Check each claim against provided evidence text with TypeSafe Jev. Returns per claim: verdict (verified | contradicted | unsupported), full probability distribution, confidence, and whether the verdict stands on its own (auto) or needs human review. Pattern: docs.typesafe.ai/cookbooks/citation_check. Pass reports, PR descriptions, or agent briefs as claims and their cited sources, diffs, or documents as evidence.

Judge fetched or external text with TypeSafe Jev before an agent reads it: probability it contains instructions aimed at an AI agent (prompt injection), whether it has substantive content, and (when a purpose is given) whether it is relevant to the task. Returns a recommendation: pass | review | block | skip. Pattern: docs.typesafe.ai/cookbooks/llm_guardrails.

Rank candidates against a plain-language query with TypeSafe Jev — no embeddings needed. One Choice scores every candidate id by how well it answers the query, plus a Noul checks whether any candidate addresses the query at all (so a confident 'top hit' cannot masquerade as an answer). Pattern: docs.typesafe.ai/cookbooks/semantic_find. Use for 'which file/note/line covers X' across up to 250 candidates.

Assign each item to one class from a shared catalog with TypeSafe Jev, in one batched request: the class catalog is sent once and every item becomes an independent Choice question. Returns per item: the chosen class, the full distribution, confidence, winner-to-runner-up margin, and an auto-versus-review decision. Auto requires both a high top probability (default 0.85) and a clear margin (default 0.50); everything else is flagged for review. Include a manual_review class in the catalog if you want an explicit escape hatch; the tool never invents one.

One unresolved, bounded decision where semantic judgment over supplied evidence could change your plan: implementation alternatives, product tradeoffs with known preferences, workflow selection. Supply 2-6 candidates, evidence, and explicit priorities. Jev returns a Choice distribution over the candidates plus escape hatches (ask_user / investigate / none), and a per-candidate per-requirement supported / contradicted / unknown judgment for each optional requirement, all in one request. One call per unchanged decision; do not repeat a call to obtain a more pleasing answer. Use source inspection, tests, the user, or a reasoning model for open-ended research, routine choices, correctness proofs, or predicting user consent. High probability is not proof.

Rerank candidates against a query with TypeSafe Jev: one independent relevance probability per candidate, all in a single request, then sorted by score. Unlike jev_find (which picks one best answer), rerank scores every candidate so the full ordering survives. TypeSafe's rerank cookbook reports that on the CLERC benchmark this pattern lifted top-1 from 5% to 18% and top-10 from 38% to 62% (docs.typesafe.ai/cookbooks). Use for retrieval ordering, dedup triage, or feed ranking across up to 250 candidates.

Judge the relation between two passages with TypeSafe Jev: same_fact, contradicts, or different_facts, with the full probability distribution, confidence, and an auto-versus-review decision. Optionally supply aspects (price, date, method, …) and each gets an independent per-aspect judgment in the same single request. Use for source reconciliation, changelog-vs-code drift, or merge sanity checks. The request supplies no evidence beyond the two passages, so a same_fact verdict means they agree with each other, not that they are true.

Extract structured fields from a document with TypeSafe Jev as the picker, not the generator: your regex finds candidate substrings in code, Jev chooses which candidate is the field's true value, and the result is returned verbatim — never model-generated text. Fields with zero regex matches never reach the model (not_found); if no field has matches, no API call is made. Ambiguous picks are flagged for review. Use for prices, dates, version numbers, IDs, and anything with a recognizable shape; keep documents bounded.

Score a proposed diff against the request with TypeSafe Jev before the task is called done. Returns 0..2 rubric scores for correctness, spec match, test gap, and blast radius (the last two lower the weighted composite), a safe_to_apply probability, and an auto | review | escalate action. Auto requires safe_to_apply and min score confidence at auto_accept and the composite at composite_floor; truncated or malformed input never returns auto. Does not apply the patch or run tests. Use jev_gate to also verify completion claims against evidence in the same call.

Review a proposed patch and verify completion claims against supplied evidence in one TypeSafe Jev call. Auto only when the patch review is accepted and every claim is verified at or above auto_accept. Unsupported claims require review; confident contradictions, unknown confidence, or low confidence escalate. The request and claims are assertions to check, never proof; put supporting diff excerpts and test logs in evidence. Evidence is capped at 16 items and 200,000 characters in aggregate. Does not run tests or apply changes. Use jev_review for a patch without claims, jev_verify for claims without a patch review.