How to integrate Notion MCP with LangChain

This guide walks you through connecting Notion to LangChain using the Composio tool router. By the end, you'll have a working Notion agent that can add meeting notes to project wiki page, create a new task database for q3, archive completed sprint summary pages through natural language commands. This guide will help you understand how to give your LangChain agent real control over a Notion account through Composio's Notion MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Notion is a collaborative workspace for notes, docs, wikis, and tasks. It streamlines team knowledge, project tracking, and workflow customization in one place.

45 Tools13 Triggers

Introduction

This guide walks you through connecting Notion to LangChain using the Composio tool router. By the end, you'll have a working Notion agent that can add meeting notes to project wiki page, create a new task database for q3, archive completed sprint summary pages through natural language commands.

This guide will help you understand how to give your LangChain agent real control over a Notion account through Composio's Notion MCP server.

Before we dive in, let's take a quick look at the key ideas and tools involved.

Also integrate Notion with

ChatGPTOpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenCodeCursorVS CodeOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your Notion project to Composio
  • Create a Tool Router MCP session for Notion
  • Initialize an MCP client and retrieve Notion tools
  • Build a LangChain agent that can interact with Notion
  • Set up an interactive chat interface for testing

What is LangChain?

LangChain is a framework for developing applications powered by language models. It provides tools and abstractions for building agents that can reason, use tools, and maintain conversation context.

Key features include:

  • Agent Framework: Build agents that can use tools and make decisions
  • MCP Integration: Connect to external services through Model Context Protocol adapters
  • Memory Management: Maintain conversation history across interactions
  • Multi-Provider Support: Works with OpenAI, Anthropic, and other LLM providers

What is the Notion MCP server, and what's possible with it?

The Notion MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Notion account. It provides structured and secure access to your notes, docs, wikis, and tasks, so your agent can perform actions like creating pages, managing databases, adding content, commenting, and organizing your Notion workspace for you.

  • Bulk content creation and formatting: Let your agent efficiently add and format multiple blocks of text, lists, or markdown content to Notion pages in one go.
  • Automated page and database management: Have your agent create new pages, duplicate existing ones, or set up entire databases with custom properties—no manual setup required.
  • Smart commenting and collaboration: Enable your agent to add comments to pages or discussion threads, making real-time collaboration smoother.
  • Workspace organization and cleanup: Ask your agent to archive, delete, or restore pages and blocks, keeping your workspace tidy and up to date.
  • Deep block and structure retrieval: Direct your agent to fetch metadata, list child blocks, or dig into nested content for analysis, reporting, or workflow automation.

What is the Composio tool router, and how does it fit here?

What is Composio SDK?

Composio's Composio SDK helps agents find the right tools for a task at runtime. You can plug in multiple toolkits (like Gmail, HubSpot, and GitHub), and the agent will identify the relevant app and action to complete multi-step workflows. This can reduce token usage and improve the reliability of tool calls. Read more here: Getting started with Composio SDK

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Composio SDK works

The Composio SDK follows a three-phase workflow:

  1. Discovery: Searches for tools matching your task and returns relevant toolkits with their details.
  2. Authentication: Checks for active connections. If missing, creates an auth config and returns a connection URL via Auth Link.
  3. Execution: Executes the action using the authenticated connection.

Step-by-step Guide

Step by step10 STEPS
1

Prerequisites

Before starting this tutorial, make sure you have:
  • Python 3.10 or higher installed on your system
  • A Composio account with an API key
  • An OpenAI API key
  • Basic familiarity with Python and async programming
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key. You'll need credits to use the models, or you can connect to another model provider.
  • Keep the API key safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Navigate to your API settings and generate a new API key.
  • Store this key securely as you'll need it for authentication.
3

Install dependencies

npm install @composio/langchain @langchain/core @langchain/openai @langchain/mcp-adapters dotenv

Install the required packages for LangChain with MCP support.

