Jev versus code analyzers: a practical comparison
Code analyzers (linters, typecheckers, SAST, Semgrep) prove or pattern-match on an AST. Jev can help an agent pick a skill or decide “does this diff look like a secrets leak in prose?” It will not compile your repo.
Unofficial. TypeSafe’s agent skill teaches coding agents to batch System One questions. That does not replace tsc or CodeQL. docs.typesafe.ai.
Comparison scope
Use analyzers for definite defects. Use Jev for review routing, “needs human,” or catalog skill suggestion (their cookbook) — not for numeric complexity scores.
Criteria that decide the architecture
| Axis | Jev (System One) | Code analyzers |
|---|---|---|
| Type errors | No | Wins |
| Secret regex | Second layer at best | Wins |
| Reviewer load | Choice/Score on the PR text | Not their job |
| Assembly / hex | Jaggedness: semantic > numeric encodings | Specialized tools |
Decision quality and control
Official jaggedness: high-level language questions beat assembly/binary. Do not send minified bundles as state and expect a security verdict.
Integration trade-offs
CI: analyzers block merge on definite issues. Optional Jev on the PR description + selected hunks for “needs security review.” Pin the model. Keep diffs small.
TypeSafe’s public models page lists jev-1.13 at $0.042 per million input tokens with output tokens free — a vendor claim, not a jev.pro measurement. Confirm on the models page before you bid.
When each approach fits
Prefer Jev when
- You need a snap judgment on review comments or routing
Prefer Code analyzers when
- The question has a formal answer in the AST
Analyzers first; Jev routes leftover judgment; humans merge.
What this page does not claim
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Not a SAST vendor chart.
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Schema-safe output is not the same as factual correctness.
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No independent bake-off numbers live here.
FAQ
Can Jev write the fix? No generation. The coding agent writes; Jev may gate.
Skill suggestion cookbook? Official: rank skills, Noul whether any is needed. Still not a linter.
Disclaimer
This is an independent unofficial site and is not affiliated with TypeSafe AI; official documentation is available at https://docs.typesafe.ai. Never treat jev.pro as TypeSafe official documentation. We do not sell, issue, or proxy API keys.
Hub: Comparisons. Siblings: vs security automation, agent skill, questions for builders. Canonical: https://docs.typesafe.ai.
Sources
Public TypeSafe or adjacent documentation only. No private claims.