How to integrate Gradium MCP with Google ADK

This guide walks you through connecting Gradium to Google ADK using the Composio tool router. By the end, you'll have a working Gradium agent that can list voices, create pronunciation dictionaries, update pronunciation guides, check your usage, and view credits through natural language commands. This guide will help you understand how to give your Google ADK agent real control over a Gradium account through Composio's Gradium MCP server. Before we dive in, let's take a quick look at the key ideas and tools involved.

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Gradium is a low-latency voice AI platform for speech generation, transcription, voice management, and pronunciation tools. Use it to build real-time voice apps with fast, natural audio workflows.

9 Tools

Introduction

This guide walks you through connecting Gradium to Google ADK using the Composio tool router. By the end, you'll have a working Gradium agent that can list voices, create pronunciation dictionaries, update pronunciation guides, check your usage, and view credits through natural language commands.

This guide will help you understand how to give your Google ADK agent real control over a Gradium account through Composio's Gradium 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 a Gradium account set up and connected to Composio
  • Install the Google ADK and Composio packages
  • Create a Composio Tool Router session for Gradium
  • Build an agent that connects to Gradium through MCP
  • Interact with Gradium 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 Gradium MCP server, and what's possible with it?

The Gradium MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Gradium account. It provides structured and secure access to your voice catalog, pronunciation dictionaries, credit balance, and usage data, so your agent can browse voices, manage pronunciation rules, check credits, and review usage on your behalf.

  • Voice discovery: Have your agent list available custom and public voices, then retrieve details about a selected voice.
  • Pronunciation dictionary management: Let the agent create language-specific pronunciation dictionaries, add rewrite rules, and update existing dictionaries.
  • Pronunciation dictionary review and cleanup: Direct your agent to list or inspect pronunciation dictionaries and delete ones you no longer need.
  • Credits and usage tracking: Instruct your agent to check your current credit balance, billing period details, and aggregate usage across sessions, messages, text, and audio duration.

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 Gradium 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=["gradium"],
)

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 Gradium 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 Gradium 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=["gradium"],
)

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

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

Conclusion

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

Key takeaways:

  • The Tool Router approach dynamically routes requests to the appropriate Gradium 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 Gradium action and event your agent gets out of the box.

Create Pronunciation Dictionary

Create a language-specific pronunciation dictionary with optional rewrite rules.

Delete Pronunciation Dictionary

Permanently delete one pronunciation dictionary by UID.

Get Credits

Get the connected Gradium subscription's current credit balance and billing-period metadata.

Get Pronunciation Dictionary

Retrieve one pronunciation dictionary and its complete rewrite rule set by UID.

Get Usage Summary

Retrieve aggregate Gradium session, message, text, audio-duration, and consumed-credit usage totals.

Get Voice

Retrieve metadata for one Gradium catalog or custom voice by its UID.

List Pronunciation Dictionaries

List pronunciation dictionaries for the connected organization, optionally filtered by language.

List Voices

List custom voices and, by default, Gradium's public voice catalog, returning voice IDs and metadata for later selection.

Update Pronunciation Dictionary

Update pronunciation dictionary metadata and optionally replace its complete rewrite rule set.

FRAMEWORKS

How to build Gradium MCP Agent with another framework

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Gradium MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Gradium MCP with Claude Agent SDK

Claude Code logo

Claude Code

Use Gradium MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Gradium MCP with Claude Cowork

Codex logo

Codex

Use Gradium MCP with Codex

OpenClaw logo

OpenClaw

Use Gradium MCP with OpenClaw

Hermes logo

Hermes

Use Gradium MCP with Hermes

CLI logo

CLI

Use Gradium MCP with CLI

LangChain logo

LangChain

Use Gradium MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Gradium MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Gradium MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Gradium MCP with LlamaIndex

CrewAI logo

CrewAI

Use Gradium MCP with CrewAI

FAQ

Frequently asked questions

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

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

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