MCP Server Specification

Based on the Model Context Protocol documentation for building servers.

Overview

MCP (Model Context Protocol) servers expose capabilities to LLM clients through three main types:

1. Resources - File-like data that can be read by clients
2. Tools - Functions that can be called by the LLM (with user approval)
3. Prompts - Pre-written templates that help users accomplish specific tasks

This specification focuses on building MCP servers using Python.

Core Concepts

Logging in MCP Servers

Important: For STDIO-based servers (most common), never write to stdout as it corrupts JSON-RPC messages.