Fix broken code

- Make sure that we're calling `getType` instead of deprecated `_getType()`
- Make sure that we're referencing the proper camelCase symbols instead of snake_case symbols
- Make sure that we're using proper links to the API reference
- Make sure to chain calls of StateGraph methods
- Make sure to use Zod state in all snippets

docs/Makefile

@@ -15,8 +15,8 @@ build-prebuilt:
 	fi
 	uv run python -m _scripts.third_party_page.create_third_party_page stats.yml docs/agents/prebuilt.md --language python
 
-build-docs: build-prebuilt
-	uv run python -m mkdocs build --clean -f mkdocs.yml --strict
+build-docs: build-typedoc build-prebuilt
+	TARGET_LANGUAGE=python 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/notebook_hooks.py

@@ -310,6 +310,12 @@ 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,
@@ -332,16 +338,15 @@ def _on_page_markdown_with_config(
     markdown = _highlight_code_blocks(markdown)
 
     # Apply conditional rendering for code blocks
-    target_language = kwargs.get("target_language", "python")
-    markdown = _apply_conditional_rendering(markdown, target_language)
-    if target_language == "js":
+    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/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
 
@@ -13,13 +13,45 @@ 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).
+    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`
 
@@ -27,6 +59,8 @@ 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
 
@@ -46,24 +80,43 @@ 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 [`add_messages`](https://langchain-ai.github.io/langgraph/reference/graphs/?h=add+messages#add_messages) function used with the `Annotated` syntax.
+2. Updates to `messages` will be appended to the existing list rather than overwriting it, thanks to the prebuilt reducer function.
 
-------
+---
+
+---
 
 !!! 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 `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).
+    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).
 
 ## 3. Add a node
 
-Next, add a "`chatbot`" node. **Nodes** represent units of work and are typically regular Python functions.
+Next, add a "`chatbot`" node. **Nodes** represent units of work and are typically regular functions.
 
 Let's first select a chat model:
 
-{% include-markdown "../../../snippets/chat_model_tabs.md" %}
+{!snippets/chat_model_tabs.md!}
 
 <!---
 ```python
@@ -73,9 +126,26 @@ 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):
@@ -88,38 +158,133 @@ 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 `CompiledStateGraph` we can invoke on our state.
+on the graph builder. This creates a `CompiledGraph` we can invoke on our state.
+
+:::python
 
 ```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
@@ -132,17 +297,35 @@ except Exception:
     pass
 ```
 
-![basic chatbot diagram](basic-chatbot.png)
+:::
 
+:::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}]}):
@@ -165,15 +348,90 @@ while True:
         break
 ```
 
+:::
+
+:::js
+
+```typescript
+import { HumanMessage } from "@langchain/core/messages";
+
+async function streamGraphUpdates(userInput: string) {
+  const stream = await graph.stream({
+    messages: [new HumanMessage(userInput)],
+  });
+
+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) {
+    for (const value of Object.values(event)) {
+      console.log(
+        "Assistant:",
+        value.messages[value.messages.length - 1].content
+      );
+    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.
+```
+
+:::python
+
+```
 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
+
 ```python
 from typing import Annotated
 
@@ -207,8 +465,44 @@ graph_builder.add_edge("chatbot", END)
 graph = graph_builder.compile()
 ```
 
+:::
+
+:::js
+
+```typescript
+import { Annotation } from "@langchain/langgraph";
+import { StateGraph, START, END } from "@langchain/langgraph";
+import { BaseMessage, HumanMessage } from "@langchain/core/messages";
+import { ChatOpenAI } from "@langchain/openai";
+
+const State = Annotation.Root({
+  messages: Annotation<BaseMessage[]>({
+    reducer: (x, y) => x.concat(y),
+  }),
+});
+
+const graphBuilder = new StateGraph(State);
+
+const llm = new ChatOpenAI({
+  model: "gpt-4o",
+  temperature: 0,
+});
+
+const chatbot = async (state: typeof State.State) => {
+  return { messages: [await llm.invoke(state.messages)] };
+};
+
+// The first argument is the unique node name
+// The second argument is the function or object that will be called whenever
+// the node is used.
+graphBuilder.addNode("chatbot", chatbot);
+graphBuilder.addEdge(START, "chatbot");
+graphBuilder.addEdge("chatbot", END);
+const graph = graphBuilder.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

@@ -10,24 +10,65 @@ 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
-def _set_env(var: str):
-    if not os.environ.get(var):
-        os.environ[var] = getpass.getpass(f"{var}: ")
+:::python
 
+```bash
 _set_env("TAVILY_API_KEY")
 ```
 
@@ -35,10 +76,22 @@ _set_env("TAVILY_API_KEY")
 os.environ["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
 
@@ -47,8 +100,25 @@ 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,
@@ -67,13 +137,51 @@ 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:
 
-{% include-markdown "../../../snippets/chat_model_tabs.md" %}
+{!snippets/chat_model_tabs.md!}
 
 <!---
 ```python
@@ -83,8 +191,22 @@ 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
 
@@ -108,9 +230,31 @@ 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
 
-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
+
+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
@@ -152,16 +296,80 @@ 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.
 
