How to integrate Postman MCP with Claude Agent SDK

This guide walks you through connecting Postman to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Postman agent that can run the 'get users' request in postman, list all collections in your postman workspace, create a new environment variable in postman through natural language commands. This guide will help you understand how to give your Claude Agent SDK agent real control over a Postman account through Composio's Postman 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 Postman to the Claude Agent SDK using the Composio tool router. By the end, you'll have a working Postman agent that can run the 'get users' request in postman, list all collections in your postman workspace, create a new environment variable in postman through natural language commands.

This guide will help you understand how to give your Claude Agent SDK agent real control over a Postman account through Composio's Postman 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:
  • Get and set up your Claude/Anthropic and Composio API keys
  • Install the necessary dependencies
  • Initialize Composio and create a Tool Router session for Postman
  • Configure an AI agent that can use Postman as a tool
  • Run a live chat session where you can ask the agent to perform Postman operations

What is Claude Agent SDK?

The Claude Agent SDK is Anthropic's official framework for building AI agents powered by Claude. It provides a streamlined interface for creating agents with MCP tool support and conversation management.

Key features include:

  • Native MCP Support: Built-in support for Model Context Protocol servers
  • Permission Modes: Control tool execution permissions
  • Streaming Responses: Real-time response streaming for interactive applications
  • Context Manager: Clean async context management for sessions

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

The Postman MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Postman account. It provides structured and secure access so your agent can perform Postman 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:
  • Composio API Key and Claude/Anthropic API Key
  • Primary know-how of Claude Agents SDK
  • A Postman account
  • Some knowledge of Python
2

Getting API Keys for Claude/Anthropic and Composio

Claude/Anthropic API Key
  • Go to the Anthropic Console and create an API key. You'll need credits to use the models.
  • 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 @anthropic-ai/claude-agent-sdk @composio/core dotenv

Install the Composio SDK and the Claude Agents SDK.

What's happening:

  • @composio/core provides Composio integration for Anthropic
  • @anthropic-ai/claude-agent-sdk is the core agent framework
  • dotenv/config loads environment variables
4

Set up environment variables

bash
COMPOSIO_API_KEY=your_composio_api_key_here
USER_ID=your_user_id_here
ANTHROPIC_API_KEY=your_anthropic_api_key_here

Create a .env file in your project root.

What's happening:

  • COMPOSIO_API_KEY authenticates with Composio
  • USER_ID identifies the user for session management
  • ANTHROPIC_API_KEY authenticates with Anthropic/Claude
5

Import dependencies

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

dotenv.config();
What's happening:
  • We're importing all necessary libraries including the Claude Agent SDK and Composio
  • The dotenv.config() function loads environment variables from your .env file
  • This setup prepares the foundation for connecting Claude with Postman functionality
6

Create a Composio instance and Tool Router session

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });

  // Create Tool Router session for Postman
  const session = await composio.create(USER_ID, {
    toolkits: ['postman'],
  });
  const mcpUrl = session?.mcp.url;
What's happening:
  • The function checks for the required COMPOSIO_API_KEY environment variable
  • We're creating a Composio instance using our API key
  • The create method creates a Tool Router session for Postman
  • The returned url is the MCP server URL that your agent will use
7

Configure Claude Agent with MCP

const options: Options = {
  permissionMode: 'bypassPermissions',
  mcpServers: {
    composio: {
      type: 'http',
      url: mcpUrl,
      headers: { 'x-api-key': COMPOSIO_API_KEY }
    }
  },
  systemPrompt: 'You are a helpful assistant with access to Postman tools via Composio.',
  maxTurns: 10,
};
What's happening:
  • We're configuring the Claude Agent options with the MCP server URL
  • permissionMode: 'bypassPermissions' allows the agent to execute operations without asking for permission each time
  • The system prompt instructs the agent that it has access to Postman
  • maxTurns: 10 limits the conversation length to prevent excessive API usage
8

Create client and start chat loop

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

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}
What's happening:
  • The readline interface is created to handle user input and output
  • The query function is used to send the user's input to the agent
  • The chat loop continues until the user types 'exit' or 'quit'
9

Run the application

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}
What's happening:
  • The chat function is the entry point for the application
  • The try-catch block is used to handle any errors that occur

