Speclock

SpecLock is an open-source AI constraint engine designed to enforce project-specific rules and coding restrictions during AI-assisted coding sessions. It prevents autonomous or generative AI tools (such as Claude Code, Cursor, Windsurf, Cline, Codex) from making changes to codebases that violate explicit user-set constraints. The tool ensures that instructions like 'never touch the auth system' or 'database must stay PostgreSQL' are respected, using semantic understanding rather than simple keyword matching. It integrates via MCP, supports health checks, pre-commit hooks, and provides features like violation receipts, public sharing, and enforcement mode options.