How to integrate Anchor browser MCP with Mastra AI

This guide walks you through connecting Anchor browser to Mastra AI using the Composio tool router. By the end, you'll have a working Anchor browser agent that can fetch full content of a product page, list all active browser sessions now, get details for a specific browser profile through natural language commands. This guide will help you understand how to give your Mastra AI agent real control over a Anchor browser account through Composio's Anchor browser MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Anchor browser is a developer platform for AI-powered web automation. It transforms complex browser actions into easy API endpoints for streamlined web interaction.

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Introduction

This guide walks you through connecting Anchor browser to Mastra AI using the Composio tool router. By the end, you'll have a working Anchor browser agent that can fetch full content of a product page, list all active browser sessions now, get details for a specific browser profile through natural language commands.

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

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

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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 Anchor browser tools
  • Connect Mastra's MCP client to the Composio generated MCP URL
  • Fetch Anchor browser 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 Anchor browser 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 Anchor browser MCP server, and what's possible with it?

The Anchor browser MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Anchor browser account. It provides structured and secure access to powerful web automation features, so your agent can fetch web content, manage browser sessions, control profiles, and interact with extensions on your behalf.

  • Automated webpage content retrieval: Instruct your agent to browse to any URL and fetch the fully rendered page content in HTML or markdown, enabling easy scraping or summarization.
  • Session and profile management: Let your agent create, list, or delete browser profiles, as well as start, end, or monitor multiple browsing sessions for different workflows or user contexts.
  • Browser extension control: Have the agent list all installed browser extensions, making it easy to audit and manage your browser environment programmatically.
  • Resource and file listing: Ask your agent to retrieve a list of files or resources uploaded during browser automation tasks, ensuring nothing gets lost in the shuffle.
  • Comprehensive session oversight: Quickly get an overview of all active browser sessions, their statuses, and terminate any or all sessions instantly for security or resource management needs.

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 Anchor browser 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 Anchor browser

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

  const composioMCPUrl = session.mcp.url;
  console.log("Anchor browser MCP URL:", composioMCPUrl);
What's happening:
  • create spins up a short-lived MCP HTTP endpoint for this user
  • The toolkits array contains "anchor_browser" for Anchor browser 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 Anchor browser toolkit
8

Create the Mastra agent

typescript
const agent = new Agent({
    name: "anchor_browser-mastra-agent",
    instructions: "You are an AI agent with Anchor browser 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: {
        anchor_browser: 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 Anchor browser 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 Anchor browser 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: ["anchor_browser"],
  });

  const composioMCPUrl = session.mcp.url;

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

  const composioTools = await mcpClient.getTools();

  const agent = new Agent({
    name: "anchor_browser-mastra-agent",
    instructions: "You are an AI agent with Anchor browser 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: { anchor_browser: 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 Anchor browser 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 Anchor browser action and event your agent gets out of the box.

Click Mouse

Tool to perform a mouse click at specified coordinates within a browser session.

Copy Selected Text

Tool to copy currently selected text in a browser session to the clipboard.

Create Integration

Tool to create a new integration with a third-party service like 1Password.

Create or Update Task Draft

Tool to create or update the draft version of a task.

Create Profile

Creates a new browser profile from an active session.

Create Task

Tool to create a new task or update an existing task with the same name.

Delete Extension

Tool to delete a browser extension and remove it from storage.

Delete Integration

Tool to delete an existing integration and remove its stored credentials.

Delete Profile

Tool to delete a browser profile by ID.

Delete Task

Tool to soft delete a task and all its versions.

Delete Task Version

Tool to soft delete a specific version of a task.

Deploy Task

Tool to deploy a task by creating a new version with auto-incremented version number.

Double Click Mouse

Tool to perform a double click at specified coordinates in a browser session.

Drag and Drop

Tool to perform a drag and drop operation from start coordinates to end coordinates within a browser session.

End All Sessions

Tool to terminate all active browser sessions at once.

End Browser Session

Tool to end a specific browser session by ID.

Get Batch Session Status

Tool to retrieve detailed status information for a specific batch including progress and errors.

Get Browser Session

Tool to retrieve detailed information about a specific browser session.

Get Clipboard Content

Tool to retrieve the current content of the clipboard from a browser session.

