Tomba MCP

Tomba, your unique B2B email finder and verifier, provides a distinctive lead database for effortless and effective outreach scaling.

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Tomba.io MCP Server

A Model Context Protocol (MCP) server for integrating with the Tomba.io API. This server provides comprehensive email discovery, verification, and enrichment capabilities through a standardized MCP interface.

Features

Tools (8 available)

Resources (5 available)

  • tomba://api/status - API status and account info
  • tomba://domain/{domain} - Domain information
  • tomba://email/{email} - Email information
  • tomba://docs/api - API documentation
  • tomba://docs/tools - Tools documentation

Prompts (7 pre-built workflows)

  • find_contact - Find complete contact info for a person
  • verify_email_list - Batch verify email addresses
  • research_company - Research company contacts and structure
  • enrich_lead - Enrich a lead with all available data
  • find_journalists - Find journalist contacts from articles
  • finder_phone - Find phone numbers for contacts
  • validate_phone - Validate a phone number

Transport Options

  • stdio - Standard input/output (default, for Claude Desktop)
  • http - HTTP server with REST endpoints

Installation

Prerequisites

  • Node.js 18 or higher
  • npm or yarn
  • Tomba API account (Sign up here)

Option 1: Install via NPX (Recommended)

The easiest way to use the Tomba MCP server is via npx, which doesn't require cloning the repository:

macOS/Linux

Add to your claude_desktop_config.json (~/Library/Application Support/Claude/claude_desktop_config.json):

{
    "mcpServers": {
        "tomba": {
            "command": "npx",
            "args": ["-y", "tomba-mcp-server"],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Windows

Add to your claude_desktop_config.json (%APPDATA%\Claude\claude_desktop_config.json):

{
    "mcpServers": {
        "tomba": {
            "command": "npx",
            "args": ["-y", "tomba-mcp-server"],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Note: The -y flag automatically accepts the installation prompt, and npx will always fetch the latest version.

Option 2: Install from Source

If you want to modify the server or contribute to development:

# Clone the repository
git clone https://github.com/tomba-io/tomba-mcp-server.git
cd tomba-mcp-server

# Install dependencies
yarn install

# Build the project
yarn build

Configuration

Claude Desktop Setup

To use this server with Claude Desktop, add the configuration to your claude_desktop_config.json file.

Using NPX (Recommended)

This method automatically uses the latest published version:

macOS/Linux (~/Library/Application Support/Claude/claude_desktop_config.json):

{
    "mcpServers": {
        "tomba": {
            "command": "npx",
            "args": ["-y", "tomba-mcp-server"],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Windows (%APPDATA%\Claude\claude_desktop_config.json):

{
    "mcpServers": {
        "tomba": {
            "command": "npx",
            "args": ["-y", "tomba-mcp-server"],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Using Local Installation

If you've built from source, use the absolute path to your installation:

macOS/Linux:

{
    "mcpServers": {
        "tomba": {
            "command": "node",
            "args": ["/ABSOLUTE/PATH/TO/tomba-mcp-server/server/index.js"],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Windows:

{
    "mcpServers": {
        "tomba": {
            "command": "node",
            "args": [
                "C:\\ABSOLUTE\\PATH\\TO\\tomba-mcp-server\\server\\index.js"
            ],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Important Notes:

  • Replace your-api-key-here and your-secret-key-here with your actual Tomba API credentials
  • For local installation, replace /ABSOLUTE/PATH/TO/tomba-mcp-server with the full path to your installation directory
  • Restart Claude Desktop after updating the configuration

Getting Tomba API Credentials

  1. Visit https://tomba.io
  2. Sign up for an account or log in
  3. Navigate to your dashboard
  4. Go to API settings
  5. Copy your API Key and Secret Key

Alternative: Using HTTP Transport

For HTTP transport with npx:

{
    "mcpServers": {
        "tomba": {
            "command": "npx",
            "args": [
                "-y",
                "tomba-mcp-server",
                "--transport",
                "http",
                "--port",
                "3000"
            ],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

For HTTP transport with local installation:

{
    "mcpServers": {
        "tomba": {
            "command": "node",
            "args": [
                "/ABSOLUTE/PATH/TO/tomba-mcp-server/server/index.js",
                "--transport",
                "http",
                "--port",
                "3000"
            ],
            "env": {
                "TOMBA_API_KEY": "your-api-key-here",
                "TOMBA_SECRET_KEY": "your-secret-key-here"
            }
        }
    }
}

Usage

Command-line Options

Usage: tomba-mcp-server [options]

Options:
  --transport <type>    Transport type: 'stdio' or 'http' (default: stdio)
  --port <number>       Port number for HTTP transport (default: 3000)
  --help                Show help message

Environment Variables:
  TOMBA_API_KEY         Your Tomba API key (required)
  TOMBA_SECRET_KEY      Your Tomba secret key (required)

Examples:
  # Run with stdio transport (default)
  node server/index.js

  # Run with HTTP transport on default port (3000)
  node server/index.js --transport http

  # Run with HTTP transport on custom port
  node server/index.js --transport http --port 8080

Standalone HTTP Server

You can also run the server as a standalone HTTP service:

export TOMBA_API_KEY="your-api-key"
export TOMBA_SECRET_KEY="your-secret-key"
node server/index.js --transport http --port 3000