What's happening:

  • @composio/langchain provides Composio integration for LangChain
  • @langchain/mcp-adapters enables MCP client connections
  • @langchain/core is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_composio_user_id_here
OPENAI_API_KEY=your_openai_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates your requests to Composio's API
  • COMPOSIO_USER_ID identifies the user for session management
  • OPENAI_API_KEY enables access to OpenAI's language models
5

Import dependencies

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

dotenv.config();
What's happening:
  • We're importing LangChain's MCP adapter and Composio SDK
  • The dotenv/config import loads environment variables from your .env file
  • This setup prepares the foundation for connecting LangChain with Notion functionality through MCP
6

Initialize Composio client

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });
What's happening:
  • We're loading the COMPOSIO_API_KEY from environment variables and validating it exists
  • Creating a Composio instance that will manage our connection to Notion tools
  • Validating that COMPOSIO_USER_ID is also set before proceeding
7

Create a Tool Router session

const session = await composio.create(
    userId as string,
    {
        toolkits: ['notion']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to Notion tools
  • The create method takes the user ID and specifies which toolkits should be available
  • The returned session.mcp.url is the MCP server URL that your agent will use
  • This approach allows the agent to dynamically load and use Notion tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "notion-agent": {
        transport: "http",
        url: url,
        headers: {
            "x-api-key": process.env.COMPOSIO_API_KEY
        }
    }
});

const tools = await client.getTools();

const agent = createAgent({ model: "gpt-5", tools });
What's happening:
  • We're creating a MultiServerMCPClient that connects to our Notion MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available Notion tools that the agent can use
  • We're creating a LangChain agent using the GPT-5 model
9

Set up interactive chat interface

let conversationHistory: any[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
console.log("Ask any Notion related question or task to the agent.\n");

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout,
    prompt: 'You: '
});

rl.prompt();

rl.on('line', async (userInput: string) => {
    const trimmedInput = userInput.trim();

    if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
        console.log("\nGoodbye!");
        rl.close();
        process.exit(0);
    }

    if (!trimmedInput) {
        rl.prompt();
        return;
    }

    conversationHistory.push({ role: "user", content: trimmedInput });
    console.log("\nAgent is thinking...\n");

    const response = await agent.invoke({ messages: conversationHistory });
    conversationHistory = response.messages;

    const finalResponse = response.messages[response.messages.length - 1]?.content;
    console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\n👋 Session ended.');
        process.exit(0);
    });
What's happening:
  • We initialize an empty conversationHistory list to maintain context across interactions
  • A readline interface is used to continuously accept user input from the command line
  • When a user types a message, it's added to the conversation history and sent to the agent
  • The agent processes the request using the invoke() method with the full conversation history
  • Users can type 'exit', 'quit', or 'bye' to end the chat session gracefully
10

Run the application

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});
What's happening:
  • We call the main() function to start the application

Complete Code

Here's the complete code to get you started with Notion and LangChain:

import { Composio } from '@composio/core';
import { LangchainProvider } from '@composio/langchain';
import { MultiServerMCPClient } from "@langchain/mcp-adapters";  
import { createAgent } from "langchain";
import * as readline from 'readline';
import 'dotenv/config';

const composioApiKey = process.env.COMPOSIO_API_KEY;
const userId = process.env.COMPOSIO_USER_ID;

if (!composioApiKey) throw new Error('COMPOSIO_API_KEY is not set');
if (!userId) throw new Error('COMPOSIO_USER_ID is not set');

async function main() {
    const composio = new Composio({
        apiKey: composioApiKey as string,
        provider: new LangchainProvider()
    });

    const session = await composio.create(
        userId as string,
        {
            toolkits: ['notion']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "notion-agent": {
            transport: "http",
            url: url,
            headers: {
                "x-api-key": process.env.COMPOSIO_API_KEY
            }
        }
    });
    
    const tools = await client.getTools();
  
    const agent = createAgent({ model: "gpt-5", tools });
    
    let conversationHistory: any[] = [];
    
    console.log("Chat started! Type 'exit' or 'quit' to end the conversation.\n");
    console.log("Ask any Notion related question or task to the agent.\n");
    
    const rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout,
        prompt: 'You: '
    });

    rl.prompt();

    rl.on('line', async (userInput: string) => {
        const trimmedInput = userInput.trim();
        
