SIGN UPLOG IN
X (Twitter)LinkedInGitHubDiscordYouTube

How to integrate Finmei MCP with Google ADK

Connect Google ADK to Finmei MCP. Create an invoice for new client acme corp, list all unpaid invoices from last month, and more using natural language, with authentication handled for you.

Get started for freeGet a demo
Finmei logoFinmei
Api Key

Finmei is an invoicing tool that simplifies billing, invoice management, and expense tracking. Ideal for automating and organizing your business finances in one place.

24 Tools

Introduction

This guide walks you through connecting Finmei to Google ADK using the Composio tool router. By the end, you'll have a working Finmei agent that can create and update invoices, track expenses and payments, manage customers and products, and download invoice PDFs through natural language commands.

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

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

Also integrate Finmei with

Claude CodeClaude CoworkOpenAI Agents SDKClaude Agent SDKGrok BotCodexOpenClawHermesAtomic AgentLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

TL;DR

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

The Finmei MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Finmei account. It provides structured and secure access to your invoicing and expense data, so your agent can perform actions like creating invoices, managing customers, tracking payments, and handling products on your behalf.

  • Smart invoice creation and management: Ask your agent to generate new invoices, list all existing invoices, or delete outdated ones—helping you stay on top of billing effortlessly.
  • Customer record management: Let your agent list all your customers, search for specific records, or delete customers no longer in your system, streamlining client data administration.
  • Payment tracking and retrieval: Retrieve payment details, verify payment statuses, or remove obsolete payments to keep your financial records accurate and up to date.
  • Product catalog maintenance: Easily fetch detailed product information or remove products from your catalog as your offerings evolve, all via agent commands.
  • Multi-currency support: Ask your agent to list all available currencies before creating invoices, ensuring transactions are processed in the correct denomination for your business needs.

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 Finmei 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=["finmei"],
)

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 Finmei 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 Finmei 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=["finmei"],
)

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

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

Conclusion

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

Key takeaways:

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

Create Expense

Tool to create a new expense with file upload (receipt or invoice).

Create Invoice

Creates a new invoice in Finmei with buyer information and line items.

Delete Customer

Deletes a Finmei customer record by its ID.

Delete Invoice

Tool to delete an invoice.

Delete Payment

Attempts to delete a payment record by its unique identifier.

Delete Product

Deletes a product from the Finmei catalog by its ID, for example to remove an obsolete or duplicate product.

Download Expense File

Tool to download the file associated with an expense.

Download Invoice PDF

Tool to download an invoice as a PDF file.

Get Expense by ID

Tool to retrieve a single expense by its ID.

Get Invoice by ID

Tool to retrieve a single invoice by its ID.

Get Payment

Looks up Finmei payment details using a payment ID, such as after creating a payment.

Get Product by ID

Tool to retrieve a product by its ID.

Get Profile

Tool to retrieve main information about the business to which the API token is assigned.

List Currencies

Tool to list all currencies supported by Finmei.

List Customers

Lists Finmei customers for browsing or searching, with optional search and sorting.

List Expenses

Tool to list all expenses for the business.

List Invoices

Tool to list invoices.

List Payments

Lists payment records with optional date filters and limit-and-offset pagination.

List Products

Lists Finmei products for browsing or filtering the catalog.

Update Customer

Tool to update an existing customer's details.

Update Expense

Updates an existing expense's date, total, currency, and seller.

Update Expense File

Updates the file attachment of an existing expense in Finmei.

Update Invoice

Tool to update an existing invoice in Finmei.

Update Product

Updates a product's name, description, price, or currency by ID, requiring at least one update field.

FRAMEWORKS

How to build Finmei MCP Agent with another framework

Claude Code logo

Claude Code

Use Finmei MCP with Claude Code

Claude Cowork logo

Claude Cowork

Use Finmei MCP with Claude Cowork

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Finmei MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Finmei MCP with Claude Agent SDK

Grok Bot logo

Grok Bot

Use Finmei MCP with Grok Bot

Codex logo

Codex

Use Finmei MCP with Codex

OpenClaw logo

OpenClaw

Use Finmei MCP with OpenClaw

Hermes logo

Hermes

Use Finmei MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Finmei MCP with Atomic Agent

LangChain logo

LangChain

Use Finmei MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Finmei MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Finmei MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Finmei MCP with LlamaIndex

CrewAI logo

CrewAI

Use Finmei MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Finmei MCP with Pydantic AI

AutoGen logo

AutoGen

Use Finmei MCP with AutoGen

FAQ

Frequently asked questions

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

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

Start with Finmei.It takes 30 seconds.

Managed auth, hosted MCP servers, and every Finmei tool your agent needs.Free to start.

Start building