HTTP API Endpoints

  • POST /mcp - Send JSON-RPC requests
  • GET /mcp - Server-Sent Events for notifications (requires X-Session-Id header)
  • DELETE /mcp - Terminate a session (requires X-Session-Id header)
  • GET /health - Health check endpoint
  • GET /sessions - List active sessions (requires authentication)

Example HTTP Request

curl -X POST http://localhost:3000/mcp \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "tools/call",
    "params": {
      "name": "email_finder",
      "arguments": {
        "domain": "stripe.com",
        "firstName": "Patrick",
        "lastName": "Collison"
      }
    },
    "id": 1
  }'

🔧 Development

Development Commands

# Run in development mode
yarn dev

# Build the project
yarn build

# Run tests
yarn test

# Run tests in watch mode
yarn test:watch

# Run tests with coverage
yarn test:coverage

# Lint code
yarn lint

# Fix linting errors
yarn lint:fix

🔍 Debugging & Testing

MCP Inspector (Recommended)

The easiest way to test and debug your MCP server:

# Build and launch MCP Inspector
yarn debug

This opens a web interface where you can:

  • 📋 View all available tools
  • 🧪 Test tools interactively
  • 📊 Inspect requests/responses
  • 🐛 Debug in real-time

Alternative Debug Methods

# Debug TypeScript directly
yarn debug:dev

# Run integration tests
yarn test:integration

# Manual testing
yarn build
echo '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' | node server/index.js

VS Code Debugging

If using VS Code, use the included debug configurations:

  • Debug MCP Server: Debug the compiled JavaScript
  • Debug TypeScript: Debug TypeScript source directly
  • Debug with Inspector: Debug with MCP Inspector
  • Run Tests: Debug Jest tests

See DEBUG_GUIDE.md for comprehensive debugging instructions.

🧪 Testing Individual Tools

1. Domain Search

Search for email addresses associated with a domain name.

{
    "name": "domain_search",
    "arguments": {
        "domain": "example.com",
        "limit": 10,
        "page": 1,
        "department": "engineering",
        "country": "US"
    }
}

Response:

{
    "domain": "example.com",
    "emails": [
        {
            "email": "john.doe@example.com",
            "first_name": "John",
            "last_name": "Doe",
            "position": "Developer",
            "department": "Engineering",
            "type": "personal",
            "confidence": 95
        }
    ],
    "total": 1
}

2. Email Finder

Generate likely email addresses from domain, first name, and last name.

{
    "name": "email_finder",
    "arguments": {
        "domain": "example.com",
        "firstName": "John",
        "lastName": "Doe"
    }
}

3. Email Verifier

Verify email address deliverability and check database presence.

{
    "name": "email_verifier",
    "arguments": {
        "email": "john.doe@example.com"
    }
}

Response:

{
    "email": {
        "email": "john.doe@example.com",
        "gibberish": false,
        "disposable": false,
        "webmail": false,
        "result": "deliverable",
        "score": 95
    }
}

4. Email Enrichment

Enrich an email address with additional contact information.

{
    "name": "email_enrichment",
    "arguments": {
        "email": "john.doe@example.com"
    }
}

5. Author Finder

Find email addresses of article authors from a URL.

{
    "name": "author_finder",
    "arguments": {
        "url": "https://example.com/article"
    }
}

6. LinkedIn Finder

Find email addresses from LinkedIn profile URLs.

{
    "name": "linkedin_finder",
    "arguments": {
        "url": "https://linkedin.com/in/johndoe"
    }
}

7. Phone Finder

Search for phone numbers based on email, domain, or LinkedIn profile.

{
    "name": "phone_finder",
    "arguments": {
        "email": "john.doe@example.com"
    }
}

8. Phone Validator

Validate phone numbers and check carrier information.

{
    "name": "phone_validator",
    "arguments": {
        "phone": "+1234567890"
    }
}

Troubleshooting

Server Not Starting in Claude Desktop

  1. Check Node.js version: Ensure you have Node.js 18 or higher

    node --version

  2. Using NPX:

    • Ensure you have a stable internet connection for the first run
    • The -y flag should auto-accept the installation
    • NPX will cache the package after first use

  3. Using Local Installation:

    • Verify absolute path is correct in your config
    • Ensure server/index.js exists: ls -la server/index.js
    • Make sure you ran yarn build successfully

  4. Verify API credentials: Ensure your Tomba API keys are correct

  5. Check Claude logs:

    • macOS: ~/Library/Logs/Claude/mcp*.log
    • Windows: %APPDATA%\Claude\logs\mcp*.log

NPX-Specific Issues

"npx command not found":

  • Ensure npm is installed: npm --version
  • NPX comes with npm 5.2.0+, update if needed: npm install -g npm

Package not found:

  • Verify the package is published: npm view tomba-mcp-server
  • Try clearing npm cache: npm cache clean --force

Always downloading package:

  • This is normal behavior with -y flag
  • NPX caches the package after first download
  • For a permanent installation, use local installation method

Authentication Errors

  • Verify your API keys at https://tomba.io/dashboard
  • Ensure environment variables are properly set in the config
  • Check that your API subscription is active

Tools Not Responding

  • Check your Tomba API rate limits
  • Verify network connectivity
  • Review server logs for error messages

About Tomba

Founded in 2020, Tomba prides itself on being the most reliable, accurate, and in-depth source of email address data available anywhere. We process terabytes of data to produce our Email finder API.

image

Contributing

  1. Fork it (https://github.com/tomba-io/tomba-mcp-server/fork)
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request

License

Please see the License file for more information.

Support

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