Developer Tools

schemafit

Last updated 2026-06-30 · benchmark checked 2026-08-09 · unchanged since 2026-08-03 — deterministic & reproducible

CLI tool that lints LLM JSON schemas against provider constraints before they fail in production.

Is schemafit production-ready?

Legit.Show scores schemafit 83 out of 100 — the simple average of its 6 measured frames. Legit.Show ran its deterministic 7-Frame production-readiness benchmark on schemafit (public-surface assessment), measured from the public surface with no LLM in the scoring path. Its strongest frame is Privacy; its weakest is Security. 6 of the seven frames returned a score; Accessibility was not measurable on this service and is recorded as null — not as zero. Every frame it averages is published with its evidence on the Legit.Show listing.

The 7 Frames

• Performance — 80/100
• Accessibility — not measurable on this service (null — not scored as 0)
• Security — 45/100
• Privacy — 100/100
• Reliability — 75/100
• Standards — 100/100
• Discoverability — 100/100

What we measured

• Security headers present: HSTS.
• No Content-Security-Policy.
• Served over HTTPS with a valid certificate.
• Real Lighthouse performance run — 206 ms to first byte.
• 1 of 1 sampled routes reachable.
• Has a reachable privacy policy.
• Sets cookies / loads scripts with no consent prompt.
• Discoverable: structured data, sitemap, OpenGraph image, canonical URL.

Who built it

Dan Mercede (@danmercede)

Who it's for

ML engineers · LLM developers · DevOps/CI teams · Backend engineers · Schema maintainers

Pricing

Open source (MIT)

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