class PregelNode(Runnable):
+class PregelNode:
     """A node in a Pregel graph. This won't be invoked as a runnable by the graph
     itself, but instead acts as a container for the components necessary to make
     a PregelExecutableTask for a node."""
 
-    channels: list[str] | Mapping[str, str]
+    channels: str | list[str]
     """The channels that will be passed as input to `bound`.
-    If a list, the node will be invoked with the first of that isn't empty.
-    If a dict, the keys are the names of the channels, and the values are the keys
-    to use in the input to `bound`."""
+    If a str, the node will be invoked with its value if it isn't empty.
+    If a list, the node will be invoked with a dict of those channels' values."""
 
     triggers: list[str]
     """If any of these channels is written to, this node will be triggered in
@@ -140,7 +138,7 @@ class PregelNode(Runnable):
     def __init__(
         self,
         *,
-        channels: list[str] | Mapping[str, str],
+        channels: str | list[str],
         triggers: Sequence[str],
         mapper: Callable[[Any], Any] | None = None,
         writers: list[Runnable] | None = None,
@@ -223,59 +221,11 @@ class PregelNode(Runnable):
         This is used to avoid calculating the same input multiple times."""
         return (
             self.mapper,
-            tuple(f"{key}:{value}" for key, value in self.channels.items())
-            if isinstance(self.channels, dict)
-            else tuple(self.channels),
+            tuple(self.channels)
+            if isinstance(self.channels, list)
+            else (self.channels,),
         )
 
-    def join(self, channels: Sequence[str]) -> PregelNode:
-        assert isinstance(channels, list) or isinstance(channels, tuple), (
-            "channels must be a list or tuple"
-        )
-        assert isinstance(self.channels, dict), (
-            "all channels must be named when using .join()"
-        )
-        return self.copy(
-            update=dict(
-                channels={
-                    **self.channels,
-                    **{chan: chan for chan in channels},
-                }
-            ),
-        )
-
-    def __or__(
-        self,
-        other: Runnable[Any, Any]
-        | Callable[[Any], Any]
-        | Mapping[str, Runnable[Any, Any] | Callable[[Any], Any]],
-    ) -> PregelNode:
-        if isinstance(other, Runnable) and ChannelWrite.is_writer(other):
-            return self.copy(update=dict(writers=[*self.writers, other]))
-        elif self.bound is DEFAULT_BOUND:
-            return self.copy(
-                update=dict(bound=coerce_to_runnable(other, name=None, trace=True))
-            )
-        else:
-            return self.copy(update=dict(bound=RunnableSeq(self.bound, other)))
-
-    def pipe(
-        self,
-        *others: Runnable[Any, Any] | Callable[[Any], Any],
-        name: str | None = None,
-    ) -> PregelNode:
-        for other in others:
-            self = self | other
-        return self
-
-    def __ror__(
-        self,
-        other: Runnable[Any, Any]
-        | Callable[[Any], Any]
-        | Mapping[str, Runnable[Any, Any] | Callable[[Any], Any]],
-    ) -> PregelNode:
-        raise NotImplementedError()
-
     def invoke(
         self,
         input: Any,

libs/langgraph/langgraph/pregel/validate.py

@@ -5,6 +5,7 @@ from typing import Any
 
 from langgraph.channels.base import BaseChannel
 from langgraph.constants import RESERVED
+from langgraph.managed.base import ManagedValueMapping
 from langgraph.pregel.read import PregelNode
 from langgraph.types import All
 
