How to integrate Stack exchange MCP with Google ADK

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Introduction

This guide walks you through connecting Stack exchange to Google ADK using the Composio tool router. By the end, you'll have a working Stack exchange agent that can find top-voted javascript questions this week, list all collectives on stack overflow, show recent comments on your math stackexchange post through natural language commands.

This guide will help you understand how to give your Google ADK agent real control over a Stack exchange account through Composio's Stack exchange MCP server.

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

Also integrate Stack exchange with

TL;DR

Here's what you'll learn:
  • Get a Stack exchange account set up and connected to Composio
  • Install the Google ADK and Composio packages
  • Create a Composio Tool Router session for Stack exchange
  • Build an agent that connects to Stack exchange through MCP
  • Interact with Stack exchange 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 Stack exchange MCP server, and what's possible with it?

The Stack exchange MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Stack Exchange account. It provides structured and secure access to your Stack Exchange activity, so your agent can perform actions like searching questions, exploring collectives, retrieving comments, and analyzing post revisions on your behalf.

  • Powerful question search and discovery: Instantly ask your agent to search for Stack Exchange questions by keyword or tag, helping you find relevant discussions and solutions faster.
  • Collectives and tags exploration: Have your agent retrieve lists of collectives and their associated tags, making it easy to discover expert communities and filter content by topic.
  • Comment management and flagging: Let your agent fetch comments from specific sites and check valid flag options, streamlining comment moderation and participation.
  • Revision history analysis: Direct your agent to retrieve and review the full edit history of posts, enabling transparent audits or understanding how answers evolve over time.
  • Site discovery and navigation: Use your agent to list all available Stack Exchange sites and their API parameters, ensuring you always target the right community for your needs.