        if (['exit', 'quit', 'bye'].includes(trimmedInput.toLowerCase())) {
            console.log("\nGoodbye!");
            rl.close();
            process.exit(0);
        }
        
        if (!trimmedInput) {
            rl.prompt();
            return;
        }
        
        conversationHistory.push({ role: "user", content: trimmedInput });
        console.log("\nAgent is thinking...\n");
        
        const response = await agent.invoke({ messages: conversationHistory });
        conversationHistory = response.messages;
        
        const finalResponse = response.messages[response.messages.length - 1]?.content;
        console.log(`Agent: ${finalResponse}\n`);
        
        rl.prompt();
    });

    rl.on('close', () => {
        console.log('\nSession ended.');
        process.exit(0);
    });
}

main().catch((err) => {
    console.error('Fatal error:', err);
    process.exit(1);
});

Conclusion

You've successfully built a LangChain agent that can interact with Notion through Composio's Tool Router.

Key features of this implementation:

  • Dynamic tool loading through Composio's Tool Router
  • Conversation history maintenance for context-aware responses
  • Async Python provides clean, efficient execution of agent workflows
You can extend this further by adding error handling, implementing specific business logic, or integrating additional Composio toolkits to create multi-app workflows.
TOOLS & TRIGGERS

Supported Tools and Triggers

Every Notion action and event your agent gets out of the box.

Add multiple content blocks (bulk, user-friendly)

Bulk-add content blocks to Notion.

Append code blocks (code, quote, equation)

Append code and technical blocks (code, quote, equation) to a Notion page.

Append layout blocks (divider, TOC, columns)

Append layout blocks (divider, TOC, breadcrumb, columns) to a Notion page.

Append media blocks (image, video, audio, files)

Append media blocks (image, video, audio, file, pdf, embed, bookmark) to a Notion page.

Append table blocks

Append table blocks to a Notion page.

Append task blocks (to-do, toggle, callout)

Append task blocks (to-do, toggle, callout) to a Notion page or block.

Append text blocks (paragraphs, headings, lists)

Append text blocks (paragraphs, headings, lists) to a Notion page.

Archive Notion Page

Archives (moves to trash) or unarchives (restores from trash) a specified Notion page.

Create comment

Adds a comment to a Notion page (via `parent_page_id`) OR to an existing discussion thread (via `discussion_id`); cannot create new discussion threads on specific blocks (inline comments).

Create Notion Database

Creates a new Notion database as a subpage under a specified parent page with a defined properties schema.

Create Notion file upload

Tool to create a Notion FileUpload object and retrieve an upload URL.

Create Notion page

Creates a new page in a Notion workspace under a specified parent page or database.

Delete a block

Archives a Notion block, page, or database using its ID, which sets its 'archived' property to true (like moving to "Trash" in the UI) and allows it to be restored later.

Duplicate page

Duplicates a Notion page, including all its content, properties, and nested blocks, under a specified parent page or workspace.

Fetch All Notion Block Contents

Tool to fetch all child blocks for a given Notion block.

Fetch Notion Block Children

Retrieves a paginated list of direct, first-level child block objects along with contents for a given parent Notion block or page ID; use block IDs from the response for subsequent calls to access deeply nested content.

Fetch Notion block metadata

Fetches metadata for a Notion block (including pages, which are special blocks) using its UUID.

Fetch comments

Fetches unresolved comments for a specified Notion block or page ID.

Fetch Notion Data

Fetches Notion items (pages and/or databases) from the Notion workspace, use this to get minimal data about the items in the workspace with a query or list all items in the workspace with minimal data

Fetch Database

Fetches a Notion database's structural metadata (properties, title, etc.

Fetch database row

Retrieves a Notion database row's properties and metadata; use fetch_block_contents for page content blocks.

Get about user

Retrieves detailed information about a specific Notion user, such as their name, avatar, and email, based on their unique user ID.

Get page markdown

Retrieve a Notion page's full content rendered as Notion-flavored Markdown in a single API call.

Get page property

Call this to get a specific property from a Notion page when you have a valid `page_id` and `property_id`; handles pagination for properties returning multiple items.

Insert row database

Creates a new page (row) in a specified Notion database.

