pydantic version

update lockfiles / deps bounds

.github/ISSUE_TEMPLATE/config.yml

@@ -10,6 +10,6 @@ contact_links:
   - name: Show and tell
     about: Show what you built with LangChain
     url: https://github.com/langchain-ai/langgraph/discussions/categories/show-and-tell
-  - name: Slack
-    url:  https://www.langchain.com/join-community
-    about: General community discussions
+  - name: LangChain Forum
+    url:  https://forum.langchain.com/
+    about: General community discussions and support

.github/dependabot.yml

@@ -1,11 +1,18 @@
-# Please see the documentation for all configuration options:
-# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
-# and
-# https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
-
 version: 2
 updates:
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
+
+  - package-ecosystem: "pip"
+    directories:
+      - "libs/checkpoint"
+      - "libs/checkpoint-postgres"
+      - "libs/checkpoint-sqlite"
+      - "libs/cli"
+      - "libs/langgraph"
+      - "libs/prebuilt"
+      - "libs/sdk-py"
+    schedule:
+      interval: "weekly"

.github/workflows/_test.yml

@@ -58,3 +58,14 @@ jobs:
           # grep will exit non-zero if the target message isn't found,
           # and `set -e` above will cause the step to fail.
           echo "$STATUS" | grep 'nothing to commit, working tree clean'
+
+      - name: Install min version of deps
+        shell: bash
+        working-directory: ${{ inputs.working-directory }}
+        run: uv sync --all-extras --resolution lowest-direct --no-sources --force-reinstall
+
+      - name: Run tests with min version of deps
+        shell: bash
+        working-directory: ${{ inputs.working-directory }}
+        run: make test
+

.github/workflows/_test_langgraph.yml

@@ -53,3 +53,11 @@ jobs:
           # grep will exit non-zero if the target message isn't found,
           # and `set -e` above will cause the step to fail.
           echo "$STATUS" | grep 'nothing to commit, working tree clean'
+
+      - name: Install min version of deps
+        shell: bash
+        run: uv sync --all-extras --resolution lowest-direct --no-sources --force-reinstall
+
+      - name: Run tests with min version of deps
+        shell: bash
+        run: make test_parallel

.github/workflows/ci.yml

@@ -22,6 +22,7 @@ jobs:
     outputs:
       python: ${{ steps.filter.outputs.python }}
       sdk-js: ${{ steps.filter.outputs.sdk-js }}
+      deps: ${{ steps.filter.outputs.deps }}
     steps:
       - uses: actions/checkout@v4
       - uses: dorny/paths-filter@v3
@@ -38,6 +39,9 @@ jobs:
               - 'libs/prebuilt/**'
             sdk-js:
               - 'libs/sdk-js/**'
+            deps:
+              - '**/pyproject.toml'
+              - '**/uv.lock'
 
   lint:
     needs: changes
@@ -55,7 +59,7 @@ jobs:
 
             "libs/prebuilt",
           ]
-    if: needs.changes.outputs.python == 'true'
+    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
     uses: ./.github/workflows/_lint.yml
     with:
       working-directory: ${{ matrix.working-directory }}
@@ -74,7 +78,7 @@ jobs:
             "libs/checkpoint-postgres",
             "libs/prebuilt",
           ]
-    if: needs.changes.outputs.python == 'true'
+    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
     uses: ./.github/workflows/_test.yml
     with:
       working-directory: ${{ matrix.working-directory }}
@@ -83,7 +87,7 @@ jobs:
   # NOTE: we're testing langgraph separately because it requires a different matrix
   test-langgraph:
     needs: changes
-    if: needs.changes.outputs.python == 'true'
+    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
     name: "cd libs/langgraph"
     uses: ./.github/workflows/_test_langgraph.yml
     secrets: inherit
@@ -140,7 +144,7 @@ jobs:
 
   integration-test:
     needs: changes
-    if: needs.changes.outputs.python == 'true'
+    if: needs.changes.outputs.python == 'true' || needs.changes.outputs.deps == 'true'
     name: CLI integration test
     uses: ./.github/workflows/_integration_test.yml
     secrets: inherit

.github/workflows/uv_lock_ugprade.yml

@@ -0,0 +1,45 @@
+name: UV Lock Upgrade
+
+on:
+  schedule:
+    # run at midnight every Sunday
+    - cron: '0 0 * * 0'
+  # allow manual triggering
+  workflow_dispatch:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  upgrade-dependencies:
+    runs-on: ubuntu-latest
+    
+    steps:
+      - uses: actions/checkout@v4
+      
+      - name: Set up uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          # use minimum supported Python version
+          python-version: "3.9"
+          enable-cache: true
+          cache-suffix: "uv-lock-upgrade"
+          
+      - name: Run uv lock --upgrade in all Python packages
+        run: make lock-upgrade
+          
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v6
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: upgrade dependencies with `uv lock --upgrade`"
+          title: "chore: upgrade dependencies with `uv lock --upgrade`"
+          body: |
+            This PR updates the dependencies in all Python packages using `uv lock --upgrade`.
+            
+            This is an automated PR created by the UV Lock Upgrade workflow.
+          branch: deps/uv-lock-upgrade
+          delete-branch: true
+          labels: |
+            dependencies

Makefile

@@ -47,6 +47,16 @@ lock:
 		fi; \
 	done
 
+# Lock all projects and upgrade dependencies
+.PHONY: lock-upgrade
+lock-upgrade:
+	@for dir in $(LIBS_DIRS); do \
+		if [ -f $$dir/Makefile ]; then \
+			echo "Running lock-upgrade in $$dir"; \
+			(cd $$dir && uv lock --upgrade); \
+		fi; \
+	done
+
 # Test all projects
 .PHONY: test
 test:

README.md

@@ -63,7 +63,7 @@ LangGraph provides low-level supporting infrastructure for *any* long-running, s
 While LangGraph can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools for building agents. To improve your LLM application development, pair LangGraph with:
 
 - [LangSmith](http://www.langchain.com/langsmith) — Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
-- [LangGraph Platform](https://langchain-ai.github.io/langgraph/concepts/#langgraph-platform) — Deploy and scale agents effortlessly with a purpose-built deployment platform for long running, stateful workflows. Discover, reuse, configure, and share agents across teams — and iterate quickly with visual prototyping in [LangGraph Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio/).
+- [LangGraph Platform](https://langchain-ai.github.io/langgraph/concepts/langgraph_platform/) — Deploy and scale agents effortlessly with a purpose-built deployment platform for long running, stateful workflows. Discover, reuse, configure, and share agents across teams — and iterate quickly with visual prototyping in [LangGraph Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio/).
 - [LangChain](https://python.langchain.com/docs/introduction/) – Provides integrations and composable components to streamline LLM application development.
 
 > [!NOTE]

docs/Makefile

@@ -22,7 +22,7 @@ build-prebuilt:
 	uv run python -m _scripts.third_party_page.create_third_party_page stats.yml docs/agents/prebuilt.md --language python
 
 build-docs: build-typedoc build-prebuilt
-	TARGET_LANGUAGE=js uv run python -m mkdocs build --clean -f mkdocs.yml --strict
+	uv run python -m mkdocs build --clean -f mkdocs.yml --strict
 
 llms-text:
 	uv run python -m _scripts.generate_llms_text docs/llms-full.txt

docs/_scripts/add_translation.py

@@ -4,11 +4,9 @@ import argparse
 
 import requests
 from langchain_anthropic import ChatAnthropic
-from textwrap import dedent
-
 
 # Load reference TypeScript snippets
-URL = "https://gist.githubusercontent.com/dqbd/b35d49e2ceec80e654fe1c5ab61ec477/raw/f4768aeedb67628190a4e06d063a938afc8e7672/snippets.md"
+URL = "https://gist.githubusercontent.com/eyurtsev/e7486731415463a9bc5b4682358859c8/raw/b5a5fda9c7e3387cfcb781f25082814d43675d50/gistfile1.txt"
 response = requests.get(URL)
 response.raise_for_status()
 reference_snippets = response.text
@@ -16,80 +14,6 @@ reference_snippets = response.text
 # Initialize model
 model = ChatAnthropic(model="claude-sonnet-4-0", max_tokens=64_000)
 
-
-FLUENT_INTERFACE_PROMPT = (
-    "CRITICAL: Always use method chaining (fluent interface) for StateGraph operations in TypeScript. "
-    "Never create separate variables for the graph builder or call methods individually. "
-    "The fluent interface provides better type safety and is the preferred pattern.\n\n"
-    "CORRECT examples with fluent interface:\n"
-    + dedent(
-        """
-        ```typescript
-        const graph = new StateGraph(MyState)
-          .addNode('node1', node1)
-          .addNode('node2', node2)
-          .addEdge(START, 'node1')
-          .addEdge('node1', 'node2')
-          .addEdge('node2', END)
-          .compile()
-        ```
-        
-        ```typescript
-        const graph = new StateGraph(MyState)
-          .addNode('chatbot', chatbot)
-          .addEdge(START, 'chatbot')
-          .addEdge('chatbot', END)
-          .compile()
-        ```
-        
-        ```typescript
-        const graph = new StateGraph(MyState)
-          .addNode('chatbot', chatbot)
-          .addEdge(START, 'chatbot')
-          .addEdge('chatbot', END)
-          .compile()
-        ```
-        """
-    )
-    + "\n"
-    + "INCORRECT examples to avoid:\n"
-    + dedent(
-        """
-        ```typescript
-        // WRONG: Creating separate builder variable
-        const graphBuilder = new StateGraph(MyState)
-        graphBuilder.addNode('node1', node1)
-        graphBuilder.addEdge(START, 'node1')
-        const graph = graphBuilder.compile()
-        ```
-        
-        ```typescript
-        // WRONG: Using Python-style method names
-        const workflow = new StateGraph(MyState)
-        workflow.add_node('node1', node1)
-        workflow.add_edge(START, 'node1')
-        const graph = workflow.compile()
-        ```
-        
-        ```typescript
-        // WRONG: Calling methods individually
-        const graphBuilder = new StateGraph(MyState)
-        graphBuilder.addNode('chatbot', chatbot)
-        graphBuilder.addEdge(START, 'chatbot')
-        graphBuilder.addEdge('chatbot', END)
-        const graph = graphBuilder.compile()
-        ```
-        """
-    )
-    + "\n"
-    + "Key rules:\n"
-    + "- Always chain methods directly on the StateGraph constructor\n"
-    + "- Use camelCase method names (addNode, addEdge, not add_node, add_edge)\n"
-    + "- Always end with .compile()\n"
-    + "- Never store the builder in a separate variable\n"
-)
-
-
 TRANSLATION_PROMPT = (
     "You are a helpful assistant that translates Python-based technical "
     "documentation written in Markdown to equivalent TypeScript-based documentation. "
@@ -108,12 +32,6 @@ TRANSLATION_PROMPT = (
     "the translation. "
     "Use the reference TypeScript snippets as guidance whenever possible to "
     "maintain alignment with existing conventions.\n\n"
-    "IMPORTANT REQUIREMENTS:\n"
-    "- Use Zod for state definition for StateGraph. Avoid using Annotation since it will be deprecated in the future.\n"
-    "- ALWAYS use fluent interface (method chaining) for StateGraph operations - this is CRITICAL\n"
-    "- Never create separate variables for graph builders\n"
-    "- Always chain methods directly on the StateGraph constructor and end with .compile()\n\n"
-    f"{FLUENT_INTERFACE_PROMPT}\n\n"
     f"Here are the reference TypeScript snippets:\n\n{reference_snippets}\n\n"
 )
 

docs/_scripts/compact.mjs

@@ -1,51 +0,0 @@
-import * as path from "node:path";
-import * as fs from "node:fs/promises";
-import * as url from "node:url";
-
-const mdPath = url.fileURLToPath(
-  new URL("./add_translation_js_ref_updated.md", import.meta.url)
-);
-
-const extractedDir = url.fileURLToPath(
-  new URL(
-    "../../../oap-langgraphjs-tools-agent/src/add_transaction_js",
-    import.meta.url
-  )
-);
-
-const files = (await fs.readdir(extractedDir, { withFileTypes: true })).sort(
-  (a, b) => {
-    const aInt = Number.parseInt(a.name.split(".")[0], 10);
-    const bInt = Number.parseInt(b.name.split(".")[0], 10);
-    return aInt - bInt;
-  }
-);
-
-let count = 0;
-
-let lines = [];
-
-for (let file of files) {
-  if (file.isDirectory() || !file.name.endsWith(".mts")) continue;
-  count += 1;
-
-  const content = await fs.readFile(path.resolve(extractedDir, file.name), {
-    encoding: "utf-8",
-  });
-
-  lines = lines.concat(
-    content
-      .split("\n")
-      .reduce((acc, line) => {
-        if (line.trimStart().startsWith("// ```")) acc.push([]);
-        acc.at(-1)?.push(line);
-        return acc;
-      }, [])
-      .map((i) => {
-        const tag = i[0].trimStart().slice("// ```".length);
-        return ["```" + tag, ...i.slice(1), "```"].join("\n");
-      })
-  );
-}
-
-await fs.writeFile(mdPath, lines.join("\n\n"));

docs/_scripts/extract.mjs

@@ -1,46 +0,0 @@
-import * as fs from "node:fs/promises";
-import * as path from "node:path";
-import * as url from "node:url";
-
-const mdPath = url.fileURLToPath(
-  new URL("./add_translation_js_ref.md", import.meta.url)
-);
-
-const extractedDir = url.fileURLToPath(
-  new URL(
-    "../../../oap-langgraphjs-tools-agent/src/add_transaction_js",
-    import.meta.url
-  )
-);
-
-await fs.mkdir(extractedDir, { recursive: true });
-
-const md = (await fs.readFile(mdPath, { encoding: "utf-8" })).split("\n");
-
-const chunks = [];
-let current = [];
-
-for (let line of md) {
-  if (line.trimStart().startsWith("```")) {
-    if (current.length > 0) {
-      chunks.push(current.join("\n"));
-      current = [];
-    } else {
-      current.push("// " + line.trimStart());
-    }
-  } else if (current.length > 0) {
-    current.push(line);
-  }
-}
-
-if (current.length > 0) {
-  chunks.push(current.join("\n"));
-}
-
-for (let i = 0; i < chunks.length; i += 1) {
-  await fs.writeFile(path.resolve(extractedDir, `${i}.mts`), chunks[i], {
-    encoding: "utf-8",
-  });
-}
-
-console.log("finished");

docs/_scripts/notebook_hooks.py

@@ -15,8 +15,8 @@ from mkdocs.structure.files import Files, File
 from mkdocs.structure.pages import Page
 
 from _scripts.generate_api_reference_links import update_markdown_with_imports
-from _scripts.link_map import JS_LINK_MAP
 from _scripts.notebook_convert import convert_notebook
+from _scripts.link_map import JS_LINK_MAP
 
 logger = logging.getLogger(__name__)
 logging.basicConfig()
@@ -111,6 +111,7 @@ REDIRECT_MAP = {
     "concepts/v0-human-in-the-loop.md": "concepts/human-in-the-loop.md",
     "how-tos/index.md": "index.md",
     "tutorials/introduction.ipynb": "concepts/why-langgraph.md",
+    "agents/deployment.md": "tutorials/langgraph-platform/local-server.md",
     # deployment redirects
     "how-tos/deploy-self-hosted.md": "cloud/deployment/self_hosted_data_plane.md",
     "concepts/self_hosted.md": "concepts/langgraph_self_hosted_data_plane.md",
@@ -306,12 +307,6 @@ def _highlight_code_blocks(markdown: str) -> str:
     return markdown
 
 
-TARGET_LANGUAGE = os.environ.get("TARGET_LANGUAGE", "python")
-
-if TARGET_LANGUAGE not in {"python", "js"}:
-    raise ValueError(f"TARGET_LANGUAGE must be 'python' or 'js', got {TARGET_LANGUAGE}")
-
-
 def _on_page_markdown_with_config(
     markdown: str,
     page: Page,
@@ -334,15 +329,16 @@ def _on_page_markdown_with_config(
     markdown = _highlight_code_blocks(markdown)
 
     # Apply conditional rendering for code blocks
-    markdown = _apply_conditional_rendering(markdown, TARGET_LANGUAGE)
-    if TARGET_LANGUAGE == "js":
+    target_language = kwargs.get("target_language", "python")
+    markdown = _apply_conditional_rendering(markdown, target_language)
+    if target_language == "js":
         markdown = _resolve_cross_references(markdown, JS_LINK_MAP)
-    elif TARGET_LANGUAGE == "python":
+    elif target_language == "python":
         # Via a dedicated plugin
         pass
     else:
         raise ValueError(
-            f"Unsupported target language: {TARGET_LANGUAGE}. "
+            f"Unsupported target language: {target_language}. "
             "Supported languages are 'python' and 'js'."
         )
 

docs/docs/agents/deployment.md

@@ -1,92 +0,0 @@
----
-search:
-  boost: 2
-tags:
-  - agent
-hide:
-  - tags
----
-
-# Deployment
-
-To deploy your LangGraph agent, create and configure a LangGraph app. This setup supports both local development and production deployments.
-
-Features: 
-
-* 🖥️ Local server for development
-* 🧩 Studio Web UI for visual debugging
-* ☁️ Cloud and 🔧 self-hosted deployment options
-* 📊 LangSmith integration for tracing and observability
-
-!!! info "Requirements" 
-
-    - ✅ You **must** have a [LangSmith account](https://www.langchain.com/langsmith). You can sign up for **free** and get started with the free tier.
-
-## Create a LangGraph app
-
-```bash
-pip install -U "langgraph-cli[inmem]"
-langgraph new path/to/your/app --template new-langgraph-project-python
-```
-
-This will create an empty LangGraph project. You can modify it by replacing the code in `src/agent/graph.py` with your agent code. For example:
-
-```python
-from langgraph.prebuilt import create_react_agent
-
-def get_weather(city: str) -> str:
-    """Get weather for a given city."""
-    return f"It's always sunny in {city}!"
-
-graph = create_react_agent(
-    model="anthropic:claude-3-7-sonnet-latest",
-    tools=[get_weather],
-    prompt="You are a helpful assistant"
-)
-```
-
-### Install dependencies
-
-In the root of your new LangGraph app, install the dependencies in `edit` mode so your local changes are used by the server:
-
-```shell
-pip install -e .
-```
-
-### Create an `.env` file
-
-You will find a `.env.example` in the root of your new LangGraph app. Create
-a `.env` file in the root of your new LangGraph app and copy the contents of the `.env.example` file into it, filling in the necessary API keys:
-
-```bash
-LANGSMITH_API_KEY=lsv2...
-ANTHROPIC_API_KEY=sk-
-```
-
-## Launch LangGraph server locally
-
-```shell
-langgraph dev
-```
-
-This will start up the LangGraph API server locally. If this runs successfully, you should see something like:
-
->    Ready!
-> 
->    - API: [http://localhost:2024](http://localhost:2024/)
->     
->    - Docs: http://localhost:2024/docs
->     
->    - LangGraph Studio Web UI: https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024
-
-See this [tutorial](https://langchain-ai.github.io/langgraph/tutorials/langgraph-platform/local-server/) to learn more about running LangGraph app locally.
-
-## LangGraph Studio Web UI
-
-LangGraph Studio Web is a specialized UI that you can connect to LangGraph API server to enable visualization, interaction, and debugging of your application locally. Test your graph in the LangGraph Studio Web UI by visiting the URL provided in the output of the `langgraph dev` command.
-
->    - LangGraph Studio Web UI: https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024
-
-## Deployment
-
-Once your LangGraph app is running locally, you can deploy it using LangGraph Platform. Refer to the [deployment options guide](../concepts/deployment_options.md) for detailed instructions on all supported deployment models.

docs/docs/agents/overview.md

@@ -8,9 +8,9 @@ hide:
   - tags
 ---
 
-# Agent development with LangGraph
+# Agent development using prebuilt components
 
-**LangGraph** provides both low-level primitives and high-level prebuilt components for building agent-based applications. This section focuses on the **prebuilt**, **reusable** components designed to help you construct agentic systems quickly and reliably—without the need to implement orchestration, memory, or human feedback handling from scratch.
+LangGraph provides both low-level primitives and high-level prebuilt components for building agent-based applications. This section focuses on the prebuilt, ready-to-use components designed to help you construct agentic systems quickly and reliably—without the need to implement orchestration, memory, or human feedback handling from scratch.
 
 ## What is an agent?
 

docs/docs/cloud/deployment/self_hosted_control_plane.md

@@ -3,7 +3,7 @@
 Before deploying, review the [conceptual guide for the Self-Hosted Control Plane](../../concepts/langgraph_self_hosted_control_plane.md) deployment option.
 
 !!! info "Important"
-    The Self-Hosted Control Plane deployment option is currently in beta stage and requires an [Enterprise](../../concepts/plans.md) plan.
+    The Self-Hosted Control Plane deployment option requires an [Enterprise](../../concepts/plans.md) plan.
 
 ## Prerequisites
 

docs/docs/cloud/deployment/self_hosted_data_plane.md

@@ -3,7 +3,7 @@
 Before deploying, review the [conceptual guide for the Self-Hosted Data Plane](../../concepts/langgraph_self_hosted_data_plane.md) deployment option.
 
 !!! info "Important"
-    The Self-Hosted Data Plane deployment option is currently in beta stage and requires an [Enterprise](../../concepts/plans.md) plan.
+    The Self-Hosted Data Plane deployment option requires an [Enterprise](../../concepts/plans.md) plan.
 
 ## Prerequisites
 
@@ -15,11 +15,15 @@ Before deploying, review the [conceptual guide for the Self-Hosted Data Plane](.
 ### Prerequisites
 1. `KEDA` is installed on your cluster.
 
-        helm repo add kedacore https://kedacore.github.io/charts 
+        helm repo add kedacore https://kedacore.github.io/charts
         helm install keda kedacore/keda --namespace keda --create-namespace
 
 1. A valid `Ingress` controller is installed on your cluster.
 1. You have slack space in your cluster for multiple deployments. `Cluster-Autoscaler` is recommended to automatically provision new nodes.
+1. You will need to enable egress to two control plane URLs. The listener polls these endpoints for deployments:
+
+        https://api.host.langchain.com
+        https://api.smith.langchain.com
 
 ### Setup
 

docs/docs/cloud/how-tos/use_stream_react.md

@@ -1,4 +1,4 @@
-How to integrate LangGraph into your React application# How to integrate LangGraph into your React application
+# How to integrate LangGraph into your React application
 
 !!! info "Prerequisites"
 