@@ -12,6 +13,7 @@ from langgraph.types import All
 def validate_graph(
     nodes: Mapping[str, PregelNode],
     channels: dict[str, BaseChannel],
+    managed: ManagedValueMapping,
     input_channels: str | Sequence[str],
     output_channels: str | Sequence[str],
     stream_channels: str | Sequence[str] | None,
@@ -20,14 +22,30 @@ def validate_graph(
 ) -> None:
     for chan in channels:
         if chan in RESERVED:
-            raise ValueError(f"Channel names {chan} are reserved")
+            raise ValueError(f"Channel name '{chan}' is reserved")
+    for name in managed:
+        if name in RESERVED:
+            raise ValueError(f"Managed name '{name}' is reserved")
 
     subscribed_channels = set[str]()
     for name, node in nodes.items():
         if name in RESERVED:
-            raise ValueError(f"Node names {RESERVED} are reserved")
+            raise ValueError(f"Node name '{name}' is reserved")
         if isinstance(node, PregelNode):
             subscribed_channels.update(node.triggers)
+            if isinstance(node.channels, str):
+                if node.channels not in channels:
+                    raise ValueError(
+                        f"Node {name} reads channel '{node.channels}' "
+                        f"not in known channels: '{repr(sorted(channels))[:100]}'"
+                    )
+            else:
+                for chan in node.channels:
+                    if chan not in channels and chan not in managed:
+                        raise ValueError(
+                            f"Node {name} reads channel '{chan}' "
+                            f"not in known channels: '{repr(sorted(channels))[:100]}'"
+                        )
         else:
             raise TypeError(
                 f"Invalid node type {type(node)}, expected PregelNode or NodeBuilder"

libs/langgraph/langgraph/types.py

@@ -203,7 +203,6 @@ class PregelExecutableTask:
     cache_key: CacheKey | None
     id: str
     path: tuple[str | int | tuple, ...]
-    scheduled: bool = False
     writers: Sequence[Runnable] = ()
     subgraphs: Sequence[PregelProtocol] = ()
 

libs/langgraph/tests/test_large_cases.py

@@ -4213,44 +4213,6 @@ def test_doubly_nested_graph_state(
     # get child graph history
     child_history = list(app.get_state_history(outer_history[1].tasks[0].state))
     assert child_history == [
-        StateSnapshot(
-            values={"my_key": "hi my value here and there"},
-            next=(),
-            config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr("child:"),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {"": AnyStr(), AnyStr("child:"): AnyStr()}
-                    ),
-                }
-            },
-            metadata={
-                "source": "loop",
-                "step": 1,
-                "parents": {"": AnyStr()},
-                "thread_id": "1",
-                "langgraph_node": "child",
-                "langgraph_path": [PULL, AnyStr("child")],
-                "langgraph_step": 2,
-                "langgraph_triggers": ["branch:to:child"],
-                "langgraph_checkpoint_ns": AnyStr("child:"),
-            },
-            created_at=AnyStr(),
-            parent_config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr("child:"),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {"": AnyStr(), AnyStr("child:"): AnyStr()}
-                    ),
-                }
-            },
-            tasks=(),
-            interrupts=(),
-        ),
         StateSnapshot(
             values={"my_key": "hi my value"},
             next=("child_1",),
@@ -4295,62 +4257,8 @@ def test_doubly_nested_graph_state(
         ),
     ]
     # get grandchild graph history
-    grandchild_history = list(app.get_state_history(child_history[1].tasks[0].state))
+    grandchild_history = list(app.get_state_history(child_history[0].tasks[0].state))
     assert grandchild_history == [
-        StateSnapshot(
-            values={"my_key": "hi my value here and there"},
-            next=(),
-            config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr(),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {
-                            "": AnyStr(),
-                            AnyStr("child:"): AnyStr(),
-                            AnyStr(re.compile(r"child:.+|child1:")): AnyStr(),
-                        }
-                    ),
-                }
-            },
-            metadata={
-                "source": "loop",
-                "step": 2,
-                "parents": AnyDict(
-                    {
-                        "": AnyStr(),
-                        AnyStr("child:"): AnyStr(),
-                    }
-                ),
-                "thread_id": "1",
-                "langgraph_checkpoint_ns": AnyStr("child:"),
-                "langgraph_node": "child_1",
-                "langgraph_path": [
-                    PULL,
-                    AnyStr("child_1"),
-                ],
-                "langgraph_step": 1,
-                "langgraph_triggers": ["branch:to:child_1"],
-            },
-            created_at=AnyStr(),
-            parent_config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr(),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {
-                            "": AnyStr(),
-                            AnyStr("child:"): AnyStr(),
-                            AnyStr(re.compile(r"child:.+|child1:")): AnyStr(),
-                        }
-                    ),
-                }
-            },
-            tasks=(),
-            interrupts=(),
-        ),
         StateSnapshot(
             values={"my_key": "hi my value here"},
             next=("grandchild_2",),
@@ -4418,7 +4326,7 @@ def test_send_to_nested_graphs(sync_checkpointer: BaseCheckpointSaver) -> None:
         return {"subject": f"{subject} - hohoho"}
 