Insert Row From Natural Language

Creates a new row (page) in a Notion database from a natural language description.

List data source templates

Tool to list all templates for a Notion data source.

List Notion file uploads

Tool to retrieve file uploads for the current bot integration, sorted by most recent first.

List users

Retrieves a paginated list of users (excluding guests) from the Notion workspace; the number of users returned per page may be less than the requested `page_size`.

Move Page

Tool to move a Notion page to a new parent (page or database).

Query database

Queries a Notion database to retrieve pages (rows).

Query database with filter

Tool to query a Notion database with server-side filtering, sorting, and pagination.

Query data source

Tool to query a Notion data source.

Replace page content (with backup)

Safely replaces a page's child blocks by optionally backing up current content, deleting existing children, then appending new children in batches.

Retrieve Comment

Tool to retrieve a specific comment by its ID.

Retrieve Database Property

Tool to retrieve a specific property object of a Notion database.

Retrieve Notion file upload

Tool to retrieve details of a Notion File Upload object by its identifier.

Retrieve page

Retrieve a Notion page's properties/metadata (not block content) by page_id.

Search Notion pages and databases

Searches Notion pages and databases by title.

Send file upload

Tool to transmit file contents to Notion for a file upload object.

Update block

Updates existing Notion block's text content.

Update Page

Update page properties, icon, cover, or archive status.

Update Database Row (Page)

Updates a specific row/page within a Notion database by its page UUID (row_id).

Update database schema

Updates an existing Notion database's schema including title, description, and/or properties (columns).

Upsert database rows

Tool to upsert rows in a Notion database by querying for existing rows and creating or updating them.

FRAMEWORKS

How to build Notion MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Notion MCP with ChatGPT

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Notion MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Notion MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Notion MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Notion MCP with Claude Cowork

Codex logo

Codex

Use Notion MCP with Codex

Cursor logo

Cursor

Use Notion MCP with Cursor

OpenClaw logo

OpenClaw

Use Notion MCP with OpenClaw

Hermes logo

Hermes

Use Notion MCP with Hermes

CLI logo

CLI

Use Notion MCP with CLI

Google ADK logo

Google ADK

Use Notion MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use Notion MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Notion MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Notion MCP with LlamaIndex

CrewAI logo

CrewAI

Use Notion MCP with CrewAI

OpenCode logo

OpenCode

Use Notion MCP with OpenCode

VS Code logo

VS Code

Use Notion MCP with VS Code

FAQ

Frequently asked questions

With a standalone Notion MCP server, the agents and LLMs can only access a fixed set of Notion tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Notion and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. LangChain fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Notion tools.

Yes, absolutely. You can configure which Notion scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Notion data and credentials are handled as safely as possible.

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Karan skipped his own birthday party to fix our critical issue. It was 10pm and he diverted his Waymo to help us instead. This really sets the bar — it shows the commitment you need when users rely on your software.

Harsha Gaddipati
Harsha Gaddipati
Co-founder, Slashy

A lot of students tell us that the moment their connected tools start talking to each other inside Opennote feels almost magical. The agent just knows them, and it's immensely helped keep new users on the platform.

Abhi Arya
Abhi Arya
Co-founder, Opennote

We chose Composio over Pipedream because it delivered depth where it mattered — niche tools and tricky edge cases other platforms simply ignored. That gave us confidence to scale without compromising.

Nirman Dave
Nirman Dave
CEO, Zams

As a solo builder, shipping fast is life or death. The only way I can outcompete incumbents is by outmanoeuvring them. Getting bogged down managing agent auth would have been a death sentence.

Ryan Yu
Ryan Yu
Founder, Extra Thursday

Before Composio, adding tool integrations was slow and resource-intensive. Each one could take weeks of engineering time, and maintaining them meant constantly keeping up with API changes.

Tomisin Jenrola
Tomisin Jenrola
Founder & CEO, SwarmZero

With hands-on help from their founder, we integrated Gmail and Google Drive in just 30 minutes. This level of personal support and commitment is exactly what startups should strive for.

Jerome Leclanche
Jerome Leclanche
Co-Founder, Ingram Technologies