@@ -503,6 +503,74 @@ const handleSubmit = (text: string) => {
 };
 ```
 
+### Cached Thread Display
+
+Use the `initialValues` option to display cached thread data immediately while the history is being loaded from the server. This improves user experience by showing cached data instantly when navigating to existing threads.
+
+```tsx
+import { useStream } from "@langchain/langgraph-sdk/react";
+
+const CachedThreadExample = ({ threadId, cachedThreadData }) => {
+  const stream = useStream({
+    apiUrl: "http://localhost:2024",
+    assistantId: "agent",
+    threadId,
+    // Show cached data immediately while history loads
+    initialValues: cachedThreadData?.values,
+    messagesKey: "messages",
+  });
+
+  return (
+    <div>
+      {stream.messages.map((message) => (
+        <div key={message.id}>{message.content as string}</div>
+      ))}
+    </div>
+  );
+};
+```
+
+### Optimistic Thread Creation
+
+Use the `threadId` option in `submit` function to enable optimistic UI patterns where you need to know the thread ID before the thread is actually created.
+
+```tsx
+import { useState } from "react";
+import { useStream } from "@langchain/langgraph-sdk/react";
+
+const OptimisticThreadExample = () => {
+  const [threadId, setThreadId] = useState<string | null>(null);
+  const [optimisticThreadId] = useState(() => crypto.randomUUID());
+
+  const stream = useStream({
+    apiUrl: "http://localhost:2024",
+    assistantId: "agent",
+    threadId,
+    onThreadId: setThreadId, // (3) Updated after thread has been created.
+    messagesKey: "messages",
+  });
+
+  const handleSubmit = (text: string) => {
+    // (1) Perform a soft navigation to /threads/${optimisticThreadId}
+    // without waiting for thread creation.
+    window.history.pushState({}, "", `/threads/${optimisticThreadId}`);
+
+    // (2) Submit message to create thread with the predetermined ID.
+    stream.submit(
+      { messages: [{ type: "human", content: text }] },
+      { threadId: optimisticThreadId }
+    );
+  };
+
+  return (
+    <div>
+      <p>Thread ID: {threadId ?? optimisticThreadId}</p>
+      {/* Rest of component */}
+    </div>
+  );
+};
+```
+
 ### TypeScript
 
 The `useStream()` hook is friendly for apps written in TypeScript and you can specify types for the state to get better type safety and IDE support.

docs/docs/cloud/reference/cli.md

@@ -395,7 +395,7 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
 
 === "Python"
 
-    Start LangGraph API server. For local testing, requires a LangSmith API key with access to LangGraph Platform closed beta. Requires a license key for production use.
+    Start LangGraph API server. For local testing, requires a LangSmith API key with access to LangGraph Platform. Requires a license key for production use.
 
     **Usage**
 
@@ -422,7 +422,7 @@ The LangGraph CLI requires a JSON configuration file that follows this [schema](
 
 === "JS"
 
-    Start LangGraph API server. For local testing, requires a LangSmith API key with access to LangGraph Platform closed beta. Requires a license key for production use.
+    Start LangGraph API server. For local testing, requires a LangSmith API key with access to LangGraph Platform. Requires a license key for production use.
 
     **Usage**
 

docs/docs/concepts/application_structure.md

@@ -48,7 +48,7 @@ Below are examples of directory structures for Python and JavaScript application
     │   ├── utils # utilities for your graph
     │   │   ├── __init__.py
     │   │   ├── tools.py # tools for your graph
-    │   │   ├── nodes.py # node functions for you graph
+    │   │   ├── nodes.py # node functions for your graph
     │   │   └── state.py # state definition of your graph
     │   ├── __init__.py
     │   └── agent.py # code for constructing your graph
@@ -64,7 +64,7 @@ Below are examples of directory structures for Python and JavaScript application
     ├── src # all project code lies within here
     │   ├── utils # optional utilities for your graph
     │   │   ├── tools.ts # tools for your graph
-    │   │   ├── nodes.ts # node functions for you graph
+    │   │   ├── nodes.ts # node functions for your graph
     │   │   └── state.ts # state definition of your graph
     │   └── agent.ts # code for constructing your graph
     ├── package.json # package dependencies

docs/docs/concepts/deployment_options.md

@@ -18,9 +18,9 @@ There are 4 main options for deploying with the [LangGraph Platform](langgraph_p
 
 1. [Cloud SaaS](#cloud-saas)
 
-1. [Self-Hosted Data Plane<sup>(Beta)</sup>](#self-hosted-data-plane)
+1. [Self-Hosted Data Plane](#self-hosted-data-plane)
 
-1. [Self-Hosted Control Plane<sup>(Beta)</sup>](#self-hosted-control-plane)
+1. [Self-Hosted Control Plane](#self-hosted-control-plane)
 
 1. [Standalone Container](#standalone-container)
 
@@ -50,7 +50,7 @@ For more information, please see:
 ## Self-Hosted Data Plane
 
 !!! info "Important"
-    The Self-Hosted Data Plane deployment option is currently in beta stage and requires an [Enterprise](../concepts/plans.md) plan.
+    The Self-Hosted Data Plane deployment option requires an [Enterprise](../concepts/plans.md) plan.
 
 The [Self-Hosted Data Plane](./langgraph_self_hosted_data_plane.md) deployment option is a "hybrid" model for deployment where we manage the [control plane](./langgraph_control_plane.md) in our cloud and you manage the [data plane](./langgraph_data_plane.md) in your cloud. This option provides a way to securely manage your data plane infrastructure, while offloading control plane management to us.
 
@@ -66,7 +66,7 @@ For more information, please see:
 ## Self-Hosted Control Plane
 
 !!! info "Important"
-    The Self-Hosted Control Plane deployment option is currently in beta stage and requires an [Enterprise](../concepts/plans.md) plan.
+    The Self-Hosted Control Plane deployment option requires an [Enterprise](../concepts/plans.md) plan.
 
 The [Self-Hosted Control Plane](./langgraph_self_hosted_control_plane.md) deployment option is a fully self-hosted model for deployment where you manage the [control plane](./langgraph_control_plane.md) and [data plane](./langgraph_data_plane.md) in your cloud. This option gives you full control and responsibility of the control plane and data plane infrastructure.
 

docs/docs/concepts/faq.md

@@ -47,7 +47,7 @@ LangGraph is a stateful, orchestration framework that brings added control to ag
 
 No. LangGraph Platform is proprietary software.
 
-There is a free, self-hosted version of LangGraph Platform with access to basic features. The Cloud SaaS deployment option is free while in beta, but will eventually be a paid service. We will always give ample notice before charging for a service and reward our early adopters with preferential pricing. The Self-Hosted deployment options are paid services. [Contact our sales team](https://www.langchain.com/contact-sales) to learn more.
+There is a free, self-hosted version of LangGraph Platform with access to basic features. The Cloud SaaS deployment option and the Self-Hosted deployment options are paid services. [Contact our sales team](https://www.langchain.com/contact-sales) to learn more.
 
 For more information, see our [LangGraph Platform pricing page](https://www.langchain.com/pricing-langgraph-platform).
 

docs/docs/concepts/functional_api.md

@@ -18,10 +18,21 @@ The Functional API uses two key building blocks:
 
 This provides a minimal abstraction for building workflows with state management and streaming.
 
-!!! tip 
+!!! tip
+
+    For information on how to use the functional API, see [Use Functional API](../how-tos/use-functional-api.md).
+
+## Functional API vs. Graph API
+
+For users who prefer a more declarative approach, LangGraph's [Graph API](./low_level.md) allows you to define workflows using a Graph paradigm. Both APIs share the same underlying runtime, so you can use them together in the same application.
+
+Here are some key differences:
+
+- **Control flow**: The Functional API does not require thinking about graph structure. You can use standard Python constructs to define workflows. This will usually trim the amount of code you need to write.
+- **Short-term memory**: The **GraphAPI** requires declaring a [**State**](./low_level.md#state) and may require defining [**reducers**](./low_level.md#reducers) to manage updates to the graph state. `@entrypoint` and `@tasks` do not require explicit state management as their state is scoped to the function and is not shared across functions.
+- **Checkpointing**: Both APIs generate and use checkpoints. In the **Graph API** a new checkpoint is generated after every [superstep](./low_level.md). In the **Functional API**, when tasks are executed, their results are saved to an existing checkpoint associated with the given entrypoint instead of creating a new checkpoint.
+- **Visualization**: The Graph API makes it easy to visualize the workflow as a graph which can be useful for debugging, understanding the workflow, and sharing with others. The Functional API does not support visualization as the graph is dynamically generated during runtime.
 
-    For users who prefer a more declarative approach, LangGraph's [Graph API](./low_level.md) allows you to define workflows using a Graph paradigm. Both APIs share the same underlying runtime, so you can use them together in the same application.
-    Please see the [Functional API vs. Graph API](#functional-api-vs-graph-api) section for a comparison of the two paradigms.
 
 ## Example
 
@@ -532,15 +543,6 @@ While different runs of a workflow can produce different results, resuming a **s
 
 Idempotency ensures that running the same operation multiple times produces the same result. This helps prevent duplicate API calls and redundant processing if a step is rerun due to a failure. Always place API calls inside **tasks** functions for checkpointing, and design them to be idempotent in case of re-execution. Re-execution can occur if a **task** starts, but does not complete successfully. Then, if the workflow is resumed, the **task** will run again. Use idempotency keys or verify existing results to avoid duplication.
 
-## Functional API vs. Graph API
-
-The **Functional API** and the [Graph APIs (StateGraph)](./low_level.md#stategraph) provide two different paradigms to create applications with LangGraph. Here are some key differences:
-
-- **Control flow**: The Functional API does not require thinking about graph structure. You can use standard Python constructs to define workflows. This will usually trim the amount of code you need to write.
-- **Short-term memory**: The **GraphAPI** requires declaring a [**State**](./low_level.md#state) and may require defining [**reducers**](./low_level.md#reducers) to manage updates to the graph state. `@entrypoint` and `@tasks` do not require explicit state management as their state is scoped to the function and is not shared across functions.
-- **Checkpointing**: Both APIs generate and use checkpoints. In the **Graph API** a new checkpoint is generated after every [superstep](./low_level.md). In the **Functional API**, when tasks are executed, their results are saved to an existing checkpoint associated with the given entrypoint instead of creating a new checkpoint.
-- **Visualization**: The Graph API makes it easy to visualize the workflow as a graph which can be useful for debugging, understanding the workflow, and sharing with others. The Functional API does not support visualization as the graph is dynamically generated during runtime.
-
 ## Common Pitfalls
 
 ### Handling side effects

docs/docs/concepts/langgraph_self_hosted_control_plane.md

@@ -3,7 +3,7 @@
 There are two versions of the self-hosted deployment: [Self-Hosted Data Plane](./deployment_options.md#self-hosted-data-plane) and [Self-Hosted Control Plane](./deployment_options.md#self-hosted-control-plane).
 
 !!! info "Important"
-    The Self-Hosted Control Plane deployment option is currently in beta stage and requires an [Enterprise](plans.md) plan.
+    The Self-Hosted Control Plane deployment option requires an [Enterprise](plans.md) plan.
 
 ## Requirements
 

docs/docs/concepts/langgraph_self_hosted_data_plane.md

@@ -8,7 +8,7 @@ search:
 There are two versions of the self-hosted deployment: [Self-Hosted Data Plane](./deployment_options.md#self-hosted-data-plane) and [Self-Hosted Control Plane](./deployment_options.md#self-hosted-control-plane).
 
 !!! info "Important"
-    The Self-Hosted Data Plane deployment option is currently in beta stage and requires an [Enterprise](plans.md) plan.
+    The Self-Hosted Data Plane deployment option requires an [Enterprise](plans.md) plan.
 
 ## Requirements
 

docs/docs/concepts/langgraph_standalone_container.md

@@ -19,7 +19,7 @@ The Standalone Container deployment option is the least restrictive model for de
 
 !!! warning
 
-      LangGraph Platform should not be deployed in serverless environments.
+      LangGraph Platform should not be deployed in serverless environments. Scale to zero may cause task loss and scaling up will not work reliably.
 
 ## Architecture
 

docs/docs/how-tos/use-functional-api.md

@@ -1,5 +1,12 @@
 # Use the functional API
 
+The [**Functional API**](../concepts/functional_api.md) allows you to add LangGraph's key features — [persistence](../concepts/persistence.md), [memory](../how-tos/memory/add-memory.md), [human-in-the-loop](../concepts/human_in_the_loop.md), and [streaming](../concepts/streaming.md) — to your applications with minimal changes to your existing code.
+
+!!! tip
+
+    For conceptual information on the functional API, see [Functional API](../concepts/functional_api.md).
+
+
 ## Creating a simple workflow
 
 When defining an `entrypoint`, input is restricted to the first argument of the function. To pass multiple inputs, you can use a dictionary.
@@ -832,4 +839,4 @@ for chunk in workflow.stream([input_message], config, stream_mode="values"):
 
 ## Integrate with other libraries
 
-* [Add LangGraph's features to other frameworks using the functional API](./autogen-integration-functional.ipynb): Add LangGraph features like persistence, memory and streaming to other agent frameworks that do not provide them out of the box.
+* [Add LangGraph's features to other frameworks using the functional API](./autogen-integration-functional.ipynb): Add LangGraph features like persistence, memory and streaming to other agent frameworks that do not provide them out of the box.

docs/docs/tutorials/get-started/1-build-basic-chatbot.md

@@ -1,6 +1,6 @@
 # Build a basic chatbot
 
-In this tutorial, you will build a basic chatbot. This chatbot is the basis for the following series of tutorials where you will progressively add more sophisticated capabilities, and be introduced to key LangGraph concepts along the way. Let's dive in! 🌟
+In this tutorial, you will build a basic chatbot. This chatbot is the basis for the following series of tutorials where you will progressively add more sophisticated capabilities, and be introduced to key LangGraph concepts along the way. Let’s dive in! 🌟
 
 ## Prerequisites
 
@@ -13,44 +13,13 @@ tool-calling features, such as [OpenAI](https://platform.openai.com/api-keys),
 
 Install the required packages:
 
-:::python
-
 ```bash
 pip install -U langgraph langsmith
 ```
 
-:::
-
-:::js
-=== "npm"
-
-    ```bash
-    npm install @langchain/langgraph @langchain/core zod
-    ```
-
-=== "yarn"
-
-    ```bash
-    yarn add @langchain/langgraph @langchain/core zod
-    ```
-
-=== "pnpm"
-
-    ```bash
-    pnpm add @langchain/langgraph @langchain/core zod
-    ```
-
-=== "bun"
-
-    ```bash
-    bun add @langchain/langgraph @langchain/core zod
-    ```
-
-:::
-
 !!! tip
 
-    Sign up for LangSmith to quickly spot issues and improve the performance of your LangGraph projects. LangSmith lets you use trace data to debug, test, and monitor your LLM apps built with LangGraph. For more information on how to get started, see [LangSmith docs](https://docs.smith.langchain.com).
+    Sign up for LangSmith to quickly spot issues and improve the performance of your LangGraph projects. LangSmith lets you use trace data to debug, test, and monitor your LLM apps built with LangGraph. For more information on how to get started, see [LangSmith docs](https://docs.smith.langchain.com). 
 
 ## 2. Create a `StateGraph`
 
@@ -58,8 +27,6 @@ Now you can create a basic chatbot using LangGraph. This chatbot will respond di
 
 Start by creating a `StateGraph`. A `StateGraph` object defines the structure of our chatbot as a "state machine". We'll add `nodes` to represent the llm and functions our chatbot can call and `edges` to specify how the bot should transition between these functions.
 
-:::python
-
 ```python
 from typing import Annotated
 
@@ -79,41 +46,23 @@ class State(TypedDict):
 graph_builder = StateGraph(State)
 ```
 
-:::
-
-:::js
-
-```typescript
-import { StateGraph, MessagesZodState, START } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const graph = new StateGraph(State).compile();
-```
-
-:::
-
 Our graph can now handle two key tasks:
 
 1. Each `node` can receive the current `State` as input and output an update to the state.
-2. Updates to `messages` will be appended to the existing list rather than overwriting it, thanks to the prebuilt reducer function.
+2. Updates to `messages` will be appended to the existing list rather than overwriting it, thanks to the prebuilt [`add_messages`](https://langchain-ai.github.io/langgraph/reference/graphs/?h=add+messages#add_messages) function used with the `Annotated` syntax.
 
----
+------
 
 !!! tip "Concept"
 
-    When defining a graph, the first step is to define its `State`. The `State` includes the graph's schema and [reducer functions](https://langchain-ai.github.io/langgraph/concepts/low_level/#reducers) that handle state updates. In our example, `State` is a schema with one key: `messages`. The reducer function is used to append new messages to the list instead of overwriting it. Keys without a reducer annotation will overwrite previous values.
-
-    To learn more about state, reducers, and related concepts, see [LangGraph reference docs](https://langchain-ai.github.io/langgraph/reference/graphs/#langgraph.graph.message.add_messages).
+    When defining a graph, the first step is to define its `State`. The `State` includes the graph's schema and [reducer functions](https://langchain-ai.github.io/langgraph/concepts/low_level/#reducers) that handle state updates. In our example, `State` is a `TypedDict` with one key: `messages`. The [`add_messages`](https://langchain-ai.github.io/langgraph/reference/graphs/#langgraph.graph.message.add_messages) reducer function is used to append new messages to the list instead of overwriting it. Keys without a reducer annotation will overwrite previous values. To learn more about state, reducers, and related concepts, see [LangGraph reference docs](https://langchain-ai.github.io/langgraph/reference/graphs/#langgraph.graph.message.add_messages).
 
 ## 3. Add a node
 
-Next, add a "`chatbot`" node. **Nodes** represent units of work and are typically regular functions.
+Next, add a "`chatbot`" node. **Nodes** represent units of work and are typically regular Python functions.
 
 Let's first select a chat model:
 
-:::python
 {!snippets/chat_model_tabs.md!}
 
 <!---
@@ -124,26 +73,9 @@ llm = init_chat_model("anthropic:claude-3-5-sonnet-latest")
 ```
 -->
 
-:::
-
-:::js
-
-```typescript
-import { ChatOpenAI } from "@langchain/openai";
-// or import { ChatAnthropic } from "@langchain/anthropic";
-
-const llm = new ChatOpenAI({
-  model: "gpt-4o",
-  temperature: 0,
-});
-```
-
-:::
 
 We can now incorporate the chat model into a simple node:
 
-:::python
-
 ```python
 
 def chatbot(state: State):
@@ -156,132 +88,38 @@ def chatbot(state: State):
 graph_builder.add_node("chatbot", chatbot)
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="7-9"
-import { StateGraph, MessagesZodState, START } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state: z.infer<typeof State>) => {
-    return { messages: [await llm.invoke(state.messages)] };
-  })
-  .compile();
-```
-
-:::
-
 **Notice** how the `chatbot` node function takes the current `State` as input and returns a dictionary containing an updated `messages` list under the key "messages". This is the basic pattern for all LangGraph node functions.
 
-:::python
 The `add_messages` function in our `State` will append the LLM's response messages to whatever messages are already in the state.
-:::
-
-:::js
-The `addMessages` function used within `MessagesZodState` will append the LLM's response messages to whatever messages are already in the state.
-:::
 
 ## 4. Add an `entry` point
 
 Add an `entry` point to tell the graph **where to start its work** each time it is run:
 
-:::python
-
 ```python
 graph_builder.add_edge(START, "chatbot")
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="10"
-import { StateGraph, MessagesZodState, START } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state: z.infer<typeof State>) => {
-    return { messages: [await llm.invoke(state.messages)] };
-  })
-  .addEdge(START, "chatbot")
-  .compile();
-```
-
-:::
-
 ## 5. Add an `exit` point
 
 Add an `exit` point to indicate **where the graph should finish execution**. This is helpful for more complex flows, but even in a simple graph like this, adding an end node improves clarity.
 
-:::python
-
 ```python
 graph_builder.add_edge("chatbot", END)
 ```
-
-:::
-
-:::js
-
-```typescript hl_lines="11"
-import { StateGraph, MessagesZodState, START, END } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state: z.infer<typeof State>) => {
-    return { messages: [await llm.invoke(state.messages)] };
-  })
-  .addEdge(START, "chatbot")
-  .addEdge("chatbot", END)
-  .compile();
-```
-
-:::
-
 This tells the graph to terminate after running the chatbot node.
 
 ## 6. Compile the graph
 
-Before running the graph, we'll need to compile it. We can do so by calling `compile()` on the graph builder. This creates a `CompiledGraph` we can invoke on our state.
-
-:::python
+Before running the graph, we'll need to compile it. We can do so by calling `compile()`
+on the graph builder. This creates a `CompiledGraph` we can invoke on our state.
 
 ```python
 graph = graph_builder.compile()
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="12"
-import { StateGraph, MessagesZodState, START, END } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state: z.infer<typeof State>) => {
-    return { messages: [await llm.invoke(state.messages)] };
-  })
-  .addEdge(START, "chatbot")
-  .addEdge("chatbot", END)
-  .compile();
-```
-
-:::
-
 ## 7. Visualize the graph (optional)
 
-:::python
 You can visualize the graph using the `get_graph` method and one of the "draw" methods, like `draw_ascii` or `draw_png`. The `draw` methods each require additional dependencies.
 
 ```python
@@ -294,35 +132,17 @@ except Exception:
     pass
 ```
 
-:::
-
-:::js
-You can visualize the graph using the `getGraph` method and render the graph with the `drawMermaidPng` method.
-
-```typescript
-import * as fs from "node:fs/promises";
-
-const drawableGraph = await graph.getGraphAsync();
-const image = await drawableGraph.drawMermaidPng();
-const imageBuffer = new Uint8Array(await image.arrayBuffer());
-
-await fs.writeFile("basic-chatbot.png", imageBuffer);
-```
-
-:::
-
 ![basic chatbot diagram](basic-chatbot.png)
 
+
 ## 8. Run the chatbot
 
-Now run the chatbot!
+Now run the chatbot! 
 
 !!! tip
 
     You can exit the chat loop at any time by typing `quit`, `exit`, or `q`.
 
-:::python
-
 ```python
 def stream_graph_updates(user_input: str):
     for event in graph.stream({"messages": [{"role": "user", "content": user_input}]}):
@@ -345,66 +165,13 @@ while True:
         break
 ```
 
-:::
-
-:::js
-
-```typescript
-import * as readline from "node:readline/promises";
-import { StateGraph, MessagesZodState, START, END } from "@langchain/langgraph";
-import { ChatOpenAI } from "@langchain/openai";
-import { z } from "zod";
-
-const llm = new ChatOpenAI({ model: "gpt-4o-mini" });
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state: z.infer<typeof State>) => {
-    return { messages: [await llm.invoke(state.messages)] };
-  })
-  .addEdge(START, "chatbot")
-  .addEdge("chatbot", END)
-  .compile();
-
-async function generateText(content: string) {
-  const stream = await graph.stream(
-    { messages: [{ type: "human", content }] },
-    { streamMode: "values" }
-  );
-
-  for await (const event of stream) {
-    const lastMessage = event.messages.at(-1);
-    if (lastMessage?.getType() === "ai") {
-      console.log(`Assistant: ${lastMessage.text}`);
-    }
-  }
-}
-
-const prompt = readline.createInterface({
-  input: process.stdin,
-  output: process.stdout,
-});
-
-while (true) {
-  const human = await prompt.question("User: ");
-  if (["quit", "exit", "q"].includes(human.trim())) break;
-  await generateText(human || "What do you know about LangGraph?");
-}
-
-prompt.close();
-```
-
-:::
-
 ```
 Assistant: LangGraph is a library designed to help build stateful multi-agent applications using language models. It provides tools for creating workflows and state machines to coordinate multiple AI agents or language model interactions. LangGraph is built on top of LangChain, leveraging its components while adding graph-based coordination capabilities. It's particularly useful for developing more complex, stateful AI applications that go beyond simple query-response interactions.
+Goodbye!
 ```
 
 **Congratulations!** You've built your first chatbot using LangGraph. This bot can engage in basic conversation by taking user input and generating responses using an LLM. You can inspect a [LangSmith Trace](https://smith.langchain.com/public/7527e308-9502-4894-b347-f34385740d5a/r) for the call above.
 
-:::python
-
 Below is the full code for this tutorial:
 
 ```python
@@ -440,8 +207,8 @@ graph_builder.add_edge("chatbot", END)
 graph = graph_builder.compile()
 ```
 
-:::
-
 ## Next steps
 
 You may have noticed that the bot's knowledge is limited to what's in its training data. In the next part, we'll [add a web search tool](./2-add-tools.md) to expand the bot's knowledge and make it more capable.
+
+

docs/docs/tutorials/get-started/2-add-tools.md

@@ -10,64 +10,19 @@ To handle queries that your chatbot can't answer "from memory", integrate a web
 
 Before you start this tutorial, ensure you have the following:
 
-:::python
-
 - An API key for the [Tavily Search Engine](https://python.langchain.com/docs/integrations/tools/tavily_search/).
 
-:::
-
-:::js
-
-- An API key for the [Tavily Search Engine](https://js.langchain.com/docs/integrations/tools/tavily_search/).
-
-:::
-
 ## 1. Install the search engine
 
-:::python
 Install the requirements to use the [Tavily Search Engine](https://python.langchain.com/docs/integrations/tools/tavily_search/):
 
 ```bash
 pip install -U langchain-tavily
 ```
-
-:::
-
-:::js
-Install the requirements to use the [Tavily Search Engine](https://docs.tavily.com/):
-
-=== "npm"
-
-    ```bash
-    npm install @langchain/tavily
-    ```
-
-=== "yarn"
-
-    ```bash
-    yarn add @langchain/tavily
-    ```
-
-=== "pnpm"
-
-    ```bash
-    pnpm add @langchain/tavily
-    ```
-
-=== "bun"
-
-    ```bash
-    bun add @langchain/tavily
-    ```
-
-:::
-
 ## 2. Configure your environment
 
 Configure your environment with your search engine API key:
 
-:::python
-
 ```bash
 _set_env("TAVILY_API_KEY")
 ```
@@ -76,22 +31,10 @@ _set_env("TAVILY_API_KEY")
 TAVILY_API_KEY:  ········
 ```
 
-:::
-
-:::js
-
-```typescript
-process.env.TAVILY_API_KEY = "tvly-...";
-```
-
-:::
-
 ## 3. Define the tool
 
 Define the web search tool:
 
-:::python
-
 ```python
 from langchain_tavily import TavilySearch
 
@@ -100,25 +43,8 @@ tools = [tool]
 tool.invoke("What's a 'node' in LangGraph?")
 ```
 
-:::
-
-:::js
-
-```typescript
-import { TavilySearch } from "@langchain/tavily";
-
-const tool = new TavilySearch({ maxResults: 2 });
-const tools = [tool];
-
-await tool.invoke({ query: "What's a 'node' in LangGraph?" });
-```
-
-:::
-
 The results are page summaries our chat bot can use to answer questions:
 
-:::python
-
 ```
 {'query': "What's a 'node' in LangGraph?",
 'follow_up_questions': None,
@@ -137,51 +63,12 @@ The results are page summaries our chat bot can use to answer questions:
 'response_time': 1.38}
 ```
 
-:::
-
-:::js
-
-```json
-{
-  "query": "What's a 'node' in LangGraph?",
-  "follow_up_questions": null,
-  "answer": null,
-  "images": [],
-  "results": [
-    {
-      "url": "https://blog.langchain.dev/langgraph/",
-      "title": "LangGraph - LangChain Blog",
-      "content": "TL;DR: LangGraph is module built on top of LangChain to better enable creation of cyclical graphs, often needed for agent runtimes. This state is updated by nodes in the graph, which return operations to attributes of this state (in the form of a key-value store). After adding nodes, you can then add edges to create the graph. An example of this may be in the basic agent runtime, where we always want the model to be called after we call a tool. The state of this graph by default contains concepts that should be familiar to you if you've used LangChain agents: `input`, `chat_history`, `intermediate_steps` (and `agent_outcome` to represent the most recent agent outcome)",
-      "score": 0.7407191,
-      "raw_content": null
-    },
-    {
-      "url": "https://medium.com/@cplog/introduction-to-langgraph-a-beginners-guide-14f9be027141",
-      "title": "Introduction to LangGraph: A Beginner's Guide - Medium",
-      "content": "*   **Stateful Graph:** LangGraph revolves around the concept of a stateful graph, where each node in the graph represents a step in your computation, and the graph maintains a state that is passed around and updated as the computation progresses. LangGraph supports conditional edges, allowing you to dynamically determine the next node to execute based on the current state of the graph. Image 10: Introduction to AI Agent with LangChain and LangGraph: A Beginner’s Guide Image 18: How to build LLM Agent with LangGraph — StateGraph and Reducer Image 20: Simplest Graphs using LangGraph Framework Image 24: Building a ReAct Agent with Langgraph: A Step-by-Step Guide Image 28: Building an Agentic RAG with LangGraph: A Step-by-Step Guide",
-      "score": 0.65279555,
-      "raw_content": null
-    }
-  ],
-  "response_time": 1.34
-}
-```
-
-:::
-
 ## 4. Define the graph
 
-:::python
 For the `StateGraph` you created in the [first tutorial](./1-build-basic-chatbot.md), add `bind_tools` on the LLM. This lets the LLM know the correct JSON format to use if it wants to use the search engine.
-:::
-
-:::js
-For the `StateGraph` you created in the [first tutorial](./1-build-basic-chatbot.md), add `bindTools` on the LLM. This lets the LLM know the correct JSON format to use if it wants to use the search engine.
-:::
 
 Let's first select our LLM:
 
-:::python
 {!snippets/chat_model_tabs.md!}
 
 <!---
@@ -192,22 +79,8 @@ llm = init_chat_model("anthropic:claude-3-5-sonnet-latest")
 ```
 -->
 
-:::
-
-:::js
-
-```typescript
-import { ChatAnthropic } from "@langchain/anthropic";
-
-const llm = new ChatAnthropic({ model: "claude-3-5-sonnet-latest" });
-```
-
-:::
-
 We can now incorporate it into a `StateGraph`:
 
-:::python
-
 ```python hl_lines="15"
 from typing import Annotated
 
@@ -231,31 +104,9 @@ def chatbot(state: State):
 graph_builder.add_node("chatbot", chatbot)
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="7-8"
-import { StateGraph, MessagesZodState } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const chatbot = async (state: z.infer<typeof State>) => {
-  // Modification: tell the LLM which tools it can call
-  const llmWithTools = llm.bindTools(tools);
-
-  return { messages: [await llmWithTools.invoke(state.messages)] };
-};
-```
-
-:::
-
 ## 5. Create a function to run the tools
 
-:::python
-
-Now, create a function to run the tools if they are called. Do this by adding the tools to a new node called `BasicToolNode` that checks the most recent message in the state and calls tools if the message contains `tool_calls`. It relies on the LLM's `tool_calling` support, which is available in Anthropic, OpenAI, Google Gemini, and a number of other LLM providers.
+Now, create a function to run the tools if they are called. Do this by adding the tools to a new node called`BasicToolNode` that checks the most recent message in the state and calls tools if the message contains `tool_calls`. It relies on the LLM's `tool_calling` support, which is available in Anthropic, OpenAI, Google Gemini, and a number of other LLM providers.
 
 ```python
 import json
@@ -297,80 +148,16 @@ graph_builder.add_node("tools", tool_node)
 
     If you do not want to build this yourself in the future, you can use LangGraph's prebuilt [ToolNode](https://langchain-ai.github.io/langgraph/reference/agents/#langgraph.prebuilt.tool_node.ToolNode).
 
-:::
-
-:::js
-
-Now, create a function to run the tools if they are called. Do this by adding the tools to a new node called `"tools"` that checks the most recent message in the state and calls tools if the message contains `tool_calls`. It relies on the LLM's tool calling support, which is available in Anthropic, OpenAI, Google Gemini, and a number of other LLM providers.
-
-```typescript
-import type { StructuredToolInterface } from "@langchain/core/tools";
-import { isAIMessage, ToolMessage } from "@langchain/core/messages";
-
-function createToolNode(tools: StructuredToolInterface[]) {
-  const toolByName: Record<string, StructuredToolInterface> = {};
-  for (const tool of tools) {
-    toolByName[tool.name] = tool;
-  }
-
-  return async (inputs: z.infer<typeof State>) => {
-    const { messages } = inputs;
-    if (!messages || messages.length === 0) {
-      throw new Error("No message found in input");
-    }
-
-    const message = messages.at(-1);
-    if (!message || !isAIMessage(message) || !message.tool_calls) {
-      throw new Error("Last message is not an AI message with tool calls");
-    }
-
-    const outputs: ToolMessage[] = [];
-    for (const toolCall of message.tool_calls) {
-      if (!toolCall.id) throw new Error("Tool call ID is required");
-
-      const tool = toolByName[toolCall.name];
-      if (!tool) throw new Error(`Tool ${toolCall.name} not found`);
-
-      const result = await tool.invoke(toolCall.args);
-
-      outputs.push(
-        new ToolMessage({
-          content: JSON.stringify(result),
-          name: toolCall.name,
-          tool_call_id: toolCall.id,
-        })
-      );
-    }
-
-    return { messages: outputs };
-  };
-}
-```
-
-!!! note
-
-    If you do not want to build this yourself in the future, you can use LangGraph's prebuilt [ToolNode](https://langchain-ai.github.io/langgraphjs/reference/classes/langgraph_prebuilt.ToolNode.html).
-
-:::
-
 ## 6. Define the `conditional_edges`
 
-With the tool node added, now you can define the `conditional_edges`.
+With the tool node added, now you can define the `conditional_edges`. 
 
 **Edges** route the control flow from one node to the next. **Conditional edges** start from a single node and usually contain "if" statements to route to different nodes depending on the current graph state. These functions receive the current graph `state` and return a string or list of strings indicating which node(s) to call next.
 
-:::python
-Next, define a router function called `route_tools` that checks for `tool_calls` in the chatbot's output. Provide this function to the graph by calling `add_conditional_edges`, which tells the graph that whenever the `chatbot` node completes to check this function to see where to go next.
-:::
-
-:::js
-Next, define a router function called `routeTools` that checks for `tool_calls` in the chatbot's output. Provide this function to the graph by calling `addConditionalEdges`, which tells the graph that whenever the `chatbot` node completes to check this function to see where to go next.
-:::
+Next, define a router function called `route_tools` that checks for `tool_calls` in the chatbot's output. Provide this function to the graph by calling `add_conditional_edges`, which tells the graph that whenever the `chatbot` node completes to check this function to see where to go next. 
 
 The condition will route to `tools` if tool calls are present and `END` if not. Because the condition can return `END`, you do not need to explicitly set a `finish_point` this time.
 
-:::python
-
 ```python
 def route_tools(
     state: State,
@@ -410,61 +197,10 @@ graph = graph_builder.compile()
 
 !!! note
 
-    You can replace this with the prebuilt [tools_condition](https://langchain-ai.github.io/langgraph/reference/prebuilt/#tools_condition) to be more concise.
-
-:::
-
-:::js
-
-```typescript
-import { END, START } from "@langchain/langgraph";
-
-const routeTools = (state: z.infer<typeof State>) => {
-  /**
-   * Use as conditional edge to route to the ToolNode if the last message
-   * has tool calls.
-   */
-  const lastMessage = state.messages.at(-1);
-  if (
-    lastMessage &&
-    isAIMessage(lastMessage) &&
-    lastMessage.tool_calls?.length
-  ) {
-    return "tools";
-  }
-
-  /** Otherwise, route to the end. */
-  return END;
-};
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", chatbot)
-
-  // The `routeTools` function returns "tools" if the chatbot asks to use a tool, and "END" if
-  // it is fine directly responding. This conditional routing defines the main agent loop.
-  .addNode("tools", createToolNode(tools))
-
-  // Start the graph with the chatbot
-  .addEdge(START, "chatbot")
-
-  // The `routeTools` function returns "tools" if the chatbot asks to use a tool, and "END" if
-  // it is fine directly responding.
-  .addConditionalEdges("chatbot", routeTools, ["tools", END])
-
-  // Any time a tool is called, we need to return to the chatbot
-  .addEdge("tools", "chatbot")
-  .compile();
-```
-
-!!! note
-
-    You can replace this with the prebuilt [toolsCondition](https://langchain-ai.github.io/langgraphjs/reference/functions/langgraph_prebuilt.toolsCondition.html) to be more concise.
-
-:::
+    You can replace this with the prebuilt [tools_condition](https://langchain-ai.github.io/langgraph/reference/prebuilt/#tools_condition) to be more concise. 
 
