How to integrate Postman MCP with Google ADK

This guide walks you through connecting Postman to Google ADK 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 Google ADK 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 Google ADK 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 Google ADK 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.

Also integrate Postman with

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TL;DR

Here's what you'll learn:
  • Get a Postman account set up and connected to Composio
  • Install the Google ADK and Composio packages
  • Create a Composio Tool Router session for Postman
  • Build an agent that connects to Postman through MCP
  • Interact with Postman using natural language

What is Google ADK?

Google ADK (Agents Development Kit) is Google's framework for building AI agents powered by Gemini models. It provides tools for creating agents that can use external services through the Model Context Protocol.

Key features include:

  • Gemini Integration: Native support for Google's Gemini models
  • MCP Toolset: Built-in support for Model Context Protocol tools
  • Streamable HTTP: Connect to external services through streamable HTTP
  • CLI and Web UI: Run agents via command line or web interface

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:
  • A Google API key for Gemini models
  • A Composio account and API key
  • Python 3.9 or later installed
  • Basic familiarity with Python
2

Getting API Keys for Google and Composio

Google API Key
  • Go to Google AI Studio and create an API key.
  • Copy the key and keep it safe. You will put this in GOOGLE_API_KEY.
Composio API Key and User ID
  • Log in to the Composio dashboard.
  • Go to Settings → API Keys and copy your Composio API key. Use this for COMPOSIO_API_KEY.
  • Decide on a stable user identifier to scope sessions, often your email or a user ID. Use this for COMPOSIO_USER_ID.
3

Install dependencies

bash
pip install google-adk composio python-dotenv

Inside your virtual environment, install the required packages.

What's happening:

  • google-adk is Google's Agents Development Kit
  • composio connects your agent to Postman via MCP
  • python-dotenv loads environment variables
4

Set up ADK project

bash
adk create my_agent

Set up a new Google ADK project.

What's happening:

  • This creates an agent folder with a root agent file and .env file
5

Set environment variables

bash
GOOGLE_API_KEY=your-google-api-key
COMPOSIO_API_KEY=your-composio-api-key
COMPOSIO_USER_ID=your-user-id-or-email

Save all your credentials in the .env file.

What's happening:

  • GOOGLE_API_KEY authenticates with Google's Gemini models
  • COMPOSIO_API_KEY authenticates with Composio
  • COMPOSIO_USER_ID identifies the user for session management
6

Import modules and validate environment

python
import os
import warnings

from composio import Composio
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()

warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")
What's happening:
  • os reads environment variables
  • Composio is the main Composio SDK client
  • GoogleProvider declares that you are using Google ADK as the agent runtime
  • Agent is the Google ADK LLM agent class
  • McpToolset lets the ADK agent call MCP tools over HTTP
7

Create Composio client and Tool Router session

python
composio_client = Composio(api_key=COMPOSIO_API_KEY)

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["postman"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url,
print(f"Composio MCP URL: {COMPOSIO_MCP_URL}")
What's happening:
  • Authenticates to Composio with your API key
  • Declares Google ADK as the provider
  • Spins up a short-lived MCP endpoint for your user and selected toolkit
  • Stores the MCP HTTP URL for the ADK MCP integration
8

Set up the McpToolset and create the Agent

python
composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Postman operations."
    ),
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")
What's happening:
  • Connects the ADK agent to the Composio MCP endpoint through McpToolset
  • Uses Gemini as the model powering the agent
  • Lists exact tool names in instruction to reduce misnamed tool calls
9

Run the agent

bash
# Run in CLI mode
adk run my_agent

# Or run in web UI mode
adk web

Execute the agent from the project root. The web command opens a web portal where you can chat with the agent.

What's happening:

  • adk run runs the agent in CLI mode
  • adk web . opens a web UI for interactive testing

Complete Code

Here's the complete code to get you started with Postman and Google ADK:

python
import os
import warnings

from composio import Composio
from composio_google import GoogleProvider
from dotenv import load_dotenv
from google.adk.agents.llm_agent import Agent
from google.adk.tools.mcp_tool.mcp_session_manager import StreamableHTTPConnectionParams
from google.adk.tools.mcp_tool.mcp_toolset import McpToolset

load_dotenv()
warnings.filterwarnings("ignore", message=".*BaseAuthenticatedTool.*")

GOOGLE_API_KEY = os.getenv("GOOGLE_API_KEY")
COMPOSIO_API_KEY = os.getenv("COMPOSIO_API_KEY")
COMPOSIO_USER_ID = os.getenv("COMPOSIO_USER_ID")

if not GOOGLE_API_KEY:
    raise ValueError("GOOGLE_API_KEY is not set in the environment.")
if not COMPOSIO_API_KEY:
    raise ValueError("COMPOSIO_API_KEY is not set in the environment.")
if not COMPOSIO_USER_ID:
    raise ValueError("COMPOSIO_USER_ID is not set in the environment.")

composio_client = Composio(api_key=COMPOSIO_API_KEY, provider=GoogleProvider())

composio_session = composio_client.create(
    user_id=COMPOSIO_USER_ID,
    toolkits=["postman"],
)

COMPOSIO_MCP_URL = composio_session.mcp.url


composio_toolset = McpToolset(
    connection_params=StreamableHTTPConnectionParams(
        url=COMPOSIO_MCP_URL,
        headers={"x-api-key": COMPOSIO_API_KEY}
    )
)

root_agent = Agent(
    model="gemini-2.5-flash",
    name="composio_agent",
    description="An agent that uses Composio tools to perform actions.",
    instruction=(
        "You are a helpful assistant connected to Composio. "
        "You have the following tools available: "
        "COMPOSIO_SEARCH_TOOLS, COMPOSIO_MULTI_EXECUTE_TOOL, "
        "COMPOSIO_MANAGE_CONNECTIONS, COMPOSIO_REMOTE_BASH_TOOL, COMPOSIO_REMOTE_WORKBENCH. "
        "Use these tools to help users with Postman operations."
    ),  
    tools=[composio_toolset],
)

print("\nAgent setup complete. You can now run this agent directly ;)")

Conclusion

You've successfully integrated Postman with the Google ADK through Composio's MCP Tool Router. Your agent can now interact with Postman using natural language commands.

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Postman tools
  • Environment variables keep your credentials secure and separate from code
  • Clear agent instructions reduce tool calling errors
  • The ADK web UI provides an interactive interface for testing and development

You can extend this setup by adding more toolkits to the toolkits array in your session configuration.

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

How to build Postman MCP Agent with another framework

ChatGPT logo

ChatGPT

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OpenAI Agents SDK logo

OpenAI Agents SDK

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Claude Agent SDK logo

Claude Agent SDK

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Claude Code logo

Claude Code

Use Postman MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Postman MCP with Claude Cowork

Codex logo

Codex

Use Postman MCP with Codex

Cursor logo

Cursor

Use Postman MCP with Cursor

OpenClaw logo

OpenClaw

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Hermes logo

Hermes

Use Postman MCP with Hermes

CLI logo

CLI

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LangChain logo

LangChain

Use Postman MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Postman MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Postman MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Postman MCP with LlamaIndex

CrewAI logo

CrewAI

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OpenCode logo

OpenCode

Use Postman MCP with OpenCode

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. Google ADK 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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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

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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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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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