Repository Memory That Survives Code Changes

Repository memory is most valuable when it preserves durable reasoning behind code while avoiding outdated implementation details such as file paths or API descriptions that can quickly change. Notes should be tied to evidence through source paths, revisions, relevant questions, and links to maintained decision records, while clearly distinguishing historical observations from current claims and excluding secrets or unnecessary private data. Agents should verify repository state before relying on old notes, retain conflicts between past decisions and current implementations, and treat memory as a way to narrow investigation rather than replace source review. Memory must also account for branch, project, ownership, and workflow status differences so that experimental work, personal notes, prepared patches, and merged changes are not confused. Its reliability can be tested with controlled code changes and cross-project questions to ensure it updates references, retains useful rationale, and does not leak assumptions between scopes; filesystem-based memory should additionally be reviewed for permissions and provenance, and adoption should begin with a repeated investigation whose efficiency can be measured across sessions.

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