 ## 7. Visualize the graph (optional)
 
-:::python
 You can visualize the graph using the `get_graph` method and one of the "draw" methods, like `draw_ascii` or `draw_png`. The `draw` methods each require additional dependencies.
 
 ```python
@@ -477,31 +213,12 @@ except Exception:
     pass
 ```
 
-:::
-
-:::js
-You can visualize the graph using the `getGraph` method and render the graph with the `drawMermaidPng` method.
-
-```typescript
-import * as fs from "node:fs/promises";
-
-const drawableGraph = await graph.getGraphAsync();
-const image = await drawableGraph.drawMermaidPng();
-const imageBuffer = new Uint8Array(await image.arrayBuffer());
-
-await fs.writeFile("chatbot-with-tools.png", imageBuffer);
-```
-
-:::
-
 ![chatbot-with-tools-diagram](chatbot-with-tools.png)
 
 ## 8. Ask the bot questions
 
 Now you can ask the chatbot questions outside its training data:
 
-:::python
-
 ```python
 def stream_graph_updates(user_input: str):
     for event in graph.stream({"messages": [{"role": "user", "content": user_input}]}):
@@ -524,7 +241,7 @@ while True:
         break
 ```
 
-```
+``` 
 Assistant: [{'text': "To provide you with accurate and up-to-date information about LangGraph, I'll need to search for the latest details. Let me do that for you.", 'type': 'text'}, {'id': 'toolu_01Q588CszHaSvvP2MxRq9zRD', 'input': {'query': 'LangGraph AI tool information'}, 'name': 'tavily_search_results_json', 'type': 'tool_use'}]
 Assistant: [{"url": "https://www.langchain.com/langgraph", "content": "LangGraph sets the foundation for how we can build and scale AI workloads \u2014 from conversational agents, complex task automation, to custom LLM-backed experiences that 'just work'. The next chapter in building complex production-ready features with LLMs is agentic, and with LangGraph and LangSmith, LangChain delivers an out-of-the-box solution ..."}, {"url": "https://github.com/langchain-ai/langgraph", "content": "Overview. LangGraph is a library for building stateful, multi-actor applications with LLMs, used to create agent and multi-agent workflows. Compared to other LLM frameworks, it offers these core benefits: cycles, controllability, and persistence. LangGraph allows you to define flows that involve cycles, essential for most agentic architectures ..."}]
 Assistant: Based on the search results, I can provide you with information about LangGraph:
@@ -555,99 +272,18 @@ Assistant: Based on the search results, I can provide you with information about
 
 LangGraph appears to be a significant tool in the evolving landscape of LLM-based application development, offering developers new ways to create more complex, stateful, and interactive AI systems.
 Goodbye!
+Output is truncated. View as a scrollable element or open in a text editor. Adjust cell output settings...
 ```
 
-:::
-
-:::js
-
-```typescript
-import readline from "node:readline/promises";
-
-const prompt = readline.createInterface({
-  input: process.stdin,
-  output: process.stdout,
-});
-
-async function generateText(content: string) {
-  const stream = await graph.stream(
-    { messages: [{ type: "human", content }] },
-    { streamMode: "values" }
-  );
-
-  for await (const event of stream) {
-    const lastMessage = event.messages.at(-1);
-
-    if (lastMessage?.getType() === "ai" || lastMessage?.getType() === "tool") {
-      console.log(`Assistant: ${lastMessage?.text}`);
-    }
-  }
-}
-
-while (true) {
-  const human = await prompt.question("User: ");
-  if (["quit", "exit", "q"].includes(human.trim())) break;
-  await generateText(human || "What do you know about LangGraph?");
-}
-
-prompt.close();
-```
-
-```
-User: What do you know about LangGraph?
-Assistant: I'll search for the latest information about LangGraph for you.
-Assistant: [{"title":"Introduction to LangGraph: A Beginner's Guide - Medium","url":"https://medium.com/@cplog/introduction-to-langgraph-a-beginners-guide-14f9be027141","content":"..."}]
-Assistant: Based on the search results, I can provide you with information about LangGraph:
-
-LangGraph is a library within the LangChain ecosystem designed for building stateful, multi-actor applications with Large Language Models (LLMs). Here are the key aspects:
-
-**Core Purpose:**
-- LangGraph is specifically designed for creating agent and multi-agent workflows
-- It provides a framework for defining, coordinating, and executing multiple LLM agents in a structured manner
-
-**Key Features:**
-1. **Stateful Graph Architecture**: LangGraph revolves around a stateful graph where each node represents a step in computation, and the graph maintains state that is passed around and updated as the computation progresses
-
-2. **Conditional Edges**: It supports conditional edges, allowing you to dynamically determine the next node to execute based on the current state of the graph
-
-3. **Cycles**: Unlike other LLM frameworks, LangGraph allows you to define flows that involve cycles, which is essential for most agentic architectures
-
-4. **Controllability**: It offers enhanced control over the application flow
-
-5. **Persistence**: The library provides ways to maintain state and persistence in LLM-based applications
-
-**Use Cases:**
-- Conversational agents
-- Complex task automation
-- Custom LLM-backed experiences
-- Multi-agent systems that perform complex tasks
-
-**Benefits:**
-LangGraph allows developers to focus on the high-level logic of their applications rather than the intricacies of agent coordination, making it easier to build complex, production-ready features with LLMs.
-
-This makes LangGraph a significant tool in the evolving landscape of LLM-based application development.
-```
-
-:::
-
 ## 9. Use prebuilts
 
 For ease of use, adjust your code to replace the following with LangGraph prebuilt components. These have built in functionality like parallel API execution.
 
-:::python
-
 - `BasicToolNode` is replaced with the prebuilt [ToolNode](https://langchain-ai.github.io/langgraph/reference/prebuilt/#toolnode)
 - `route_tools` is replaced with the prebuilt [tools_condition](https://langchain-ai.github.io/langgraph/reference/prebuilt/#tools_condition)
 
 {!snippets/chat_model_tabs.md!}
 
-<!---
-```python
-from langchain.chat_models import init_chat_model
-
-llm = init_chat_model("anthropic:claude-3-5-sonnet-latest")
-```
--->
 
 ```python hl_lines="25 30"
 from typing import Annotated
@@ -687,46 +323,7 @@ graph_builder.add_edge(START, "chatbot")
 graph = graph_builder.compile()
 ```
 
-:::
-
-:::js
-
-- `createToolNode` is replaced with the prebuilt [ToolNode](https://langchain-ai.github.io/langgraphjs/reference/classes/langgraph_prebuilt.ToolNode.html)
-- `routeTools` is replaced with the prebuilt [toolsCondition](https://langchain-ai.github.io/langgraphjs/reference/functions/langgraph_prebuilt.toolsCondition.html)
-
-```typescript
-import { TavilySearch } from "@langchain/tavily";
-import { ChatOpenAI } from "@langchain/openai";
-import { StateGraph, START, MessagesZodState, END } from "@langchain/langgraph";
-import { ToolNode, toolsCondition } from "@langchain/langgraph/prebuilt";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const tools = [new TavilySearch({ maxResults: 2 })];
-
-const llm = new ChatOpenAI({ model: "gpt-4o-mini" }).bindTools(tools);
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state) => ({
-    messages: [await llm.invoke(state.messages)],
-  }))
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  .compile();
-```
-
-:::
-
-**Congratulations!** You've created a conversational agent in LangGraph that can use a search engine to retrieve updated information when needed. Now it can handle a wider range of user queries.
-
-:::python
-
-To inspect all the steps your agent just took, check out this [LangSmith trace](https://smith.langchain.com/public/4fbd7636-25af-4638-9587-5a02fdbb0172/r).
-
-:::
+**Congratulations!** You've created a conversational agent in LangGraph that can use a search engine to retrieve updated information when needed. Now it can handle a wider range of user queries. To inspect all the steps your agent just took, check out this [LangSmith trace](https://smith.langchain.com/public/4fbd7636-25af-4638-9587-5a02fdbb0172/r).
 
 ## Next steps
 

docs/docs/tutorials/get-started/3-add-memory.md

@@ -2,7 +2,7 @@
 
 The chatbot can now [use tools](./2-add-tools.md) to answer user questions, but it does not remember the context of previous interactions. This limits its ability to have coherent, multi-turn conversations.
 
-LangGraph solves this problem through **persistent checkpointing**. If you provide a `checkpointer` when compiling the graph and a `thread_id` when calling your graph, LangGraph automatically saves the state after each step. When you invoke the graph again using the same `thread_id`, the graph loads its saved state, allowing the chatbot to pick up where it left off.
+LangGraph solves this problem through **persistent checkpointing**. If you provide a `checkpointer` when compiling the graph and a `thread_id` when calling your graph, LangGraph automatically saves the state after each step. When you invoke the graph again using the same `thread_id`, the graph loads its saved state, allowing the chatbot to pick up where it left off. 
 
 We will see later that **checkpointing** is _much_ more powerful than simple chat memory - it lets you save and resume complex state at any time for error recovery, human-in-the-loop workflows, time travel interactions, and more. But first, let's add checkpointing to enable multi-turn conversations.
 
@@ -14,79 +14,43 @@ We will see later that **checkpointing** is _much_ more powerful than simple cha
 
 Create a `MemorySaver` checkpointer:
 
-:::python
-
-```python
+``` python
 from langgraph.checkpoint.memory import MemorySaver
 
 memory = MemorySaver()
 ```
 
-:::
-
-:::js
-
-```typescript
-import { MemorySaver } from "@langchain/langgraph";
-
-const memory = new MemorySaver();
-```
-
-:::
-
 This is in-memory checkpointer, which is convenient for the tutorial. However, in a production application, you would likely change this to use `SqliteSaver` or `PostgresSaver` and connect a database.
 
 ## 2. Compile the graph
 
 Compile the graph with the provided checkpointer, which will checkpoint the `State` as the graph works through each node:
 
-:::python
-
-```python
+``` python
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
-:::
+``` python
+from IPython.display import Image, display
 
-:::js
-
-```typescript hl_lines="7"
-const graph = new StateGraph(State)
-  .addNode("chatbot", chatbot)
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  .compile({ checkpointer: memory });
+try:
+    display(Image(graph.get_graph().draw_mermaid_png()))
+except Exception:
+    # This requires some extra dependencies and is optional
+    pass
 ```
 
-:::
-
 ## 3. Interact with your chatbot
 
 Now you can interact with your bot!
 
-1.  Pick a thread to use as the key for this conversation.
-
-    :::python
+1. Pick a thread to use as the key for this conversation.
 
     ```python
     config = {"configurable": {"thread_id": "1"}}
     ```
 
-    :::
-
-    :::js
-
-    ```typescript
-    const config = { configurable: { thread_id: "1" } };
-    ```
-
-    :::
-
-2.  Call your chatbot:
-
-    :::python
+2. Call your chatbot:
 
     ```python
     user_input = "Hi there! My name is Will."
@@ -110,45 +74,14 @@ Now you can interact with your bot!
     Hello Will! It's nice to meet you. How can I assist you today? Is there anything specific you'd like to know or discuss?
     ```
 
-    !!! note
+    !!! note 
 
         The config was provided as the **second positional argument** when calling our graph. It importantly is _not_ nested within the graph inputs (`{'messages': []}`).
 
-    :::
-
-    :::js
-
-    ```typescript
-    const userInput = "Hi there! My name is Will.";
-
-    const events = await graph.stream(
-      { messages: [{ type: "human", content: userInput }] },
-      { configurable: { thread_id: "1" }, streamMode: "values" }
-    );
-
-    for await (const event of events) {
-      const lastMessage = event.messages.at(-1);
-      console.log(`${lastMessage?.getType()}: ${lastMessage?.text}`);
-    }
-    ```
-
-    ```
-    human: Hi there! My name is Will.
-    ai: Hello Will! It's nice to meet you. How can I assist you today? Is there anything specific you'd like to know or discuss?
-    ```
-
-    !!! note
-
-        The config was provided as the **second parameter** when calling our graph. It importantly is _not_ nested within the graph inputs (`{"messages": []}`).
-
-    :::
-
 ## 4. Ask a follow up question
 
 Ask a follow up question:
 
-:::python
-
 ```python
 user_input = "Remember my name?"
 
@@ -171,37 +104,10 @@ Remember my name?
 Of course, I remember your name, Will. I always try to pay attention to important details that users share with me. Is there anything else you'd like to talk about or any questions you have? I'm here to help with a wide range of topics or tasks.
 ```
 
-:::
-
-:::js
-
-```typescript
-const userInput2 = "Remember my name?";
-
-const events2 = await graph.stream(
-  { messages: [{ type: "human", content: userInput2 }] },
-  { configurable: { thread_id: "1" }, streamMode: "values" }
-);
-
-for await (const event of events2) {
-  const lastMessage = event.messages.at(-1);
-  console.log(`${lastMessage?.getType()}: ${lastMessage?.text}`);
-}
-```
-
-```
-human: Remember my name?
-ai: Yes, your name is Will. How can I help you today?
-```
-
-:::
-
 **Notice** that we aren't using an external list for memory: it's all handled by the checkpointer! You can inspect the full execution in this [LangSmith trace](https://smith.langchain.com/public/29ba22b5-6d40-4fbe-8d27-b369e3329c84/r) to see what's going on.
 
 Don't believe me? Try this using a different config.
 
-:::python
-
 ```python
 # The only difference is we change the `thread_id` here to "2" instead of "1"
 events = graph.stream(
@@ -223,36 +129,10 @@ Remember my name?
 I apologize, but I don't have any previous context or memory of your name. As an AI assistant, I don't retain information from past conversations. Each interaction starts fresh. Could you please tell me your name so I can address you properly in this conversation?
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="3-4"
-const events3 = await graph.stream(
-  { messages: [{ type: "human", content: userInput2 }] },
-  // The only difference is we change the `thread_id` here to "2" instead of "1"
-  { configurable: { thread_id: "2" }, streamMode: "values" }
-);
-
-for await (const event of events3) {
-  const lastMessage = event.messages.at(-1);
-  console.log(`${lastMessage?.getType()}: ${lastMessage?.text}`);
-}
-```
-
-```
-human: Remember my name?
-ai: I don't have the ability to remember personal information about users between interactions. However, I'm here to help you with any questions or topics you want to discuss!
-```
-
-:::
-
 **Notice** that the **only** change we've made is to modify the `thread_id` in the config. See this call's [LangSmith trace](https://smith.langchain.com/public/51a62351-2f0a-4058-91cc-9996c5561428/r) for comparison.
 
 ## 5. Inspect the state
 
-:::python
-
 By now, we have made a few checkpoints across two different threads. But what goes into a checkpoint? To inspect a graph's `state` for a given config at any time, call `get_state(config)`.
 
 ```python
@@ -268,94 +148,12 @@ StateSnapshot(values={'messages': [HumanMessage(content='Hi there! My name is Wi
 snapshot.next  # (since the graph ended this turn, `next` is empty. If you fetch a state from within a graph invocation, next tells which node will execute next)
 ```
 
-:::
-
-:::js
-
-By now, we have made a few checkpoints across two different threads. But what goes into a checkpoint? To inspect a graph's `state` for a given config at any time, call `getState(config)`.
-
-```typescript
-await graph.getState({ configurable: { thread_id: "1" } });
-```
-
-```typescript
-{
-  values: {
-    messages: [
-      HumanMessage {
-        "id": "32fabcef-b3b8-481f-8bcb-fd83399a5f8d",
-        "content": "Hi there! My name is Will.",
-        "additional_kwargs": {},
-        "response_metadata": {}
-      },
-      AIMessage {
-        "id": "chatcmpl-BrPbTsCJbVqBvXWySlYoTJvM75Kv8",
-        "content": "Hello Will! How can I assist you today?",
-        "additional_kwargs": {},
-        "response_metadata": {},
-        "tool_calls": [],
-        "invalid_tool_calls": []
-      },
-      HumanMessage {
-        "id": "561c3aad-f8fc-4fac-94a6-54269a220856",
-        "content": "Remember my name?",
-        "additional_kwargs": {},
-        "response_metadata": {}
-      },
-      AIMessage {
-        "id": "chatcmpl-BrPbU4BhhsUikGbW37hYuF5vvnnE2",
-        "content": "Yes, I remember your name, Will! How can I help you today?",
-        "additional_kwargs": {},
-        "response_metadata": {},
-        "tool_calls": [],
-        "invalid_tool_calls": []
-      }
-    ]
-  },
-  next: [],
-  tasks: [],
-  metadata: {
-    source: 'loop',
-    step: 4,
-    parents: {},
-    thread_id: '1'
-  },
-  config: {
-    configurable: {
-      thread_id: '1',
-      checkpoint_id: '1f05cccc-9bb6-6270-8004-1d2108bcec77',
-      checkpoint_ns: ''
-    }
-  },
-  createdAt: '2025-07-09T13:58:27.607Z',
-  parentConfig: {
-    configurable: {
-      thread_id: '1',
-      checkpoint_ns: '',
-      checkpoint_id: '1f05cccc-78fa-68d0-8003-ffb01a76b599'
-    }
-  }
-}
-```
-
-```typescript
-import * as assert from "node:assert";
-
-// Since the graph ended this turn, `next` is empty.
-// If you fetch a state from within a graph invocation, next tells which node will execute next)
-assert.deepEqual(snapshot.next, []);
-```
-
-:::
-
 The snapshot above contains the current state values, corresponding config, and the `next` node to process. In our case, the graph has reached an `END` state, so `next` is empty.
 
 **Congratulations!** Your chatbot can now maintain conversation state across sessions thanks to LangGraph's checkpointing system. This opens up exciting possibilities for more natural, contextual interactions. LangGraph's checkpointing even handles **arbitrarily complex graph states**, which is much more expressive and powerful than simple chat memory.
-
+  
 Check out the code snippet below to review the graph from this tutorial:
 
-:::python
-
 {!snippets/chat_model_tabs.md!}
 
 <!---
@@ -406,43 +204,6 @@ memory = MemorySaver()
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="16 26"
-import { END, MessagesZodState, START } from "@langchain/langgraph";
-import { ChatOpenAI } from "@langchain/openai";
-import { TavilySearch } from "@langchain/tavily";
-
-import { MemorySaver } from "@langchain/langgraph";
-import { StateGraph } from "@langchain/langgraph";
-import { ToolNode, toolsCondition } from "@langchain/langgraph/prebuilt";
-import { z } from "zod";
-
-const State = z.object({
-  messages: MessagesZodState.shape.messages,
-});
-
-const tools = [new TavilySearch({ maxResults: 2 })];
-const llm = new ChatOpenAI({ model: "gpt-4o-mini" }).bindTools(tools);
-// highlight-next-line
-const memory = new MemorySaver();
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state) => ({
-    messages: [await llm.invoke(state.messages)],
-  }))
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  // highlight-next-line
-  .compile({ checkpointer: memory });
-```
-
-:::
-
 ## Next steps
 
 In the next tutorial, you will [add human-in-the-loop to the chatbot](./4-human-in-the-loop.md) to handle situations where it may need guidance or verification before proceeding.

docs/docs/tutorials/get-started/4-human-in-the-loop.md

@@ -2,15 +2,7 @@
 
 Agents can be unreliable and may need human input to successfully accomplish tasks. Similarly, for some actions, you may want to require human approval before running to ensure that everything is running as intended.
 
-LangGraph's [persistence](../../concepts/persistence.md) layer supports **human-in-the-loop** workflows, allowing execution to pause and resume based on user feedback. The primary interface to this functionality is the [`interrupt`](../../how-tos/human_in_the_loop/add-human-in-the-loop.md) function. Calling `interrupt` inside a node will pause execution. Execution can be resumed, together with new input from a human, by passing in a [Command](../../concepts/low_level.md#command).
-
-:::python
-`interrupt` is ergonomically similar to Python's built-in `input()`, [with some caveats](../../how-tos/human_in_the_loop/add-human-in-the-loop.md).
-:::
-
-:::js
-`interrupt` is ergonomically similar to Node.js's built-in `readline.question()` function, [with some caveats](../../how-tos/human_in_the_loop/add-human-in-the-loop.md).
-:::
+LangGraph's [persistence](../../concepts/persistence.md) layer supports **human-in-the-loop** workflows, allowing execution to pause and resume based on user feedback. The primary interface to this functionality is the [`interrupt`](../../how-tos/human_in_the_loop/add-human-in-the-loop.md) function. Calling `interrupt` inside a node will pause execution. Execution can be resumed, together with new input from a human, by passing in a [Command](../../concepts/low_level.md#command). `interrupt` is ergonomically similar to Python's built-in `input()`, [with some caveats](../../how-tos/human_in_the_loop/add-human-in-the-loop.md).
 
 !!! note
 
@@ -22,7 +14,6 @@ Starting with the existing code from the [Add memory to the chatbot](./3-add-mem
 
 Let's first select a chat model:
 
-:::python
 {!snippets/chat_model_tabs.md!}
 
 <!---
@@ -33,22 +24,9 @@ llm = init_chat_model("anthropic:claude-3-5-sonnet-latest")
 ```
 -->
 
-:::
-
-:::js
-
-```typescript
-// Add your API key here
-process.env.ANTHROPIC_API_KEY = "YOUR_API_KEY";
-```
-
-:::
-
 We can now incorporate it into our `StateGraph` with an additional tool:
 
-:::python
-
-```python hl_lines="12 19 20 21 22 23"
+``` python hl_lines="12 19 20 21 22 23"
 from typing import Annotated
 
 from langchain_tavily import TavilySearch
@@ -98,54 +76,6 @@ graph_builder.add_edge("tools", "chatbot")
 graph_builder.add_edge(START, "chatbot")
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="1 7-19"
-import { interrupt, MessagesZodState } from "@langchain/langgraph";
-import { ChatAnthropic } from "@langchain/anthropic";
-import { TavilySearch } from "@langchain/tavily";
-import { tool } from "@langchain/core/tools";
-import { z } from "zod";
-
-const humanAssistance = tool(
-  async ({ query }) => {
-    const humanResponse = interrupt({ query });
-    return humanResponse.data;
-  },
-  {
-    name: "humanAssistance",
-    description: "Request assistance from a human.",
-    schema: z.object({
-      query: z.string().describe("Human readable question for the human"),
-    }),
-  }
-);
-
-const searchTool = new TavilySearch({ maxResults: 2 });
-const tools = [searchTool, humanAssistance];
-
-const llmWithTools = new ChatAnthropic({
-  model: "claude-3-5-sonnet-latest",
-}).bindTools(tools);
-
-async function chatbot(state: z.infer<typeof MessagesZodState>) {
-  const message = await llmWithTools.invoke(state.messages);
-
-  // Because we will be interrupting during tool execution,
-  // we disable parallel tool calling to avoid repeating any
-  // tool invocations when we resume.
-  if (message.tool_calls && message.tool_calls.length > 1) {
-    throw new Error("Multiple tool calls not supported with interrupts");
-  }
-
-  return { messages: message };
-}
-```
-
-:::
-
 !!! tip
 
     For more information and examples of human-in-the-loop workflows, see [Human-in-the-loop](../../concepts/human_in_the_loop.md).
@@ -154,41 +84,17 @@ async function chatbot(state: z.infer<typeof MessagesZodState>) {
 
 We compile the graph with a checkpointer, as before:
 
-:::python
-
 ```python
 memory = MemorySaver()
 
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
-:::
-
-:::js
-
-```typescript hl_lines="3 11"
-import { StateGraph, MemorySaver, START, END } from "@langchain/langgraph";
-
-const memory = new MemorySaver();
-
-const graph = new StateGraph(MessagesZodState)
-  .addNode("chatbot", chatbot)
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  .compile({ checkpointer: memory });
-```
-
-:::
-
 ## 3. Visualize the graph (optional)
 
 Visualizing the graph, you get the same layout as before – just with the added tool!
 