     # subgraph
-    subgraph = StateGraph(JokeState, output=OverallState)
+    subgraph = StateGraph(JokeState, output_schema=OverallState)
     subgraph.add_node("edit", edit)
     subgraph.add_node(
         "generate", lambda state: {"jokes": [f"Joke about {state['subject']}"]}

libs/langgraph/tests/test_large_cases_async.py

@@ -3028,44 +3028,6 @@ async def test_doubly_nested_graph_state(
         c async for c in app.aget_state_history(outer_history[1].tasks[0].state)
     ]
     assert child_history == [
-        StateSnapshot(
-            values={"my_key": "hi my value here and there"},
-            next=(),
-            config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr("child:"),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {"": AnyStr(), AnyStr("child:"): AnyStr()}
-                    ),
-                }
-            },
-            metadata={
-                "source": "loop",
-                "step": 1,
-                "parents": {"": AnyStr()},
-                "thread_id": "1",
-                "langgraph_node": "child",
-                "langgraph_path": [PULL, AnyStr("child")],
-                "langgraph_step": 2,
-                "langgraph_triggers": ["branch:to:child"],
-                "langgraph_checkpoint_ns": AnyStr("child:"),
-            },
-            created_at=AnyStr(),
-            parent_config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr("child:"),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {"": AnyStr(), AnyStr("child:"): AnyStr()}
-                    ),
-                }
-            },
-            tasks=(),
-            interrupts=(),
-        ),
         StateSnapshot(
             values={"my_key": "hi my value"},
             next=("child_1",),
@@ -3111,65 +3073,9 @@ async def test_doubly_nested_graph_state(
     ]
     # get grandchild graph history
     grandchild_history = [
-        c async for c in app.aget_state_history(child_history[1].tasks[0].state)
+        c async for c in app.aget_state_history(child_history[0].tasks[0].state)
     ]
     assert grandchild_history == [
-        StateSnapshot(
-            values={"my_key": "hi my value here and there"},
-            next=(),
-            config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr(),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {
-                            "": AnyStr(),
-                            AnyStr("child:"): AnyStr(),
-                            AnyStr(re.compile(r"child:.+|child1:")): AnyStr(),
-                        }
-                    ),
-                }
-            },
-            metadata={
-                "source": "loop",
-                "step": 2,
-                "parents": AnyDict(
-                    {
-                        "": AnyStr(),
-                        AnyStr("child:"): AnyStr(),
-                    }
-                ),
-                "thread_id": "1",
-                "langgraph_checkpoint_ns": AnyStr("child:"),
-                "langgraph_node": "child_1",
-                "langgraph_path": [
-                    PULL,
-                    AnyStr("child_1"),
-                ],
-                "langgraph_step": 1,
-                "langgraph_triggers": [
-                    "branch:to:child_1",
-                ],
-            },
-            created_at=AnyStr(),
-            parent_config={
-                "configurable": {
-                    "thread_id": "1",
-                    "checkpoint_ns": AnyStr(),
-                    "checkpoint_id": AnyStr(),
-                    "checkpoint_map": AnyDict(
-                        {
-                            "": AnyStr(),
-                            AnyStr("child:"): AnyStr(),
-                            AnyStr(re.compile(r"child:.+|child1:")): AnyStr(),
-                        }
-                    ),
-                }
-            },
-            tasks=(),
-            interrupts=(),
-        ),
         StateSnapshot(
             values={"my_key": "hi my value here"},
             next=("grandchild_2",),
@@ -3239,7 +3145,7 @@ async def test_send_to_nested_graphs(async_checkpointer: BaseCheckpointSaver) ->
         return {"subject": f"{subject} - hohoho"}
 
