How to integrate Studio By Ai21 Labs MCP with Mastra AI

This guide walks you through connecting Studio By Ai21 Labs to Mastra AI using the Composio tool router. By the end, you'll have a working Studio By Ai21 Labs agent that can generate a summary of this research paper, classify sentiment of this product review, extract key topics from meeting transcript through natural language commands. This guide will help you understand how to give your Mastra AI agent real control over a Studio By Ai21 Labs account through Composio's Studio By Ai21 Labs MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Introduction

This guide walks you through connecting Studio By Ai21 Labs to Mastra AI using the Composio tool router. By the end, you'll have a working Studio By Ai21 Labs agent that can generate a summary of this research paper, classify sentiment of this product review, extract key topics from meeting transcript through natural language commands.

This guide will help you understand how to give your Mastra AI agent real control over a Studio By Ai21 Labs account through Composio's Studio By Ai21 Labs MCP server.

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

Also integrate Studio By Ai21 Labs with

OpenAI Agents SDKClaude Agent SDKClaude CodeClaude CoworkCodexOpenClawHermesCLIGoogle ADKLangChainVercel AI SDKLlamaIndexCrewAI

TL;DR

Here's what you'll learn:
  • Set up your environment so Mastra, OpenAI, and Composio work together
  • Create a Tool Router session in Composio that exposes Studio By Ai21 Labs tools
  • Connect Mastra's MCP client to the Composio generated MCP URL
  • Fetch Studio By Ai21 Labs tool definitions and attach them as a toolset
  • Build a Mastra agent that can reason, call tools, and return structured results
  • Run an interactive CLI where you can chat with your Studio By Ai21 Labs agent

What is Mastra AI?

Mastra AI is a TypeScript framework for building AI agents with tool support. It provides a clean API for creating agents that can use external services through MCP.

Key features include:

  • MCP Client: Built-in support for Model Context Protocol servers
  • Toolsets: Organize tools into logical groups
  • Step Callbacks: Monitor and debug agent execution
  • OpenAI Integration: Works with OpenAI models via @ai-sdk/openai

What is the Studio By Ai21 Labs MCP server, and what's possible with it?

The Studio By Ai21 Labs MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Studio By Ai21 Labs account. It provides structured and secure access so your agent can perform Studio By Ai21 Labs operations on your behalf.

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 step09 STEPS
1

Prerequisites

Before starting, make sure you have:
  • Node.js 18 or higher
  • A Composio account with an active API key
  • An OpenAI API key
  • Basic familiarity with TypeScript
2

Getting API Keys for OpenAI and Composio

OpenAI API Key
  • Go to the OpenAI dashboard and create an API key.
  • You need credits or a connected billing setup to use the models.
  • Store the key somewhere safe.
Composio API Key
  • Log in to the Composio dashboard.
  • Go to Settings and copy your API key.
  • This key lets your Mastra agent talk to Composio and reach Studio By Ai21 Labs through MCP.
3

Install dependencies

bash
npm install @composio/core @mastra/core @mastra/mcp @ai-sdk/openai dotenv

Install the required packages.

What's happening:

  • @composio/core is the Composio SDK for creating MCP sessions
  • @mastra/core provides the Agent class
  • @mastra/mcp is Mastra's MCP client
  • @ai-sdk/openai is the model wrapper for OpenAI
  • dotenv loads environment variables from .env
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
COMPOSIO_USER_ID=your_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
  • COMPOSIO_USER_ID tells Composio which user this session belongs to
  • OPENAI_API_KEY lets the Mastra agent call OpenAI models
5

Import libraries and validate environment

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({
  apiKey: composioAPIKey as string,
});
What's happening:
  • dotenv/config auto loads your .env so process.env.* is available
  • openai gives you a Mastra compatible model wrapper
  • Agent is the Mastra agent that will call tools and produce answers
  • MCPClient connects Mastra to your Composio MCP server
  • Composio is used to create a Tool Router session
6