-:::python
-
-```python
+``` python
 from IPython.display import Image, display
 
 try:
@@ -198,30 +104,12 @@ except Exception:
     pass
 ```
 
-:::
-
-:::js
-
-```typescript
-import * as fs from "node:fs/promises";
-
-const drawableGraph = await graph.getGraphAsync();
-const image = await drawableGraph.drawMermaidPng();
-const imageBuffer = new Uint8Array(await image.arrayBuffer());
-
-await fs.writeFile("chatbot-with-tools.png", imageBuffer);
-```
-
-:::
-
 ![chatbot-with-tools-diagram](chatbot-with-tools.png)
 
 ## 4. Prompt the chatbot
 
 Now, prompt the chatbot with a question that will engage the new `human_assistance` tool:
 
-:::python
-
 ```python
 user_input = "I need some expert guidance for building an AI agent. Could you request assistance for me?"
 config = {"configurable": {"thread_id": "1"}}
@@ -250,58 +138,8 @@ Tool Calls:
     query: A user is requesting expert guidance for building an AI agent. Could you please provide some expert advice or resources on this topic?
 ```
 
-:::
-
-:::js
-
-```typescript
-import { isAIMessage } from "@langchain/core/messages";
-
-const userInput =
-  "I need some expert guidance for building an AI agent. Could you request assistance for me?";
-
-const events = await graph.stream(
-  { messages: [{ role: "user", content: userInput }] },
-  { configurable: { thread_id: "1" }, streamMode: "values" }
-);
-
-for await (const event of events) {
-  if ("messages" in event) {
-    const lastMessage = event.messages.at(-1);
-    console.log(`[${lastMessage?.getType()}]: ${lastMessage?.text}`);
-
-    if (
-      lastMessage &&
-      isAIMessage(lastMessage) &&
-      lastMessage.tool_calls?.length
-    ) {
-      console.log("Tool calls:", lastMessage.tool_calls);
-    }
-  }
-}
-```
-
-```
-[human]: I need some expert guidance for building an AI agent. Could you request assistance for me?
-[ai]: I'll help you request human assistance for guidance on building an AI agent.
-Tool calls: [
-  {
-    name: 'humanAssistance',
-    args: {
-      query: 'I would like expert guidance on building an AI agent. Could you please provide assistance with this topic?'
-    },
-    id: 'toolu_01Bpxc8rFVMhSaRosS6b85Ts',
-    type: 'tool_call'
-  }
-]
-```
-
-:::
-
 The chatbot generated a tool call, but then execution has been interrupted. If you inspect the graph state, you see that it stopped at the tools node:
 
-:::python
-
 ```python
 snapshot = graph.get_state(config)
 snapshot.next
@@ -311,25 +149,8 @@ snapshot.next
 ('tools',)
 ```
 
-:::
-
-:::js
-
-```typescript
-const snapshot = await graph.getState({ configurable: { thread_id: "1" } });
-snapshot.next;
-```
-
-```json
-["tools"]
-```
-
-:::
-
 !!! info Additional information
 
-    :::python
-
     Take a closer look at the `human_assistance` tool:
 
     ```python
@@ -341,40 +162,12 @@ snapshot.next;
     ```
 
     Similar to Python's built-in `input()` function, calling `interrupt` inside the tool will pause execution. Progress is persisted based on the [checkpointer](../../concepts/persistence.md#checkpointer-libraries); so if it is persisting with Postgres, it can resume at any time as long as the database is alive. In this example, it is persisting with the in-memory checkpointer and can resume any time if the Python kernel is running.
-    :::
-
-    :::js
-
-    Take a closer look at the `humanAssistance` tool:
-
-    ```typescript hl_lines="3"
-    const humanAssistance = tool(
-      async ({ query }) => {
-        const humanResponse = interrupt({ query });
-        return humanResponse.data;
-      },
-      {
-        name: "humanAssistance",
-        description: "Request assistance from a human.",
-        schema: z.object({
-          query: z.string().describe("Human readable question for the human"),
-        }),
-      },
-    );
-    ```
-
-    Calling `interrupt` inside the tool will pause execution. Progress is persisted based on the [checkpointer](../../concepts/persistence.md#checkpointer-libraries); so if it is persisting with Postgres, it can resume at any time as long as the database is alive. In this example, it is persisting with the in-memory checkpointer and can resume any time if the JavaScript runtime is running.
-    :::
 
 ## 5. Resume execution
 
-To resume execution, pass a [`Command`](../../concepts/low_level.md#command) object containing data expected by the tool. The format of this data can be customized based on needs.
+To resume execution, pass a [`Command`](../../concepts/low_level.md#command) object containing data expected by the tool. The format of this data can be customized based on needs. For this example, use a dict with a key `"data"`:
 
-:::python
-
-For this example, use a dict with a key `"data"`:
-
-```python
+``` python
 human_response = (
     "We, the experts are here to help! We'd recommend you check out LangGraph to build your agent."
     " It's much more reliable and extensible than simple autonomous agents."
@@ -422,60 +215,12 @@ If you'd like more specific information about LangGraph or have any questions ab
 Output is truncated. View as a scrollable element or open in a text editor. Adjust cell output settings...
 ```
 
-:::
-
-:::js
-For this example, use an object with a key `"data"`:
-
-```typescript
-import { Command } from "@langchain/langgraph";
-
-const humanResponse =
-  "We, the experts are here to help! We'd recommend you check out LangGraph to build your agent." +
-  " It's much more reliable and extensible than simple autonomous agents.";
-
-const humanCommand = new Command({ resume: { data: humanResponse } });
-
-const resumeEvents = await graph.stream(humanCommand, {
-  configurable: { thread_id: "1" },
-  streamMode: "values",
-});
-
-for await (const event of resumeEvents) {
-  if ("messages" in event) {
-    const lastMessage = event.messages.at(-1);
-    console.log(`[${lastMessage?.getType()}]: ${lastMessage?.text}`);
-  }
-}
-```
-
-```
-[tool]: We, the experts are here to help! We'd recommend you check out LangGraph to build your agent. It's much more reliable and extensible than simple autonomous agents.
-[ai]: Thank you for your patience. I've received some expert advice regarding your request for guidance on building an AI agent. Here's what the experts have suggested:
-
-The experts recommend that you look into LangGraph for building your AI agent. They mention that LangGraph is a more reliable and extensible option compared to simple autonomous agents.
-
-LangGraph is likely a framework or library designed specifically for creating AI agents with advanced capabilities. Here are a few points to consider based on this recommendation:
-
-1. Reliability: The experts emphasize that LangGraph is more reliable than simpler autonomous agent approaches. This could mean it has better stability, error handling, or consistent performance.
-
-2. Extensibility: LangGraph is described as more extensible, which suggests that it probably offers a flexible architecture that allows you to easily add new features or modify existing ones as your agent's requirements evolve.
-
-3. Advanced capabilities: Given that it's recommended over "simple autonomous agents," LangGraph likely provides more sophisticated tools and techniques for building complex AI agents.
-
-...
-```
-
-:::
-
 The input has been received and processed as a tool message. Review this call's [LangSmith trace](https://smith.langchain.com/public/9f0f87e3-56a7-4dde-9c76-b71675624e91/r) to see the exact work that was done in the above call. Notice that the state is loaded in the first step so that our chatbot can continue where it left off.
 
 **Congratulations!** You've used an `interrupt` to add human-in-the-loop execution to your chatbot, allowing for human oversight and intervention when needed. This opens up the potential UIs you can create with your AI systems. Since you have already added a **checkpointer**, as long as the underlying persistence layer is running, the graph can be paused **indefinitely** and resumed at any time as if nothing had happened.
 
 Check out the code snippet below to review the graph from this tutorial:
 
-:::python
-
 {!snippets/chat_model_tabs.md!}
 
 ```python
@@ -527,73 +272,6 @@ memory = MemorySaver()
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
-:::
-
-:::js
-
-```typescript
-import {
-  interrupt,
-  MessagesZodState,
-  StateGraph,
-  MemorySaver,
-  START,
-  END,
-} from "@langchain/langgraph";
-import { ToolNode, toolsCondition } from "@langchain/langgraph/prebuilt";
-import { isAIMessage } from "@langchain/core/messages";
-import { ChatAnthropic } from "@langchain/anthropic";
-import { TavilySearch } from "@langchain/tavily";
-import { tool } from "@langchain/core/tools";
-import { z } from "zod";
-
-const humanAssistance = tool(
-  async ({ query }) => {
-    const humanResponse = interrupt({ query });
-    return humanResponse.data;
-  },
-  {
-    name: "humanAssistance",
-    description: "Request assistance from a human.",
-    schema: z.object({
-      query: z.string().describe("Human readable question for the human"),
-    }),
-  }
-);
-
-const searchTool = new TavilySearch({ maxResults: 2 });
-const tools = [searchTool, humanAssistance];
-
-const llmWithTools = new ChatAnthropic({
-  model: "claude-3-5-sonnet-latest",
-}).bindTools(tools);
-
-const chatbot = async (state: z.infer<typeof MessagesZodState>) => {
-  const message = await llmWithTools.invoke(state.messages);
-
-  // Because we will be interrupting during tool execution,
-  // we disable parallel tool calling to avoid repeating any
-  // tool invocations when we resume.
-  if (message.tool_calls && message.tool_calls.length > 1) {
-    throw new Error("Multiple tool calls not supported with interrupts");
-  }
-
-  return { messages: message };
-};
-
-const memory = new MemorySaver();
-
-const graph = new StateGraph(MessagesZodState)
-  .addNode("chatbot", chatbot)
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  .compile({ checkpointer: memory });
-```
-
-:::
-
 ## Next steps
 
-So far, the tutorial examples have relied on a simple state with one entry: a list of messages. You can go far with this simple state, but if you want to define complex behavior without relying on the message list, you can [add additional fields to the state](./5-customize-state.md).
+So far, the tutorial examples have relied on a simple state with one entry: a list of messages. You can go far with this simple state, but if you want to define complex behavior without relying on the message list, you can [add additional fields to the state](./5-customize-state.md).

docs/docs/tutorials/get-started/5-customize-state.md

@@ -10,8 +10,6 @@ In this tutorial, you will add additional fields to the state to define complex
 
 Update the chatbot to research the birthday of an entity by adding `name` and `birthday` keys to the state:
 
-:::python
-
 ```python
 from typing import Annotated
 
@@ -28,34 +26,13 @@ class State(TypedDict):
     birthday: str
 ```
 
-:::
-
-:::js
-
-```typescript
-import { MessagesZodState } from "@langchain/langgraph";
-import { z } from "zod";
-
-const State = z.object({
-  messages: MessagesZodState.shape.messages,
-  // highlight-next-line
-  name: z.string(),
-  // highlight-next-line
-  birthday: z.string(),
-});
-```
-
-:::
-
 Adding this information to the state makes it easily accessible by other graph nodes (like a downstream node that stores or processes the information), as well as the graph's persistence layer.
 
 ## 2. Update the state inside the tool
 
-:::python
-
 Now, populate the state keys inside of the `human_assistance` tool. This allows a human to review the information before it is stored in the state. Use [`Command`](../../concepts/low_level.md#using-inside-tools) to issue a state update from inside the tool.
 
-```python
+``` python
 from langchain_core.messages import ToolMessage
 from langchain_core.tools import InjectedToolCallId, tool
 
@@ -99,78 +76,10 @@ def human_assistance(
     return Command(update=state_update)
 ```
 
-:::
-
-:::js
-
-Now, populate the state keys inside of the `humanAssistance` tool. This allows a human to review the information before it is stored in the state. Use [`Command`](../../concepts/low_level.md#using-inside-tools) to issue a state update from inside the tool.
-
-```typescript
-import { tool } from "@langchain/core/tools";
-import { ToolMessage } from "@langchain/core/messages";
-import { Command, interrupt } from "@langchain/langgraph";
-
-const humanAssistance = tool(
-  async (input, config) => {
-    // Note that because we are generating a ToolMessage for a state update,
-    // we generally require the ID of the corresponding tool call.
-    // This is available in the tool's config.
-    const toolCallId = config?.toolCall?.id as string | undefined;
-    if (!toolCallId) throw new Error("Tool call ID is required");
-
-    const humanResponse = await interrupt({
-      question: "Is this correct?",
-      name: input.name,
-      birthday: input.birthday,
-    });
-
-    // We explicitly update the state with a ToolMessage inside the tool.
-    const stateUpdate = (() => {
-      // If the information is correct, update the state as-is.
-      if (humanResponse.correct?.toLowerCase().startsWith("y")) {
-        return {
-          name: input.name,
-          birthday: input.birthday,
-          messages: [
-            new ToolMessage({ content: "Correct", tool_call_id: toolCallId }),
-          ],
-        };
-      }
-
-      // Otherwise, receive information from the human reviewer.
-      return {
-        name: humanResponse.name || input.name,
-        birthday: humanResponse.birthday || input.birthday,
-        messages: [
-          new ToolMessage({
-            content: `Made a correction: ${JSON.stringify(humanResponse)}`,
-            tool_call_id: toolCallId,
-          }),
-        ],
-      };
-    })();
-
-    // We return a Command object in the tool to update our state.
-    return new Command({ update: stateUpdate });
-  },
-  {
-    name: "humanAssistance",
-    description: "Request assistance from a human.",
-    schema: z.object({
-      name: z.string().describe("The name of the entity"),
-      birthday: z.string().describe("The birthday/release date of the entity"),
-    }),
-  }
-);
-```
-
-:::
-
 The rest of the graph stays the same.
 
 ## 3. Prompt the chatbot
 
-:::python
 Prompt the chatbot to look up the "birthday" of the LangGraph library and direct the chatbot to reach out to the `human_assistance` tool once it has the required information. By setting `name` and `birthday` in the arguments for the tool, you force the chatbot to generate proposals for these fields.
 
 ```python
@@ -190,51 +99,6 @@ for event in events:
         event["messages"][-1].pretty_print()
 ```
 
-:::
-
-:::js
-Prompt the chatbot to look up the "birthday" of the LangGraph library and direct the chatbot to reach out to the `humanAssistance` tool once it has the required information. By setting `name` and `birthday` in the arguments for the tool, you force the chatbot to generate proposals for these fields.
-
-```typescript
-import { isAIMessage } from "@langchain/core/messages";
-
-const userInput =
-  "Can you look up when LangGraph was released? " +
-  "When you have the answer, use the humanAssistance tool for review.";
-
-const events = await graph.stream(
-  { messages: [{ role: "user", content: userInput }] },
-  { configurable: { thread_id: "1" }, streamMode: "values" }
-);
-
-for await (const event of events) {
-  if ("messages" in event) {
-    const lastMessage = event.messages.at(-1);
-
-    console.log(
-      "=".repeat(32),
-      `${lastMessage?.getType()} Message`,
-      "=".repeat(32)
-    );
-    console.log(lastMessage?.text);
-
-    if (
-      lastMessage &&
-      isAIMessage(lastMessage) &&
-      lastMessage.tool_calls?.length
-    ) {
-      console.log("Tool Calls:");
-      for (const call of lastMessage.tool_calls) {
-        console.log(`  ${call.name} (${call.id})`);
-        console.log(`  Args: ${JSON.stringify(call.args)}`);
-      }
-    }
-  }
-}
-```
-
-:::
-
 ```
 ================================ Human Message =================================
 
@@ -262,20 +126,12 @@ Tool Calls:
     birthday: 2023-01-01
 ```
 
-:::python
 We've hit the `interrupt` in the `human_assistance` tool again.
-:::
-
-:::js
-We've hit the `interrupt` in the `humanAssistance` tool again.
-:::
 
 ## 4. Add human assistance
 
 The chatbot failed to identify the correct date, so supply it with information:
 
-:::python
-
 ```python
 human_command = Command(
     resume={
@@ -290,53 +146,6 @@ for event in events:
         event["messages"][-1].pretty_print()
 ```
 
-:::
-
-:::js
-
-```typescript
-import { Command } from "@langchain/langgraph";
-
-const humanCommand = new Command({
-  resume: {
-    name: "LangGraph",
-    birthday: "Jan 17, 2024",
-  },
-});
-
-const resumeEvents = await graph.stream(humanCommand, {
-  configurable: { thread_id: "1" },
-  streamMode: "values",
-});
-
-for await (const event of resumeEvents) {
-  if ("messages" in event) {
-    const lastMessage = event.messages.at(-1);
-
-    console.log(
-      "=".repeat(32),
-      `${lastMessage?.getType()} Message`,
-      "=".repeat(32)
-    );
-    console.log(lastMessage?.text);
-
-    if (
-      lastMessage &&
-      isAIMessage(lastMessage) &&
-      lastMessage.tool_calls?.length
-    ) {
-      console.log("Tool Calls:");
-      for (const call of lastMessage.tool_calls) {
-        console.log(`  ${call.name} (${call.id})`);
-        console.log(`  Args: ${JSON.stringify(call.args)}`);
-      }
-    }
-  }
-}
-```
-
-:::
-
 ```
 ================================== Ai Message ==================================
 
@@ -366,8 +175,6 @@ It's worth noting that LangGraph had been in development and use for some time b
 
 Note that these fields are now reflected in the state:
 
-:::python
-
 ```python
 snapshot = graph.get_state(config)
 
@@ -378,34 +185,13 @@ snapshot = graph.get_state(config)
 {'name': 'LangGraph', 'birthday': 'Jan 17, 2024'}
 ```
 
-:::
-
-:::js
-
-```typescript
-const snapshot = await graph.getState(config);
-
-const relevantState = Object.fromEntries(
-  Object.entries(snapshot.values).filter(([k]) =>
-    ["name", "birthday"].includes(k)
-  )
-);
-```
-
-```
-{ name: 'LangGraph', birthday: 'Jan 17, 2024' }
-```
-
-:::
-
 This makes them easily accessible to downstream nodes (e.g., a node that further processes or stores the information).
 
 ## 5. Manually update the state
 
-:::python
 LangGraph gives a high degree of control over the application state. For instance, at any point (including when interrupted), you can manually override a key using `graph.update_state`:
 
-```python
+``` python
 graph.update_state(config, {"name": "LangGraph (library)"})
 ```
 
@@ -415,36 +201,11 @@ graph.update_state(config, {"name": "LangGraph (library)"})
   'checkpoint_id': '1efd4ec5-cf69-6352-8006-9278f1730162'}}
 ```
 
-:::
-
-:::js
-LangGraph gives a high degree of control over the application state. For instance, at any point (including when interrupted), you can manually override a key using `graph.updateState`:
-
-```typescript
-await graph.updateState(
-  { configurable: { thread_id: "1" } },
-  { name: "LangGraph (library)" }
-);
-```
-
-```typescript
-{
-  configurable: {
-    thread_id: '1',
-    checkpoint_ns: '',
-    checkpoint_id: '1efd4ec5-cf69-6352-8006-9278f1730162'
-  }
-}
-```
-
-:::
-
 ## 6. View the new value
 
-:::python
 If you call `graph.get_state`, you can see the new value is reflected:
 
-```python
+``` python
 snapshot = graph.get_state(config)
 
 {k: v for k, v in snapshot.values.items() if k in ("name", "birthday")}
@@ -454,35 +215,12 @@ snapshot = graph.get_state(config)
 {'name': 'LangGraph (library)', 'birthday': 'Jan 17, 2024'}
 ```
 
-:::
-
-:::js
-If you call `graph.getState`, you can see the new value is reflected:
-
-```typescript
-const updatedSnapshot = await graph.getState(config);
-
-const updatedRelevantState = Object.fromEntries(
-  Object.entries(updatedSnapshot.values).filter(([k]) =>
-    ["name", "birthday"].includes(k)
-  )
-);
-```
-
-```typescript
-{ name: 'LangGraph (library)', birthday: 'Jan 17, 2024' }
-```
-
-:::
-
 Manual state updates will [generate a trace](https://smith.langchain.com/public/7ebb7827-378d-49fe-9f6c-5df0e90086c8/r) in LangSmith. If desired, they can also be used to [control human-in-the-loop workflows](../../how-tos/human_in_the_loop/add-human-in-the-loop.md). Use of the `interrupt` function is generally recommended instead, as it allows data to be transmitted in a human-in-the-loop interaction independently of state updates.
 
 **Congratulations!** You've added custom keys to the state to facilitate a more complex workflow, and learned how to generate state updates from inside tools.
 
 Check out the code snippet below to review the graph from this tutorial:
 
-:::python
-
 {!snippets/chat_model_tabs.md!}
 
 <!---
@@ -567,111 +305,7 @@ memory = MemorySaver()
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
-:::
-
-:::js
-
-```typescript
-import {
-  Command,
-  interrupt,
-  MessagesZodState,
-  MemorySaver,
-  StateGraph,
-  END,
-  START,
-} from "@langchain/langgraph";
-import { ToolNode, toolsCondition } from "@langchain/langgraph/prebuilt";
-import { ChatAnthropic } from "@langchain/anthropic";
-import { TavilySearch } from "@langchain/tavily";
-import { ToolMessage } from "@langchain/core/messages";
-import { tool } from "@langchain/core/tools";
-import { z } from "zod";
-
-const State = z.object({
-  messages: MessagesZodState.shape.messages,
-  name: z.string(),
-  birthday: z.string(),
-});
-
-const humanAssistance = tool(
-  async (input, config) => {
-    // Note that because we are generating a ToolMessage for a state update, we
-    // generally require the ID of the corresponding tool call. This is available
-    // in the tool's config.
-    const toolCallId = config?.toolCall?.id as string | undefined;
-    if (!toolCallId) throw new Error("Tool call ID is required");
-
-    const humanResponse = await interrupt({
-      question: "Is this correct?",
-      name: input.name,
-      birthday: input.birthday,
-    });
-
-    // We explicitly update the state with a ToolMessage inside the tool.
-    const stateUpdate = (() => {
-      // If the information is correct, update the state as-is.
-      if (humanResponse.correct?.toLowerCase().startsWith("y")) {
-        return {
-          name: input.name,
-          birthday: input.birthday,
-          messages: [
-            new ToolMessage({ content: "Correct", tool_call_id: toolCallId }),
-          ],
-        };
-      }
-
-      // Otherwise, receive information from the human reviewer.
-      return {
-        name: humanResponse.name || input.name,
-        birthday: humanResponse.birthday || input.birthday,
-        messages: [
-          new ToolMessage({
-            content: `Made a correction: ${JSON.stringify(humanResponse)}`,
-            tool_call_id: toolCallId,
-          }),
-        ],
-      };
-    })();
-
-    // We return a Command object in the tool to update our state.
-    return new Command({ update: stateUpdate });
-  },
-  {
-    name: "humanAssistance",
-    description: "Request assistance from a human.",
-    schema: z.object({
-      name: z.string().describe("The name of the entity"),
-      birthday: z.string().describe("The birthday/release date of the entity"),
-    }),
-  }
-);
-
-const searchTool = new TavilySearch({ maxResults: 2 });
-
-const tools = [searchTool, humanAssistance];
-const llmWithTools = new ChatAnthropic({
-  model: "claude-3-5-sonnet-latest",
-}).bindTools(tools);
-
-const memory = new MemorySaver();
-
-const chatbot = async (state: z.infer<typeof State>) => {
-  const message = await llmWithTools.invoke(state.messages);
-  return { messages: message };
-};
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", chatbot)
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  .compile({ checkpointer: memory });
-```
-
-:::
-
 ## Next steps
 
-There's one more concept to review before finishing the LangGraph basics tutorials: connecting `checkpointing` and `state updates` to [time travel](./6-time-travel.md).
+There's one more concept to review before finishing the LangGraph basics tutorials: connecting `checkpointing` and `state updates` to [time travel](./6-time-travel.md). 
+

docs/docs/tutorials/get-started/6-time-travel.md

@@ -4,7 +4,7 @@ In a typical chatbot workflow, the user interacts with the bot one or more times
 
 What if you want a user to be able to start from a previous response and explore a different outcome? Or what if you want users to be able to rewind your chatbot's work to fix mistakes or try a different strategy, something that is common in applications like autonomous software engineers?
 
-You can create these types of experiences using LangGraph's built-in **time travel** functionality.
+You can create these types of experiences using LangGraph's built-in **time travel** functionality. 
 
 !!! note
 
@@ -12,15 +12,7 @@ You can create these types of experiences using LangGraph's built-in **time trav
 
 ## 1. Rewind your graph
 
-:::python
 Rewind your graph by fetching a checkpoint using the graph's `get_state_history` method. You can then resume execution at this previous point in time.
-:::
-
-:::js
-Rewind your graph by fetching a checkpoint using the graph's `getStateHistory` method. You can then resume execution at this previous point in time.
-:::
-
-:::python
 
 {!snippets/chat_model_tabs.md!}
 
@@ -72,49 +64,11 @@ memory = MemorySaver()
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
-:::
-
-:::js
-
-```typescript
-import {
-  StateGraph,
-  START,
-  END,
-  MessagesZodState,
-  MemorySaver,
-} from "@langchain/langgraph";
-import { ToolNode, toolsCondition } from "@langchain/langgraph/prebuilt";
-import { TavilySearch } from "@langchain/tavily";
-import { ChatOpenAI } from "@langchain/openai";
-import { z } from "zod";
-
-const State = z.object({ messages: MessagesZodState.shape.messages });
-
-const tools = [new TavilySearch({ maxResults: 2 })];
-const llmWithTools = new ChatOpenAI({ model: "gpt-4o-mini" }).bindTools(tools);
-const memory = new MemorySaver();
-
-const graph = new StateGraph(State)
-  .addNode("chatbot", async (state) => ({
-    messages: [await llmWithTools.invoke(state.messages)],
-  }))
-  .addNode("tools", new ToolNode(tools))
-  .addConditionalEdges("chatbot", toolsCondition, ["tools", END])
-  .addEdge("tools", "chatbot")
-  .addEdge(START, "chatbot")
-  .compile({ checkpointer: memory });
-```
-
-:::
-
 ## 2. Add steps
 
 Add steps to your graph. Every step will be checkpointed in its state history:
 
-:::python
-
-```python
+``` python
 config = {"configurable": {"thread_id": "1"}}
 events = graph.stream(
     {
@@ -205,7 +159,7 @@ Tool Calls:
 ================================= Tool Message =================================
 Name: tavily_search_results_json
 
-[{"url": "https://towardsdatascience.com/building-autonomous-multi-tool-agents-with-gemini-2-0-and-langgraph-ad3d7bd5e79d", "content": "Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph | by Youness Mansar | Jan, 2025 | Towards Data Science Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph A practical tutorial with full code examples for building and running multi-tool agents Towards Data Science LLMs are remarkable — they can memorize vast amounts of information, answer general knowledge questions, write code, generate stories, and even fix your grammar. In this tutorial, we are going to build a simple LLM agent that is equipped with four tools that it can use to answer a user's question. This Agent will have the following specifications: Follow Published in Towards Data Science --------------------------------- Your home for data science and AI. Follow Follow Follow"}, {"url": "https://github.com/anmolaman20/Tools_and_Agents", "content": "GitHub - anmolaman20/Tools_and_Agents: This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository serves as a comprehensive guide for building AI-powered agents using Langchain and Langgraph. It provides hands-on examples, practical tutorials, and resources for developers and AI enthusiasts to master building intelligent systems and workflows. AI Agent Development: Gain insights into creating intelligent systems that think, reason, and adapt in real time. This repository is ideal for AI practitioners, developers exploring language models, or anyone interested in building intelligent systems. This repository provides resources for building AI agents using Langchain and Langgraph."}]
+[{"url": "https://towardsdatascience.com/building-autonomous-multi-tool-agents-with-gemini-2-0-and-langgraph-ad3d7bd5e79d", "content": "Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph | by Youness Mansar | Jan, 2025 | Towards Data Science Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph A practical tutorial with full code examples for building and running multi-tool agents Towards Data Science LLMs are remarkable — they can memorize vast amounts of information, answer general knowledge questions, write code, generate stories, and even fix your grammar. In this tutorial, we are going to build a simple LLM agent that is equipped with four tools that it can use to answer a user’s question. This Agent will have the following specifications: Follow Published in Towards Data Science --------------------------------- Your home for data science and AI. Follow Follow Follow"}, {"url": "https://github.com/anmolaman20/Tools_and_Agents", "content": "GitHub - anmolaman20/Tools_and_Agents: This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository serves as a comprehensive guide for building AI-powered agents using Langchain and Langgraph. It provides hands-on examples, practical tutorials, and resources for developers and AI enthusiasts to master building intelligent systems and workflows. AI Agent Development: Gain insights into creating intelligent systems that think, reason, and adapt in real time. This repository is ideal for AI practitioners, developers exploring language models, or anyone interested in building intelligent systems. This repository provides resources for building AI agents using Langchain and Langgraph."}]
 ================================== Ai Message ==================================
 
