If you have spent the last few months building projects with AI coding assistants (Antigravity, Claude Code, Cursor, Copilot), you have likely experienced this specific frustration:
You prompt an agent to build a feature or fix a bug. The agent writes tests. You run pytest, and all green checkmarks appear with 100% line coverage. You feel confident and push to production — only to discover after deployment that the tests were completely hollow and missed critical edge-case logic.
Line coverage measures whether a line of code was executed, not whether its logic was actually asserted.
To solve this, I built and open-sourced DeployProof — a deterministic pre-push verification tool for Python that catches hollow test suites, hallucinated dependencies, and security traps in seconds before code leaves your local machine.
The Illusion of Green Line Coverage
