How to integrate YouTube Transcript MCP with LangChain

This guide walks you through connecting YouTube Transcript to LangChain using the Composio tool router. By the end, you'll have a working YouTube Transcript agent that can fetch video transcripts, fetch transcripts in batches, list stored transcripts, and check transcript languages through natural language commands. This guide will help you understand how to give your LangChain agent real control over a YouTube Transcript account through Composio's YouTube Transcript MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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YouTube Transcript logoYouTube Transcript
Api Key

YouTube Transcript is a REST API for retrieving, storing, and reading YouTube video captions and transcript metadata. Use it to turn YouTube videos, playlists, and channels into searchable transcript data.

9 Tools

Introduction

This guide walks you through connecting YouTube Transcript to LangChain using the Composio tool router. By the end, you'll have a working YouTube Transcript agent that can fetch video transcripts, fetch transcripts in batches, list stored transcripts, and check transcript languages through natural language commands.

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

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

Also integrate YouTube Transcript with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKVercel AI SDKMastra AILlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Get and set up your OpenAI and Composio API keys
  • Connect your YouTube Transcript project to Composio
  • Create a Tool Router MCP session for YouTube Transcript
  • Initialize an MCP client and retrieve YouTube Transcript tools
  • Build a LangChain agent that can interact with YouTube Transcript
  • 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 YouTube Transcript MCP server, and what's possible with it?

The YouTube Transcript MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your YouTube Transcript account. It provides structured and secure access to video captions, stored transcripts, processing statuses, available languages, and playlist or channel video details, so your agent can retrieve captions, monitor transcription work, search saved transcripts, inspect language options, and find videos from playlists or channels on your behalf.

  • Single video transcription: Have your agent fetch captions for a YouTube video and save the resulting transcript to your account.
  • Batch caption retrieval: Direct your agent to retrieve and store captions for a group of up to 10 YouTube videos.
  • Transcription status checks: Let the agent check whether individual or batch transcription work is processing, complete, failed, or waiting for speech recognition confirmation.
  • Stored transcript access: Instruct your agent to list, search, and read transcripts already saved in your account without starting new transcription work.
  • Language and video discovery: Have your agent review stored and translation languages for a transcript, or find video details from a YouTube playlist or channel.

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 YouTube Transcript 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 YouTube Transcript 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: ['youtube_transcript']
    }
);

const url = session.mcp.url;
What's happening:
  • We're creating a Tool Router session that gives your agent access to YouTube Transcript 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 YouTube Transcript tools as needed
8

Configure the agent with the MCP URL

const client = new MultiServerMCPClient({
    "youtube_transcript-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 YouTube Transcript MCP server via HTTP
  • The client is configured with a name and the URL from our Tool Router session
  • getTools() retrieves all available YouTube Transcript 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 YouTube Transcript 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 YouTube Transcript 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: ['youtube_transcript']
        }
    );

    const url = session.mcp.url;
    
    const client = new MultiServerMCPClient({
        "youtube_transcript-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 YouTube Transcript 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 YouTube Transcript 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

Supported Tools

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

Get Stored Transcript

Read a transcript already stored in the connected account without submitting new transcription work or consuming retrieval credits.

Get Video Transcript

Fetch captions for one YouTube video and store the resulting transcript in the connected account.

Get Video Transcript Job Status

Read one transcript job's current processing, completed, failed, or requires-ASR-confirmation state without creating work or waiting.

Get Video Transcripts Batch

Fetch and store captions for 1-10 YouTube videos.

Get Video Transcripts Batch Status

Read the current state and available per-video results for a transcript batch without creating work or waiting.

List Stored Transcripts

List and search transcripts already stored in the connected account, one bounded page at a time.

List Transcript Languages

List stored languages and YouTube translation target languages for one owned video transcript.

Resolve Channel Videos

Requires Basic or higher.

Resolve Playlist Videos

Requires Basic or higher.

FRAMEWORKS

How to build YouTube Transcript MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use YouTube Transcript MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use YouTube Transcript MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use YouTube Transcript MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use YouTube Transcript MCP with Claude Cowork

Codex logo

Codex

Use YouTube Transcript MCP with Codex

OpenClaw logo

OpenClaw

Use YouTube Transcript MCP with OpenClaw

Hermes logo

Hermes

Use YouTube Transcript MCP with Hermes

CLI logo

CLI

Use YouTube Transcript MCP with CLI

Google ADK logo

Google ADK

Use YouTube Transcript MCP with Google ADK

Vercel AI SDK logo

Vercel AI SDK

Use YouTube Transcript MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use YouTube Transcript MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use YouTube Transcript MCP with LlamaIndex

CrewAI logo

CrewAI

Use YouTube Transcript MCP with CrewAI

FAQ

Frequently asked questions

With a standalone YouTube Transcript MCP server, the agents and LLMs can only access a fixed set of YouTube Transcript tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from YouTube Transcript 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 YouTube Transcript tools.

Yes, absolutely. You can configure which YouTube Transcript 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 YouTube Transcript data and credentials are handled as safely as possible.

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