     # subgraph
-    subgraph = StateGraph(JokeState, output=OverallState)
+    subgraph = StateGraph(JokeState, output_schema=OverallState)
     subgraph.add_node("edit", edit)
     subgraph.add_node(
         "generate", lambda state: {"jokes": [f"Joke about {state['subject']}"]}

libs/langgraph/tests/test_pregel.py

@@ -3276,6 +3276,57 @@ def test_subgraph_checkpoint_true(
         ),
     ]
 
+    checkpoints = list(app.get_state_history(config))
+    if checkpoint_during:
+        assert len(checkpoints) == 4
+    else:
+        assert len(checkpoints) == 1
+
+
+def test_subgraph_checkpoint_during_false_inherited() -> None:
+    sync_checkpointer = InMemorySaver()
+
+    class InnerState(TypedDict):
+        my_key: Annotated[str, operator.add]
+        my_other_key: str
+
+    def inner_1(state: InnerState):
+        return {"my_key": " got here", "my_other_key": state["my_key"]}
+
+    def inner_2(state: InnerState):
+        return {"my_key": " and there"}
+
+    inner = StateGraph(InnerState)
+    inner.add_node("inner_1", inner_1)
+    inner.add_node("inner_2", inner_2)
+    inner.add_edge("inner_1", "inner_2")
+    inner.set_entry_point("inner_1")
+    inner.set_finish_point("inner_2")
+
+    class State(TypedDict):
+        my_key: str
+
+    inner_app = inner.compile(checkpointer=sync_checkpointer)
+    graph = StateGraph(State)
+    graph.add_node("inner", inner_app)
+    graph.add_edge(START, "inner")
+    graph.add_conditional_edges(
+        "inner", lambda s: "inner" if s["my_key"].count("there") < 2 else END
+    )
+    app = graph.compile(checkpointer=sync_checkpointer)
+    for checkpoint_during in [True, False]:
+        thread_id = str(uuid.uuid4())
+        config = {"configurable": {"thread_id": thread_id}}
+        app.invoke(
+            {"my_key": ""}, config, subgraphs=True, checkpoint_during=checkpoint_during
+        )
+        if checkpoint_during:
+            checkpoints = list(sync_checkpointer.list(config))
+            assert len(checkpoints) == 12
+        else:
+            checkpoints = list(sync_checkpointer.list(config))
+            assert len(checkpoints) == 1
+
 
 def test_subgraph_checkpoint_true_interrupt(
     sync_checkpointer: BaseCheckpointSaver, checkpoint_during: bool
@@ -4300,7 +4351,7 @@ def test_store_injected(
     builder = StateGraph(State)
     builder.add_node("node", Node())
     builder.add_edge("__start__", "node")
-    N = 500
+    N = 50
     M = 1
 
     for i in range(N):
@@ -4575,11 +4626,14 @@ def test_debug_nested_subgraphs(
 
         return clean_config
 
-    for checkpoint_events, checkpoint_history in zip(
-        stream_ns.values(), history_ns.values()
+    for checkpoint_events, checkpoint_history, ns in zip(
+        stream_ns.values(), history_ns.values(), stream_ns.keys()
     ):
         if not checkpoint_during:
             checkpoint_events = checkpoint_events[-1:]
+            if ns:  # Save no checkpoints for subgraphs when checkpoint_during=False
+                assert not checkpoint_history
+                continue
         assert len(checkpoint_events) == len(checkpoint_history)
         for stream, history in zip(checkpoint_events, checkpoint_history):
             assert stream["values"] == history.values

libs/langgraph/tests/test_pregel_async.py

@@ -1338,7 +1338,7 @@ async def test_node_schemas_custom_output() -> None:
             "now": 123,
         }
 