Complete Code

Here's the complete code to get you started with Postman and Claude Agent SDK:

import 'dotenv/config';
import readline from 'node:readline';
import { Composio } from '@composio/core';
import { query, type Options } from "@anthropic-ai/claude-agent-sdk";

async function chat() {
  const { COMPOSIO_API_KEY, USER_ID } = process.env;
  if (!COMPOSIO_API_KEY || !USER_ID) {
    throw new Error('COMPOSIO_API_KEY and USER_ID required in .env');
  }

  const composio = new Composio({ apiKey: COMPOSIO_API_KEY });
  const session = await composio.create(USER_ID, {
    toolkits: ['postman']
  });
  const mcp_url = session?.mcp.url;

  const options: Options = {
    permissionMode: 'bypassPermissions',
    mcpServers: {
      composio: {
        type: 'http',
        url: mcp_url,
        headers: { 'x-api-key': COMPOSIO_API_KEY }
      }
    },
    systemPrompt: 'You are a helpful assistant with access to Postman tools via Composio.',
    maxTurns: 10,
  };

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

  console.log('\nChat started. Type "exit" to quit.\n');

  let isProcessing = false;

  async function ask(prompt: string) {
    isProcessing = true;
    rl.pause();

    process.stdout.write('Claude is thinking...');
    const stream = query({ prompt, options });

    let firstChunk = true;
    for await (const msg of stream) {
      const content = (msg as any).message?.content || (msg as any).content;
      if (Array.isArray(content)) {
        for (const block of content) {
          if (block.type === 'text' && block.text) {
            if (firstChunk) {
              process.stdout.write('\r\x1b[K');
              process.stdout.write('Claude: ');
              firstChunk = false;
            }
            process.stdout.write(block.text);
          }
        }
      }
    }
    process.stdout.write('\n\n');

    isProcessing = false;
    rl.resume();
    rl.prompt();
  }

  rl.on('line', async (line) => {
    if (isProcessing) return;

    const input = line.trim();
    if (input === 'exit') {
      rl.close();
      process.exit(0);
    }
    if (input) await ask(input);
    else rl.prompt();
  });

  await ask('What can you help me with?');
}

try {
  await chat();
} catch (error) {
  console.error(error);
  process.exit(1);
}

Conclusion

You've successfully built a Claude Agent SDK agent that can interact with Postman through Composio's Tool Router.

Key features:

  • Native MCP support through Claude's agent framework
  • Streaming responses for real-time interaction
  • Permission bypass for smooth automated workflows
You can extend this by adding more toolkits, implementing custom business logic, or building a web interface around the agent.
TOOLS

Supported Tools

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

Create a Collection

Tool to create a new Postman collection in a specific workspace or the default workspace.

Create a Collection Comment

Tool to create a comment on an API's collection.

Create Collection from Schema

Tool to create a collection from a schema and link it to an API with specified relations.

Create a Folder

Tool to create a folder in a Postman collection.

Create a Folder Comment

Tool to create a comment on a folder.

Create a Fork

Tool to create a fork from an existing collection into a workspace.

Create Environment Fork

Tool to create a fork from an existing environment into a workspace.

Create a Mock Server

Tool to create a new mock server in a Postman collection.

Create a Monitor

Tool to create a new monitor in a specific workspace to run a collection on a schedule.

Create an API

Tool to create a new API in Postman.

Create an API

Tool to create a new API in a Postman workspace.

Create an Environment

Tool to create a new environment in a Postman workspace.

Create a Pull Request

Tool to create a pull request for a forked collection into its parent collection.

Create Request in Collection

Tool to create a new request in a Postman collection.

Create a Request Comment

Tool to create a comment on a request.

Create a Response

Tool to create a request response in a Postman collection.

Create a Response Comment

Tool to create a comment on a response.

Create API Schema

Tool to create a schema for an API in Postman.

Create Mock Server Response

Tool to create a server response on a Postman mock server.

Create a Spec

Tool to create an API specification in Postman's Spec Hub.

Create Spec File

Tool to create a new file in an API specification.

Create a Webhook

Tool to create a webhook that triggers a collection with a custom payload.

Create a Workspace

Tool to create a new workspace in Postman.

Create Collection

Tool to create a new Postman collection with specified name and configuration.

Create Environment

Tool to create a new Postman environment with specified name and variables.

Create Mock Server

Tool to create a new mock server for a Postman collection.

Create Monitor

Tool to create a new monitor to run a collection on a schedule.

Create or Update a Schema File

Tool to create or update an API schema file in Postman.

Create API Version Relations

Tool to create new relations for an API version.

Create Webhook

Tool to create a new webhook for a Postman collection.

Delete a Collection

Tool to permanently delete a collection from Postman.

Delete a collection's comment

Tool to delete a comment from an API's collection.

Delete a Folder

Tool to delete a folder in a Postman collection.