 Great idea! Building an autonomous agent with LangGraph is definitely an exciting project. Based on the latest information I've found, here are some insights and tips for building autonomous agents with LangGraph:
@@ -223,140 +177,11 @@ Building an autonomous agent is an iterative process, so be prepared to refine a
 Output is truncated. View as a scrollable element or open in a text editor. Adjust cell output settings...
 ```
 
-:::
-
-:::js
-
-```typescript
-import { randomUUID } from "node:crypto";
-const threadId = randomUUID();
-
-let iter = 0;
-
-for (const userInput of [
-  "I'm learning LangGraph. Could you do some research on it for me?",
-  "Ya that's helpful. Maybe I'll build an autonomous agent with it!",
-]) {
-  iter += 1;
-
-  console.log(`\n--- Conversation Turn ${iter} ---\n`);
-  const events = await graph.stream(
-    { messages: [{ role: "user", content: userInput }] },
-    { configurable: { thread_id: threadId }, streamMode: "values" }
-  );
-
-  for await (const event of events) {
-    if ("messages" in event) {
-      const lastMessage = event.messages.at(-1);
-
-      console.log(
-        "=".repeat(32),
-        `${lastMessage?.getType()} Message`,
-        "=".repeat(32)
-      );
-      console.log(lastMessage?.text);
-    }
-  }
-}
-```
-
-```
---- Conversation Turn 1 ---
-
-================================ human Message ================================
-I'm learning LangGraph.js. Could you do some research on it for me?
-================================ ai Message ================================
-I'll search for information about LangGraph.js for you.
-================================ tool Message ================================
-{
-  "query": "LangGraph.js framework TypeScript langchain what is it tutorial guide",
-  "follow_up_questions": null,
-  "answer": null,
-  "images": [],
-  "results": [
-    {
-      "url": "https://techcommunity.microsoft.com/blog/educatordeveloperblog/an-absolute-beginners-guide-to-langgraph-js/4212496",
-      "title": "An Absolute Beginner's Guide to LangGraph.js",
-      "content": "(...)",
-      "score": 0.79369855,
-      "raw_content": null
-    },
-    {
-      "url": "https://langchain-ai.github.io/langgraphjs/",
-      "title": "LangGraph.js",
-      "content": "(...)",
-      "score": 0.78154784,
-      "raw_content": null
-    }
-  ],
-  "response_time": 2.37
-}
-================================ ai Message ================================
-Let me provide you with an overview of LangGraph.js based on the search results:
-
-LangGraph.js is a JavaScript/TypeScript library that's part of the LangChain ecosystem, specifically designed for creating and managing complex LLM (Large Language Model) based workflows. Here are the key points about LangGraph.js:
-
-1. Purpose:
-- It's a low-level orchestration framework for building controllable agents
-- Particularly useful for creating agentic workflows where LLMs decide the course of action based on current state
-- Helps model workflows as graphs with nodes and edges
-
-(...)
-
---- Conversation Turn 2 ---
-
-================================ human Message ================================
-Ya that's helpful. Maybe I'll build an autonomous agent with it!
-================================ ai Message ================================
-Let me search for specific information about building autonomous agents with LangGraph.js.
-================================ tool Message ================================
-{
-  "query": "how to build autonomous agents with LangGraph.js examples tutorial react agent",
-  "follow_up_questions": null,
-  "answer": null,
-  "images": [],
-  "results": [
-    {
-      "url": "https://ai.google.dev/gemini-api/docs/langgraph-example",
-      "title": "ReAct agent from scratch with Gemini 2.5 and LangGraph",
-      "content": "(...)",
-      "score": 0.7602419,
-      "raw_content": null
-    },
-    {
-      "url": "https://www.youtube.com/watch?v=ZfjaIshGkmk",
-      "title": "Build Autonomous AI Agents with ReAct and LangGraph Tools",
-      "content": "(...)",
-      "score": 0.7471924,
-      "raw_content": null
-    }
-  ],
-  "response_time": 1.98
-}
-================================ ai Message ================================
-Based on the search results, I can provide you with a practical overview of how to build an autonomous agent with LangGraph.js. Here's what you need to know:
-
-1. Basic Structure for Building an Agent:
-- LangGraph.js provides a ReAct (Reason + Act) pattern implementation
-- The basic components include:
-  - State management for conversation history
-  - Nodes for different actions
-  - Edges for decision-making flow
-  - Tools for specific functionalities
-
-(...)
-
-```
-
-:::
-
 ## 3. Replay the full state history
 
 Now that you have added steps to the chatbot, you can `replay` the full state history to see everything that occurred.
 
-:::python
-
-```python
+``` python
 to_replay = None
 for state in graph.get_state_history(config):
     print("Num Messages: ", len(state.values["messages"]), "Next: ", state.next)
@@ -389,61 +214,10 @@ Num Messages:  0 Next:  ('__start__',)
 --------------------------------------------------------------------------------
 ```
 
-:::
-
-:::js
-
-```typescript
-import type { StateSnapshot } from "@langchain/langgraph";
-
-let toReplay: StateSnapshot | undefined;
-for await (const state of graph.getStateHistory({
-  configurable: { thread_id: threadId },
-})) {
-  console.log(
-    `Num Messages: ${state.values.messages.length}, Next: ${JSON.stringify(
-      state.next
-    )}`
-  );
-  console.log("-".repeat(80));
-  if (state.values.messages.length === 6) {
-    // We are somewhat arbitrarily selecting a specific state based on the number of chat messages in the state.
-    toReplay = state;
-  }
-}
-```
-
-```
-Num Messages: 8, Next: []
---------------------------------------------------------------------------------
-Num Messages: 7, Next: ["chatbot"]
---------------------------------------------------------------------------------
-Num Messages: 6, Next: ["tools"]
---------------------------------------------------------------------------------
-Num Messages: 5, Next: ["chatbot"]
---------------------------------------------------------------------------------
-Num Messages: 4, Next: ["__start__"]
---------------------------------------------------------------------------------
-Num Messages: 4, Next: []
---------------------------------------------------------------------------------
-Num Messages: 3, Next: ["chatbot"]
---------------------------------------------------------------------------------
-Num Messages: 2, Next: ["tools"]
---------------------------------------------------------------------------------
-Num Messages: 1, Next: ["chatbot"]
---------------------------------------------------------------------------------
-Num Messages: 0, Next: ["__start__"]
---------------------------------------------------------------------------------
-```
-
-:::
-
-Checkpoints are saved for every step of the graph. This **spans invocations** so you can rewind across a full thread's history.
+Checkpoints are saved for every step of the graph. This __spans invocations__ so you can rewind across a full thread's history.
 
 ## Resume from a checkpoint
 
-:::python
-
 Resume from the `to_replay` state, which is after the `chatbot` node in the second graph invocation. Resuming from this point will call the **action** node next.
 
 ```python
@@ -456,37 +230,12 @@ print(to_replay.config)
 {'configurable': {'thread_id': '1', 'checkpoint_ns': '', 'checkpoint_id': '1efd43e3-0c1f-6c4e-8006-891877d65740'}}
 ```
 
-:::
-
-:::js
-
-Resume from the `toReplay` state, which is after the `chatbot` node in one of the graph invocations. Resuming from this point will call the next scheduled node.
-
-```typescript
-console.log(toReplay.next);
-console.log(toReplay.config);
-```
-
-```
-["tools"]
-{
-  configurable: {
-    thread_id: "007708b8-ea9b-4ff7-a7ad-3843364dbf75",
-    checkpoint_ns: "",
-    checkpoint_id: "1efd43e3-0c1f-6c4e-8006-891877d65740"
-  }
-}
-```
-
-:::
-
 ## 4. Load a state from a moment-in-time
 
-:::python
-
 The checkpoint's `to_replay.config` contains a `checkpoint_id` timestamp. Providing this `checkpoint_id` value tells LangGraph's checkpointer to **load** the state from that moment in time.
 
-```python
+
+``` python
 # The `checkpoint_id` in the `to_replay.config` corresponds to a state we've persisted to our checkpointer.
 for event in graph.stream(None, to_replay.config, stream_mode="values"):
     if "messages" in event:
@@ -505,16 +254,19 @@ Tool Calls:
 ================================= Tool Message =================================
 Name: tavily_search_results_json
 
-[{"url": "https://towardsdatascience.com/building-autonomous-multi-tool-agents-with-gemini-2-0-and-langgraph-ad3d7bd5e79d", "content": "Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph | by Youness Mansar | Jan, 2025 | Towards Data Science Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph A practical tutorial with full code examples for building and running multi-tool agents Towards Data Science LLMs are remarkable — they can memorize vast amounts of information, answer general knowledge questions, write code, generate stories, and even fix your grammar. In this tutorial, we are going to build a simple LLM agent that is equipped with four tools that it can use to answer a user's question. This Agent will have the following specifications: Follow Published in Towards Data Science --------------------------------- Your home for data science and AI. Follow Follow Follow"}, {"url": "https://github.com/anmolaman20/Tools_and_Agents", "content": "GitHub - anmolaman20/Tools_and_Agents: This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository serves as a comprehensive guide for building AI-powered agents using Langchain and Langgraph. It provides hands-on examples, practical tutorials, and resources for developers and AI enthusiasts to master building intelligent systems and workflows. AI Agent Development: Gain insights into creating intelligent systems that think, reason, and adapt in real time. This repository is ideal for AI practitioners, developers exploring language models, or anyone interested in building intelligent systems. This repository provides resources for building AI agents using Langchain and Langgraph."}]
+[{"url": "https://towardsdatascience.com/building-autonomous-multi-tool-agents-with-gemini-2-0-and-langgraph-ad3d7bd5e79d", "content": "Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph | by Youness Mansar | Jan, 2025 | Towards Data Science Building Autonomous Multi-Tool Agents with Gemini 2.0 and LangGraph A practical tutorial with full code examples for building and running multi-tool agents Towards Data Science LLMs are remarkable — they can memorize vast amounts of information, answer general knowledge questions, write code, generate stories, and even fix your grammar. In this tutorial, we are going to build a simple LLM agent that is equipped with four tools that it can use to answer a user’s question. This Agent will have the following specifications: Follow Published in Towards Data Science --------------------------------- Your home for data science and AI. Follow Follow Follow"}, {"url": "https://github.com/anmolaman20/Tools_and_Agents", "content": "GitHub - anmolaman20/Tools_and_Agents: This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository provides resources for building AI agents using Langchain and Langgraph. This repository serves as a comprehensive guide for building AI-powered agents using Langchain and Langgraph. It provides hands-on examples, practical tutorials, and resources for developers and AI enthusiasts to master building intelligent systems and workflows. AI Agent Development: Gain insights into creating intelligent systems that think, reason, and adapt in real time. This repository is ideal for AI practitioners, developers exploring language models, or anyone interested in building intelligent systems. This repository provides resources for building AI agents using Langchain and Langgraph."}]
 ================================== Ai Message ==================================
 
-Great idea! Building an autonomous agent with LangGraph is definitely an exciting project. Based on the latest information I've found, here are some insights and tips for building autonomous agents with LangGraph:
+Great idea! Building an autonomous agent with LangGraph is indeed an excellent way to apply and deepen your understanding of the technology. Based on the search results, I can provide you with some insights and resources to help you get started:
 
-1. Multi-Tool Agents: LangGraph is particularly well-suited for creating autonomous agents that can use multiple tools. This allows your agent to have a diverse set of capabilities and choose the right tool for each task.
+1. Multi-Tool Agents:
+   LangGraph is well-suited for building autonomous agents that can use multiple tools. This allows your agent to have a variety of capabilities and choose the appropriate tool based on the task at hand.
 
-2. Integration with Large Language Models (LLMs): You can combine LangGraph with powerful LLMs like Gemini 2.0 to create more intelligent and capable agents. The LLM can serve as the "brain" of your agent, making decisions and generating responses.
+2. Integration with Large Language Models (LLMs):
+   There's a tutorial that specifically mentions using Gemini 2.0 (Google's LLM) with LangGraph to build autonomous agents. This suggests that LangGraph can be integrated with various LLMs, giving you flexibility in choosing the language model that best fits your needs.
 
-3. Workflow Management: LangGraph excels at managing complex, multi-step AI workflows. This is crucial for autonomous agents that need to break down tasks into smaller steps and execute them in the right order.
+3. Practical Tutorials:
+   There are tutorials available that provide full code examples for building and running multi-tool agents. These can be invaluable as you start your project, giving you a concrete starting point and demonstrating best practices.
 ...
 
