AI Cross-Repo Audit Uncovers Bug Where a Repair Tool Could Overwrite Its Own Source

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A developer ran a cross-repository audit using an AI system called Fable5 across seven interdependent tool repos — five public and two private — that had never been examined together. The audit deployed separate scanning subagents for each repo plus an independent verifier that overturned four of the scanners' conclusions. Three critical failures were found that were invisible in any single repo and only emerged from examining the full system together. The most serious: a drift-repair tool designed to sync local file copies could silently write through a Windows filesystem junction straight into the canonical source repo, risking overwriting uncommitted work on feature branches. The audit also surfaced an orphaned cross-repo contract and a documentation-versus-enforcement mismatch that left different maintainers with conflicting understandings of the same rule.

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