convention.sh is a hosted MCP server with 27 hand-tuned TypeScript conventions. Coding agents like Claude Code, Cursor, Codex, and Amp pull conventions just-in-time — so they don't thrash and you don't pay for tokens you don't need. Benchmarked on Claude Opus 4.7 to produce production-ready code 59% faster, 44% cheaper, and with 84% fewer input tokens vs baseline. Free tier available, no credit card required.