jev verify

Check claims against evidence. Each claim gets a verdict, the full probability distribution, a confidence, and whether it can stand automatically or needs a person.

jev verify [claims...] --evidence <ref> [--evidence <ref>...] [options]

When to use

Fact-check a PR description against its diff, a report against its sources, or an AI summary against the document it summarizes. For quote-level citation checks, locate the passage in code first and send only that.

Options

Option	Meaning	Default
[claims...]	Claims as arguments
-c, --claims <ref>	Claims from a file or stdin: one per line, or a JSON array of strings
-e, --evidence <ref>	Evidence text, @file, or -. Repeat for several sources; files are labeled by filename.	required
--evidence-json <ref>	Evidence as JSON: ["text"], [{"id","text"}], or {"id": "text"}
--auto-accept <p>	Confidence at or above which a verdict is auto rather than review	0.8
--fail-on <list>	Exit 2 if any result is contradicted, unsupported, review, or unknown. none to always exit 0.	contradicted

Output

Field	Meaning
results[].verdict	verified, contradicted, unsupported (evidence is silent), or unknown
results[].confidence	0 to 1, how concentrated the distribution is
results[].action	auto or review
results[].probabilities	supports, contradicts, says_nothing
results[].supporting_evidence	The evidence id the claim rests on, when more than one source was given
summary	Counts of each verdict and of review

Example

jev verify --claims @claims.txt -e @spec.md -e @rfc.txt --fail-on contradicted,unsupported
git diff main | jev verify "This change only touches tests" --evidence -

#  Verdict       Conf  Action  Claim                             Source
-  ------------  ----  ------  --------------------------------  -------
1  contradicted  1.00  auto    Helmets are optional for adults   spec.md
2  verified      0.96  auto    Reflective gear is mentioned      rfc.txt
3  unsupported   0.71  review  The fine is 50 dollars            -

1 verified · 1 contradicted · 1 unsupported · 1 need review (auto-accept ≥ 0.8)

Tips

• One checkable statement per claim. Split compound sentences.
• unsupported often means the wrong source was supplied, not that the claim is false.
• Batch many claims against the same evidence with jev batch verify -i @claims.txt -- -e @spec.md.

Pattern: citation check cookbook.