culprit

git bisect thinking for prompts: compare what changed in behavior, not only in text.

pip install culprit-ai

Quickstart

cp examples/quickstart/culprit.yaml .
cp -r examples/quickstart/evals .
export OPENAI_API_KEY="..."
culprit diff HEAD~1 HEAD --eval-set evals/summarizer.yaml

Features

Semantic diff: an LLM summary backed by per-case eval evidence.
Behavioral bisect: binary-search prompt history to locate the first regression.
Semantic merge (experimental): conservatively combine compatible branch edits and verify the result before staging it.
Git-native architecture: prompt history stays in ordinary Git.
Provider adapters for OpenAI, Anthropic, and arbitrary OpenAI-compatible endpoints.
Content-addressed evaluation cache to avoid repeat API spend.
culprit check warnings for common secret and PII patterns.

Why not just use X?

Tool	Best fit	How culprit differs
Promptfoo	Broad prompt/model evaluation and red teaming	culprit centers comparisons on Git revisions and commit history.
Confident AI / DeepEval	Evaluation frameworks and hosted workflows	culprit is a local Git wrapper with zero required backend.
promptvc	Prompt versioning workflows	culprit leaves version storage entirely to Git and adds eval-backed diffs.

These tools can complement culprit; the comparison is about workflow focus, not superiority.

Contributing

Phase 1 improvements are open for contribution. See CONTRIBUTING.md, including adapter guidance and suggested first issues.

Released under the MIT License.

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