Apollo IO MCP Server + Claude Code: Complete MCP Integration
Apollo IO MCP Server is a MCP server that apollo.io mcp server. Get/enrich contact data for people and organizations agentically..
When integrated with Claude Code, you can:
- Enrich contact data for individuals with comprehensive profile information
- Enrich company data with detailed organizational information
- Advanced people search with extensive filtering options
This guide provides step-by-step instructions to set up Apollo IO MCP Server in Claude Code, including configuration, examples, and troubleshooting.
What You'll Achieve
After completing this setup:
- Apollo IO MCP Server will be fully integrated and operational
- You can use Apollo IO MCP Server tools directly in Claude Code
- All Apollo IO MCP Server capabilities will be available for your workflows
- Access to 7 different tools
Prerequisites
Before starting, ensure you have:
- Node.js
- npm
- Apollo.io API key
- Apollo.io API key for accessing enrichment services
- Claude Code installed and configured
- Compatible operating system (Windows, macOS, Linux)
Installation
Step 1: Install Apollo IO MCP Server
Install using npm:
npm install @agentx-ai/apollo-io-mcp-server
Verify installation:
npm list @agentx-ai/apollo-io-mcp-server
Configuration
Step 2: Configure Claude Code
- Install Claude Code
Download and install Claude Code from the official website
Visit: https://claude.ai/code
Note: Claude Code is available as a native application, not via npm
- Navigate to Project
Open terminal in your project directory where you want to use the MCP server
- Install MCP Server
Install the MCP server you want to use (e.g., via npm, pip, or other package manager)
- Configure MCP Server
Add MCP server configuration to project CLAUDE.md file or use --mcp-config flag
Note: CLAUDE.md is preferred for project-specific configuration
- Test Integration
Start Claude Code and verify MCP server is working
claude
Note: Use interactive mode to test MCP server functionality
Configuration Details
Add to your project's CLAUDE.md file:
## MCP Servers
### Apollo IO MCP Server
- **Installation**: npm
- **Configuration**: "APOLLO_IO_API_KEY": "your-apollo-io-api-key"
- **Description**: apollo.io mcp server. Get/enrich contact data for people and organizations agentically.
Claude Code will automatically detect and load MCP servers from your project context.
Examples
Once configured, you can use Apollo IO MCP Server in Claude Code:
Enrich Contact Information
Enrich a person's profile using their email address
Ask Claude Code: "Enrich the contact information for [email protected] and get their professional background"
Expected Result: Complete profile with job title, company details, social profiles, and professional background
Find Marketing Decision Makers
Search for marketing managers at technology companies
Ask Claude Code: "Find Marketing Managers at technology companies in San Francisco with 100-500 employees"
Expected Result: List of marketing professionals with contact details, company information, and role descriptions
Company Intelligence Gathering
Get comprehensive information about a target company
Ask Claude Code: "Get detailed information about Salesforce including employee count, recent hires, and current job openings"
Expected Result: Company profile with metrics, employee data, hiring trends, and job postings
Competitive Analysis
Analyze competitors and find key contacts
Ask Claude Code: "Find all companies in the CRM software space and identify their VP of Sales contacts"
Expected Result: Competitive landscape with company profiles and key decision maker contact information
Testing Your Setup
- Run claude in your project directory
- Ask Claude to list available tools and verify Apollo IO MCP Server tools are present
- Test Apollo IO MCP Server functionality by asking Claude to use specific tools
Test commands:
claude
claude --debug
Troubleshooting
Common Issues
Apollo.io API Key Invalid
Symptoms: 401 Authentication errors, API key not recognized, Access denied messages
Cause: Invalid, expired, or missing Apollo.io API key
Solution:
- Generate new API key from Apollo.io settings
- Verify APOLLO_IO_API_KEY environment variable is set
- Check API key has appropriate permissions
- Ensure no extra spaces or characters in key
Rate Limiting Errors
Symptoms: 429 Too Many Requests, API quota exceeded, Rate limit messages
Cause: Exceeded Apollo.io API rate limits
Solution:
- Check your Apollo.io plan limits and usage
- Implement delays between requests
- Upgrade Apollo.io plan for higher limits
- Optimize queries to use fewer API calls
Claude Desktop Not Detecting Server
Symptoms: No tools showing up, MCP server not connected, Configuration ignored
Cause: Incorrect claude_desktop_config.json setup
Solution:
- Verify JSON syntax in configuration file
- Check file is in correct location for your OS
- Restart Claude Desktop after configuration changes
- Test server with MCP inspector first
Search Results Empty or Limited
Symptoms: No search results, Limited contact data, Enrichment fails
Cause: Search criteria too restrictive or data not available
Solution:
- Broaden search criteria and filters
- Try different search parameters
- Check if company/person exists in Apollo database
- Verify search syntax and parameter format
NPM Installation Errors
Symptoms: Package not found, Installation failures, Dependency errors
Cause: NPM registry issues or network connectivity
Solution:
- Clear NPM cache: npm cache clean --force
- Try alternative registry: npm install --registry https://registry.npmjs.org/
- Check internet connectivity and proxy settings
- Update NPM: npm install -g npm@latest
Server Not Found
Symptoms: Command not found errors, Server tools unavailable
Cause: Server not installed or not in PATH
Solution:
- Verify server installation
- Check PATH environment variable
- Install server globally or in project
Configuration Not Loaded
Symptoms: CLAUDE.md changes not recognized, Old server config used
Cause: CLAUDE.md file not in correct location or format
Solution:
- Ensure CLAUDE.md is in project root
- Verify markdown syntax is correct
- Restart Claude Code session
Apollo IO MCP Server not appearing in Claude Code
Symptoms: Server not listed, Tools not available
Cause: Configuration or installation issue
Solution:
- Verify configuration syntax
- Check Apollo IO MCP Server installation
- Restart Claude Code
- Check logs for error messages
Next Steps
Now that Apollo IO MCP Server is integrated with Claude Code:
- Explore all Apollo IO MCP Server capabilities through Claude Code
- Check out other MCP servers that work with Claude Code
- Join the MCP community for tips and support
- Consider contributing to Apollo IO MCP Server development
Need Help?
- Search for Apollo IO MCP Server documentation
- Check the Claude Code MCP guide
- Join the MCP community discussions