APIWeaver + JetBrains AI Assistant: 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 JetBrains AI Assistant, 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 JetBrains AI Assistant, 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 JetBrains AI Assistant
• All APIWeaver capabilities will be available for your workflows
• Access to 6 different tools

Prerequisites

Before starting, ensure you have:

• JetBrains AI Assistant installed and configured
• Compatible operating system (Windows, macOS, Linux)

Installation

Step 1: Install APIWeaver

Configuration

Step 2: Configure JetBrains AI Assistant

1. Locate your configuration file:

   • Windows: Settings > Tools > AI Assistant > Model Context Protocol (MCP)
   • macOS: Preferences > Tools > AI Assistant > Model Context Protocol (MCP)
   • Linux: Settings > Tools > AI Assistant > Model Context Protocol (MCP)

2. Add server configuration:

{
  "mcpServers": {
    "apiweaver": {
      "command": "npx",
      "args": ["-y", "apiweaver"],
      "env": {
        
      }
    }
  }
}

3. Restart JetBrains AI Assistant

Completely quit and restart JetBrains AI Assistant to load the new configuration.

Examples

Once configured, you can use APIWeaver in JetBrains AI Assistant:

Register REST API with Authentication

Add a REST API with Bearer token authentication

Ask JetBrains AI Assistant: "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 JetBrains AI Assistant: "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 JetBrains AI Assistant: "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 JetBrains AI Assistant: "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. Start a new conversation in JetBrains AI Assistant
2. Ask JetBrains AI Assistant to list available tools
3. Try using APIWeaver functionality

Test prompts:

• "Type / and look for APIWeaver tools in the command list"
• "Ask AI Assistant to use APIWeaver for a specific task"
• "Check the MCP settings page for connection status indicator"

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

MCP Server Not Connecting

Symptoms: Server status shows disconnected, Tools not appearing in chat, Connection timeout

Cause: Server configuration incorrect or server not starting

Solution:

• Verify server command is correct and executable
• Check environment variables are set properly
• View MCP logs: Help > Show Log in Explorer > mcp folder
• Test server command in terminal manually

Remote Server Not Supported

Symptoms: HTTP server not connecting, SSE transport errors

Cause: AI Assistant only supports stdio transport for client connections

Solution:

• Use mcp-remote proxy for remote servers
• Configuration: npx -y mcp-remote@latest https://server-url/endpoint
• This wraps HTTP/SSE in stdio transport

Import from Claude Not Working

Symptoms: No servers imported, Configuration empty after import

Cause: Claude Desktop config file not found or in unexpected location

Solution:

• Verify Claude Desktop is installed
• Check config exists at ~/Library/Application Support/Claude/claude_desktop_config.json (macOS)
• Or %APPDATA%/Claude/claude_desktop_config.json (Windows)
• Manually copy configuration if auto-import fails

External Client Cannot Connect to IDE Server

Symptoms: Client shows MCP server unavailable, Connection refused

Cause: IDE MCP server not enabled or client not configured

Solution:

• Enable MCP Server in Settings > Tools > MCP Server
• Use Auto-Configure for supported clients
• Restart both IDE and external client
• Check firewall allows local connections

Brave Mode Commands Not Running

Symptoms: Terminal commands require confirmation, Workflow interrupted by prompts

Cause: Brave mode not enabled

Solution:

• Enable in Settings > Tools > MCP Server
• Check "Run shell commands without confirmation (brave mode)"
• Use with caution - commands run without confirmation

APIWeaver not appearing in JetBrains AI Assistant

Symptoms: Server not listed, Tools not available

Cause: Configuration or installation issue

Solution:

• Verify configuration syntax
• Check APIWeaver installation
• Restart JetBrains AI Assistant
• Check logs for error messages

Next Steps

Now that APIWeaver is integrated with JetBrains AI Assistant:

• Explore all APIWeaver capabilities through JetBrains AI Assistant
• Check out other MCP servers that work with JetBrains AI Assistant
• Join the MCP community for tips and support
• Consider contributing to APIWeaver development

Need Help?

• Search for APIWeaver documentation
• Check the JetBrains AI Assistant MCP guide
• Join the MCP community discussions