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Build an MCP Server in Python with FastMCP
A working MCP server in twenty lines, then the parts that only break in production: tool design, validation, error messages, testing and security.
Topic
A working MCP server in twenty lines, then the parts that only break in production: tool design, validation, error messages, testing and security.
MCP's 2026-07-28 revision drops sessions and the initialize handshake. What breaks, what replaces it, and the exact migration order for your server.