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.