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Git Worktree Trick Lets AI Agents Debug Code at the Exact Moment a Crash Occurred

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AI coding agents like Cursor, Copilot, and Claude Code typically analyze code at the current HEAD, meaning they miss bugs that existed in an earlier version running when a production crash actually happened. A developer on DEV Community has outlined a technique using Git's built-in worktree feature to create isolated, read-only snapshots of a repository at any historical commit. The approach resolves fuzzy time references — such as 'three hours ago' or 'v2.4.1' — into specific commit SHAs, then spins up a temporary worktree for the agent to analyze before cleaning it up automatically. The author packaged this logic into a portable Markdown-based skill definition called temporal-debug-skill, which requires no additional dependencies and works with any agent that can execute shell commands. The goal is to give AI debugging tools accurate historical context so they stop confidently diagnosing code that did not exist at the time of the incident.

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