-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. 
+:::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.
+:::
 
 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,
@@ -201,10 +409,61 @@ 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. 
+    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.
+
+:::
 
 ## 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
@@ -217,12 +476,31 @@ 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}]}):
@@ -245,7 +523,7 @@ 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:
@@ -276,18 +554,99 @@ 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)
 
 {% include-markdown "../../../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
@@ -327,7 +686,46 @@ graph_builder.add_edge(START, "chatbot")
 graph = graph_builder.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. 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).
+:::
+
+:::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).
+
+:::
 
 ## 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.
 
@@ -14,43 +14,79 @@ We will see later that **checkpointing** is _much_ more powerful than simple cha
 
 Create a `InMemorySaver` checkpointer:
 
-``` python
+:::python
+
+```python
 from langgraph.checkpoint.memory import InMemorySaver
 
 memory = InMemorySaver()
 ```
 
+:::
+
+:::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
+:::
 
-try:
-    display(Image(graph.get_graph().draw_mermaid_png()))
-except Exception:
-    # This requires some extra dependencies and is optional
-    pass
+:::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 });
 ```
 
+:::
+
 ## 3. Interact with your chatbot
 
 Now you can interact with your bot!
 
-1. Pick a thread to use as the key for this conversation.
+1.  Pick a thread to use as the key for this conversation.
+
+    :::python
 
     ```python
     config = {"configurable": {"thread_id": "1"}}
     ```
 
-2. Call your chatbot:
+    :::
+
+    :::js
+
+    ```typescript
+    const config = { configurable: { thread_id: "1" } };
+    ```
+
+    :::
+
+2.  Call your chatbot:
+
+    :::python
 
     ```python
     user_input = "Hi there! My name is Will."
@@ -74,14 +110,45 @@ 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?"
 
@@ -104,10 +171,37 @@ 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(
@@ -129,10 +223,36 @@ 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
@@ -148,12 +268,94 @@ 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
+
 {% include-markdown "../../../snippets/chat_model_tabs.md" %}
 
 <!---
@@ -204,6 +406,43 @@ memory = InMemorySaver()
 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

@@ -2,7 +2,15 @@
 
 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). `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).
+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).
+:::
 
 !!! note
 
@@ -14,6 +22,7 @@ Starting with the existing code from the [Add memory to the chatbot](./3-add-mem
 
 Let's first select a chat model:
 
+:::python
 {% include-markdown "../../../snippets/chat_model_tabs.md" %}
 
 <!---
@@ -24,9 +33,24 @@ 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 hl_lines="12 19 20 21 22 23"
+:::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
@@ -74,7 +98,103 @@ graph_builder.add_conditional_edges(
 )
 graph_builder.add_edge("tools", "chatbot")
 graph_builder.add_edge(START, "chatbot")
-```
+````
+
+:::
+
+:::js
+
+````typescript hl_lines="12 19 20 21 22 23"
+import { TavilySearchResults } from "@langchain/community/tools/tavily_search";
+
+```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";
+
+import { MemorySaver } from "@langchain/langgraph";
+import {
+  StateGraph,
+  START,
+  END,
+  MessagesAnnotation,
+} from "@langchain/langgraph";
+import { ToolNode } from "@langchain/langgraph/prebuilt";
+import { ChatAnthropic } from "@langchain/anthropic";
+
+import { Command, interrupt } from "@langchain/langgraph";
+
+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 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] };
+}
+
+const graphBuilder = new StateGraph(MessagesAnnotation).addNode(
+  "chatbot",
+  chatbot
+);
+
+const toolNode = new ToolNode(tools);
+graphBuilder.addNode("tools", toolNode);
+
+const shouldContinue = (state: typeof MessagesAnnotation.State) => {
+  const messages = state.messages;
+  const lastMessage = messages[messages.length - 1];
+  if ("tool_calls" in lastMessage && lastMessage.tool_calls?.length) {
+    return "tools";
+  }
+  return END;
+};
+
+graphBuilder.addConditionalEdges("chatbot", shouldContinue);
+graphBuilder.addEdge("tools", "chatbot");
+graphBuilder.addEdge(START, "chatbot");
+````
+
+:::
 