 Remember, building an autonomous agent is an iterative process. Start simple and gradually increase complexity as you become more comfortable with LangGraph and its capabilities.
@@ -523,83 +275,7 @@ Would you like more information on any specific aspect of building your autonomo
 Output is truncated. View as a scrollable element or open in a text editor. Adjust cell output settings...
 ```
 
-The graph resumed execution from the `tools` node. You can tell this is the case since the first value printed above is the response from our search engine tool.
-:::
-
-:::js
-
-The checkpoint's `toReplay.config` contains a `checkpoint_id` timestamp. Providing this `checkpoint_id` value tells LangGraph's checkpointer to **load** the state from that moment in time.
-
-```typescript
-// The `checkpoint_id` in the `toReplay.config` corresponds to a state we've persisted to our checkpointer.
-for await (const event of await graph.stream(null, {
-  ...toReplay?.config,
-  streamMode: "values",
-})) {
-  if ("messages" in event) {
-    const lastMessage = event.messages.at(-1);
-
-    console.log(
-      "=".repeat(32),
-      `${lastMessage?.getType()} Message`,
-      "=".repeat(32)
-    );
-    console.log(lastMessage?.text);
-  }
-}
-```
-
-```
-================================ ai Message ================================
-Let me search for specific information about building autonomous agents with LangGraph.js.
-================================ tool Message ================================
-{
-  "query": "how to build autonomous agents with LangGraph.js examples tutorial",
-  "follow_up_questions": null,
-  "answer": null,
-  "images": [],
-  "results": [
-    {
-      "url": "https://www.mongodb.com/developer/languages/typescript/build-javascript-ai-agent-langgraphjs-mongodb/",
-      "title": "Build a JavaScript AI Agent With LangGraph.js and MongoDB",
-      "content": "(...)",
-      "score": 0.7672197,
-      "raw_content": null
-    },
-    {
-      "url": "https://medium.com/@lorevanoudenhove/how-to-build-ai-agents-with-langgraph-a-step-by-step-guide-5d84d9c7e832",
-      "title": "How to Build AI Agents with LangGraph: A Step-by-Step Guide",
-      "content": "(...)",
-      "score": 0.7407191,
-      "raw_content": null
-    }
-  ],
-  "response_time": 0.82
-}
-================================ ai Message ================================
-Based on the search results, I can share some practical information about building autonomous agents with LangGraph.js. Here are some concrete examples and approaches:
-
-1. Example HR Assistant Agent:
-- Can handle HR-related queries using employee information
-- Features include:
-  - Starting and continuing conversations
-  - Looking up information using vector search
-  - Persisting conversation state using checkpoints
-  - Managing threaded conversations
-
-2. Energy Savings Calculator Agent:
-- Functions as a lead generation tool for solar panel sales
-- Capabilities include:
-  - Calculating potential energy savings
-  - Handling multi-step conversations
-  - Processing user inputs for personalized estimates
-  - Managing conversation state
-
-(...)
-```
-
-The graph resumed execution from the `tools` node. You can tell this is the case since the first value printed above is the response from our search engine tool.
-:::
+The graph resumed execution from the `action` node. You can tell this is the case since the first value printed above is the response from our search engine tool.
 
 **Congratulations!** You've now used time-travel checkpoint traversal in LangGraph. Being able to rewind and explore alternative paths opens up a world of possibilities for debugging, experimentation, and interactive applications.
 
@@ -609,4 +285,4 @@ Take your LangGraph journey further by exploring deployment and advanced feature
 
 - **[LangGraph Server quickstart](../../tutorials/langgraph-platform/local-server.md)**: Launch a LangGraph server locally and interact with it using the REST API and LangGraph Studio Web UI.
 - **[LangGraph Platform quickstart](../../cloud/quick_start.md)**: Deploy your LangGraph app using LangGraph Platform.
-- **[LangGraph Platform concepts](../../concepts/langgraph_platform.md)**: Understand the foundational concepts of the LangGraph Platform.
+- **[LangGraph Platform concepts](../../concepts/langgraph_platform.md)**: Understand the foundational concepts of the LangGraph Platform.

docs/docs/tutorials/langgraph-platform/local-server.md

@@ -1,4 +1,4 @@
-# LangGraph Platform quickstart
+# Run a local server
 
 This guide shows you how to run a LangGraph application locally.
 

docs/mkdocs.yml

@@ -92,38 +92,75 @@ nav:
   - Get started:
     - index.md
     - Quickstarts:
-      - Agent: agents/agents.md
-      - LangGraph basics:
+      - Start with a prebuilt agent: agents/agents.md
+      - Build a custom workflow:
           -  concepts/why-langgraph.md
-          -  Build a basic chatbot: tutorials/get-started/1-build-basic-chatbot.md
-          -  tutorials/get-started/2-add-tools.md
-          -  tutorials/get-started/3-add-memory.md
-          -  Add human-in-the-loop: tutorials/get-started/4-human-in-the-loop.md
-          -  tutorials/get-started/5-customize-state.md
-          -  tutorials/get-started/6-time-travel.md
-      - Local server: tutorials/langgraph-platform/local-server.md
-      - Deployment: cloud/quick_start.md
-    - General concepts:
-      - Common patterns:
-        - Agent architectures: concepts/agentic_concepts.md
-        - Workflows & agents: tutorials/workflows.md
-      - Agent development: agents/overview.md
-      - Workflow orchestration:
-        - Graph API: concepts/low_level.md
-        - Subgraphs: concepts/subgraphs.md
-        - Runtime: concepts/pregel.md
-        - Functional API: concepts/functional_api.md
+          -  1. Build a basic chatbot: tutorials/get-started/1-build-basic-chatbot.md
+          -  2. Add tools: tutorials/get-started/2-add-tools.md
+          -  3. Add memory: tutorials/get-started/3-add-memory.md
+          -  4. Add human-in-the-loop: tutorials/get-started/4-human-in-the-loop.md
+          -  5. Customize state: tutorials/get-started/5-customize-state.md
+          -  6. Time travel: tutorials/get-started/6-time-travel.md
+      - Run a local server: tutorials/langgraph-platform/local-server.md
+    - Agent development:
+      - Workflows & agents: tutorials/workflows.md
+      - Prebuilt components: agents/overview.md
+      - Run an agent: agents/run_agents.md
+      - Agent architectures: concepts/agentic_concepts.md
+
+  - Guides:
+    - LangGraph APIs:
+      - Graph API:
+          - Overview: concepts/low_level.md
+          - Use the Graph API: how-tos/graph-api.ipynb
+      - Functional API:
+          - Overview: concepts/functional_api.md
+          - Use the Functional API: how-tos/use-functional-api.md
+      - Runtime: concepts/pregel.md
     - Core capabilities:
-      - Streaming: concepts/streaming.md
-      - Persistence: concepts/persistence.md
-      - Durable execution: concepts/durable_execution.md
-      - Memory: concepts/memory.md
-      - Tools: concepts/tools.md
-      - Human-in-the-loop: concepts/human_in_the_loop.md
-      - Breakpoints: concepts/breakpoints.md
-      - Time travel: concepts/time-travel.md
-      - Multi-agent: concepts/multi_agent.md
-    - Platform capabilities:
+      - Streaming:
+          - Overview: concepts/streaming.md
+          - Stream outputs: how-tos/streaming.md
+          - Use Server API: cloud/how-tos/streaming.md
+      - Persistence:
+          - Overview: concepts/persistence.md
+      - Durable execution:
+          - Overview: concepts/durable_execution.md
+      - Memory:
+          - Overview: concepts/memory.md
+          - Add memory: how-tos/memory/add-memory.md
+      - Context:
+          - Add context: agents/context.md
+      - Models:
+          - Configure model: agents/models.md
+      - Tools:
+          - Overview: concepts/tools.md
+          - Call tools: how-tos/tool-calling.md
+      - Human-in-the-loop:
+          - Overview: concepts/human_in_the_loop.md
+          - Add human intervention: how-tos/human_in_the_loop/add-human-in-the-loop.md
+          - Use Server API: cloud/how-tos/add-human-in-the-loop.md
+      - Breakpoints:
+          - Overview: concepts/breakpoints.md
+          - Set breakpoints: how-tos/human_in_the_loop/breakpoints.md
+          - Use Server API: cloud/how-tos/human_in_the_loop_breakpoint.md
+      - Time travel:
+          - Overview: concepts/time-travel.md
+          - Use time travel: how-tos/human_in_the_loop/time-travel.md
+          - Use Server API: cloud/how-tos/human_in_the_loop_time_travel.md
+      - Subgraphs:
+          - Overview: concepts/subgraphs.md
+          - Use subgraphs: how-tos/subgraph.ipynb
+      - Multi-agent:
+          - Overview: concepts/multi_agent.md
+          - Prebuilt implementation: agents/multi-agent.md
+          - Custom implementation: how-tos/multi_agent.ipynb
+      - MCP:
+          - Use MCP: agents/mcp.md
+          - Server API: concepts/server-mcp.md
+      - Evaluation:
+          - Basic implementation: agents/evals.md
+    - Platform-only capabilities:
       - LangGraph Platform:
           - Overview: concepts/langgraph_platform.md
           - Components:
@@ -133,107 +170,72 @@ nav:
               - Data plane: concepts/langgraph_data_plane.md
               - Control plane: concepts/langgraph_control_plane.md
             - LangGraph CLI: concepts/langgraph_cli.md
-            - LangGraph Studio: concepts/langgraph_studio.md
+            - LangGraph Studio: 
+              - Overview: concepts/langgraph_studio.md
+              - Quickstart: cloud/how-tos/studio/quick_start.md
+              - cloud/how-tos/invoke_studio.md
+              - cloud/how-tos/studio/manage_assistants.md
+              - cloud/how-tos/threads_studio.md
+              - cloud/how-tos/iterate_graph_studio.md
+              - cloud/how-tos/studio/run_evals.md
+              - cloud/how-tos/clone_traces_studio.md
+              - cloud/how-tos/datasets_studio.md
             - LangGraph SDK: concepts/sdk.md
           - Plans & pricing: concepts/plans.md
           - Application structure: concepts/application_structure.md
           - Scalability & resilience: concepts/scalability_and_resilience.md
-      - Authentication & access control: concepts/auth.md
-      - Assistants: concepts/assistants.md
-      - Double-texting: concepts/double_texting.md
-      - Webhooks: cloud/concepts/webhooks.md
-      - Cron jobs: cloud/concepts/cron_jobs.md
-      - Deployment:
-        - Overview: concepts/deployment_options.md
-        - Deployment options:
-          - Cloud SaaS: concepts/langgraph_cloud.md
-          - Self-Hosted Data Plane: concepts/langgraph_self_hosted_data_plane.md
-          - Self-Hosted Control Plane: concepts/langgraph_self_hosted_control_plane.md
-          - Standalone Container: concepts/langgraph_standalone_container.md
-    
-  - Guides:
-    - LangGraph APIs:
-      - Use the Graph API: how-tos/graph-api.ipynb
-      - Use the Functional API: how-tos/use-functional-api.md
-    - Models:
-      - Configure model: agents/models.md
-    - Streaming:
-      - Stream outputs: how-tos/streaming.md
-      - Use Server API: cloud/how-tos/streaming.md
-    - Context:
-      - Add context: agents/context.md
-    - Memory:
-      - Add memory: how-tos/memory/add-memory.md
-    - Human-in-the-loop:
-      - how-tos/human_in_the_loop/add-human-in-the-loop.md
-      - Use Server API: cloud/how-tos/add-human-in-the-loop.md
-    - Time travel:
-      - how-tos/human_in_the_loop/time-travel.md
-      - Use Server API: cloud/how-tos/human_in_the_loop_time_travel.md
-    - Breakpoints:
-      - Set breakpoints: how-tos/human_in_the_loop/breakpoints.md
-      - Use Server API: cloud/how-tos/human_in_the_loop_breakpoint.md
-    - Tools:
-      - Call tools: how-tos/tool-calling.md
-    - Subgraphs:
-      - Use subgraphs: how-tos/subgraph.ipynb
-    - Multi-agent:
-      - Prebuilt implementation: agents/multi-agent.md
-      - Custom implementation: how-tos/multi_agent.ipynb
-    - MCP:
-      - Use MCP: agents/mcp.md
-      - Server API: concepts/server-mcp.md
-    - Evaluation:
-        - Basic implementation: agents/evals.md
-    - Deployment:
-      - Basic deployment: agents/deployment.md
-      - Set up your application:
-        - Use requirements.txt: cloud/deployment/setup.md
-        - Use pyproject.toml: cloud/deployment/setup_pyproject.md
-        - Use JavaScript: cloud/deployment/setup_javascript.md
-        - Use custom Docker: cloud/deployment/custom_docker.md
-        - Rebuild graph at runtime: cloud/deployment/graph_rebuild.md
-      - Deploy to production:
-         - Cloud SaaS: cloud/deployment/cloud.md
-         - Self-Hosted Data Plane: cloud/deployment/self_hosted_data_plane.md
-         - Self-Hosted Control Plane: cloud/deployment/self_hosted_control_plane.md
-         - Standalone Container: cloud/deployment/standalone_container.md
-    - Platform capabilities:
-      - LangGraph Studio:
-        - Quickstart: cloud/how-tos/studio/quick_start.md
-        - cloud/how-tos/invoke_studio.md
-        - cloud/how-tos/studio/manage_assistants.md
-        - cloud/how-tos/threads_studio.md
-        - cloud/how-tos/iterate_graph_studio.md
-        - cloud/how-tos/studio/run_evals.md
-        - cloud/how-tos/clone_traces_studio.md
-        - cloud/how-tos/datasets_studio.md
       - Authentication & access control:
-        - how-tos/auth/custom_auth.md
-        - how-tos/auth/openapi_security.md
+          - Overview: concepts/auth.md
+          - how-tos/auth/custom_auth.md
+          - how-tos/auth/openapi_security.md
       - Assistants:
-        - cloud/how-tos/configuration_cloud.md
-        - Threads: cloud/how-tos/use_threads.md
-        - Runs:
-          - cloud/how-tos/background_run.md
-          - cloud/how-tos/same-thread.md
+          - Overview: concepts/assistants.md
+          - cloud/how-tos/configuration_cloud.md
+          - Threads: cloud/how-tos/use_threads.md
+          - Runs:
+            - cloud/how-tos/background_run.md
+            - cloud/how-tos/same-thread.md
+            - cloud/how-tos/cron_jobs.md
+            - cloud/how-tos/stateless_runs.md
+            - cloud/how-tos/configurable_headers.md
+      - Double-texting: 
+          - Overview: concepts/double_texting.md
+          - cloud/how-tos/interrupt_concurrent.md
+          - cloud/how-tos/rollback_concurrent.md
+          - cloud/how-tos/reject_concurrent.md
+          - cloud/how-tos/enqueue_concurrent.md
+      - Webhooks:
+          - Overview: cloud/concepts/webhooks.md
+          - Use webhooks: cloud/how-tos/webhooks.md
+      - Cron jobs:
+          - Overview: cloud/concepts/cron_jobs.md
           - cloud/how-tos/cron_jobs.md
-          - cloud/how-tos/stateless_runs.md
-          - cloud/how-tos/configurable_headers.md
-      - Double-texting:
-        - cloud/how-tos/interrupt_concurrent.md
-        - cloud/how-tos/rollback_concurrent.md
-        - cloud/how-tos/reject_concurrent.md
-        - cloud/how-tos/enqueue_concurrent.md
-      - Webhooks: cloud/how-tos/webhooks.md
-      - Cron jobs: cloud/how-tos/cron_jobs.md
       - Server customization:
-        - how-tos/http/custom_lifespan.md
-        - how-tos/http/custom_middleware.md
-        - how-tos/http/custom_routes.md
+          - how-tos/http/custom_lifespan.md
+          - how-tos/http/custom_middleware.md
+          - how-tos/http/custom_routes.md
       - Data management:
         - Add semantic search: cloud/deployment/semantic_search.md
         - Add TTLs: how-tos/ttl/configure_ttl.md
+      - Deployment:
+          - Overview: concepts/deployment_options.md
+          - Quickstart: cloud/quick_start.md
+          - Set up your application:
+            - Use requirements.txt: cloud/deployment/setup.md
+            - Use pyproject.toml: cloud/deployment/setup_pyproject.md
+            - Use JavaScript: cloud/deployment/setup_javascript.md
+            - Use custom Docker: cloud/deployment/custom_docker.md
+            - Rebuild graph at runtime: cloud/deployment/graph_rebuild.md
+          - Deployment options:
+            - Cloud SaaS: concepts/langgraph_cloud.md
+            - Self-Hosted Data Plane: concepts/langgraph_self_hosted_data_plane.md
+            - Self-Hosted Control Plane: concepts/langgraph_self_hosted_control_plane.md
+            - Standalone Container: concepts/langgraph_standalone_container.md
+          - Deploy to production:
+            - Cloud SaaS: cloud/deployment/cloud.md
+            - Self-Hosted Data Plane: cloud/deployment/self_hosted_data_plane.md
+            - Self-Hosted Control Plane: cloud/deployment/self_hosted_control_plane.md
+            - Standalone Container: cloud/deployment/standalone_container.md
 
   - Reference:
     - reference/index.md
@@ -263,7 +265,6 @@ nav:
       - Environment variables: cloud/reference/env_var.md
 
   - Examples:
-    - agents/run_agents.md
     - Template applications: concepts/template_applications.md  # TODO: make tutorial
     - Agentic RAG: tutorials/rag/langgraph_agentic_rag.ipynb
     - Agent Supervisor: tutorials/multi_agent/agent_supervisor.ipynb
@@ -288,6 +289,7 @@ nav:
     - Case studies: adopters.md
     - concepts/faq.md
     - llms.txt: llms-txt-overview.md
+    - LangChain Forum: https://forum.langchain.com/
     - Troubleshooting:
         - Errors:
           - troubleshooting/errors/index.md

libs/checkpoint-postgres/pyproject.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-  "langgraph-checkpoint>=2.0.21",
+  "langgraph-checkpoint>=2.0.21,<3.0.0",
   "orjson>=3.10.1",
   "psycopg>=3.2.0",
   "psycopg-pool>=3.2.0",
@@ -23,15 +23,14 @@ Repository = "https://www.github.com/langchain-ai/langgraph"
 
 [dependency-groups]
 dev = [
-  "ruff",
+  "ruff>=0.12.0",
   "codespell",
-  "pytest",
+  "pytest>=8.0.0",
   "anyio",
   "pytest-asyncio",
   "pytest-mock",
-  "mypy",
-  "psycopg[binary]",
-  "langgraph-checkpoint",
+  "mypy>=1.15.0",
+  "psycopg[binary]>=3.2.2",
   "pytest-watcher",
 ]
 

libs/checkpoint-postgres/uv.lock

@@ -325,15 +325,15 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
-    { name = "numpy" },
-    { name = "pandas" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "numpy", specifier = ">=2" },
+    { name = "pandas", specifier = ">=2" },
     { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
-    { name = "pytest" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -351,7 +351,6 @@ dependencies = [
 dev = [
     { name = "anyio" },
     { name = "codespell" },
-    { name = "langgraph-checkpoint" },
     { name = "mypy" },
     { name = "psycopg", extra = ["binary"] },
     { name = "pytest" },
@@ -373,14 +372,13 @@ requires-dist = [
 dev = [
     { name = "anyio" },
     { name = "codespell" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
-    { name = "psycopg", extras = ["binary"] },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "psycopg", extras = ["binary"], specifier = ">=3.2.2" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
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 [[package]]

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

@@ -223,10 +223,9 @@ class AsyncSqliteStore(AsyncBatchedBaseStore, BaseSqliteStore):
         Yields:
             An SQLite cursor object.
         """
+        if not self.is_setup:
+            await self.setup()
         async with self.lock:
-            if not self.is_setup:
-                await self.setup()
-
             if transaction:
                 await self.conn.execute("BEGIN")
 

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

@@ -981,10 +981,9 @@ class SqliteStore(BaseSqliteStore, BaseStore):
         Args:
             transaction (bool): whether to use transaction for the DB operations
         """
+        if not self.is_setup:
+            self.setup()
         with self.lock:
-            if not self.is_setup:
-                self.setup()
-
             if transaction:
                 self.conn.execute("BEGIN")
 
@@ -1002,10 +1001,10 @@ class SqliteStore(BaseSqliteStore, BaseStore):
         This method creates the necessary tables in the SQLite database if they don't
         already exist and runs database migrations. It should be called before first use.
         """
-        if self.is_setup:
-            return
 
         with self.lock:
+            if self.is_setup:
+                return
             # Create migrations table if it doesn't exist
             self.conn.executescript(
                 """

libs/checkpoint-sqlite/pyproject.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=2.0.21",
+    "langgraph-checkpoint>=2.0.21,<3.0.0",
     "aiosqlite>=0.20",
     "sqlite-vec>=0.1.6",
 ]
@@ -22,14 +22,13 @@ Repository = "https://www.github.com/langchain-ai/langgraph"
 
 [dependency-groups]
 dev = [
-  "ruff",
+  "ruff>=0.12.0",
   "codespell",
-  "pytest",
+  "pytest>=8.0.0",
   "pytest-asyncio",
   "pytest-mock",
   "pytest-watcher",
-  "mypy",
-  "langgraph-checkpoint",
+  "mypy>=1.15.0",
   "pytest-retry>=1.7.0",
 ]
 

libs/checkpoint-sqlite/uv.lock

@@ -337,15 +337,15 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
-    { name = "numpy" },
-    { name = "pandas" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "numpy", specifier = ">=2" },
+    { name = "pandas", specifier = ">=2" },
     { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
-    { name = "pytest" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -361,7 +361,6 @@ dependencies = [
 [package.dev-dependencies]
 dev = [
     { name = "codespell" },
-    { name = "langgraph-checkpoint" },
     { name = "mypy" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
@@ -381,14 +380,13 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "codespell" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-retry", specifier = ">=1.7.0" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
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 [[package]]

libs/checkpoint/pyproject.toml

@@ -21,16 +21,16 @@ Repository = "https://www.github.com/langchain-ai/langgraph"
 
 [dependency-groups]
 dev = [
-  "ruff",
+  "ruff>=0.12.0",
   "codespell",
-  "pytest",
+  "pytest>=8.0.0",
   "pytest-asyncio",
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-  "mypy",
+  "mypy>=1.15.0",
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-  "numpy",
-  "pandas",
+  "numpy>=2",
+  "pandas>=2",
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 ]
 

libs/checkpoint/uv.lock

@@ -2,8 +2,7 @@ version = 1
 revision = 2
 requires-python = ">=3.9"
 resolution-markers = [
-    "python_full_version >= '3.12.4'",
-    "python_full_version >= '3.12' and python_full_version < '3.12.4'",
+    "python_full_version >= '3.12'",
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     "python_full_version == '3.10.*'",
     "python_full_version < '3.10'",
@@ -35,11 +34,11 @@ wheels = [
 
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 [[package]]
@@ -306,7 +305,7 @@ wheels = [
 
 [[package]]
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-version = "0.3.60"
+version = "0.3.67"
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     { name = "tenacity" },
     { name = "typing-extensions" },
 ]
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-    { name = "numpy", version = "2.3.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
+    { name = "numpy", version = "2.3.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.11'" },
     { name = "pandas" },
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-    { name = "pandas-stubs", version = "2.2.3.250527", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
+    { name = "pandas-stubs", version = "2.3.0.250702", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.10'" },
     { name = "pytest" },
     { name = "pytest-asyncio" },
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@@ -359,20 +358,20 @@ requires-dist = [
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     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
-    { name = "numpy" },
-    { name = "pandas" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "numpy", specifier = ">=2" },
+    { name = "pandas", specifier = ">=2" },
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 [[package]]

libs/cli/examples/graphs/storm.py

@@ -285,7 +285,7 @@ class AnswerWithCitations(BaseModel):
     @property
     def as_str(self) -> str:
         return f"{self.answer}\n\nCitations:\n\n" + "\n".join(
-            f"[{i+1}]: {url}" for i, url in enumerate(self.cited_urls)
+            f"[{i + 1}]: {url}" for i, url in enumerate(self.cited_urls)
         )
 
 
@@ -553,7 +553,7 @@ async def conduct_interviews(state: ResearchState):
 def format_conversation(interview_state):
     messages = interview_state["messages"]
     convo = "\n".join(f"{m.name}: {m.content}" for m in messages)
-    return f'Conversation with {interview_state["editor"].name}\n\n' + convo
+    return f"Conversation with {interview_state['editor'].name}\n\n" + convo
 
 
 async def refine_outline(state: ResearchState):

libs/cli/langgraph_cli/cli.py

@@ -208,7 +208,7 @@ def up(
 ):
     click.secho("Starting LangGraph API server...", fg="green")
     click.secho(
-        """For local dev, requires env var LANGSMITH_API_KEY with access to LangGraph Platform closed beta.
+        """For local dev, requires env var LANGSMITH_API_KEY with access to LangGraph Platform.
 For production use, requires a license key in env var LANGGRAPH_CLOUD_LICENSE_KEY.""",
     )
     with Runner() as runner, Progress(message="Pulling...") as set:

libs/cli/langgraph_cli/config.py

@@ -602,8 +602,7 @@ def validate_config(config: Config) -> Config:
 
     if not config["graphs"]:
         raise click.UsageError(
-            "No graphs found in config. "
-            "Add at least one graph to 'graphs' dictionary."
+            "No graphs found in config. Add at least one graph to 'graphs' dictionary."
         )
 
     # Validate image_distro config
@@ -1181,7 +1180,7 @@ def python_config_to_docker(
             )
             for reqpath, destpath in local_deps.pip_reqs
         )
-        pip_reqs_str += f'{os.linesep}RUN {pip_install} {" ".join("-r " + r for _,r in local_deps.pip_reqs)}'
+        pip_reqs_str += f"{os.linesep}RUN {pip_install} {' '.join('-r ' + r for _, r in local_deps.pip_reqs)}"
         pip_reqs_str = f"""# -- Installing local requirements --
 {pip_reqs_str}
 # -- End of local requirements install --"""

libs/cli/langgraph_cli/templates.py

@@ -123,7 +123,7 @@ def _download_repo_with_requests(repo_url: str, path: str) -> None:
                 )
     except error.HTTPError as e:
         click.secho(
-            f"❌ Error: Failed to download repository.\n" f"Details: {e}\n",
+            f"❌ Error: Failed to download repository.\nDetails: {e}\n",
             fg="red",
             bold=True,
             err=True,

libs/cli/pyproject.toml

@@ -18,8 +18,8 @@ dependencies = [
 
 [project.optional-dependencies]
 inmem = [
-    "langgraph-api>=0.2.67 ; python_version >= '3.11'",
-    "langgraph-runtime-inmem>=0.3.0 ; python_version >= '3.11'",
+    "langgraph-api>=0.2.67,<0.3.0 ; python_version >= '3.11'",
+    "langgraph-runtime-inmem>=0.3.0,<0.4.0 ; python_version >= '3.11'",
     "python-dotenv>=0.8.0",
 ]
 
@@ -31,13 +31,13 @@ langgraph = "langgraph_cli.cli:cli"
 
 [dependency-groups]
 dev = [
-    "ruff",
+    "ruff>=0.12.0",
     "codespell",
-    "pytest",
+    "pytest>=8.0.0",
     "pytest-asyncio",
     "pytest-mock",
     "pytest-watch",
-    "mypy",
+    "mypy>=1.15.0",
     "msgspec",
 ]
 

libs/cli/tests/unit_tests/cli/test_cli.py

@@ -280,9 +280,9 @@ def test_version_option() -> None:
     assert result.exit_code == 0, "Expected exit code 0 for --version option"
 
     # Check that the output contains the correct version information
-    assert (
-        "LangGraph CLI, version" in result.output
-    ), "Expected version information in output"
+    assert "LangGraph CLI, version" in result.output, (
+        "Expected version information in output"
+    )
 
 
 def test_dockerfile_command_basic() -> None:
@@ -570,6 +570,6 @@ def test_build_generate_proper_build_context():
         build_context_pattern = re.compile(r"--build-context\s+(\w+)=([^\s]+)")
 
         build_contexts = re.findall(build_context_pattern, result.output)
-        assert (
-            len(build_contexts) == 2
-        ), f"Expected 2 build contexts, but found {len(build_contexts)}"
+        assert len(build_contexts) == 2, (
+            f"Expected 2 build contexts, but found {len(build_contexts)}"
+        )

libs/cli/tests/unit_tests/cli/test_templates.py

@@ -42,18 +42,18 @@ def test_create_new_with_mocked_download(mock_urlopen: MagicMock) -> None:
 
         # Verify CLI command execution and success
         assert result.exit_code == 0, result.output
-        assert (
-            "New project created" in result.output
-        ), "Expected success message in output."
+        assert "New project created" in result.output, (
+            "Expected success message in output."
+        )
 
         # Verify that the directory is not empty
         assert os.listdir(temp_dir), "Expected files to be created in temp directory."
 
         # Check for a known file in the extracted content
         extracted_files = [f.name for f in Path(temp_dir).glob("*")]
-        assert (
-            "test-file.txt" in extracted_files
-        ), "Expected 'test-file.txt' in the extracted content."
+        assert "test-file.txt" in extracted_files, (
+            "Expected 'test-file.txt' in the extracted content."
+        )
 
 
 def test_invalid_template_id() -> None:
@@ -65,6 +65,6 @@ def test_invalid_template_id() -> None:
 
     # Verify the command failed and proper message is displayed
     assert result.exit_code != 0, "Expected non-zero exit code for invalid template."
-    assert (
-        "Template 'invalid-template-id' not found" in result.output
-    ), "Expected error message in output."
+    assert "Template 'invalid-template-id' not found" in result.output, (
+        "Expected error message in output."
+    )

libs/cli/uv.lock

@@ -530,8 +530,8 @@ dev = [
 [package.metadata]
 requires-dist = [
     { name = "click", specifier = ">=8.1.7" },
-    { name = "langgraph-api", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.2.67" },
-    { name = "langgraph-runtime-inmem", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.3.0" },
+    { name = "langgraph-api", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.2.67,<0.3.0" },
+    { name = "langgraph-runtime-inmem", marker = "python_full_version >= '3.11' and extra == 'inmem'", specifier = ">=0.3.0,<0.4.0" },
     { name = "langgraph-sdk", marker = "python_full_version >= '3.11'", specifier = ">=0.1.0" },
     { name = "python-dotenv", marker = "extra == 'inmem'", specifier = ">=0.8.0" },
 ]
@@ -541,12 +541,12 @@ provides-extras = ["inmem"]
 dev = [
     { name = "codespell" },
     { name = "msgspec" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watch" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
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+version = "2.19.2"
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+
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 version = "2.10.1"
@@ -995,7 +1004,7 @@ wheels = [
 
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+version = "8.4.1"
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@@ -1003,11 +1012,12 @@ dependencies = [
     { name = "iniconfig" },
     { name = "packaging" },
     { name = "pluggy" },
+    { name = "pygments" },
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 [[package]]

libs/langgraph/README.md

@@ -63,7 +63,7 @@ LangGraph provides low-level supporting infrastructure for *any* long-running, s
 While LangGraph can be used standalone, it also integrates seamlessly with any LangChain product, giving developers a full suite of tools for building agents. To improve your LLM application development, pair LangGraph with:
 
 - [LangSmith](http://www.langchain.com/langsmith) — Helpful for agent evals and observability. Debug poor-performing LLM app runs, evaluate agent trajectories, gain visibility in production, and improve performance over time.
-- [LangGraph Platform](https://langchain-ai.github.io/langgraph/concepts/#langgraph-platform) — Deploy and scale agents effortlessly with a purpose-built deployment platform for long running, stateful workflows. Discover, reuse, configure, and share agents across teams — and iterate quickly with visual prototyping in [LangGraph Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio/).
+- [LangGraph Platform](https://langchain-ai.github.io/langgraph/concepts/langgraph_platform/) — Deploy and scale agents effortlessly with a purpose-built deployment platform for long running, stateful workflows. Discover, reuse, configure, and share agents across teams — and iterate quickly with visual prototyping in [LangGraph Studio](https://langchain-ai.github.io/langgraph/concepts/langgraph_studio/).
 - [LangChain](https://python.langchain.com/docs/introduction/) – Provides integrations and composable components to streamline LLM application development.
 
 > [!NOTE]

libs/langgraph/langgraph/func/__init__.py

@@ -17,6 +17,7 @@ from typing import (
     overload,
 )
 
+# meaningless change to trigger tests
 from typing_extensions import Unpack
 
 from langgraph._typing import UNSET, DeprecatedKwargs

libs/langgraph/pyproject.toml

@@ -13,11 +13,12 @@ license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
     "langchain-core>=0.1",
-    "langgraph-checkpoint>=2.1.0",
-    "langgraph-sdk>=0.1.42",
-    "langgraph-prebuilt>=0.5.0",
+    "langgraph-checkpoint>=2.1.0,<3.0.0",
+    "langgraph-sdk>=0.1.42,<0.2.0",
+    "langgraph-prebuilt>=0.5.0,<0.6.0",
     "xxhash>=3.5.0",