Create a Tool Router session for Studio By Ai21 Labs

typescript
async function main() {
  const session = await composio.create(
    composioUserID as string,
    {
      toolkits: ["studio_by_ai21_labs"],
    },
  );

  const composioMCPUrl = session.mcp.url;
  console.log("Studio By Ai21 Labs MCP URL:", composioMCPUrl);
What's happening:
  • create spins up a short-lived MCP HTTP endpoint for this user
  • The toolkits array contains "studio_by_ai21_labs" for Studio By Ai21 Labs access
  • session.mcp.url is the MCP URL that Mastra's MCPClient will connect to
7

Configure Mastra MCP client and fetch tools

typescript
const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      nasdaq: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

console.log("Fetching MCP tools from Composio...");
const composioTools = await mcpClient.getTools();
console.log("Number of tools:", Object.keys(composioTools).length);
What's happening:
  • MCPClient takes an id for this client and a list of MCP servers
  • The headers property includes the x-api-key for authentication
  • getTools fetches the tool definitions exposed by the Studio By Ai21 Labs toolkit
8

Create the Mastra agent

typescript
const agent = new Agent({
    name: "studio_by_ai21_labs-mastra-agent",
    instructions: "You are an AI agent with Studio By Ai21 Labs tools via Composio.",
    model: "openai/gpt-5",
  });
What's happening:
  • Agent is the core Mastra agent
  • name is just an identifier for logging and debugging
  • instructions guide the agent to use tools instead of only answering in natural language
  • model uses openai("gpt-5") to configure the underlying LLM
9

Set up interactive chat interface

typescript
let messages: AiMessageType[] = [];

console.log("Chat started! Type 'exit' or 'quit' to end.\n");

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

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;
  }

  messages.push({
    id: crypto.randomUUID(),
    role: "user",
    content: trimmedInput,
  });

  console.log("\nAgent is thinking...\n");

  try {
    const response = await agent.generate(messages, {
      toolsets: {
        studio_by_ai21_labs: composioTools,
      },
      maxSteps: 8,
    });

    const { text } = response;

    if (text && text.trim().length > 0) {
      console.log(`Agent: ${text}\n`);
        messages.push({
          id: crypto.randomUUID(),
          role: "assistant",
          content: text,
        });
      }
    } catch (error) {
      console.error("\nError:", error);
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    console.log("\nSession ended.");
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main().catch((err) => {
  console.error("Fatal error:", err);
  process.exit(1);
});
What's happening:
  • messages keeps the full conversation history in Mastra's expected format
  • agent.generate runs the agent with conversation history and Studio By Ai21 Labs toolsets
  • maxSteps limits how many tool calls the agent can take in a single run
  • onStepFinish is a hook that prints intermediate steps for debugging

Complete Code

Here's the complete code to get you started with Studio By Ai21 Labs and Mastra AI:

typescript
import "dotenv/config";
import { openai } from "@ai-sdk/openai";
import { Agent } from "@mastra/core/agent";
import { MCPClient } from "@mastra/mcp";
import { Composio } from "@composio/core";
import * as readline from "readline";

import type { AiMessageType } from "@mastra/core/agent";

const openaiAPIKey = process.env.OPENAI_API_KEY;
const composioAPIKey = process.env.COMPOSIO_API_KEY;
const composioUserID = process.env.COMPOSIO_USER_ID;

if (!openaiAPIKey) throw new Error("OPENAI_API_KEY is not set");
if (!composioAPIKey) throw new Error("COMPOSIO_API_KEY is not set");
if (!composioUserID) throw new Error("COMPOSIO_USER_ID is not set");

const composio = new Composio({ apiKey: composioAPIKey as string });

async function main() {
  const session = await composio.create(composioUserID as string, {
    toolkits: ["studio_by_ai21_labs"],
  });

  const composioMCPUrl = session.mcp.url;