Delete a Folder's Comment

Tool to delete a comment from a folder.

Delete an API

Tool to delete an API from Postman.

Delete an API's Comment

Tool to delete a comment from an API.

Delete an environment

Tool to delete an environment permanently in Postman.

Delete a Request's Comment

Tool to delete a comment from a request.

Delete a Response

Tool to delete a response in a Postman collection.

Delete a Response's Comment

Tool to delete a comment from a response.

Delete a Schema File

Tool to delete a file in an API schema.

Delete Mock Server Response

Tool to delete a mock server's server response.

Delete a Spec

Tool to delete an API specification from Postman.

Delete Spec File

Tool to delete a file from an API specification.

Delete a Workspace

Tool to delete a Postman workspace permanently.

Delete Monitor

Tool to delete a monitor by its ID.

Duplicate a Collection

Tool to create a duplicate of a collection in another workspace.

Fork Collection

Tool to create a fork of a collection in a specified workspace.

Generate Collection from Spec

Tool to generate a Postman collection from an OpenAPI 2.

Generate Spec from Collection

Tool to generate an API specification from a Postman collection.

Get Billing Account Details

Tool to retrieve Postman billing account details for the authenticated team.

Get Collection Comments

Tool to retrieve all comments left by users in an API's collection.

Get Collection's Forks

Tool to get all forks of a specific collection.

Get Collection Pull Requests

Tool to get information about a collection's pull requests including source and destination IDs, status, and URLs.

Get Collection Roles

Tool to get information about all roles in a collection.

Get Folder Information

Tool to retrieve information about a folder in a Postman collection.

Get Folder Comments

Tool to retrieve all comments left by users in a folder.

Get All API Releases

Tool to get all releases for a specific API version in Postman.

Get All APIs

Tool to get all APIs accessible to the authenticated user with optional workspace filtering.

Get All APIs in Workspace

Tool to get all APIs in a specific Postman workspace.

Get All Collections

Tool to get all collections accessible to the authenticated user with optional workspace filtering.

Get All Collections

Tool to get all collections accessible to the authenticated user.

Get All Environments

Tool to get all environments accessible to the authenticated user with optional workspace filtering.

Get All Forked Collections

Tool to retrieve all forked collections for the authenticated user.

Get All Groups

Tool to get all user groups in a Postman team.

Get All Linked Relations

Tool to retrieve all linked relations for a specific API version in Postman.

Get All Mock Servers

Tool to get all active mock servers accessible to the authenticated user.

Get All Monitors

Tool to get all monitors accessible to the authenticated user with optional workspace filtering.

Get All Workspace Roles

Tool to get information about all roles in a workspace based on the team's plan.

Get All API Specifications

Tool to get all API specifications in a workspace.

Get All Team Users

Tool to get information about all users on the Postman team.

Get All Test Relations

Tool to retrieve all test relations for a specific API version.

Get All API Versions

Tool to get all published versions of a specific API in Postman.

Get All Workspaces

Tool to get all workspaces accessible to the authenticated user with optional type filtering.

Get Monitor Information

Tool to retrieve information about a specific monitor in Postman.

Get API Information

Tool to retrieve information about a specific API in Postman.

Get API Comments

Tool to retrieve all comments left by users in an API.

Get API Version

Tool to get information about a specific API version in Postman.

Get an Environment

Tool to retrieve detailed information about a specific environment in Postman.

Get Environment Forks

Tool to retrieve all forked environments for a specific environment.

Get Request Information

Tool to retrieve information about a specific request in a Postman collection.

Get Request Comments

Tool to retrieve all comments left by users in a request.

Get Response Information

Tool to retrieve information about a saved response in a Postman collection.

Get Response Comments

Tool to retrieve all comments left by users in a response.

Get API Schema

Tool to retrieve information about an API schema from Postman.

Get API Specification

Tool to retrieve information about an API specification in Postman.

Get Spec File Contents

Tool to get the contents of an API specification's file.

Get Spec Definition

Tool to get the complete contents of an API specification's definition.

Get Specification Files

Tool to retrieve all files in an API specification from Postman.

Get Spec's Generated Collections

Tool to retrieve all collections generated from an API specification in Postman.

Get Async Collection Update Status

Tool to get the status of an asynchronous collection update task.

Get Team User

Tool to get information about a user on the Postman team.

Get Authenticated User

Tool to get information about the authenticated user.

Get Workspace Details

Tool to get detailed information about a specific workspace by its ID.

Get Workspace Activity Feed

Tool to get a workspace's activity feed showing who added or removed collections, environments, or elements, and users joining or leaving.