-    builder = StateGraph(State, output=Output)
+    builder = StateGraph(State, output_schema=Output)
     builder.add_node("a", node_a)
     builder.add_node("b", node_b)
     builder.add_node("c", node_c)
@@ -1353,7 +1353,7 @@ async def test_node_schemas_custom_output() -> None:
         "messages": [_AnyIdHumanMessage(content="hello")],
     }
 
-    builder = StateGraph(State, output=Output)
+    builder = StateGraph(State, output_schema=Output)
     builder.add_node("a", node_a)
     builder.add_node("b", node_b)
     builder.add_node("c", node_c)
@@ -5029,6 +5029,51 @@ async def test_subgraph_checkpoint_true(
     ]
 
 
+async def test_subgraph_checkpoint_during_false_inherited() -> None:
+    async_checkpointer = InMemorySaver()
+
+    class InnerState(TypedDict):
+        my_key: Annotated[str, operator.add]
+        my_other_key: str
+
+    def inner_1(state: InnerState):
+        return {"my_key": " got here", "my_other_key": state["my_key"]}
+
+    def inner_2(state: InnerState):
+        return {"my_key": " and there"}
+
+    inner = StateGraph(InnerState)
+    inner.add_node("inner_1", inner_1)
+    inner.add_node("inner_2", inner_2)
+    inner.add_edge("inner_1", "inner_2")
+    inner.set_entry_point("inner_1")
+    inner.set_finish_point("inner_2")
+
+    class State(TypedDict):
+        my_key: str
+
+    inner_app = inner.compile(checkpointer=async_checkpointer)
+    graph = StateGraph(State)
+    graph.add_node("inner", inner_app)
+    graph.add_edge(START, "inner")
+    graph.add_conditional_edges(
+        "inner", lambda s: "inner" if s["my_key"].count("there") < 2 else END
+    )
+    app = graph.compile(checkpointer=async_checkpointer)
+    for checkpoint_during in [True, False]:
+        thread_id = str(uuid.uuid4())
+        config = {"configurable": {"thread_id": thread_id}}
+        await app.ainvoke(
+            {"my_key": ""}, config, subgraphs=True, checkpoint_during=checkpoint_during
+        )
+        if checkpoint_during:
+            checkpoints = list(async_checkpointer.list(config))
+            assert len(checkpoints) == 12
+        else:
+            checkpoints = list(async_checkpointer.list(config))
+            assert len(checkpoints) == 1
+
+
 @NEEDS_CONTEXTVARS
 async def test_subgraph_checkpoint_true_interrupt(
     async_checkpointer: BaseCheckpointSaver, checkpoint_during: bool
@@ -5736,7 +5781,7 @@ async def test_store_injected_async(
     builder.add_edge("__start__", "node")
     builder.add_edge("node", "other_node")
 
-    N = 500
+    N = 50
     M = 1
 
     for i in range(N):
@@ -6007,11 +6052,14 @@ async def test_debug_nested_subgraphs(
 
         return clean_config
 
-    for checkpoint_events, checkpoint_history in zip(
-        stream_ns.values(), history_ns.values()
+    for checkpoint_events, checkpoint_history, ns in zip(
+        stream_ns.values(), history_ns.values(), stream_ns.keys()
     ):
         if not checkpoint_during:
             checkpoint_events = checkpoint_events[-1:]
+            if ns:  # Save no checkpoints for subgraphs when checkpoint_during=False
+                assert not checkpoint_history
+                continue
         assert len(checkpoint_events) == len(checkpoint_history)
         for stream, history in zip(checkpoint_events, checkpoint_history):
             assert stream["values"] == history.values
@@ -6982,14 +7030,17 @@ async def test_multiple_subgraphs(async_checkpointer: BaseCheckpointSaver) -> No
         return {"result": state["a"] + state["b"]}
 