  const mcpClient = new MCPClient({
    id: composioUserID as string,
    servers: {
      studio_by_ai21_labs: {
        url: new URL(composioMCPUrl),
        requestInit: {
          headers: session.mcp.headers,
        },
      },
    },
    timeout: 30_000,
  });

  const composioTools = await mcpClient.getTools();

  const agent = new Agent({
    name: "studio_by_ai21_labs-mastra-agent",
    instructions: "You are an AI agent with Studio By Ai21 Labs tools via Composio.",
    model: "openai/gpt-5",
  });

  let messages: AiMessageType[] = [];

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

  rl.prompt();

  rl.on("line", async (input: string) => {
    const trimmed = input.trim();
    if (["exit", "quit"].includes(trimmed.toLowerCase())) {
      rl.close();
      return;
    }

    messages.push({ id: crypto.randomUUID(), role: "user", content: trimmed });

    const { text } = await agent.generate(messages, {
      toolsets: { studio_by_ai21_labs: composioTools },
      maxSteps: 8,
    });

    if (text) {
      console.log(`Agent: ${text}\n`);
      messages.push({ id: crypto.randomUUID(), role: "assistant", content: text });
    }

    rl.prompt();
  });

  rl.on("close", async () => {
    await mcpClient.disconnect();
    process.exit(0);
  });
}

main();

Conclusion

You've built a Mastra AI agent that can interact with Studio By Ai21 Labs through Composio's Tool Router. You can extend this further by:
  • Adding other toolkits like Gmail, Slack, or GitHub
  • Building a web-based chat interface around this agent
  • Using multiple MCP endpoints to enable cross-app workflows
TOOLS

Supported Tools

Every Studio By Ai21 Labs action and event your agent gets out of the box.

Check Can Iframe

Tool to check if a URL can be embedded in an iframe.

Compare Text

Tool to compare two text strings and identify differences.

Create Aftersales Parts Classification Batch

Tool to create a batch job for Fnac Aftersales parts classification.

Create Assistant Route

Tool to create a new route for an AI21 Studio assistant.

Create Assistant

Tool to create a new AI assistant in AI21 Studio.

Create Assistant Plan

Tool to create a new plan for an AI21 Studio assistant.

Create Demo

Tool to create a new demo in AI21 Studio.

Generate Requirements

Tool to generate requirements from a query or task description.

Generate Thread Name

Tool to generate a thread name from a query or conversation context.

Create Kirsh Grant Compliance Preview

Tool to preview grant compliance for Kirsh grants.

Kirsh Grant Metadata Preview

Tool to retrieve grant metadata from the Kirsh preview endpoint.

Create MCP Storage

Tool to create MCP (Model Context Protocol) storage in AI21 Studio.

Create Secret

Tool to save a secret in AI21 Studio.

Check Kirsh Grant Compliance

Tool to check compliance for Kirsh grant IDs.

Create Website Connector

Tool to create a website connector in AI21 Studio.

Delete Assistant

Tool to delete an assistant by its unique ID.

Delete Assistant Route

Tool to delete a route from an AI21 Studio assistant.

Delete Demo

Tool to delete a demo by its unique ID.

Delete MCP Storage

Tool to delete an MCP (Model Context Protocol) storage configuration by its unique ID.

Delete Secret

Tool to delete a secret by its unique ID.

Delete Website Connector

Permanently delete a website connector by its unique identifier.

Download Modified Document

Tool to download a modified document from AI21 Labs Studio.

Get Assistant

Tool to retrieve an assistant by its unique identifier.

Get Assistant Route

Tool to retrieve details of a specific route for an AI21 Studio assistant.

Get Assistants By MCP

Tool to retrieve all assistants associated with a specific MCP (Model Context Protocol) storage configuration.

Get Batch Prediction Status

Tool to check the status of a Fnac Aftersales parts classification batch prediction job.

