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How to connect Tomba to Claude

Connect Claude Web, Desktop and Cowork to Tomba MCP. Find all leads from example.com domain, check if this email is disposable, and more using natural language, with authentication handled for you.

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Tomba is an Email Finder for B2B sales and email marketing. Find and verify professional emails to boost your outreach results.

10 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Tomba account to Claude via Composio Connect, enabling it to find all leads from example.com domain, check if this email is disposable, list your current API keys in Tomba, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Tomba with

Claude CodeOpenAI Agents SDKClaude Agent SDKCodexOpenClawHermesAtomic AgentGoogle ADKLangChainVercel AI SDKMastra AILlamaIndexCrewAIPydantic AIAutoGen

Connecting Tomba to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Tomba account

Back in Claude, ask it to connect to Tomba or give it any Tomba-related task.

For example, ask Claude to:

  • "Find all leads from example.com domain"
  • "Check if this email is disposable"
  • "List your current API keys in Tomba"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Tomba account is ready to use.

What is the Tomba Claude Connector, and what's possible with it?

The Tomba MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Tomba account. It provides structured and secure access to your B2B email finding, lead management, and account configuration tools, so your agent can perform actions like discovering leads, managing lists, validating domains, and monitoring account usage on your behalf.

  • Lead discovery and enrichment: Ask your agent to list available lead attributes or add new leads directly into your Tomba account for streamlined outreach.
  • Lead list management: Effortlessly retrieve, update, or delete lead lists, helping you stay organized and keep your data current.
  • Domain validation and status checks: Have your agent check if a domain is webmail or disposable to ensure better deliverability and lead quality.
  • API key and account management: Direct your agent to list, create, or revoke API keys, and review usage statistics to keep your Tomba integration secure and efficient.
  • Usage monitoring and reporting: Let your agent fetch up-to-date API usage statistics, keeping you informed about your plan limits and consumption.

Troubleshooting

1. Why does Claude not use the Composio connector for Tomba?

The connector can show as connected, but Claude must use it in each Tomba conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Tomba again.

2. Why does Claude show an MCP server error before Tomba connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Tomba.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Tomba.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Tomba authorization link not work?

The Composio connector is one server. Your Tomba account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Tomba connection.
  • Composio creates a fresh Tomba authorization link.
  • Open that link in your browser and finish the Tomba sign-in.

4. Why do Tomba actions fail after they worked before?

The Tomba connection can expire or lose permission.

  • Ask Claude to inspect the Tomba connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Tomba account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Tomba.
  • If the action still fails with a permission error, check that the connected account has that permission in Tomba itself.

5. How do I switch to a different Tomba account?

Claude can manage the Tomba connection for you.

  • Ask Claude to disconnect or delete the current Tomba account.
  • Ask Claude to connect Tomba again.
  • Open the new Composio authorization link for Tomba.
  • Sign in with the other Tomba account in the browser.
  • After the account connects, ask Claude to retry the Tomba task.

6. Why is my Tomba connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Tomba connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Tomba tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Tomba.
TOOLS

Supported Tools

Every Tomba action and event your agent gets out of the box.

List Lead Attributes

Retrieves all custom lead attributes defined in your Tomba account.

Domain Status

Tool to check if a domain is webmail or disposable.

Delete API Key by ID

Tool to delete an API key by its numeric ID.

List API Keys

Tool to list all API keys.

Create Lead

Create a new lead in Tomba's lead database.

List Leads

Tool to list all leads.

Delete Leads List by ID

Tool to delete a leads list by ID.

List Lead Lists

Tool to list all lead lists.

Update Leads List

Tool to update a leads list's name by ID.

Get Usage Statistics

Tool to get API usage statistics.

FRAMEWORKS

How to build Tomba MCP Agent with another framework

Claude Code logo

Claude Code

Use Tomba MCP with Claude Code

OpenAI Agents SDK logo

OpenAI Agents SDK

Use Tomba MCP with OpenAI Agents SDK

Claude Agent SDK logo

Claude Agent SDK

Use Tomba MCP with Claude Agent SDK

Codex logo

Codex

Use Tomba MCP with Codex

OpenClaw logo

OpenClaw

Use Tomba MCP with OpenClaw

Hermes logo

Hermes

Use Tomba MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Tomba MCP with Atomic Agent

Google ADK logo

Google ADK

Use Tomba MCP with Google ADK

LangChain logo

LangChain

Use Tomba MCP with LangChain

Vercel AI SDK logo

Vercel AI SDK

Use Tomba MCP with Vercel AI SDK

Mastra AI logo

Mastra AI

Use Tomba MCP with Mastra AI

LlamaIndex logo

LlamaIndex

Use Tomba MCP with LlamaIndex

CrewAI logo

CrewAI

Use Tomba MCP with CrewAI

Pydantic AI logo

Pydantic AI

Use Tomba MCP with Pydantic AI

AutoGen logo

AutoGen

Use Tomba MCP with AutoGen

FAQ

Frequently asked questions

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

Yes, you can. Claude Cowork 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 Tomba tools.

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

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