 !!! tip
 
@@ -84,17 +204,39 @@ graph_builder.add_edge(START, "chatbot")
 
 We compile the graph with a checkpointer, as before:
 
+:::python
+
 ```python
 memory = InMemorySaver()
 
 graph = graph_builder.compile(checkpointer=memory)
 ```
 
+:::
+
+:::js
+
+```typescript
+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:
@@ -104,12 +246,30 @@ 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"}}
@@ -138,8 +298,60 @@ 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
+const userInput =
+  "I need some expert guidance for building an AI agent. Could you request assistance for me?";
+const config = {
+  configurable: { thread_id: "1" },
+  streamMode: "values" as const,
+};
+
+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
@@ -149,8 +361,28 @@ snapshot.next
 ('tools',)
 ```
 
+:::
+
+:::js
+
+```typescript
+const snapshot = await graph.getState({ configurable: { thread_id: "1" } });
+snapshot.next;
+```
+
+```json
+["tools"]
+```
+
+['tools']
+
+````
+:::
+
 !!! info Additional information
 
+    :::python
+
     Take a closer look at the `human_assistance` tool:
 
     ```python
@@ -162,12 +394,40 @@ 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. For this example, use a dict with a key `"data"`:
+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.
 
-``` python
+:::python
+
+For this example, use a dict with a key `"data"`:
+
+```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."
@@ -179,7 +439,7 @@ events = graph.stream(human_command, config, stream_mode="values")
 for event in events:
     if "messages" in event:
         event["messages"][-1].pretty_print()
-```
+````
 
 ```
 ================================== Ai Message ==================================
@@ -215,13 +475,58 @@ 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
+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:
 
-{% include-markdown "../../../snippets/chat_model_tabs.md" %}
+:::python
+{!snippets/chat_model_tabs.md!}
 
 ```python
 from typing import Annotated
@@ -272,6 +577,94 @@ memory = InMemorySaver()
 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 graphBuilder = new StateGraph(MessagesAnnotation).addNode(
+  "chatbot",
+  chatbot
+);
+
+const toolNode = new ToolNode(tools);
+graphBuilder.addNode("tools", toolNode);
+
+const shouldContinue = (state: typeof MessagesAnnotation.State) => {
+  const messages = state.messages;
+  const lastMessage = messages[messages.length - 1];
+  if ("tool_calls" in lastMessage && lastMessage.tool_calls?.length) {
+    return "tools";
+  }
+  return END;
+};
+
+graphBuilder.addConditionalEdges("chatbot", shouldContinue);
+graphBuilder.addEdge("tools", "chatbot");
+graphBuilder.addEdge(START, "chatbot");
+
+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

@@ -10,6 +10,8 @@ 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
 
@@ -26,13 +28,34 @@ 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
 
@@ -76,10 +99,78 @@ 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
@@ -99,6 +190,51 @@ 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 =================================
 
@@ -126,12 +262,20 @@ 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={
@@ -146,6 +290,53 @@ 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 ==================================
 
@@ -175,6 +366,8 @@ 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)
 
@@ -185,13 +378,34 @@ 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)"})
 ```
 
@@ -201,11 +415,36 @@ 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")}
@@ -215,12 +454,35 @@ 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
+
 {% include-markdown "../../../snippets/chat_model_tabs.md" %}
 
 <!---
@@ -305,7 +567,111 @@ memory = InMemorySaver()
 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
 
@@ -12,7 +12,15 @@ 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
 
 {% include-markdown "../../../snippets/chat_model_tabs.md" %}
 
@@ -64,11 +72,49 @@ memory = InMemorySaver()
 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(
     {
@@ -159,7 +205,7 @@ 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:
@@ -177,11 +223,140 @@ 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)
@@ -214,10 +389,61 @@ 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.
+:::
+
+:::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.
 
 ## 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
@@ -230,12 +456,37 @@ 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:
@@ -254,19 +505,16 @@ 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 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:
+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:
 
-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.
+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.
 
-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.
+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.
 
-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.
+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.
 ...
 
 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.
@@ -275,7 +523,83 @@ 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 `action` 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 `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.
+:::
 
 **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.
 
@@ -285,4 +609,4 @@ 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.