How I Built an MCP Server That Helps AI Coding Agents Apply Design Patterns Correctly

Giving AI agents precise structural constraints and anti-pattern warnings so they generate maintainable code instead of "works but smells" implementations. The explosion of AI coding agents — Claude Code, Cursor, GitHub Copilot, Windsurf, and others — has dramatically increased developer velocity. Yet a common frustration remains: these agents excel at producing code that works , but often ignore long-term maintainability, proper separation of concerns, and established design patterns. They migh