     add_subgraph = (
-        StateGraph(State, output=Output).add_node(add).add_edge(START, "add").compile()
+        StateGraph(State, output_schema=Output)
+        .add_node(add)
+        .add_edge(START, "add")
+        .compile()
     )
 
     async def multiply(state):
         return {"result": state["a"] * state["b"]}
 
     multiply_subgraph = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(multiply)
         .add_edge(START, "multiply")
         .compile()
@@ -7002,7 +7053,7 @@ async def test_multiple_subgraphs(async_checkpointer: BaseCheckpointSaver) -> No
         return another_result
 
     parent_call_same_subgraph = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(call_same_subgraph)
         .add_edge(START, "call_same_subgraph")
         .compile(checkpointer=async_checkpointer)
@@ -7026,7 +7077,7 @@ async def test_multiple_subgraphs(async_checkpointer: BaseCheckpointSaver) -> No
         }
 
     parent_call_multiple_subgraphs = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(call_multiple_subgraphs)
         .add_edge(START, "call_multiple_subgraphs")
         .compile(checkpointer=async_checkpointer)
@@ -7104,14 +7155,17 @@ async def test_multiple_subgraphs_mixed_entrypoint(
         return {"result": state["a"] + state["b"]}
 
     add_subgraph = (
-        StateGraph(State, output=Output).add_node(add).add_edge(START, "add").compile()
+        StateGraph(State, output_schema=Output)
+        .add_node(add)
+        .add_edge(START, "add")
+        .compile()
     )
 
     async def multiply(state):
         return {"result": state["a"] * state["b"]}
 
     multiply_subgraph = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(multiply)
         .add_edge(START, "multiply")
         .compile()
@@ -7181,7 +7235,7 @@ async def test_multiple_subgraphs_mixed_state_graph(
         return {"result": another_result}
 
     parent_call_same_subgraph = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(call_same_subgraph)
         .add_edge(START, "call_same_subgraph")
         .compile(checkpointer=async_checkpointer)
@@ -7205,7 +7259,7 @@ async def test_multiple_subgraphs_mixed_state_graph(
         }
 
     parent_call_multiple_subgraphs = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(call_multiple_subgraphs)
         .add_edge(START, "call_multiple_subgraphs")
         .compile(checkpointer=async_checkpointer)

libs/langgraph/tests/test_state.py

@@ -92,7 +92,7 @@ def test_state_schema_with_type_hint():
             assert state.pop("foo") == "bar"
             return {"input_state": state}
 
-    graph = StateGraph(InputState, output=OutputState)
+    graph = StateGraph(InputState, output_schema=OutputState)
     actions = [
         complete_hint,
         miss_first_hint,

libs/prebuilt/langgraph/prebuilt/tool_node.py

@@ -850,7 +850,7 @@ def _get_store_arg(tool: BaseTool) -> Optional[str]:
             if _is_injection(type_arg, InjectedStore)
         ]
         if len(injections) > 1:
-            ValueError(
+            raise ValueError(
                 "A tool argument should not be annotated with InjectedStore more than "
                 f"once. Received arg {name} with annotations {injections}."
             )

libs/prebuilt/tests/test_react_agent.py

@@ -1089,14 +1089,17 @@ def test_react_with_subgraph_tools(
         return {"result": state["a"] + state["b"]}
 
     add_subgraph = (
-        StateGraph(State, output=Output).add_node(add).add_edge(START, "add").compile()
+        StateGraph(State, output_schema=Output)
+        .add_node(add)
+        .add_edge(START, "add")
+        .compile()
     )
 
     def multiply(state):
         return {"result": state["a"] * state["b"]}
 
     multiply_subgraph = (
-        StateGraph(State, output=Output)
+        StateGraph(State, output_schema=Output)
         .add_node(multiply)
         .add_edge(START, "multiply")
         .compile()

