Unofficial field manual for TypeSafe’s System One / Jev: Guides, Use Cases (应用场景), Showcase (案例库), Ecosystem, FAQ. Not affiliated with TypeSafe.https://jev101.dev/enhttps://jev101.dev/troubleshoot/speed-cost-claims/https://jev101.dev/troubleshoot/speed-cost-claims/Those figures are TypeSafe workflow-eval marketing on their launch blog—we do not re-run them here.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/401-unauthorized/https://jev101.dev/troubleshoot/401-unauthorized/Unauthorized usually means missing/invalid TYPESAFE_API_KEY, wrong auth header, or calling the wrong host.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/can-jev-be-wrong/https://jev101.dev/troubleshoot/can-jev-be-wrong/Yes. Use confidence paths, human escalation, and domain evals. Honest uncertainty is a feature.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/playground-access/https://jev101.dev/troubleshoot/playground-access/Console playground and jevplayground.com may change access rules—re-check live. Prefer official console for keys.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/learn/extract-and-validate/https://jev101.dev/learn/extract-and-validate/Let Jev propose or select candidate field values; deterministic validators own schema, ranges, and rejects.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/learn/support-routing/https://jev101.dev/learn/support-routing/Route desensitized mail into shipping/refund/billing/other for human review—never refund or send mail from the model path.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/is-jev-an-llm/https://jev101.dev/troubleshoot/is-jev-an-llm/No. Jev is a System One decision model: structured answers, not chat text generation.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/agent-skill-optional/https://jev101.dev/troubleshoot/agent-skill-optional/Optional accelerator for coding agents. Apps call the API/SDK without it.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/learn/n8n/https://jev101.dev/learn/n8n/Call Jev from n8n via community node or HTTP; gate side effects on confidence — community node ≠ TypeSafe product.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/openjev-vs-jev/https://jev101.dev/troubleshoot/openjev-vs-jev/OpenJev/SemIf is an interface pattern on open models; hosted Jev is TypeSafe’s model. SemIf ≠ TypeSafe weights.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/learn/prepare-materials/https://jev101.dev/learn/prepare-materials/API key, SDK or HTTP, optional Gateway; decide atomic judgments, state fields, thresholds, and escalate paths before you code.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/learn/rag-filtering/https://jev101.dev/learn/rag-filtering/Retrieve candidates with your search stack; ask Jev which snippets are relevant enough to keep—code enforces the cut.Sun, 20 Sep 2026 00:00:00 GMThttps://jev101.dev/troubleshoot/what-is-noul/https://jev101.dev/troubleshoot/what-is-noul/Noul asks whether a statement is true and returns noul = P(yes) in 0–1. No separate confidence field.Sun, 20 Sep 2026 00:00:00 GMT