-    "pydantic>=2.7.4",
+    "pydantic>=2.7.4; python_version < '3.13'",
+    "pydantic>=2..0; python_version >= '3.13'",
 ]
 
 [project.urls]
@@ -25,30 +26,27 @@ Repository = "https://www.github.com/langchain-ai/langgraph"
 
 [dependency-groups]
 dev = [
-    "pytest",
-    "pytest-cov",
-    "pytest-dotenv",
-    "pytest-mock",
-    "syrupy",
-    "httpx",
-    "pytest-watcher",
-    "mypy",
-    "ruff",
-    "jupyter",
-    "pytest-xdist[psutil]",
-    "pytest-repeat",
-    "langgraph-prebuilt",
-    "langgraph-checkpoint",
+    "pytest>=8.3.2",
+    "pytest-cov>=4.0.0",
+    "pytest-dotenv>=0.5.2",
+    "pytest-mock>=3.10.0",
+    "syrupy>=4.0.2",
+    "httpx>=0.26.0",
+    'pytest-watcher>=0.4.1',
+    "mypy>=1.6.0",
+    "ruff>=0.6.2",
+    "jupyter>=1.0.0",
+    "pytest-xdist[psutil]>=3.6.1",
+    "pytest-repeat>=0.9.3",
     "langgraph-checkpoint-sqlite",
     "langgraph-checkpoint-postgres",
-    "langgraph-sdk",
-    "psycopg[binary]",
+    'psycopg[binary]>=3.2.2; python_version >= "3.10"',
     "uvloop==0.21.0beta1",
-    "pyperf",
-    "py-spy",
-    "types-requests",
-    "pycryptodome",
-    "langgraph-cli[inmem]",
+    "pyperf>=2.7.0",
+    "py-spy>=0.3.14",
+    "types-requests>=2.32.0.20240914",
+    "pycryptodome>=3.21.0",
+    "langgraph-cli[inmem]>=0.2.8",
 ]
 
 [tool.uv]

libs/langgraph/uv.lock

@@ -1183,7 +1183,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "0.3.63"
+version = "0.3.67"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -1194,9 +1194,9 @@ dependencies = [
     { name = "tenacity" },
     { name = "typing-extensions" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/c2/40/875af0194024d0006874f061958fa417d3500bbfdc9a57e1bd1c2f4e6ed2/langchain_core-0.3.67.tar.gz", hash = "sha256:2c14aa44a0e78e014e96d7f2f8916ac109d0a0ba87ed67ee25bf7296bed7e7ba", size = 561952, upload-time = "2025-06-30T17:09:35.142Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/9f/2b/a0d283089c6d08c12d47dca39a55029ff714e939ec04f4560420426ab613/langchain_core-0.3.67-py3-none-any.whl", hash = "sha256:b699f1f24b24fa2747c05e2daa280aa64478a51e01a4e82c7f8e20b6167dfa99", size = 440237, upload-time = "2025-06-30T17:09:33.323Z" },
 ]
 
 [[package]]
@@ -1216,14 +1216,11 @@ dependencies = [
 dev = [
     { name = "httpx" },
     { name = "jupyter" },
-    { name = "langgraph-checkpoint" },
     { name = "langgraph-checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite" },
     { name = "langgraph-cli", extra = ["inmem"] },
-    { name = "langgraph-prebuilt" },
-    { name = "langgraph-sdk" },
     { name = "mypy" },
-    { name = "psycopg", extra = ["binary"] },
+    { name = "psycopg", extra = ["binary"], marker = "python_full_version >= '3.10'" },
     { name = "py-spy" },
     { name = "pycryptodome" },
     { name = "pyperf" },
@@ -1252,29 +1249,26 @@ requires-dist = [
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "httpx" },
-    { name = "jupyter" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
+    { name = "httpx", specifier = ">=0.26.0" },
+    { name = "jupyter", specifier = ">=1.0.0" },
     { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "langgraph-cli", extras = ["inmem"] },
-    { name = "langgraph-prebuilt", editable = "../prebuilt" },
-    { name = "langgraph-sdk", editable = "../sdk-py" },
-    { name = "mypy" },
-    { name = "psycopg", extras = ["binary"] },
-    { name = "py-spy" },
-    { name = "pycryptodome" },
-    { name = "pyperf" },
-    { name = "pytest" },
-    { name = "pytest-cov" },
-    { name = "pytest-dotenv" },
-    { name = "pytest-mock" },
-    { name = "pytest-repeat" },
-    { name = "pytest-watcher" },
-    { name = "pytest-xdist", extras = ["psutil"] },
-    { name = "ruff" },
-    { name = "syrupy" },
-    { name = "types-requests" },
+    { name = "langgraph-cli", extras = ["inmem"], specifier = ">=0.2.8" },
+    { name = "mypy", specifier = ">=1.6.0" },
+    { name = "psycopg", extras = ["binary"], marker = "python_full_version >= '3.10'", specifier = ">=3.2.2" },
+    { name = "py-spy", specifier = ">=0.3.14" },
+    { name = "pycryptodome", specifier = ">=3.21.0" },
+    { name = "pyperf", specifier = ">=2.7.0" },
+    { name = "pytest", specifier = ">=8.3.2" },
+    { name = "pytest-cov", specifier = ">=4.0.0" },
+    { name = "pytest-dotenv", specifier = ">=0.5.2" },
+    { name = "pytest-mock", specifier = ">=3.10.0" },
+    { name = "pytest-repeat", specifier = ">=0.9.3" },
+    { name = "pytest-watcher", specifier = ">=0.4.1" },
+    { name = "pytest-xdist", extras = ["psutil"], specifier = ">=3.6.1" },
+    { name = "ruff", specifier = ">=0.6.2" },
+    { name = "syrupy", specifier = ">=4.0.2" },
+    { name = "types-requests", specifier = ">=2.32.0.20240914" },
     { name = "uvloop", specifier = "==0.21.0b1" },
 ]
 
@@ -1327,15 +1321,15 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
-    { name = "numpy" },
-    { name = "pandas" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "numpy", specifier = ">=2" },
+    { name = "pandas", specifier = ">=2" },
     { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
-    { name = "pytest" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -1361,14 +1355,13 @@ requires-dist = [
 dev = [
     { name = "anyio" },
     { name = "codespell" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
-    { name = "psycopg", extras = ["binary"] },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "psycopg", extras = ["binary"], specifier = ">=3.2.2" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -1391,14 +1384,13 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "codespell" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-retry", specifier = ">=1.7.0" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -1423,7 +1415,7 @@ inmem = [
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "0.5.1"
+version = "0.5.2"
 source = { editable = "../prebuilt" }
 dependencies = [
     { name = "langchain-core" },
@@ -1432,7 +1424,7 @@ dependencies = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.3.22" },
+    { name = "langchain-core", specifier = ">=0.3.67" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
 ]
 
@@ -1440,15 +1432,14 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "langgraph", editable = "." },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
     { name = "syrupy" },
 ]
 
@@ -1487,17 +1478,17 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "codespell" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watch" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
 name = "langsmith"
-version = "0.3.43"
+version = "0.4.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
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@@ -1508,9 +1499,9 @@ dependencies = [
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     { name = "zstandard" },
 ]
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+sdist = { url = "https://files.pythonhosted.org/packages/20/c8/8d2e0fc438d2d3d8d4300f7684ea30a754344ed00d7ba9cc2705241d2a5f/langsmith-0.4.4.tar.gz", hash = "sha256:70c53bbff24a7872e88e6fa0af98270f4986a6e364f9e85db1cc5636defa4d66", size = 352105, upload-time = "2025-06-27T19:20:36.207Z" }
 wheels = [
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+    { url = "https://files.pythonhosted.org/packages/1d/33/a3337eb70d795495a299a1640d7a75f17fb917155a64309b96106e7b9452/langsmith-0.4.4-py3-none-any.whl", hash = "sha256:014c68329bd085bd6c770a6405c61bb6881f82eb554ce8c4d1984b0035fd1716", size = 367687, upload-time = "2025-06-27T19:20:33.839Z" },
 ]
 
 [[package]]
@@ -2005,7 +1996,7 @@ wheels = [
 
 [package.optional-dependencies]
 binary = [
-    { name = "psycopg-binary", marker = "implementation_name != 'pypy'" },
+    { name = "psycopg-binary", marker = "python_full_version >= '3.10' and implementation_name != 'pypy'" },
 ]
 
 [[package]]

libs/prebuilt/langgraph/prebuilt/tool_node.py

@@ -30,7 +30,10 @@ from langchain_core.runnables.config import (
 )
 from langchain_core.tools import BaseTool, InjectedToolArg
 from langchain_core.tools import tool as create_tool
-from langchain_core.tools.base import get_all_basemodel_annotations
+from langchain_core.tools.base import (
+    TOOL_MESSAGE_BLOCK_TYPES,
+    get_all_basemodel_annotations,
+)
 from pydantic import BaseModel
 from typing_extensions import Annotated, get_args, get_origin
 
@@ -46,12 +49,11 @@ TOOL_CALL_ERROR_TEMPLATE = "Error: {error}\n Please fix your mistakes."
 
 
 def msg_content_output(output: Any) -> Union[str, list[dict]]:
-    recognized_content_block_types = ("image", "image_url", "text", "json")
     if isinstance(output, str):
         return output
     elif isinstance(output, list) and all(
         [
-            isinstance(x, dict) and x.get("type") in recognized_content_block_types
+            isinstance(x, dict) and x.get("type") in TOOL_MESSAGE_BLOCK_TYPES
             for x in output
         ]
     ):

libs/prebuilt/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "langgraph-prebuilt"
-version = "0.5.1"
+version = "0.5.2"
 description = "Library with high-level APIs for creating and executing LangGraph agents and tools."
 authors = []
 requires-python = ">=3.9"
@@ -12,8 +12,8 @@ readme = "README.md"
 license = "MIT"
 license-files = ['LICENSE']
 dependencies = [
-    "langgraph-checkpoint>=2.1.0",
-    "langchain-core>=0.3.22",
+    "langgraph-checkpoint>=2.1.0,<3.0.0",
+    "langchain-core>=0.3.67",
 ]
 
 [project.urls]
@@ -21,15 +21,14 @@ Repository = "https://www.github.com/langchain-ai/langgraph"
 
 [dependency-groups]
 dev = [
-    "ruff",
+    "ruff>=0.12.0",
     "codespell",
-    "pytest",
+    "pytest>=8.0.0",
     "pytest-asyncio",
     "pytest-mock",
     "pytest-watcher",
-    "mypy",
+    "mypy>=1.15.0",
     "langgraph",
-    "langgraph-checkpoint",
     "langgraph-checkpoint-sqlite",
     "langgraph-checkpoint-postgres",
     "syrupy",

libs/prebuilt/uv.lock

@@ -302,7 +302,7 @@ wheels = [
 
 [[package]]
 name = "langchain-core"
-version = "0.3.60"
+version = "0.3.67"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "jsonpatch" },
@@ -313,9 +313,9 @@ dependencies = [
     { name = "tenacity" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/5b/75/95129aaada92980a002a31e002610a80af3c8967ae7884710372e89cdde0/langchain_core-0.3.60.tar.gz", hash = "sha256:63dd1bdf7939816115399522661ca85a2f3686a61440f2f46ebd86d1b028595b", size = 557456, upload-time = "2025-05-15T15:23:23.642Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/c2/40/875af0194024d0006874f061958fa417d3500bbfdc9a57e1bd1c2f4e6ed2/langchain_core-0.3.67.tar.gz", hash = "sha256:2c14aa44a0e78e014e96d7f2f8916ac109d0a0ba87ed67ee25bf7296bed7e7ba", size = 561952, upload-time = "2025-06-30T17:09:35.142Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/2d/bc/344f5b11fdfe0e27f7064d2e829921a791461dc32e5ed285fe6325518c26/langchain_core-0.3.60-py3-none-any.whl", hash = "sha256:2ccdf06b12e699b1b0962bc02837056c075b4981c3d13f82a4d4c30bb22ea3dc", size = 437890, upload-time = "2025-05-15T15:23:22.278Z" },
+    { url = "https://files.pythonhosted.org/packages/9f/2b/a0d283089c6d08c12d47dca39a55029ff714e939ec04f4560420426ab613/langchain_core-0.3.67-py3-none-any.whl", hash = "sha256:b699f1f24b24fa2747c05e2daa280aa64478a51e01a4e82c7f8e20b6167dfa99", size = 440237, upload-time = "2025-06-30T17:09:33.323Z" },
 ]
 
 [[package]]
@@ -343,29 +343,26 @@ requires-dist = [
 
 [package.metadata.requires-dev]
 dev = [
-    { name = "httpx" },
-    { name = "jupyter" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
+    { name = "httpx", specifier = ">=0.26.0" },
+    { name = "jupyter", specifier = ">=1.0.0" },
     { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "langgraph-cli", extras = ["inmem"] },
-    { name = "langgraph-prebuilt", editable = "." },
-    { name = "langgraph-sdk", editable = "../sdk-py" },
-    { name = "mypy" },
-    { name = "psycopg", extras = ["binary"] },
-    { name = "py-spy" },
-    { name = "pycryptodome" },
-    { name = "pyperf" },
-    { name = "pytest" },
-    { name = "pytest-cov" },
-    { name = "pytest-dotenv" },
-    { name = "pytest-mock" },
-    { name = "pytest-repeat" },
-    { name = "pytest-watcher" },
-    { name = "pytest-xdist", extras = ["psutil"] },
-    { name = "ruff" },
-    { name = "syrupy" },
-    { name = "types-requests" },
+    { name = "langgraph-cli", extras = ["inmem"], specifier = ">=0.2.8" },
+    { name = "mypy", specifier = ">=1.6.0" },
+    { name = "psycopg", extras = ["binary"], marker = "python_full_version >= '3.10'", specifier = ">=3.2.2" },
+    { name = "py-spy", specifier = ">=0.3.14" },
+    { name = "pycryptodome", specifier = ">=3.21.0" },
+    { name = "pyperf", specifier = ">=2.7.0" },
+    { name = "pytest", specifier = ">=8.3.2" },
+    { name = "pytest-cov", specifier = ">=4.0.0" },
+    { name = "pytest-dotenv", specifier = ">=0.5.2" },
+    { name = "pytest-mock", specifier = ">=3.10.0" },
+    { name = "pytest-repeat", specifier = ">=0.9.3" },
+    { name = "pytest-watcher", specifier = ">=0.4.1" },
+    { name = "pytest-xdist", extras = ["psutil"], specifier = ">=3.6.1" },
+    { name = "ruff", specifier = ">=0.6.2" },
+    { name = "syrupy", specifier = ">=4.0.2" },
+    { name = "types-requests", specifier = ">=2.32.0.20240914" },
     { name = "uvloop", specifier = "==0.21.0b1" },
 ]
 
@@ -388,15 +385,15 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "dataclasses-json" },
-    { name = "mypy" },
-    { name = "numpy" },
-    { name = "pandas" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "numpy", specifier = ">=2" },
+    { name = "pandas", specifier = ">=2" },
     { name = "pandas-stubs", specifier = ">=2.2.2.240807" },
-    { name = "pytest" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -422,14 +419,13 @@ requires-dist = [
 dev = [
     { name = "anyio" },
     { name = "codespell" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
-    { name = "psycopg", extras = ["binary"] },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "psycopg", extras = ["binary"], specifier = ">=3.2.2" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -452,19 +448,18 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "codespell" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-retry", specifier = ">=1.7.0" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
 name = "langgraph-prebuilt"
-version = "0.5.1"
+version = "0.5.2"
 source = { editable = "." }
 dependencies = [
     { name = "langchain-core" },
@@ -475,7 +470,6 @@ dependencies = [
 dev = [
     { name = "codespell" },
     { name = "langgraph" },
-    { name = "langgraph-checkpoint" },
     { name = "langgraph-checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite" },
     { name = "mypy" },
@@ -489,7 +483,7 @@ dev = [
 
 [package.metadata]
 requires-dist = [
-    { name = "langchain-core", specifier = ">=0.3.22" },
+    { name = "langchain-core", specifier = ">=0.3.67" },
     { name = "langgraph-checkpoint", editable = "../checkpoint" },
 ]
 
@@ -497,15 +491,14 @@ requires-dist = [
 dev = [
     { name = "codespell" },
     { name = "langgraph", editable = "../langgraph" },
-    { name = "langgraph-checkpoint", editable = "../checkpoint" },
     { name = "langgraph-checkpoint-postgres", editable = "../checkpoint-postgres" },
     { name = "langgraph-checkpoint-sqlite", editable = "../checkpoint-sqlite" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watcher" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
     { name = "syrupy" },
 ]
 
@@ -527,17 +520,17 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "codespell" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watch" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
 name = "langsmith"
-version = "0.3.42"
+version = "0.4.4"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "httpx" },
@@ -548,9 +541,9 @@ dependencies = [
     { name = "requests-toolbelt" },
     { name = "zstandard" },
 ]
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 ]
 
 [[package]]

libs/sdk-js/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@langchain/langgraph-sdk",
-  "version": "0.0.86",
+  "version": "0.0.88",
   "description": "Client library for interacting with the LangGraph API",
   "type": "module",
   "packageManager": "yarn@1.22.19",
@@ -22,7 +22,9 @@
     "uuid": "^9.0.0"
   },
   "devDependencies": {
-    "@langchain/core": "^0.3.31",
+    "@langchain/langgraph-api": "~0.0.41",
+    "@langchain/core": "^0.3.61",
+    "@langchain/langgraph": "^0.3.5",
     "@langchain/scripts": "^0.1.4",
     "@testing-library/dom": "^10.4.0",
     "@testing-library/jest-dom": "^6.6.3",
@@ -35,6 +37,7 @@
     "@types/uuid": "^9.0.1",
     "@vitejs/plugin-react": "^4.4.1",
     "concat-md": "^0.5.1",
+    "hono": "^4.8.2",
     "jsdom": "^26.1.0",
     "msw": "^2.8.2",
     "prettier": "^3.2.5",

libs/sdk-js/src/client.ts

@@ -1014,8 +1014,8 @@ export class RunsClient<
     const stream: ReadableStream<{ event: any; data: any }> = (
       response.body || new ReadableStream({ start: (ctrl) => ctrl.close() })
     )
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     yield* IterableReadableStream.fromReadableStream(stream);
   }
@@ -1318,8 +1318,8 @@ export class RunsClient<
     const stream: ReadableStream<{ event: string; data: any }> = (
       response.body || new ReadableStream({ start: (ctrl) => ctrl.close() })
     )
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     yield* IterableReadableStream.fromReadableStream(stream);
   }
@@ -1658,7 +1658,30 @@ export class Client<
    */
   public "~ui": UiClient;
 
+  /**
+   * @internal Used to obtain a stable key representing the client.
+   */
+  private "~configHash": string | undefined;
+
   constructor(config?: ClientConfig) {
+    this["~configHash"] = (() =>
+      JSON.stringify({
+        apiUrl: config?.apiUrl,
+        apiKey: config?.apiKey,
+        timeoutMs: config?.timeoutMs,
+        defaultHeaders: config?.defaultHeaders,
+
+        maxConcurrency: config?.callerOptions?.maxConcurrency,
+        maxRetries: config?.callerOptions?.maxRetries,
+
+        callbacks: {
+          onFailedResponseHook:
+            config?.callerOptions?.onFailedResponseHook != null,
+          onRequest: config?.onRequest != null,
+          fetch: config?.callerOptions?.fetch != null,
+        },
+      }))();
+
     this.assistants = new AssistantsClient(config);
     this.threads = new ThreadsClient(config);
     this.runs = new RunsClient(config);
@@ -1667,3 +1690,10 @@ export class Client<
     this["~ui"] = new UiClient(config);
   }
 }
+
+/**
+ * @internal Used to obtain a stable key representing the client.
+ */
+export function getClientConfigHash(client: Client): string | undefined {
+  return client["~configHash"];
+}

libs/sdk-js/src/react/stream.tsx

@@ -1,7 +1,7 @@
 /* __LC_ALLOW_ENTRYPOINT_SIDE_EFFECTS__ */
 "use client";
 
-import { Client, type ClientConfig } from "../client.js";
+import { Client, getClientConfigHash, type ClientConfig } from "../client.js";
 import type {
   Command,
   DisconnectMode,
@@ -31,7 +31,7 @@ import type {
 } from "../types.stream.js";
 
 import {
-  type MutableRefObject,
+  type RefObject,
   useCallback,
   useEffect,
   useMemo,
@@ -316,16 +316,21 @@ function fetchHistory<StateType extends Record<string, unknown>>(
 function useThreadHistory<StateType extends Record<string, unknown>>(
   threadId: string | undefined | null,
   client: Client,
-  clearCallbackRef: MutableRefObject<(() => void) | undefined>,
-  submittingRef: MutableRefObject<boolean>,
+  clearCallbackRef: RefObject<(() => void) | undefined>,
+  submittingRef: RefObject<boolean>,
 ) {
   const [history, setHistory] = useState<ThreadState<StateType>[]>([]);
 
+  const clientHash = getClientConfigHash(client);
+  const clientRef = useRef(client);
+  clientRef.current = client;
+
   const fetcher = useCallback(
     (
       threadId: string | undefined | null,
     ): Promise<ThreadState<StateType>[]> => {
       if (threadId != null) {
+        const client = clientRef.current;
         return fetchHistory<StateType>(client, threadId).then((history) => {
           setHistory(history);
           return history;
@@ -342,7 +347,7 @@ function useThreadHistory<StateType extends Record<string, unknown>>(
   useEffect(() => {
     if (submittingRef.current) return;
     fetcher(threadId);
-  }, [fetcher, submittingRef, threadId]);
+  }, [fetcher, clientHash, submittingRef, threadId]);
 
   return {
     data: history,
@@ -506,6 +511,31 @@ export interface UseStreamOptions<
    */
   onDebugEvent?: (data: DebugStreamEvent["data"]) => void;
 
+  /**
+   * Callback that is called when the stream is stopped by the user.
+   * Provides a mutate function to update the stream state immediately
+   * without requiring a server roundtrip.
+   *
+   * @example
+   * ```typescript
+   * onStop: ({ mutate }) => {
+   *   mutate((prev) => ({
+   *     ...prev,
+   *     ui: prev.ui?.map(component =>
+   *       component.props.isLoading
+   *         ? { ...component, props: { ...component.props, stopped: true, isLoading: false }}
+   *         : component
+   *     )
+   *   }));
+   * }
+   * ```
+   */
+  onStop?: (options: {
+    mutate: (
+      update: Partial<StateType> | ((prev: StateType) => Partial<StateType>),
+    ) => void;
+  }) => void;
+
   /**
    * The ID of the thread to fetch history and current values from.
    */
@@ -518,6 +548,17 @@ export interface UseStreamOptions<
 
   /** Will reconnect the stream on mount */
   reconnectOnMount?: boolean | (() => RunMetadataStorage);
+
+  /**
+   * Initial values to display immediately when loading a thread.
+   * Useful for displaying cached thread data while official history loads.
+   * These values will be replaced when official thread data is fetched.
+   *
+   * Note: UI components from initialValues will render immediately if they're
+   * predefined in LoadExternalComponent's components prop, providing instant
+   * cached UI display without server fetches.
+   */
+  initialValues?: StateType | null;
 }
 
 interface RunMetadataStorage {
@@ -616,7 +657,11 @@ export interface UseStream<
   /**
    * Join an active stream.
    */
-  joinStream: (runId: string) => Promise<void>;
+  joinStream: (
+    runId: string,
+    lastEventId?: string,
+    options?: { streamMode?: StreamMode | StreamMode[] },
+  ) => Promise<void>;
 }
 
 type ConfigWithConfigurable<ConfigurableType extends Record<string, unknown>> =
@@ -647,6 +692,61 @@ interface SubmitOptions<
    */
   streamSubgraphs?: boolean;
   streamResumable?: boolean;
+  /**
+   * The ID to use when creating a new thread. When provided, this ID will be used
+   * for thread creation when threadId is `null` or `undefined`.
+   * This enables optimistic UI updates where you know the thread ID
+   * before the thread is actually created.
+   */
+  threadId?: string;
+}
+
+function useStreamValuesState<StateType extends Record<string, unknown>>() {
+  type Kind = "stream" | "stop";
+  type Values = StateType | null;
+  type Update = Values | ((prev: Values, kind?: Kind) => Values);
+  type Mutate = Partial<StateType> | ((prev: StateType) => Partial<StateType>);
+
+  const [values, setValues] = useState<[values: StateType, kind: Kind] | null>(
+    null,
+  );
+
+  const setStreamValues = useCallback(
+    (values: Update, kind: Kind = "stream") => {
+      if (typeof values === "function") {
+        setValues((prevTuple) => {
+          const [prevValues, prevKind] = prevTuple ?? [null, "stream"];
+          const next = values(prevValues, prevKind);
+
+          if (next == null) return null;
+          return [next, kind] as [StateType, Kind];
+        });
+
+        return;
+      }
+
+      if (values == null) setValues(null);
+      setValues([values, kind] as [StateType, Kind]);
+    },
+    [],
+  );
+
+  const mutate = useCallback(
+    (kind: Kind, serverValues: StateType) => (update: Mutate) => {
+      setStreamValues((clientValues) => {
+        const prev = { ...serverValues, ...clientValues };
+        const next = typeof update === "function" ? update(prev) : update;
+        return { ...prev, ...next };
+      }, kind);
+    },
+    [setStreamValues],
+  );
+
+  return [values?.[0] ?? null, setStreamValues, mutate] as [
+    Values,
+    (update: Update, kind?: Kind) => void,
+    (kind: Kind, serverValues: StateType) => (update: Mutate) => void,
+  ];
 }
 
 export function useStream<
@@ -712,7 +812,8 @@ export function useStream<
   const [isLoading, setIsLoading] = useState(false);
 
   const [streamError, setStreamError] = useState<unknown>(undefined);
-  const [streamValues, setStreamValues] = useState<StateType | null>(null);
+  const [streamValues, setStreamValues, getMutateFn] =
+    useStreamValuesState<StateType>();
 
   const messageManagerRef = useRef(new MessageTupleManager());
   const submittingRef = useRef(false);
@@ -783,7 +884,9 @@ export function useStream<
   );
 
   const threadHead: ThreadState<StateType> | undefined = flatHistory.at(-1);
-  const historyValues = threadHead?.values ?? ({} as StateType);
+  const historyValues =
+    threadHead?.values ?? options.initialValues ?? ({} as StateType);
+
   const historyError = (() => {
     const error = threadHead?.tasks?.at(-1)?.error;
     if (error == null) return undefined;
@@ -848,6 +951,8 @@ export function useStream<
       if (runId) client.runs.cancel(threadId, runId);
       runMetadataStorage.removeItem(`lg:stream:${threadId}`);
     }
+
+    options?.onStop?.({ mutate: getMutateFn("stop", historyValues) });
   };
 
   async function consumeStream(
@@ -880,15 +985,7 @@ export function useStream<
         if (event === "updates") options.onUpdateEvent?.(data);
         if (event === "custom")
           options.onCustomEvent?.(data, {
-            mutate: (update) =>
-              setStreamValues((prev) => {
-                // should not happen
-                if (prev == null) return prev;
-                return {
-                  ...prev,
-                  ...(typeof update === "function" ? update(prev) : update),
-                };
-              }),
+            mutate: getMutateFn("stream", historyValues),
           });
         if (event === "metadata") options.onMetadataEvent?.(data);
         if (event === "events") options.onLangChainEvent?.(data);
@@ -930,8 +1027,11 @@ export function useStream<
 
       // TODO: stream created checkpoints to avoid an unnecessary network request
       const result = await run.onSuccess();
-
-      setStreamValues(null);
+      setStreamValues((values, kind) => {
+        // Do not clear out the user values set on `stop`.
+        if (kind === "stop") return values;
+        return null;
+      });
       if (streamError != null) throw streamError;
 
       const lastHead = result.at(0);
@@ -957,13 +1057,18 @@ export function useStream<
     }
   }
 
-  const joinStream = async (runId: string, lastEventId?: string) => {
+  const joinStream = async (
+    runId: string,
+    lastEventId?: string,
+    options?: { streamMode?: StreamMode | StreamMode[] },
+  ) => {
     lastEventId ??= "-1";
     if (!threadId) return;
     await consumeStream(async (signal: AbortSignal) => {
       const stream = client.runs.joinStream(threadId, runId, {
         signal,
         lastEventId,
+        streamMode: options?.streamMode,
       }) as AsyncGenerator<EventStreamEvent>;
 
       return {
@@ -989,26 +1094,24 @@ export function useStream<
 
       if (newPath != null) setBranch(newPath ?? "");
 
-      // Assumption: we're setting the initial value
-      // Used for instant feedback
       setStreamValues(() => {
-        const values = { ...historyValues };
-
         if (submitOptions?.optimisticValues != null) {
           return {
-            ...values,
+            ...historyValues,
             ...(typeof submitOptions.optimisticValues === "function"
-              ? submitOptions.optimisticValues(values)
+              ? submitOptions.optimisticValues(historyValues)
               : submitOptions.optimisticValues),
           };
         }
 
-        return values;
+        return { ...historyValues };
       });
 
       let usableThreadId = threadId;
       if (!usableThreadId) {
-        const thread = await client.threads.create();
+        const thread = await client.threads.create({
+          threadId: submitOptions?.threadId,
+        });
         onThreadId(thread.thread_id);
         usableThreadId = thread.thread_id;
       }

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

@@ -20,7 +20,7 @@ describe("BytesLineDecoder", () => {
 
   test("handles single line with newline", async () => {
     const input = createStream([textEncoder.encode("hello\n")]);
-    const decoded = input.pipeThrough(new BytesLineDecoder());
+    const decoded = input.pipeThrough(BytesLineDecoder());
     const results = await gather(decoded);
 
     expect(results.length).toBe(1);
@@ -29,7 +29,7 @@ describe("BytesLineDecoder", () => {
 
   test("handles multiple lines", async () => {
     const input = createStream([textEncoder.encode("line1\nline2\nline3\n")]);
-    const decoded = input.pipeThrough(new BytesLineDecoder());
+    const decoded = input.pipeThrough(BytesLineDecoder());
     const results = await gather(decoded);
 
     expect(results.length).toBe(3);
@@ -44,7 +44,7 @@ describe("BytesLineDecoder", () => {
       textEncoder.encode("ne1\nli"),
       textEncoder.encode("ne2\n"),
     ]);
-    const decoded = input.pipeThrough(new BytesLineDecoder());
+    const decoded = input.pipeThrough(BytesLineDecoder());
     const results = await gather(decoded);
 
     expect(results.length).toBe(2);
@@ -54,7 +54,7 @@ describe("BytesLineDecoder", () => {
 
   test("handles CR LF line endings", async () => {
     const input = createStream([textEncoder.encode("line1\r\nline2\r\n")]);
-    const decoded = input.pipeThrough(new BytesLineDecoder());
+    const decoded = input.pipeThrough(BytesLineDecoder());
     const results = await gather(decoded);
 
     expect(results.length).toBe(2);
@@ -67,7 +67,7 @@ describe("BytesLineDecoder", () => {
       textEncoder.encode("line1\r"),
       textEncoder.encode("\nline2\r\n"),
     ]);
-    const decoded = input.pipeThrough(new BytesLineDecoder());
+    const decoded = input.pipeThrough(BytesLineDecoder());
     const results = await gather(decoded);
 
     expect(results.length).toBe(2);
@@ -77,7 +77,7 @@ describe("BytesLineDecoder", () => {
 
   test("handles stale line", async () => {
     const input = createStream([textEncoder.encode("hello")]);
-    const decoded = input.pipeThrough(new BytesLineDecoder());
+    const decoded = input.pipeThrough(BytesLineDecoder());
     const results = await gather(decoded);
 
     expect(results.length).toBe(1);
@@ -99,8 +99,8 @@ describe("SSEDecoder", () => {
       "\n",
     ]);
     const decoded = input
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     const results = await gather(decoded);
     expect(results.length).toBe(1);
@@ -117,8 +117,8 @@ describe("SSEDecoder", () => {
       'data: {"message": "hello"}\n',
     ]);
     const decoded = input
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     const results = await gather(decoded);
     expect(results.length).toBe(1);
@@ -138,8 +138,8 @@ describe("SSEDecoder", () => {
       "\n",
     ]);
     const decoded = input
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     const results = await gather(decoded);
     expect(results.length).toBe(2);
@@ -156,8 +156,8 @@ describe("SSEDecoder", () => {
   test("end event without data", async () => {
     const input = createStream(["event: test\n"]);
     const decoded = input
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     const results = await gather(decoded);
     expect(results.length).toBe(1);
@@ -170,8 +170,8 @@ describe("SSEDecoder", () => {
   test("end event without newline", async () => {
     const input = createStream(["event: end"]);
     const decoded = input
-      .pipeThrough(new BytesLineDecoder())
-      .pipeThrough(new SSEDecoder());
+      .pipeThrough(BytesLineDecoder())
+      .pipeThrough(SSEDecoder());
 
     const results = await gather(decoded);
     expect(results.length).toBe(1);

libs/sdk-js/src/tests/stream.test.tsx

@@ -1,14 +1,58 @@
+import "@testing-library/jest-dom/vitest";
+
 import { describe, it, expect, beforeEach, afterEach, vi } from "vitest";
 import { render, screen, waitFor } from "@testing-library/react";
 import { userEvent } from "@testing-library/user-event";
 import { setupServer } from "msw/node";
-import { http, HttpResponse } from "msw";
+import { http } from "msw";
 import { useStream } from "../react/stream.js";
-import "@testing-library/jest-dom/vitest";
+import type { Message } from "../types.messages.js";
+
+import { StateGraph, MessagesAnnotation, START } from "@langchain/langgraph";
+import { MemorySaver } from "@langchain/langgraph-checkpoint";
+import { FakeStreamingChatModel } from "@langchain/core/utils/testing";
+import { AIMessage } from "@langchain/core/messages";
+import { createEmbedServer } from "@langchain/langgraph-api/experimental/embed";
+import { randomUUID } from "node:crypto";
+import { useState } from "react";
+
+const threads = (() => {
+  const THREADS: Record<
+    string,
+    { thread_id: string; metadata: Record<string, unknown> }
+  > = {};
+
+  return {
+    get: async (id: string) => THREADS[id],
+    put: async (
+      threadId: string,
+      { metadata }: { metadata?: Record<string, unknown> },
+    ) => {
+      THREADS[threadId] = { thread_id: threadId, metadata: metadata ?? {} };
+    },
+    delete: async (threadId: string) => {
+      delete THREADS[threadId];
+    },
+  };
+})();
+
+const checkpointer = new MemorySaver();
+
+const model = new FakeStreamingChatModel({ responses: [new AIMessage("Hey")] });
+const agent = new StateGraph(MessagesAnnotation)
+  .addNode("agent", async (state: { messages: Message[] }) => {
+    const response = await model.invoke(state.messages);