Supported Tools & Triggers

Tools
Create FilterTool to create a custom filter for Stack Exchange API responses.
Find Similar QuestionsTool to find questions similar to a hypothetical one based on a title and optional tag combination.
Get Access TokensTool to read the properties for a set of access tokens obtained via OAuth 2.
Get Answer CommentsTool to retrieve comments on a set of answers from Stack Exchange.
Get Answer Flag OptionsTool to fetch valid flag options for a specific answer.
Get Answers By IDsTool to retrieve a set of answers by their IDs from a Stack Exchange site.
Get Badge Recipients By IDsTool to retrieve recently awarded badges constrained to a specific set of badge IDs.
Get Badges By IDsTool to retrieve badges by their IDs on a Stack Exchange site.
Get Collective AnswersTool to retrieve answers belonging to the specified collective(s) on a Stack Exchange site.
Get Collective QuestionsTool to retrieve questions associated with the specified collective.
Get CollectivesTool to retrieve all collectives on a Stack Exchange site in alphabetical order.
Get Collectives By SlugsTool to retrieve Collective objects by their slugs from a Stack Exchange site.
Get Collective TagsRetrieve tags associated with specified Stack Overflow collectives.
Get Collective UsersTool to retrieve users who are members of the specified Collectives on Stack Exchange.
Get Comment Flag OptionsTool to fetch valid flag options for a given comment.
Get CommentsRetrieves comments from a Stack Exchange site (e.
Get Comments By IDsTool to retrieve specific comments by their IDs from a Stack Exchange site.
Get EventsRetrieves a stream of recent events that occurred on a Stack Exchange site.
Get Filters By IDsTool to retrieve the fields included by the given filters and the safeness of those filters.
Get Linked QuestionsTool to get questions which link to those questions identified in the ids parameter.
Get MeTool to retrieve the authenticated user's profile information from Stack Exchange.
Get My AchievementsRetrieves the authenticated user's recent network-wide achievements across all Stack Exchange sites.
Get My Associated AccountsTool to retrieve all Stack Exchange accounts associated with the authenticated user.
Get My Featured QuestionsTool to retrieve questions with active bounties offered by the authenticated user.
Get My MentionsTool to retrieve comments mentioning the authenticated user on a Stack Exchange site.
Get My Merge HistoryTool to retrieve account merge history for the authenticated user.
Get My Network ActivityTool to retrieve a summary of the authenticated user's activity across the Stack Exchange network.
Get My No Answer QuestionsTool to retrieve questions owned by the authenticated user that have no answers.
Get My PostsTool to retrieve posts (questions and answers) owned by the authenticated user from a Stack Exchange site.
Get My PrivilegesTool to retrieve privileges for the authenticated user on a Stack Exchange site.
Get My QuestionsTool to retrieve questions owned by the authenticated user on a Stack Exchange site.
Get My ReputationTool to retrieve reputation changes for the authenticated user on a Stack Exchange site.
Get My Reputation HistoryTool to retrieve the authenticated user's public reputation history on a Stack Exchange site.
Get My Suggested EditsTool to retrieve suggested edits submitted by the authenticated user on a Stack Exchange site.
Get My Tag PreferencesTool to retrieve tag preferences for the authenticated user on a Stack Exchange site.
Get My TagsTool to retrieve tags the authenticated user is active in on a Stack Exchange site.
Get My TimelineTool to retrieve a timeline of actions the authenticated user has taken on a Stack Exchange site.
Get My Top Answers In TagsTool to retrieve the top 30 answers the authenticated user has posted in response to questions with specific tags.
Get My Top Answer TagsTool to retrieve the authenticated user's top 30 tags by answer score on a Stack Exchange site.
Get My Top Questions In TagsTool to retrieve the top 30 questions the authenticated user has posted in response to questions with the given tags.
Get My Top Question TagsTool to retrieve the authenticated user's top 30 tags by question score on a Stack Exchange site.
Get My Top TagsTool to retrieve the authenticated user's top 30 tags by combined question and answer score on a Stack Exchange site.
Get My Unaccepted QuestionsTool to retrieve questions owned by the authenticated user that have no accepted answer.
Get My Unanswered QuestionsTool to retrieve questions owned by the authenticated user that are not considered answered.
Get Post CommentsTool to retrieve comments on posts identified by IDs, regardless of post type (question or answer).
Get Posts By IDsTool to retrieve a set of posts by their IDs from a Stack Exchange site.
Get Post Suggested EditsTool to retrieve suggested edits on posts from a Stack Exchange site.
Get Question AnswersTool to retrieve all answers for a set of questions identified by their IDs.
Get Question Close OptionsTool to fetch flag options that make up close reasons for a specific question.
Get Question CommentsTool to retrieve comments on a set of questions from Stack Exchange.
Get Question Flag OptionsTool to fetch valid flag options, including close reasons, for a specific question.
Get QuestionsTool to retrieve a list of questions from a Stack Exchange site without requiring tags or keywords.
Get Questions By Answer IDsTool to retrieve questions that specific answers belong to on a Stack Exchange site.
Get Questions By IDsTool to retrieve a set of questions by their IDs from a Stack Exchange site.
Get Question TimelineTool to retrieve timeline events for specified questions on a Stack Exchange site.
Get Related TagsTool to retrieve tags most related to the specified tags on a Stack Exchange site.
Get Revisions By IDsTool to retrieve revisions for specific posts by their IDs.
Search QuestionsTool to search the site for questions meeting certain criteria.
Get Site InfoTool to retrieve comprehensive statistics and information about a Stack Exchange site.
Get SitesRetrieves a comprehensive list of all Stack Exchange network sites with detailed information including site names, URLs, styling, and api_site_parameter values needed for other API calls.
Get Suggested Edits By IDsTool to retrieve suggested edits by their IDs from a Stack Exchange site.
Get Tag FAQTool to retrieve frequently asked questions for a set of tags on Stack Exchange.
Get Tag InfoTool to retrieve tag objects representing specified tags on a Stack Exchange site.
Get Tag SynonymsTool to retrieve all synonyms that point to the specified tags on a Stack Exchange site.
Get Tag Top AnswerersTool to retrieve the top 30 answerers active in a single tag, of either all-time or the last 30 days.
Get Tag Top AskersTool to retrieve the top askers active in a single tag.
Get Tag WikisTool to retrieve wiki content for specified tags on a Stack Exchange site.
Get User AnswersTool to retrieve answers posted by specific users on a Stack Exchange site.
Get User Associated AccountsTool to retrieve all Stack Exchange accounts associated with specified users by their account IDs.
