Git-tracked

Prompt files in repo (YAML, TOML, plain text). Diff on change. Code review. Rollback on regression.

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Tag versions

Semantic version or hash. Log which version served each request. Reproducibility on incidents.

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Eval regression

CI runs eval suite on every PR. Fail if metric drops. Same as unit tests.

Prompt registries

PromptLayer, Humanloop, LangSmith host prompts. Version + track. Trade: less repo control.