+    return { messages: [response] };
+  })
+  .addEdge(START, "agent")
+  .compile();
+
+const app = createEmbedServer({ graph: { agent }, checkpointer, threads });
+const server = setupServer(http.all("*", (ctx) => app.fetch(ctx.request)));
 
 function TestChatComponent() {
   const { messages, isLoading, error, submit, stop } = useStream({
-    assistantId: "test-assistant",
+    assistantId: "agent",
     apiKey: "test-api-key",
   });
 
@@ -42,353 +86,6 @@ function TestChatComponent() {
   );
 }
 
-// Mock server setup
-
-const server = setupServer(
-  // Mock thread creation
-  http.post("*/threads", () => {
-    return HttpResponse.json({ thread_id: "test-thread-id" });
-  }),
-
-  // Mock stream endpoint
-  http.post("*/threads/:threadId/runs/stream", async () => {
-    const encoder = new TextEncoder();
-    const sendSSE = (event: string, data: unknown) =>
-      encoder.encode(`event: ${event}\ndata: ${JSON.stringify(data)}\n\n`);
-
-    const stream = new ReadableStream({
-      async start(controller) {
-        await new Promise((resolve) => setTimeout(resolve, 10));
-
-        controller.enqueue(
-          sendSSE("metadata", {
-            run_id: "1f03278a-1734-6518-80a4-3390db59f960",
-            attempt: 1,
-          }),
-        );
-
-        controller.enqueue(
-          sendSSE("values", {
-            messages: [
-              {
-                content: "Hey",
-                additional_kwargs: {},
-                response_metadata: {},
-                type: "human",
-                name: null,
-                id: "2d8c0d9f-a614-4e44-b474-6a56e9471cf5",
-                example: false,
-              },
-            ],
-          }),
-        );
-
-        controller.enqueue(
-          sendSSE("messages", [
-            {
-              content: "",
-              additional_kwargs: {},
-              response_metadata: { model_name: "claude-3-7-sonnet-latest" },
-              type: "AIMessageChunk",
-              name: null,
-              id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-              tool_calls: [],
-              invalid_tool_calls: [],
-              tool_call_chunks: [],
-            },
-            { run_attempt: 1 },
-          ]),
-        );
-
-        controller.enqueue(
-          sendSSE("messages", [
-            {
-              content: "Hello",
-              additional_kwargs: {},
-              response_metadata: { model_name: "claude-3-7-sonnet-latest" },
-              type: "AIMessageChunk",
-              name: null,
-              id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-              tool_calls: [],
-              invalid_tool_calls: [],
-              tool_call_chunks: [],
-            },
-            { run_attempt: 1 },
-          ]),
-        );
-
-        controller.enqueue(
-          sendSSE("messages", [
-            {
-              content: "! How can I assist you today?",
-              additional_kwargs: {},
-              response_metadata: { model_name: "claude-3-7-sonnet-latest" },
-              type: "AIMessageChunk",
-              name: null,
-              id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-              tool_calls: [],
-              invalid_tool_calls: [],
-              tool_call_chunks: [],
-            },
-            { run_attempt: 1 },
-          ]),
-        );
-
-        controller.enqueue(
-          sendSSE("messages", [
-            {
-              content: "",
-              additional_kwargs: {},
-              response_metadata: {
-                stop_reason: "end_turn",
-                stop_sequence: null,
-              },
-              type: "AIMessageChunk",
-              name: null,
-              id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-              tool_calls: [],
-              invalid_tool_calls: [],
-              tool_call_chunks: [],
-            },
-            { run_attempt: 1 },
-          ]),
-        );
-
-        controller.enqueue(
-          sendSSE("values", {
-            messages: [
-              {
-                content: "Hey",
-                additional_kwargs: {},
-                response_metadata: {},
-                type: "human",
-                name: null,
-                id: "2d8c0d9f-a614-4e44-b474-6a56e9471cf5",
-                example: false,
-              },
-              {
-                content: "Hello! How can I assist you today?",
-                additional_kwargs: {},
-                response_metadata: {
-                  model_name: "claude-3-7-sonnet-latest",
-                  stop_reason: "end_turn",
-                  stop_sequence: null,
-                },
-                type: "ai",
-                name: null,
-                id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-                tool_calls: [],
-                invalid_tool_calls: [],
-              },
-            ],
-          }),
-        );
-
-        controller.close();
-      },
-    });
-
-    server.use(
-      http.post("*/threads/:threadId/history", () => {
-        return HttpResponse.json([
-          {
-            values: {
-              messages: [
-                {
-                  content: "Hey",
-                  additional_kwargs: {},
-                  response_metadata: {},
-                  type: "human",
-                  name: null,
-                  id: "2d8c0d9f-a614-4e44-b474-6a56e9471cf5",
-                  example: false,
-                },
-                {
-                  content: "Hello! How can I assist you today?",
-                  additional_kwargs: {},
-                  response_metadata: {
-                    model_name: "claude-3-7-sonnet-latest",
-                    stop_reason: "end_turn",
-                    stop_sequence: null,
-                  },
-                  type: "ai",
-                  name: null,
-                  id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-                  example: false,
-                  tool_calls: [],
-                  invalid_tool_calls: [],
-                },
-              ],
-            },
-            next: [],
-            tasks: [],
-            metadata: {
-              run_attempt: 1,
-              source: "loop",
-              writes: {
-                agent: {
-                  messages: [
-                    {
-                      content: "Hello! How can I assist you today?",
-                      additional_kwargs: {},
-                      response_metadata: {
-                        model_name: "claude-3-7-sonnet-latest",
-                        stop_reason: "end_turn",
-                        stop_sequence: null,
-                      },
-                      type: "ai",
-                      name: null,
-                      id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-                      example: false,
-                      tool_calls: [],
-                      invalid_tool_calls: [],
-                    },
-                  ],
-                },
-              },
-              step: 1,
-              parents: {},
-            },
-            created_at: "2025-05-16T17:10:16.987537+00:00",
-            checkpoint: {
-              checkpoint_id: "1f03278a-38cf-6c68-8001-22b77ac43ff6",
-              thread_id: "b06fd92a-955c-446e-b233-7977716c4a9c",
-              checkpoint_ns: "",
-            },
-            parent_checkpoint: {
-              checkpoint_id: "1f03278a-206b-67c6-8000-ac34a0872e1a",
-              thread_id: "b06fd92a-955c-446e-b233-7977716c4a9c",
-              checkpoint_ns: "",
-            },
-            checkpoint_id: "1f03278a-38cf-6c68-8001-22b77ac43ff6",
-            parent_checkpoint_id: "1f03278a-206b-67c6-8000-ac34a0872e1a",
-          },
-          {
-            values: {
-              messages: [
-                {
-                  content: "Hey",
-                  additional_kwargs: {},
-                  response_metadata: {},
-                  type: "human",
-                  name: null,
-                  id: "2d8c0d9f-a614-4e44-b474-6a56e9471cf5",
-                  example: false,
-                },
-              ],
-            },
-            next: ["agent"],
-            tasks: [
-              {
-                id: "e1b7b52b-a78e-4b32-0c89-e06bf46405ed",
-                name: "agent",
-                path: ["__pregel_pull", "agent"],
-                error: null,
-                interrupts: [],
-                checkpoint: null,
-                state: null,
-                result: {
-                  messages: [
-                    {
-                      content: "Hello! How can I assist you today?",
-                      additional_kwargs: {},
-                      response_metadata: {
-                        model_name: "claude-3-7-sonnet-latest",
-                        stop_reason: "end_turn",
-                        stop_sequence: null,
-                      },
-                      type: "ai",
-                      name: null,
-                      id: "run-3e90ba6a-71d6-49e7-94a8-6bcac2fd0f40",
-                      example: false,
-                      tool_calls: [],
-                      invalid_tool_calls: [],
-                    },
-                  ],
-                },
-              },
-            ],
-            metadata: {
-              run_attempt: 1,
-            },
-            created_at: "2025-05-16T17:10:14.429889+00:00",
-            checkpoint: {
-              checkpoint_id: "1f03278a-206b-67c6-8000-ac34a0872e1a",
-              thread_id: "b06fd92a-955c-446e-b233-7977716c4a9c",
-              checkpoint_ns: "",
-            },
-            parent_checkpoint: {
-              checkpoint_id: "1f03278a-2067-6590-bfff-3fb740466fc3",
-              thread_id: "b06fd92a-955c-446e-b233-7977716c4a9c",
-              checkpoint_ns: "",
-            },
-            checkpoint_id: "1f03278a-206b-67c6-8000-ac34a0872e1a",
-            parent_checkpoint_id: "1f03278a-2067-6590-bfff-3fb740466fc3",
-          },
-          {
-            values: {
-              messages: [],
-            },
-            next: ["__start__"],
-            tasks: [
-              {
-                id: "291af033-2ddc-3320-8bbc-28060057cae5",
-                name: "__start__",
-                path: ["__pregel_pull", "__start__"],
-                error: null,
-                interrupts: [],
-                checkpoint: null,
-                state: null,
-                result: {
-                  messages: [
-                    {
-                      id: "2d8c0d9f-a614-4e44-b474-6a56e9471cf5",
-                      type: "human",
-                      content: "Hey",
-                    },
-                  ],
-                },
-              },
-            ],
-            metadata: {
-              run_attempt: 1,
-              source: "input",
-              writes: {
-                __start__: {
-                  messages: [
-                    {
-                      id: "2d8c0d9f-a614-4e44-b474-6a56e9471cf5",
-                      type: "human",
-                      content: "Hey",
-                    },
-                  ],
-                },
-              },
-              step: -1,
-              parents: {},
-            },
-            created_at: "2025-05-16T17:10:14.428191+00:00",
-            checkpoint: {
-              checkpoint_id: "1f03278a-2067-6590-bfff-3fb740466fc3",
-              thread_id: "b06fd92a-955c-446e-b233-7977716c4a9c",
-              checkpoint_ns: "",
-            },
-            parent_checkpoint: null,
-            checkpoint_id: "1f03278a-2067-6590-bfff-3fb740466fc3",
-            parent_checkpoint_id: null,
-          },
-        ]);
-      }),
-    );
-
-    return new HttpResponse(stream, {
-      headers: { "Content-Type": "text/event-stream" },
-    });
-  }),
-);
-
-server.use;
-
 describe("useStream", () => {
   beforeEach(() => server.listen());
 
@@ -417,10 +114,8 @@ describe("useStream", () => {
 
     // Wait for messages to appear
     await waitFor(() => {
-      expect(screen.getByTestId("message-0")).toHaveTextContent("Hey");
-      expect(screen.getByTestId("message-1")).toHaveTextContent(
-        "Hello! How can I assist you today?",
-      );
+      expect(screen.getByTestId("message-0")).toHaveTextContent("Hello");
+      expect(screen.getByTestId("message-1")).toHaveTextContent("Hey");
     });
 
     // Check final state
@@ -440,4 +135,316 @@ describe("useStream", () => {
       expect(screen.getByTestId("loading")).toHaveTextContent("Not loading");
     });
   });
+
+  it("displays initial values immediately and clears them when submitting", async () => {
+    const user = userEvent.setup();
+
+    function TestCachedComponent() {
+      const { messages, values, submit } = useStream<{
+        messages: Message[];
+      }>({
+        assistantId: "agent",
+        apiKey: "test-api-key",
+        initialValues: {
+          messages: [
+            { id: "cached-1", type: "human", content: "Cached user message" },
+            { id: "cached-2", type: "ai", content: "Cached AI response" },
+          ],
+        },
+      });
+
+      return (
+        <div>
+          <div data-testid="messages">
+            {messages.map((msg, i) => (
+              <div
+                key={msg.id ?? i}
+                data-testid={
+                  msg.id?.includes("cached")
+                    ? `message-cached-${i}`
+                    : `message-${i}`
+                }
+              >
+                {typeof msg.content === "string"
+                  ? msg.content
+                  : JSON.stringify(msg.content)}
+              </div>
+            ))}
+          </div>
+          <div data-testid="values">{JSON.stringify(values)}</div>
+          <button
+            data-testid="submit"
+            onClick={() =>
+              submit({ messages: [{ content: "Hello", type: "human" }] })
+            }
+          >
+            Submit
+          </button>
+        </div>
+      );
+    }
+
+    render(<TestCachedComponent />);
+
+    // Should immediately show cached messages
+    expect(screen.getByTestId("message-cached-0")).toHaveTextContent(
+      "Cached user message",
+    );
+    expect(screen.getByTestId("message-cached-1")).toHaveTextContent(
+      "Cached AI response",
+    );
+
+    // Values should include initial values
+    expect(screen.getByTestId("values")).toHaveTextContent(
+      "Cached user message",
+    );
+
+    // Submitting should clear out the cached messages
+    await user.click(screen.getByTestId("submit"));
+
+    // Wait for messages to appear
+    await waitFor(() => {
+      expect(screen.getByTestId("message-0")).toHaveTextContent("Hello");
+      expect(screen.getByTestId("message-1")).toHaveTextContent("Hey");
+    });
+  });
+
+  it("accepts newThreadId option without errors", async () => {
+    const user = userEvent.setup();
+
+    const spy = vi.fn();
+    const predeterminedThreadId = randomUUID();
+
+    // Test that newThreadId option can be passed without causing errors
+    function TestNewThreadComponent() {
+      const stream = useStream<{ messages: Message[] }>({
+        assistantId: "agent",
+        apiKey: "test-api-key",
+        threadId: null, // Start with no thread
+        onThreadId: spy, // Mock callback
+      });
+
+      return (
+        <div>
+          <div data-testid="loading">
+            {stream.isLoading ? "Loading..." : "Not loading"}
+          </div>
+          <div data-testid="thread-id">
+            {stream.client ? "Client ready" : "No client"}
+          </div>
+          <button
+            data-testid="submit"
+            onClick={() =>
+              stream.submit({}, { threadId: predeterminedThreadId })
+            }
+          >
+            Submit
+          </button>
+        </div>
+      );
+    }
+
+    render(<TestNewThreadComponent />);
+
+    // Should render without errors
+    expect(screen.getByTestId("loading")).toHaveTextContent("Not loading");
+    expect(screen.getByTestId("thread-id")).toHaveTextContent("Client ready");
+
+    await user.click(screen.getByTestId("submit"));
+    expect(spy).toHaveBeenCalledWith(predeterminedThreadId);
+    expect(await threads.get(predeterminedThreadId)).toEqual({
+      thread_id: predeterminedThreadId,
+      metadata: {
+        graph_id: "agent",
+        assistant_id: "agent",
+      },
+    });
+  });
+
+  it("onStop callback is called when stop is called", async () => {
+    const user = userEvent.setup();
+    const onStopCallback = vi.fn();
+
+    function TestComponent() {
+      const { submit, stop } = useStream({
+        assistantId: "agent",
+        apiKey: "test-api-key",
+        onStop: onStopCallback,
+      });
+
+      return (
+        <div>
+          <button data-testid="submit" onClick={() => submit({})}>
+            Send
+          </button>
+          <button data-testid="stop" onClick={stop}>
+            Stop
+          </button>
+        </div>
+      );
+    }
+
+    render(<TestComponent />);
+
+    // Start a stream and stop it
+    await user.click(screen.getByTestId("submit"));
+    await user.click(screen.getByTestId("stop"));
+
+    // Verify onStop was called with mutate function
+    expect(onStopCallback).toHaveBeenCalledTimes(1);
+    expect(onStopCallback).toHaveBeenCalledWith(
+      expect.objectContaining({
+        mutate: expect.any(Function),
+      }),
+    );
+  });
+
+  it("onStop mutate function updates stream values immediately", async () => {
+    const user = userEvent.setup();
+
+    function TestComponent() {
+      const [stopped, setStopped] = useState(false);
+      const { submit, stop, messages } = useStream<{ messages: Message[] }>({
+        assistantId: "agent",
+        apiKey: "test-api-key",
+        onStop: ({ mutate }) => {
+          setStopped(true);
+          mutate((prev) => ({
+            ...prev,
+            messages: [
+              ...(prev.messages ?? []),
+              { type: "ai", content: "Stream stopped" },
+            ],
+          }));
+        },
+      });
+
+      return (
+        <div>
+          <div data-testid="stopped-status">
+            {stopped ? "Stopped" : "Not stopped"}
+          </div>
+          <div data-testid="messages">
+            {messages.map((msg, i) => (
+              <div key={msg.id ?? i} data-testid={`message-${i}`}>
+                {typeof msg.content === "string"
+                  ? msg.content
+                  : JSON.stringify(msg.content)}
+              </div>
+            ))}
+          </div>
+          <button data-testid="submit" onClick={() => submit({})}>
+            Send
+          </button>
+          <button data-testid="stop" onClick={stop}>
+            Stop
+          </button>
+        </div>
+      );
+    }
+
+    render(<TestComponent />);
+
+    // Initial state
+    expect(screen.getByTestId("stopped-status")).toHaveTextContent(
+      "Not stopped",
+    );
+
+    // Start and stop stream
+    await user.click(screen.getByTestId("submit"));
+    await user.click(screen.getByTestId("stop"));
+
+    // Verify state was updated immediately
+    await waitFor(() => {
+      expect(screen.getByTestId("stopped-status")).toHaveTextContent("Stopped");
+      expect(screen.getByTestId("message-0")).toHaveTextContent(
+        "Stream stopped",
+      );
+    });
+  });
+
+  it("onStop handles functional updates correctly", async () => {
+    const user = userEvent.setup();
+
+    function TestComponent() {
+      const { submit, stop, values } = useStream({
+        assistantId: "agent",
+        apiKey: "test-api-key",
+        initialValues: {
+          counter: 5,
+          items: ["item1", "item2"],
+        },
+        onStop: ({ mutate }) => {
+          mutate((prev: any) => ({
+            ...prev,
+            counter: (prev.counter || 0) + 10,
+            items: [...(prev.items || []), "stopped"],
+          }));
+        },
+      });
+
+      return (
+        <div>
+          <div data-testid="counter">{(values as any).counter}</div>
+          <div data-testid="items">{(values as any).items?.join(", ")}</div>
+          <button data-testid="submit" onClick={() => submit({})}>
+            Send
+          </button>
+          <button data-testid="stop" onClick={stop}>
+            Stop
+          </button>
+        </div>
+      );
+    }
+
+    render(<TestComponent />);
+
+    // Initial state
+    expect(screen.getByTestId("counter")).toHaveTextContent("5");
+    expect(screen.getByTestId("items")).toHaveTextContent("item1, item2");
+
+    // Start and stop stream
+    await user.click(screen.getByTestId("submit"));
+    await user.click(screen.getByTestId("stop"));
+
+    // Verify functional update was applied correctly
+    await waitFor(() => {
+      expect(screen.getByTestId("counter")).toHaveTextContent("15");
+      expect(screen.getByTestId("items")).toHaveTextContent(
+        "item1, item2, stopped",
+      );
+    });
+  });
+
+  it("onStop is not called when stream completes naturally", async () => {
+    const user = userEvent.setup();
+
+    const onStopCallback = vi.fn();
+
+    function TestComponent() {
+      const { submit } = useStream({
+        assistantId: "agent",
+        apiKey: "test-api-key",
+        onStop: onStopCallback,
+      });
+
+      return (
+        <div>
+          <button data-testid="submit" onClick={() => submit({})}>
+            Send
+          </button>
+        </div>
+      );
+    }
+
+    render(<TestComponent />);
+
+    // Start a stream and let it complete naturally
+    await user.click(screen.getByTestId("submit"));
+
+    // Wait for stream to complete naturally
+    await waitFor(() => {
+      expect(onStopCallback).not.toHaveBeenCalled();
+    });
+  });
 });

libs/sdk-js/src/types.messages.ts

@@ -13,16 +13,22 @@ type MessageContent = string | MessageContentComplex[];
  */
 type MessageAdditionalKwargs = Record<string, unknown>;
 
-export type HumanMessage = {
-  type: "human";
-  id?: string | undefined;
+type BaseMessage = {
+  additional_kwargs?: MessageAdditionalKwargs | undefined;
   content: MessageContent;
+  id?: string | undefined;
+  name?: string | undefined;
+  response_metadata?: Record<string, unknown> | undefined;
 };
 
-export type AIMessage = {
+export type HumanMessage = BaseMessage & {
+  type: "human";
+  example?: boolean | undefined;
+};
+
+export type AIMessage = BaseMessage & {
   type: "ai";
-  id?: string | undefined;
-  content: MessageContent;
+  example?: boolean | undefined;
   tool_calls?:
     | {
         name: string;
@@ -57,19 +63,12 @@ export type AIMessage = {
           | undefined;
       }
     | undefined;
-  additional_kwargs?: MessageAdditionalKwargs | undefined;
-  response_metadata?: Record<string, unknown> | undefined;
 };
 
-export type ToolMessage = {
+export type ToolMessage = BaseMessage & {
   type: "tool";
-  name?: string | undefined;
-  id?: string | undefined;
-  content: MessageContent;
   status?: "error" | "success" | undefined;
   tool_call_id: string;
-  additional_kwargs?: MessageAdditionalKwargs | undefined;
-  response_metadata?: Record<string, unknown> | undefined;
   /**
    * Artifact of the Tool execution which is not meant to be sent to the model.
    *
@@ -81,22 +80,16 @@ export type ToolMessage = {
   artifact?: any;
 };
 
-export type SystemMessage = {
+export type SystemMessage = BaseMessage & {
   type: "system";
-  id?: string | undefined;
-  content: MessageContent;
 };
 
-export type FunctionMessage = {
+export type FunctionMessage = BaseMessage & {
   type: "function";
-  id?: string | undefined;
-  content: MessageContent;
 };
 
-export type RemoveMessage = {
+export type RemoveMessage = BaseMessage & {
   type: "remove";
-  id: string;
-  content: MessageContent;
 };
 
 export type Message =

libs/sdk-js/src/utils/sse.ts

@@ -6,90 +6,88 @@ const SPACE = " ".charCodeAt(0);
 
 const TRAILING_NEWLINE = [CR, LF];
 
-export class BytesLineDecoder extends TransformStream<Uint8Array, Uint8Array> {
-  constructor() {
-    let buffer: Uint8Array[] = [];
-    let trailingCr = false;
+export function BytesLineDecoder() {
+  let buffer: Uint8Array[] = [];
+  let trailingCr = false;
 
-    super({
-      start() {
-        buffer = [];
+  return new TransformStream<Uint8Array, Uint8Array>({
+    start() {
+      buffer = [];
+      trailingCr = false;
+    },
+
+    transform(chunk, controller) {
+      // See https://docs.python.org/3/glossary.html#term-universal-newlines
+      let text = chunk;
+
+      // Handle trailing CR from previous chunk
+      if (trailingCr) {
+        text = joinArrays([[CR], text]);
         trailingCr = false;
-      },
+      }
 
-      transform(chunk, controller) {
-        // See https://docs.python.org/3/glossary.html#term-universal-newlines
-        let text = chunk;
+      // Check for trailing CR in current chunk
+      if (text.length > 0 && text.at(-1) === CR) {
+        trailingCr = true;
+        text = text.subarray(0, -1);
+      }
 
-        // Handle trailing CR from previous chunk
-        if (trailingCr) {
-          text = joinArrays([[CR], text]);
-          trailingCr = false;
-        }
+      if (!text.length) return;
+      const trailingNewline = TRAILING_NEWLINE.includes(text.at(-1)!);
 
-        // Check for trailing CR in current chunk
-        if (text.length > 0 && text.at(-1) === CR) {
-          trailingCr = true;
-          text = text.subarray(0, -1);
-        }
+      const lastIdx = text.length - 1;
+      const { lines } = text.reduce<{ lines: Uint8Array[]; from: number }>(
+        (acc, cur, idx) => {
+          if (acc.from > idx) return acc;
 
-        if (!text.length) return;
-        const trailingNewline = TRAILING_NEWLINE.includes(text.at(-1)!);
-
-        const lastIdx = text.length - 1;
-        const { lines } = text.reduce<{ lines: Uint8Array[]; from: number }>(
-          (acc, cur, idx) => {
-            if (acc.from > idx) return acc;
-
-            if (cur === CR || cur === LF) {
-              acc.lines.push(text.subarray(acc.from, idx));
-              if (cur === CR && text[idx + 1] === LF) {
-                acc.from = idx + 2;
-              } else {
-                acc.from = idx + 1;
-              }
+          if (cur === CR || cur === LF) {
+            acc.lines.push(text.subarray(acc.from, idx));
+            if (cur === CR && text[idx + 1] === LF) {
+              acc.from = idx + 2;
+            } else {
+              acc.from = idx + 1;
             }
+          }
 
-            if (idx === lastIdx && acc.from <= lastIdx) {
-              acc.lines.push(text.subarray(acc.from));
-            }
+          if (idx === lastIdx && acc.from <= lastIdx) {
+            acc.lines.push(text.subarray(acc.from));
+          }
 
-            return acc;
-          },
-          { lines: [], from: 0 },
-        );
+          return acc;
+        },
+        { lines: [], from: 0 },
+      );
 
-        if (lines.length === 1 && !trailingNewline) {
-          buffer.push(lines[0]);
-          return;
-        }
+      if (lines.length === 1 && !trailingNewline) {
+        buffer.push(lines[0]);
+        return;
+      }
 
-        if (buffer.length) {
-          // Include existing buffer in first line
-          buffer.push(lines[0]);
-          lines[0] = joinArrays(buffer);
-          buffer = [];
-        }
+      if (buffer.length) {
+        // Include existing buffer in first line
+        buffer.push(lines[0]);
+        lines[0] = joinArrays(buffer);
+        buffer = [];
+      }
 
-        if (!trailingNewline) {
-          // If the last segment is not newline terminated,
-          // buffer it for the next chunk
-          if (lines.length) buffer = [lines.pop()!];
-        }
+      if (!trailingNewline) {
+        // If the last segment is not newline terminated,
+        // buffer it for the next chunk
+        if (lines.length) buffer = [lines.pop()!];
+      }
 
-        // Enqueue complete lines
-        for (const line of lines) {
-          controller.enqueue(line);
-        }
-      },
+      // Enqueue complete lines
+      for (const line of lines) {
+        controller.enqueue(line);
+      }
+    },
 
-      flush(controller) {
-        if (buffer.length) {
-          controller.enqueue(joinArrays(buffer));
-        }
-      },
-    });
-  }
+    flush(controller) {
+      if (buffer.length) {
+        controller.enqueue(joinArrays(buffer));
+      }
+    },
+  });
 }
 
 interface StreamPart {
@@ -98,69 +96,67 @@ interface StreamPart {
   data: unknown;
 }
 
-export class SSEDecoder extends TransformStream<Uint8Array, StreamPart> {
-  constructor() {
-    let event = "";
-    let data: Uint8Array[] = [];
-    let lastEventId = "";
-    let retry: number | null = null;
+export function SSEDecoder() {
+  let event = "";
+  let data: Uint8Array[] = [];
+  let lastEventId = "";
+  let retry: number | null = null;
 
-    const decoder = new TextDecoder();
+  const decoder = new TextDecoder();
 
-    super({
-      transform(chunk, controller) {
-        // Handle empty line case
-        if (!chunk.length) {
-          if (!event && !data.length && !lastEventId && retry == null) return;
+  return new TransformStream<Uint8Array, StreamPart>({
+    transform(chunk, controller) {
+      // Handle empty line case
+      if (!chunk.length) {
+        if (!event && !data.length && !lastEventId && retry == null) return;
 
-          const sse = {
-            id: lastEventId || undefined,
-            event,
-            data: data.length ? decodeArraysToJson(decoder, data) : null,
-          };
+        const sse = {
+          id: lastEventId || undefined,
+          event,
+          data: data.length ? decodeArraysToJson(decoder, data) : null,
+        };
 
-          // NOTE: as per the SSE spec, do not reset lastEventId
-          event = "";
-          data = [];
-          retry = null;
+        // NOTE: as per the SSE spec, do not reset lastEventId
+        event = "";
+        data = [];
+        retry = null;
 
-          controller.enqueue(sse);
-          return;
-        }
+        controller.enqueue(sse);
+        return;
+      }
 
-        // Ignore comments
-        if (chunk[0] === COLON) return;
+      // Ignore comments
+      if (chunk[0] === COLON) return;
 
-        const sepIdx = chunk.indexOf(COLON);
-        if (sepIdx === -1) return;
+      const sepIdx = chunk.indexOf(COLON);
+      if (sepIdx === -1) return;
 
-        const fieldName = decoder.decode(chunk.subarray(0, sepIdx));
-        let value = chunk.subarray(sepIdx + 1);
-        if (value[0] === SPACE) value = value.subarray(1);
+      const fieldName = decoder.decode(chunk.subarray(0, sepIdx));
+      let value = chunk.subarray(sepIdx + 1);
+      if (value[0] === SPACE) value = value.subarray(1);
 
-        if (fieldName === "event") {
-          event = decoder.decode(value);
-        } else if (fieldName === "data") {
-          data.push(value);
-        } else if (fieldName === "id") {
-          if (value.indexOf(NULL) === -1) lastEventId = decoder.decode(value);
-        } else if (fieldName === "retry") {
-          const retryNum = Number.parseInt(decoder.decode(value));
-          if (!Number.isNaN(retryNum)) retry = retryNum;
-        }
-      },
+      if (fieldName === "event") {
+        event = decoder.decode(value);
+      } else if (fieldName === "data") {
+        data.push(value);
+      } else if (fieldName === "id") {
+        if (value.indexOf(NULL) === -1) lastEventId = decoder.decode(value);
+      } else if (fieldName === "retry") {
+        const retryNum = Number.parseInt(decoder.decode(value));
+        if (!Number.isNaN(retryNum)) retry = retryNum;
+      }
+    },
 
-      flush(controller) {
-        if (event) {
-          controller.enqueue({
-            id: lastEventId || undefined,
-            event,
-            data: data.length ? decodeArraysToJson(decoder, data) : null,
-          });
-        }
-      },
-    });
-  }
+    flush(controller) {
+      if (event) {
+        controller.enqueue({
+          id: lastEventId || undefined,
+          event,
+          data: data.length ? decodeArraysToJson(decoder, data) : null,
+        });
+      }
+    },
+  });
 }
 
 function joinArrays(data: ArrayLike<number>[]) {

libs/sdk-py/pyproject.toml

@@ -21,13 +21,13 @@ Repository = "https://www.github.com/langchain-ai/langgraph"
 
 [dependency-groups]
 dev = [
-  "ruff",
+  "ruff>=0.12.0",
   "codespell",
-  "pytest",
+  "pytest>=8.0.0",
   "pytest-asyncio",
   "pytest-mock",
   "pytest-watch",
-  "mypy",
+  "mypy>=1.15.0",
 ]
 
 [tool.hatch.build.targets.wheel]

libs/sdk-py/uv.lock

@@ -146,12 +146,12 @@ requires-dist = [
 [package.metadata.requires-dev]
 dev = [
     { name = "codespell" },
-    { name = "mypy" },
-    { name = "pytest" },
+    { name = "mypy", specifier = ">=1.15.0" },
+    { name = "pytest", specifier = ">=8.0.0" },
     { name = "pytest-asyncio" },
     { name = "pytest-mock" },
     { name = "pytest-watch" },
-    { name = "ruff" },
+    { name = "ruff", specifier = ">=0.12.0" },
 ]
 
 [[package]]
@@ -360,27 +360,27 @@ sdist = { url = "https://files.pythonhosted.org/packages/36/47/ab65fc1d682befc31
 
 [[package]]
 name = "ruff"
-version = "0.11.10"
+version = "0.12.1"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/e8/4c/4a3c5a97faaae6b428b336dcca81d03ad04779f8072c267ad2bd860126bf/ruff-0.11.10.tar.gz", hash = "sha256:d522fb204b4959909ecac47da02830daec102eeb100fb50ea9554818d47a5fa6", size = 4165632, upload-time = "2025-05-15T14:08:56.76Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/97/38/796a101608a90494440856ccfb52b1edae90de0b817e76bfade66b12d320/ruff-0.12.1.tar.gz", hash = "sha256:806bbc17f1104fd57451a98a58df35388ee3ab422e029e8f5cf30aa4af2c138c", size = 4413426, upload-time = "2025-06-26T20:34:14.784Z" }
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