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.
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.
Semantic merge remains a documented roadmap phase, not an implemented command.

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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