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Markdown Gatekeeper tool prevents AI agents from acting on outdated project docs

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A new open-source tool called Markdown Gatekeeper aims to solve a common problem in long-running software repositories where outdated documentation can mislead AI coding agents. When tools like Codex or Claude operate across multiple sessions, old architecture notes can be mistakenly treated as current plans. The tool enforces a single authoritative revision per topic, keeping competing documents marked as proposals and superseded files still accessible for reference. Markdown Gatekeeper works locally using plain Markdown and Git, requiring no cloud account or external service. It is available to install via npm from the nanlogic GitHub repository.

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