Get User BadgesTool to retrieve badges earned by specified users on a Stack Exchange site.
Get User CommentsTool to retrieve comments posted by specified users on a Stack Exchange site.
Get User Comments To UserTool to retrieve comments that specific users have posted in reply to a single user.
Get User FavoritesTool to retrieve the questions that users have favorited/bookmarked.
Get User Featured QuestionsTool to retrieve questions with active bounties offered by specified users.
Get User Full Reputation HistoryTool to retrieve a user's full reputation history on a Stack Exchange site, including private events.
Get User InboxTool to retrieve a user's inbox from Stack Exchange.
Get User MentionsTool to retrieve comments that mention specific users on a Stack Exchange site.
Get User Merge HistoryTool to retrieve account merge history for specified user account IDs across the Stack Exchange network.
Get User No Answer QuestionsTool to retrieve questions asked by specified users that have zero undeleted answers.
Get User NotificationsTool to retrieve notifications for a specific Stack Exchange user by ID.
Get User PostsTool to retrieve posts (questions and answers) posted by specific users on a Stack Exchange site.
Get User PrivilegesTool to retrieve privileges a specific user has on a Stack Exchange site.
Get User QuestionsTool to retrieve questions asked by specific users on a Stack Exchange site.
Get User ReputationTool to retrieve reputation changes for users on a Stack Exchange site.
Get User Reputation HistoryTool to retrieve public reputation history for specified Stack Exchange users.
Get Users By IDsTool to retrieve user profiles by their IDs from a Stack Exchange site.
Get User Suggested EditsTool to retrieve suggested edits submitted by specified users on a Stack Exchange site.
Get User TagsTool to retrieve tags that specified users are active in on a Stack Exchange site.
Get User TimelineTool to retrieve a timeline of actions taken by specified users on a Stack Exchange site.
Get User Top Answers In TagsTool to retrieve the top 30 answers a specific user has posted in response to questions with given tags.
Get User Top Answer TagsTool to retrieve a single user's top tags by answer score on Stack Exchange.
Get User Top Questions In TagsTool to retrieve the top 30 questions a user has asked with the given tags.
Get User Top Question TagsTool to retrieve a single user's top tags by question score on a Stack Exchange site.
Get User Top TagsTool to retrieve a single user's top tags by combined question and answer score on a Stack Exchange site.
Get User Unaccepted QuestionsTool to retrieve questions asked by specified users that have at least one answer but no accepted answer.
Get User Unanswered QuestionsTool to retrieve questions asked by specific users that the site considers unanswered.
Get User Unread InboxTool to retrieve unread items in a specific user's Stack Exchange inbox.
Get User Unread NotificationsTool to retrieve unread notifications for a specific user on Stack Exchange.
List AnswersTool to retrieve all undeleted answers from a Stack Exchange site.
List Badge RecipientsTool to retrieve recently awarded badges from a Stack Exchange site.
List BadgesTool to retrieve all badges available in a Stack Exchange site.
List Elected ModeratorsTool to retrieve users who have moderator powers and were actually elected on a Stack Exchange site.
List ErrorsTool to retrieve the various error codes that can be produced by the Stack Exchange API.
List Featured QuestionsTool to retrieve all questions with active bounties in the system.
List Moderator Only TagsTool to retrieve tags that only moderators can use on a Stack Exchange site.
List ModeratorsTool to retrieve users who can exercise moderation powers on a Stack Exchange site.
List Named BadgesTool to retrieve all explicitly named badges from a Stack Exchange site.
List No Answer QuestionsTool to retrieve questions that have received no answers from a Stack Exchange site.
List PostsTool to retrieve all posts (questions and answers) from a Stack Exchange site.
List PrivilegesTool to retrieve all earnable privileges on a Stack Exchange site.
List Required TagsTool to retrieve tags found on a site that fulfill required tag constraints on questions.
List Suggested EditsTool to retrieve all suggested edits in a Stack Exchange site.
List Tag BadgesReturns badges awarded for participation in specific tags on Stack Exchange sites.
List TagsTool to retrieve tags found on a Stack Exchange site.
List Tag SynonymsTool to retrieve all tag synonyms found on a Stack Exchange site.
List Unanswered QuestionsTool to retrieve questions the site considers to be unanswered.
List Unanswered Questions My TagsTool to retrieve unanswered questions within the authenticated user's favorite or frequented tags.
List UsersTool to retrieve all users on a Stack Exchange site.
Render AnswerTool to render a preview of an answer given its body and the question it's on.
Advanced SearchTool to search a Stack Exchange site for questions matching advanced criteria.
Search ExcerptsTool to search a Stack Exchange site for items matching given criteria with excerpt snippets.

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

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

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.

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 Stack exchange via MCP
  • python-dotenv loads environment variables

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

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

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

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=["stack_exchange"],
)

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

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 Stack exchange 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

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 Stack exchange 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=["stack_exchange"],
)

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 Stack exchange operations."
    ),  
    tools=[composio_toolset],
)

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

Conclusion

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

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Stack exchange 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.

How to build Stack exchange MCP Agent with another framework

FAQ

What are the differences in Tool Router MCP and Stack exchange MCP?

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

Can I use Tool Router MCP with Google ADK?

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 Stack exchange tools.

Can I manage the permissions and scopes for Stack exchange while using Tool Router?

Yes, absolutely. You can configure which Stack exchange 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.

How safe is my data with Composio Tool Router?

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 Stack exchange data and credentials are handled as safely as possible.

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HubSpot
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Altera
DataStax
Entelligence
Rolai

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