libs/sdk-js/src/client.ts

@@ -39,6 +39,75 @@ import { getEnvironmentVariable } from "./utils/env.js";
 import { mergeSignals } from "./utils/signals.js";
 import { BytesLineDecoder, SSEDecoder } from "./utils/sse.js";
 import { IterableReadableStream } from "./utils/stream.js";
+
+type HeaderValue = string | undefined | null;
+
+function* iterateHeaders(
+  headers: HeadersInit | Record<string, HeaderValue>,
+): IterableIterator<[string, string | null]> {
+  let iter: Iterable<(HeaderValue | HeaderValue | null[])[]>;
+  let shouldClear = false;
+
+  if (headers instanceof Headers) {
+    const entries: [string, string][] = [];
+    headers.forEach((value, name) => {
+      entries.push([name, value]);
+    });
+    iter = entries;
+  } else if (Array.isArray(headers)) {
+    iter = headers;
+  } else {
+    shouldClear = true;
+    iter = Object.entries(headers ?? {});
+  }
+
+  for (let item of iter) {
+    const name = item[0];
+    if (typeof name !== "string")
+      throw new TypeError(
+        `Expected header name to be a string, got ${typeof name}`,
+      );
+    const values = Array.isArray(item[1]) ? item[1] : [item[1]];
+    let didClear = false;
+
+    for (const value of values) {
+      if (value === undefined) continue;
+
+      // New object keys should always overwrite older headers
+      // Yield a null to clear the header in the headers object
+      // before adding the new value
+      if (shouldClear && !didClear) {
+        didClear = true;
+        yield [name, null];
+      }
+      yield [name, value];
+    }
+  }
+}
+
+function mergeHeaders(
+  ...headerObjects: (
+    | HeadersInit
+    | Record<string, HeaderValue>
+    | undefined
+    | null
+  )[]
+) {
+  const outputHeaders = new Headers();
+  for (const headers of headerObjects) {
+    if (!headers) continue;
+    for (const [name, value] of iterateHeaders(headers)) {
+      if (value === null) outputHeaders.delete(name);
+      else outputHeaders.append(name, value);
+    }
+  }
+  const headerEntries: [string, string][] = [];
+  outputHeaders.forEach((value, name) => {
+    headerEntries.push([name, value]);
+  });
+  return Object.fromEntries(headerEntries);
+}
+
 /**
  * Get the API key from the environment.
  * Precedence:
@@ -96,7 +165,7 @@ export interface ClientConfig {
   apiKey?: string;
   callerOptions?: AsyncCallerParams;
   timeoutMs?: number;
-  defaultHeaders?: Record<string, string | null | undefined>;
+  defaultHeaders?: Record<string, HeaderValue>;
   onRequest?: RequestHook;
 }
 
@@ -107,7 +176,7 @@ class BaseClient {
 
   protected apiUrl: string;
 
-  protected defaultHeaders: Record<string, string | null | undefined>;
+  protected defaultHeaders: Record<string, HeaderValue>;
 
   protected onRequest?: RequestHook;
 
@@ -147,7 +216,7 @@ class BaseClient {
     this.onRequest = config?.onRequest;
     const apiKey = getApiKey(config?.apiKey);
     if (apiKey) {
-      this.defaultHeaders["X-Api-Key"] = apiKey;
+      this.defaultHeaders["x-api-key"] = apiKey;
     }
   }
 
@@ -162,15 +231,14 @@ class BaseClient {
   ): [url: URL, init: RequestInit] {
     const mutatedOptions = {
       ...options,
-      headers: { ...this.defaultHeaders, ...options?.headers },
+      headers: mergeHeaders(this.defaultHeaders, options?.headers),
     };
 
     if (mutatedOptions.json) {
       mutatedOptions.body = JSON.stringify(mutatedOptions.json);
-      mutatedOptions.headers = {
-        ...mutatedOptions.headers,
-        "Content-Type": "application/json",
-      };
+      mutatedOptions.headers = mergeHeaders(mutatedOptions.headers, {
+        "content-type": "application/json",
+      });
       delete mutatedOptions.json;
     }
 
