Jeff is listed as Open Source. Check https://github.com/Alurith/jeff for the current plan limits, as vendors change pricing frequently.

Jeff

Q: What is Jeff?

Jeff is a code AI tool listed on Use AI Tools. Jeff is a read-only command line code review tool from Alurith, written in Go, that uses Jev decision models to review changes. It reads a diff and reports issues without writing to your repository.

Q: What is Jeff best for?

Jeff is commonly used for Developers who want a second pass before opening a PR, Teams that prefer read-only tooling in CI, Reviewers who want findings without an agent editing code. It supports English.

Code🔥 Intermediate✅ Global access

Developers who want a second pass before opening a PRTeams that prefer read-only tooling in CIReviewers who want findings without an agent editing code

Open SourceEnglish

Jeff is a read-only command line code review tool from Alurith, written in Go, that uses Jev decision models to review changes. It reads a diff and reports issues without writing to your repository.

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🎯 Real-World Use Cases

Pre-PR review

Run Jeff over a diff locally and fix what it finds before anyone else sees the branch.

Read-only CI gate

Add a review step that reports findings and cannot modify the tree.

Understanding an unfamiliar change

Ask for a semantic read of a diff in a codebase you do not know.

⚖️ Honest Review

✅ Pros

+Read-only by design
+CLI fits into existing workflows
+Uses typed decision models rather than a chat judge

⚠️ Cons

−Depends on the Jev model family
−Go binary rather than a language-native package

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CodeOct 20, 2026