How to integrate Zulip MCP with Google ADK

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Introduction

This guide walks you through connecting Zulip to Google ADK using the Composio tool router. By the end, you'll have a working Zulip agent that can post daily standup summary to #team stream, list unread messages from #support stream, reply to the latest thread in #engineering through natural language commands.

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

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

TL;DR

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

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

Supported Tools & Triggers

Tools
Add Alert WordsTool to add alert words to the current user's configuration.
Add APNs Device TokenTool to add an APNs (Apple Push Notification service) device token to Zulip.
Add Default StreamTool to add a channel as a default stream in Zulip.
Add LinkifierTool to add a linkifier to a Zulip realm.
Add Navigation ViewTool to add a navigation view in Zulip.
Add ReactionTool to add an emoji reaction to a Zulip message.
Archive ChannelTool to archive a channel in Zulip.
Check Messages Match NarrowTool to check if specific messages match a narrow filter.
Create BigBlueButton video callTool to create a BigBlueButton video call in Zulip.
Create ChannelTool to create a new channel in Zulip.
Create Channel FolderTool to create a new channel folder in Zulip.
Create custom profile fieldTool to create a custom profile field in Zulip.
Create DraftsTool to create one or more draft messages in Zulip.
Create reusable invitation linkTool to create a reusable invitation link for the Zulip organization.
Create Message ReminderTool to create a message reminder in Zulip.
Create Saved SnippetTool to create a saved snippet in Zulip.
Create Scheduled MessageTool to create a scheduled message in Zulip.
Delete DraftTool to delete a draft in Zulip.
Delete MessageTool to delete a message in Zulip.
Delete Event QueueTool to delete an event queue previously registered via POST /api/v1/register.
Delete ReminderTool to delete a reminder from Zulip.
Delete Saved SnippetTool to delete a saved snippet by its ID.
Delete Scheduled MessageTool to delete a scheduled message in Zulip.
Delete TopicTool to delete a topic from a Zulip channel/stream.
Edit DraftTool to edit an existing draft message in Zulip.
Edit Navigation ViewTool to update a navigation view in Zulip.
Edit Saved SnippetTool to edit a saved snippet by updating its title and/or content.
Export RealmTool to create a Zulip realm data export.
Get alert wordsTool to retrieve all configured alert words for the authenticated user.
Get Another User PresenceTool to get the presence status for a specific user in Zulip.
Get AttachmentsTool to retrieve metadata on files uploaded by the requesting user.
Get Channel FoldersTool to retrieve all channel folders in the organization, sorted by display order.
Get custom emojiTool to retrieve all custom emoji configured in the Zulip realm.
Get custom profile fieldsTool to get all custom profile fields configured for the Zulip realm.
Get draftsTool to fetch all drafts for the authenticated user.
Get EventsTool to get events from a Zulip event queue.
Get file temporary URLTool to get a public temporary URL for an uploaded file in Zulip.
Get realm iconTool to retrieve the URL of the Zulip realm's icon.
Get all invitationsTool to retrieve all unexpired invitations for the Zulip organization.
Get user group membership statusTool to check if a user is a member of a specific user group.
Get linkifiersTool to retrieve all configured linkifiers in the Zulip realm.
Get messageTool to fetch a single message by ID from Zulip.
Get Message HistoryTool to fetch the complete edit history of a Zulip message.
Get MessagesTool to fetch messages from Zulip.
Get Navigation ViewsTool to fetch all navigation views for the authenticated user.
Get own userTool to retrieve the profile information for the authenticated user.
Get Read ReceiptsTool to retrieve read receipts for a message in Zulip.
Get realm export consentsTool to retrieve data export consent state for users in a realm.
Get all data exportsTool to retrieve all data exports for the Zulip organization.
Get Realm PresenceTool to get the presence status for all users in the Zulip realm.
Get remindersTool to fetch all undelivered reminders for the authenticated user.
Get Saved SnippetsTool to fetch all saved snippets for the authenticated user.
Get Scheduled MessagesTool to fetch all scheduled messages for the authenticated user.
Get server settingsTool to retrieve server configuration and available authentication methods.
Get Channel by IDTool to get detailed information about a Zulip channel by its ID.
Get channel email addressTool to retrieve the email address for a Zulip channel.
Get Channel IDTool to get a channel's unique ID by its name.
Get All ChannelsTool to retrieve all channels (streams) in Zulip that match specified filters.
Get stream topicsTool to retrieve all topics in a Zulip channel.
Get Channel SubscribersTool to get all subscribers of a Zulip channel.
Get SubscriptionsTool to retrieve all channels (streams) the authenticated user is subscribed to.
Get subscription statusTool to check whether a specific user is subscribed to a particular channel (stream).