@@ -693,7 +761,6 @@ export class ThreadsClient<
     offset?: number;
     /**
      * Thread status to filter on.
-     * Must be one of 'idle', 'busy', 'interrupted' or 'error'.
      */
     status?: ThreadStatus;
     /**

libs/sdk-js/src/tests/fetch.test.ts

@@ -74,5 +74,128 @@ describe.each([["global"], ["mocked"]])(
         expect(unexpectedFetchMock).not.toHaveBeenCalled();
       });
     });
+
+    describe("header coalescing", () => {
+      it("should properly merge headers with conflicting name casing", async () => {
+        const client = new Client({ apiKey: "test-api-key" });
+        await (client.threads as any).fetch("/test", {
+          headers: { "X-Api-Key": "custom-value" },
+        });
+        expect(expectedFetchMock).toHaveBeenCalledWith(
+          expect.any(URL),
+          expect.objectContaining({
+            headers: expect.objectContaining({
+              "x-api-key": "custom-value",
+            }),
+          }),
+        );
+      });
+
+      it("should properly merge headers from multiple sources", async () => {
+        const client = new Client({
+          apiKey: "test-api-key",
+          defaultHeaders: {
+            "x-default": "default-value",
+            "x-override": "default-value",
+          },
+        });
+
+        await (client.threads as any).fetch("/test", {
+          headers: {
+            "x-custom": "custom-value",
+            "x-override": "custom-value",
+          },
+        });
+
+        expect(expectedFetchMock).toHaveBeenCalledWith(
+          expect.any(URL),
+          expect.objectContaining({
+            headers: expect.objectContaining({
+              "x-api-key": "test-api-key",
+              "x-default": "default-value",
+              "x-custom": "custom-value",
+              "x-override": "custom-value",
+            }),
+          }),
+        );
+
+        vi.clearAllMocks();
+
+        // Test with null/undefined values
+        await (client.threads as any).fetch("/test", {
+          headers: {
+            "x-null": null,
+            "x-undefined": undefined,
+            "x-empty": "",
+          },
+        });
+
+        expect(expectedFetchMock).toHaveBeenCalledWith(
+          expect.any(URL),
+          expect.objectContaining({
+            headers: expect.objectContaining({
+              "x-api-key": "test-api-key",
+              "x-default": "default-value",
+            }),
+          }),
+        );
+        expect(expectedFetchMock).not.toHaveBeenCalledWith(
+          expect.any(URL),
+          expect.objectContaining({
+            headers: expect.objectContaining({
+              "x-null": null,
+              "x-undefined": undefined,
+            }),
+          }),
+        );
+      });
+
+      it("should handle Headers object input", async () => {
+        const client = new Client({ apiKey: "test-api-key" });
+        const headers = new Headers();
+        headers.append("x-custom", "custom-value");
+        headers.append("x-multi", "value1");
+        headers.append("x-multi", "value2");
+
+        await (client.threads as any).fetch("/test", { headers });
+
+        expect(expectedFetchMock).toHaveBeenCalledWith(
+          expect.any(URL),
+          expect.objectContaining({
+            headers: expect.objectContaining({
+              "x-api-key": "test-api-key",
+              "x-custom": "custom-value",
+              "x-multi": "value1, value2",
+            }),
+          }),
+        );
+      });
+
+      it("should handle array of header tuples", async () => {
+        const client = new Client({
+          apiKey: "test-api-key",
+          defaultHeaders: {
+            "x-custom": "custom-value",
+          },
+        });
+        const headers = [
+          ["x-multi", "value1"],
+          ["x-multi", "value2"],
+        ];
+
+        await (client.threads as any).fetch("/test", { headers });
+
+        expect(expectedFetchMock).toHaveBeenCalledWith(
+          expect.any(URL),
+          expect.objectContaining({
+            headers: expect.objectContaining({
+              "x-api-key": "test-api-key",
+              "x-custom": "custom-value",
+              "x-multi": "value1, value2",
+            }),
+          }),
+        );
+      });
+    });
   },
 );