Speclock

Speclock is an open-source MCP (Model Context Protocol) server that acts as an AI constraint engine, enforcing project-specific rules (such as those in CLAUDE.md and .cursorrules) across AI coding sessions and tools. By integrating with AI assistants like Claude Code, Cursor, Windsurf, and similar MCP-compatible clients, Speclock semantically analyzes actions and blocks changes that violate user-defined rules. It supports developer workflows with over 50 available MCP tools, high coverage testing, and seamless setup for rule enforcement, making it valuable for teams and organizations aiming for code safety, quality, and policy adherence in AI-assisted coding environments.