Get user by emailTool to fetch a user by email address from Zulip.
Get user channelsTool to retrieve the list of channel IDs that a specific user is subscribed to.
Get user group membersTool to retrieve all members of a specific user group.
Get user groupsTool to retrieve all user groups in the Zulip organization.
Get user group subgroupsTool to retrieve subgroups of a user group.
Get user statusTool to retrieve the status currently set by a user in the Zulip organization.
Mark All Messages as ReadTool to mark all messages as read for the authenticated user.
Mark Stream as ReadTool to mark all messages in a Zulip channel as read.
Mark Topic as ReadTool to mark all messages in a topic as read.
Mute TopicTool to mute or unmute a topic in a Zulip channel.
Reactivate UserTool to reactivate a deactivated user in Zulip.
Register Push DeviceTool to register an E2EE (end-to-end encrypted) push device for mobile notifications.
Register Event QueueTool to register an event queue for receiving Zulip events.
Remove Alert WordsTool to remove alert words from the current user's configuration.
Remove AttachmentTool to delete an attachment in Zulip.
Remove Code PlaygroundTool to remove a code playground from a Zulip realm.
Remove Default StreamTool to remove a channel from default streams in Zulip.
Remove FCM TokenTool to remove an FCM registration token for Android push notifications.
Remove LinkifierTool to remove a linkifier from a Zulip realm.
Remove Navigation ViewTool to remove a navigation view in Zulip.
Remove ReactionTool to remove an emoji reaction from a Zulip message.
Render MessageTool to render a message to HTML in Zulip.
Reorder Channel FoldersTool to reorder channel folders in Zulip.
Reorder Custom Profile FieldsTool to reorder custom profile fields in Zulip.
Reorder LinkifiersTool to reorder linkifiers in Zulip.
Revoke Email InvitationTool to revoke an email invitation in Zulip.
Revoke reusable invitation linkTool to revoke a reusable invitation link for the Zulip organization.
Send MessageTool to send a message in Zulip.
Send Test NotificationTool to send a test notification to mobile device(s).
Set Typing StatusTool to set typing status in Zulip.
Set Typing Status for Message EditTool to set typing status when editing a message in Zulip.
Subscribe to ChannelTool to subscribe users to one or more Zulip channels.
Test Welcome Bot Custom MessageTool to test welcome bot custom message in Zulip.
Unsubscribe From ChannelTool to unsubscribe from one or more channels (streams) in Zulip.
Update Channel FolderTool to update a channel folder in Zulip.
Update LinkifierTool to update a linkifier in a Zulip realm.
Update MessageTool to edit a message in Zulip.
Update Message FlagsTool to update personal message flags in Zulip.
Update Message Flags for NarrowTool to update personal message flags (e.
Update Realm User Settings DefaultsTool to update realm-level defaults of user settings in Zulip.
Update Scheduled MessageTool to edit a scheduled message in Zulip.
Update SettingsTool to update user settings in Zulip.
Update StatusTool to update your status in Zulip.
Update status for userTool to update the status for a specific user in the Zulip organization.
Update ChannelTool to update a channel in Zulip.
Update SubscriptionsTool to update channel subscriptions by subscribing to new channels or unsubscribing from existing ones.
Update Subscription SettingsTool to update the user's personal settings for channels they are subscribed to.
Update user by emailTool to update a user by email address in Zulip.
Update User TopicTool to update personal preferences for a topic in a Zulip channel.

What is the Composio tool router, and how does it fit here?

What is Tool Router?

Composio's Tool Router 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 Tool Router

The tool router generates a secure MCP URL that your agents can access to perform actions.

How the Tool Router works

The Tool Router 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 Zulip 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=["zulip"],
)

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 Zulip 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 Zulip 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=["zulip"],
)

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 Zulip operations."
    ),  
    tools=[composio_toolset],
)

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

Conclusion

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

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Zulip 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 Zulip MCP Agent with another framework

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Mastra AI

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LlamaIndex

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CrewAI

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Claude Code

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Codex

Codex

Use Zulip MCP with Codex

FAQ

What are the differences in Tool Router MCP and Zulip MCP?

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

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

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

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