Get Demo

Tool to retrieve a demo by its unique ID.

Grant Kirsh Metadata

Tool to retrieve Kirsh grant metadata by grant ID.

Get Library Batch Status

Tool to get the ingestion status of a library batch.

Get MCP Storage

Tool to retrieve a specific MCP (Model Context Protocol) storage configuration by its unique ID.

Get Output Explanation

Tool to get output explanation for an execution (cached or generated).

Get Plan

Tool to retrieve a specific plan from an AI21 Studio assistant.

Get Website Connector By ID

Tool to retrieve details of a specific website connector by its ID.

Get Website Connector Status

Tool to retrieve the status of a website connector ingestion.

Get Website Connector URL Status

Tool to retrieve the status of a specific URL in the website connector.

Ingest Website Connector

Tool to ingest website content via sitemap URL in AI21 Studio.

Ingest Website Connector URL

Tool to ingest a website URL into AI21 Studio's website connector.

List Assistants

Tool to retrieve all assistants from AI21 Studio.

List Website Connectors

Tool to retrieve website connector information from AI21 Studio.

List Demos

Tool to retrieve all demos from AI21 Studio.

List Library Files

Tool to list files in the workspace library with optional filtering.

List MCP Storage

Tool to retrieve all MCP (Model Context Protocol) storage configurations from AI21 Studio.

List Models

Tool to retrieve information about all available AI21 models.

List Plans

Tool to list all plans for a specific assistant.

List Secrets

Tool to retrieve all secrets from AI21 Studio secret storage.

List Workspace Models

Tool to retrieve all workspace models by organization from AI21 Studio.

List Available Models

Tool to retrieve all available models from AI21 Studio settings.

Modify Assistant

Tool to modify an existing AI21 Studio assistant.

Modify Assistant Route

Tool to modify an existing route within an assistant.

Modify Assistant Plan

Tool to modify an existing assistant plan in AI21 Studio.

Retry Ingest Website

Tool to retry ingestion of a website in AI21 Studio.

Run Assistant

Tool to run an AI21 Studio assistant with conversational input.

Sync Website Connector

Tool to sync a website connector in AI21 Studio.

Update Demo

Tool to update an existing demo in Studio by AI21 Labs.

Update MCP Storage

Tool to update an existing MCP (Model Context Protocol) storage configuration in AI21 Studio.

Update Secret

Tool to update an existing secret in AI21 Studio.

Validate Plan

Tool to validate Python code for an AI21 Studio assistant plan.

FRAMEWORKS

How to build Studio By Ai21 Labs MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Studio By Ai21 Labs MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Studio By Ai21 Labs MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Studio By Ai21 Labs MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Studio By Ai21 Labs MCP with Claude Cowork

Codex logo

Codex

Use Studio By Ai21 Labs MCP with Codex

OpenClaw logo

OpenClaw

Use Studio By Ai21 Labs MCP with OpenClaw

Hermes logo

Hermes

Use Studio By Ai21 Labs MCP with Hermes

CLI logo

CLI

Use Studio By Ai21 Labs MCP with CLI

Google ADK logo

Google ADK

Use Studio By Ai21 Labs MCP with Google ADK

LangChain logo

LangChain

Use Studio By Ai21 Labs MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Studio By Ai21 Labs MCP with Vercel AI SDK

LlamaIndex logo

LlamaIndex

Use Studio By Ai21 Labs MCP with LlamaIndex

CrewAI logo

CrewAI

Use Studio By Ai21 Labs MCP with CrewAI

FAQ

Frequently asked questions

With a standalone Studio By Ai21 Labs MCP server, the agents and LLMs can only access a fixed set of Studio By Ai21 Labs tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Studio By Ai21 Labs and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Mastra AI 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 Studio By Ai21 Labs tools.

Yes, absolutely. You can configure which Studio By Ai21 Labs 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 Studio By Ai21 Labs 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.

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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.

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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.

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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.

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