APIWeaver + Claude Code: Complete MCP Integration

APIWeaver is a MCP server that An MCP server that dynamically creates MCP servers from web API configurations. This allows you to easily integrate any REST API, GraphQL endpoint, or web service into an MCP-compatible tool that can be used by AI assistants like Claude..

When integrated with Claude Code, you can:

• Register and configure APIs at runtime without server restart
• Support for REST APIs, GraphQL endpoints, and web services
• Multiple authentication methods for different API requirements

This guide provides step-by-step instructions to set up APIWeaver in Claude Code, including configuration, examples, and troubleshooting.

What You'll Achieve

After completing this setup:

• APIWeaver will be fully integrated and operational
• You can use APIWeaver tools directly in Claude Code
• All APIWeaver capabilities will be available for your workflows
• Access to 6 different tools

Prerequisites

Before starting, ensure you have:

• Claude Code installed and configured
• Compatible operating system (Windows, macOS, Linux)

Installation

Step 1: Install APIWeaver

Configuration

Step 2: Configure Claude Code

1. 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

2. Navigate to Project

Open terminal in your project directory where you want to use the MCP server

3. Install MCP Server

Install the MCP server you want to use (e.g., via npm, pip, or other package manager)

4. 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

5. 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

### APIWeaver
- **Installation**: apiweaver
- **Configuration**: 
- **Description**: An MCP server that dynamically creates MCP servers from web API configurations. This allows you to easily integrate any REST API, GraphQL endpoint, or web service into an MCP-compatible tool that can be used by AI assistants like Claude.

Claude Code will automatically detect and load MCP servers from your project context.

Examples

Once configured, you can use APIWeaver in Claude Code:

Register REST API with Authentication

Add a REST API with Bearer token authentication

Ask Claude Code: "Register the JSONPlaceholder API (https://jsonplaceholder.typicode.com) with GET and POST methods"

Expected Result: API registered successfully with auto-generated tools for posts, users, and comments endpoints

GraphQL Endpoint Integration

Connect to a GraphQL API for data querying

Ask Claude Code: "Register the GitHub GraphQL API with authentication and create tools for repository queries"

Expected Result: GraphQL endpoint configured with query tools for repositories, issues, and user data

API Testing and Validation

Test API connectivity before integration

Ask Claude Code: "Test connection to the Stripe API with my API key before registering it"

Expected Result: Connection test successful with API schema validation and endpoint verification

Multi-API Workflow

Integrate multiple APIs for complex workflows

Ask Claude Code: "Register both Twitter API and SendGrid API to create a workflow for social media monitoring and email alerts"

Expected Result: Both APIs registered with tools for tweet monitoring, email sending, and automated workflow execution

Testing Your Setup

1. Run claude in your project directory
2. Ask Claude to list available tools and verify APIWeaver tools are present
3. Test APIWeaver functionality by asking Claude to use specific tools

Test commands:

claude

claude --debug

Troubleshooting

Common Issues

API Registration Failed

Symptoms: Registration errors, Invalid API configuration, Connection timeouts

Cause: Incorrect API URL, authentication issues, or network problems

Solution:

• Verify API endpoint URL is accessible
• Check authentication credentials are valid
• Test API manually with curl or Postman first
• Ensure network connectivity and firewall settings

Authentication Not Working

Symptoms: 401 Unauthorized, 403 Forbidden, Auth token invalid

Cause: Incorrect authentication method or invalid credentials

Solution:

• Verify authentication method matches API requirements
• Check API key/token is not expired
• Confirm header format and parameter names
• Test authentication with API documentation examples

Transport Mode Not Connecting

Symptoms: Connection refused, Transport errors, Client not recognizing server

Cause: Incorrect transport configuration or port conflicts

Solution:

• Use streamable-http for modern clients
• Check port is not in use: netstat -an | grep :8000
• Verify host/port settings match client configuration
• Try different transport modes (stdio/http/sse)

Python Dependencies Missing

Symptoms: Import errors, Module not found, Package installation failures

Cause: Missing Python packages or virtual environment issues

Solution:

• Install requirements: pip install -r requirements.txt
• Create virtual environment: python -m venv apiweaver-env
• Activate environment before installation
• Upgrade pip: python -m pip install --upgrade pip

API Schema Generation Failed

Symptoms: Tool generation errors, Schema parsing failures, Endpoint mapping issues

Cause: Unsupported API format or incomplete API documentation

Solution:

• Provide OpenAPI/Swagger specification if available
• Start with simple GET endpoints first
• Manually configure complex APIs step by step
• Check API documentation for required parameters

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

APIWeaver not appearing in Claude Code

Symptoms: Server not listed, Tools not available

Cause: Configuration or installation issue

Solution:

• Verify configuration syntax
• Check APIWeaver installation
• Restart Claude Code
• Check logs for error messages

Next Steps

Now that APIWeaver is integrated with Claude Code:

• Explore all APIWeaver 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 APIWeaver development

Need Help?

• Search for APIWeaver documentation
• Check the Claude Code MCP guide
• Join the MCP community discussions