sgroy10/speclock
AI Constraint Engine by Sandeep Roy — stops AI from breaking what you locked. 100/100 on Claude's adversarial test suite. 42 MCP tools. Works with Bolt.new, Lovable, Claude Code, Cursor. Free & open source.
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<h3 align="center">Your AI keeps breaking things you told it not to touch.<br/>SpecLock makes it stop.</h3>
<p align="center"> <a href="https://www.npmjs.com/package/speclock"></a> <a href="https://www.npmjs.com/package/speclock"></a> <a href="https://opensource.org/licenses/MIT"></a> <a href="https://modelcontextprotocol.io"></a> </p>
<p align="center"> <a href="https://sgroy10.github.io/speclock/">Website</a> · <a href="https://www.npmjs.com/package/speclock">npm</a> · <a href="https://smithery.ai/servers/sgroy10/speclock">Smithery</a> · <a href="https://github.com/sgroy10/speclock">GitHub</a> </p>
<p align="center"><strong>Developed by <a href="https://github.com/sgroy10">Sandeep Roy</a></strong> · Free & Open Source (MIT License)</p>
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You: "Never touch the auth system"
AI: 🔒 Locked.
... 5 sessions later ...
You: "Add social login to the login page"
AI: ⚠️ BLOCKED — violates lock "Never touch the auth system"
Matched: auth → authentication (synonym), login → auth (concept)
Confidence: 100%
Should I find another approach?100/100 on Claude's independent test suite. 929 tests across 18 suites. 0 false positives. 15.7ms per check. Gemini Flash hybrid, Spec Compiler, Code Graph, Typed Constraints, Python SDK, ROS2 integration.
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npx speclock setup --goal "Build my app"That's it. On