Get Latest Task Version

Tool to retrieve the latest version of a task including the full base64 encoded code content.

Get Profile (v2)

Tool to retrieve details of a specific profile by its name.

Get Session Pages

Tool to retrieve all pages associated with a specific browser session.

Get Task Draft

Tool to retrieve the draft version of a task, including the full Base64 encoded code content.

Get Task Execution Result

Tool to retrieve a single task execution result by its ID.

Get Task Metadata

Tool to retrieve task metadata without downloading the full task code.

Get Task Version

Tool to retrieve a specific version of a task, including the full code content.

Get Webpage Content

Tool to retrieve rendered content of a webpage in HTML or Markdown format.

List Agent Resources

List all agent resources (files) uploaded to a browser session.

List Extensions

Retrieves all browser extensions uploaded by the authenticated user.

List Integrations

Tool to retrieve all integrations for the authenticated team.

List Profiles

Tool to fetch all stored browser profiles.

List Session Downloads

Tool to retrieve metadata of files downloaded during a browser session.

List Session Recordings

Tool to list all recordings for a specific browser session.

List Sessions

Tool to list all browser sessions.

List Task Executions

Tool to retrieve execution history for a specific task with filtering and pagination support.

List Tasks

Tool to retrieve a paginated list of all tasks for the authenticated team.

List Task Versions

Tool to retrieve all versions of a specific task, including draft and published versions.

Mouse Move

Tool to move the mouse cursor to specified coordinates within a browser session.

Navigate to URL

Tool to navigate a browser session to a specified URL.

Paste Text

Tool to paste text at the current cursor position in a browser session.

Pause Agent

Tool to pause the AI agent for a specific browser session.

Pause Session Recording

Tool to pause the video recording for a specific browser session.

Perform Keyboard Shortcut

Tool to perform a keyboard shortcut using specified keys in a browser session.

Perform Web Task

Tool to perform autonomous web tasks using AI agents.

Mouse Down

Tool to perform a mouse button down action at specified coordinates within a browser session.

Publish Task Version

Tool to publish a specific version of a task.

Release Mouse Button

Tool to release a mouse button at specified coordinates within a browser session.

Resume Agent

Tool to resume the AI agent for a specific browser session.

Resume Session Recording

Tool to resume video recording for a specific browser session.

Run Task

Tool to execute a task in a browser session with a specific or latest version.

Run Task by Name

Tool to execute a task by its name, always using the latest version.

Screenshot Webpage

Tool to take a screenshot of a specified webpage within a session.

Scroll Session

Tool to perform a scroll action at specified coordinates within a browser session.

Set Clipboard Content

Tool to set the content of the clipboard in a browser session.

Signal Event

Tool to signal a specific event to be received by other processes or sessions.

Start Browser Session

Tool to start a new browser session with optional customizations.

Take Screenshot

Tool to take a screenshot of the current browser session and return it as an image.

Type Text

Tool to type specified text with optional delay between keystrokes.

Update Profile

Updates an existing browser profile with data from an active session.

Update Task Metadata

Updates task metadata (name and description).

Upload Extension

Tool to upload a new browser extension as a ZIP file for use in browser sessions.

Upload File

Tool to upload a file to a browser session as an agent resource.

Upload Files to Session

Tool to upload files directly to a browser session for use with web forms and file inputs.

Wait for Event

Blocks execution until a specific named event is signaled or the timeout expires.

FRAMEWORKS

How to build Anchor browser MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Anchor browser MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Anchor browser MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Anchor browser MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Anchor browser MCP with Claude Cowork

Codex logo

Codex

Use Anchor browser MCP with Codex

OpenClaw logo

OpenClaw

Use Anchor browser MCP with OpenClaw

Hermes logo

Hermes

Use Anchor browser MCP with Hermes

CLI logo

CLI

Use Anchor browser MCP with CLI

Google ADK logo

Google ADK

Use Anchor browser MCP with Google ADK

LangChain logo

LangChain

Use Anchor browser MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Anchor browser MCP with Vercel AI SDK

LlamaIndex logo

LlamaIndex

Use Anchor browser MCP with LlamaIndex

CrewAI logo

CrewAI

Use Anchor browser MCP with CrewAI

FAQ

Frequently asked questions

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

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

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