Get Workspace Roles

Tool to get the roles of users, user groups, and partners in a workspace.

Get Collection Access Keys

Tool to retrieve all personal and team collection access keys for the authenticated user.

Get Contract Test Relations

Tool to retrieve contract test relations for a specific API version.

Get documentation relations

Tool to get documentation relations for a specific API version.

Get Duplication Task Status

Tool to get the status of a collection duplication task.

Get Environment Relations

Tool to get environment relations for a specific API version.

Get Generated Specification

Tool to retrieve the API specification generated for a Postman collection.

Get Workspace Global Variables

Tool to get a workspace's global variables.

Get Integration Test Relations

Tool to get integration test relations for a specific API version.

Get Resource Types

Tool to get all resource types supported by Postman's SCIM API.

Get Schema File Contents

Tool to get the contents of an API schema file at a specified path.

Get Schema Files

Tool to retrieve files in an API schema from Postman.

Get Service Provider Configuration

Tool to get Postman's SCIM API service provider configuration information.

Get Source Collection Status

Tool to check whether there is a change between a forked collection and its parent (source) collection.

Get Test Suite Relations

Tool to get test suite relations for a specific API version.

Get Unclassified Relations

Tool to get unclassified relations for an API version in Postman.

Import OpenAPI Definition

Tool to import an OpenAPI definition into Postman as a new collection.

Import OpenAPI Specification

Tool to import an OpenAPI specification into Postman as a new collection.

List Account Invoices

Tool to get all invoices for a Postman billing account filtered by status.

Merge a Fork

Tool to merge a forked collection back into its parent collection.

Merge a forked environment

Tool to merge a forked environment back into its parent environment.

Publish a Mock Server

Tool to publish a mock server in Postman.

Pull Source Changes into Fork

Tool to pull changes from a parent (source) collection into a forked collection.

Replace an Environment's Data

Tool to completely replace an environment's data with new variables and values.

Replace Collection Data Asynchronously

Tool to replace the entire contents of a collection asynchronously.

Resolve a Comment Thread

Tool to resolve a comment thread and any associated replies.

Review a Pull Request

Tool to update the review status of a pull request by approving, declining, or unapproving it.

Run a Monitor

Tool to trigger an immediate run of a monitor and retrieve its execution results.

Sync Collection with API Schema

Tool to sync a collection attached to an API with the API schema.

Sync Collection with Specification

Tool to sync a collection generated from an API specification.

Sync Spec with Collection

Tool to sync an API specification with a linked collection.

Transfer Folders

Tool to copy or move folders into a collection or folder.

Transform Collection to OpenAPI

Tool to transform an existing Postman Collection into a stringified OpenAPI 3.

Update a Folder

Tool to update a folder in a Postman collection.

Update a Folder's Comment

Tool to update a comment on a folder.

Update a Mock Server

Tool to update an existing mock server.

Update a Monitor

Tool to update an existing monitor in Postman.

Update an API

Tool to update an existing API in Postman.

Update an API's Comment

Tool to update a comment on an API.

Update an Environment

Tool to update specific environment properties using JSON Patch operations (RFC 6902).

Update a Pull Request

Tool to update an open pull request in Postman.

Update Request in Collection

Tool to update a request in a Postman collection.

Update a Request's Comment

Tool to update a comment on a request.

Update a Response

Tool to update a response in a Postman collection.

Update a Response's Comment

Tool to update a comment on a response.

Update a Server Response

Tool to update a mock server's server response.

Update Spec File

Tool to update an API specification file's content.

Update Spec Properties

Tool to update an API specification's properties such as its name.

Update a Workspace

Tool to update an existing workspace in Postman.

Update Workspace Global Variables

Tool to update and replace a workspace's global variables.

Update Collection Properties

Tool to update specific collection properties like name, description, authentication, variables, or events.

FRAMEWORKS

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ChatGPT

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Claude Code logo

Claude Code

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Claude Cowork

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Codex logo

Codex

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Cursor logo

Cursor

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OpenClaw logo

OpenClaw

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Hermes logo

Hermes

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CLI logo

CLI

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Google ADK logo

Google ADK

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LangChain logo

LangChain

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Vercel AI SDK logo

Vercel AI SDK

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Mastra AI logo

Mastra AI

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LlamaIndex logo

LlamaIndex

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CrewAI

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OpenCode logo

OpenCode

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VS Code logo

VS Code

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FAQ

Frequently asked questions

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

Yes, you can. Claude Agent SDK 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 Postman tools.

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

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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.

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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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