WebMCP Tool Builder Kit

What you get

Everything needed to build and publish custom MCP tools that LLMs can discover and invoke through a standard interface.

Protocol reference

• MCP overview and core concepts
• JSON-RPC message formats (tools/list, tools/call)

Starter templates

• Python tool server (stdio transport)
• Node.js tool server (stdio transport)
• Minimal echo tool example

Working examples

• Weather tool using Open-Meteo API (no API key required)

Documentation

• Step-by-step build guide
• Testing instructions
• Publishing guide (pip/npm packaging)