JJEV Field Guide
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Jev learning resources: three independent sites mapped

Use Playground for real runs, Manual for downloadable programs, and Learn Jev for patterns and reliability. Each entry links to the original and to a matching primer here.

This is an independently written index and guide, not a copy of the original tutorials or code. Features may change. Checked 2026-09-23.

014 presets · 6 scenario links

Jev Playground

The site says it offers real Jev runs without visitor signup, four ready-made question examples, and six linked scenario demos. Its free usage is limited. Its Boolean UI maps to an integration surface; TypeSafe's direct API calls this primitive Noul.

Best for

Best for observing how real output changes with input.

Keep in mind

This site does not mirror its model service; check the source for limits and results.

Open source site ↗
025 stages · 8 projects

Jev Manual

Its five-stage route covers concepts, a first call, confidence controls, shipping, and real projects. The project catalog lists eight Python tutorials with downloadable programs, no-network fixtures, and a key-based live mode.

Best for

Useful when you know some Python and want a complete runnable workflow.

Keep in mind

Fixtures explain the contract rather than report measured Jev output; live mode needs your own key.

Open source site ↗
0313 tutorials

Learn Jev

Thirteen tutorials are grouped into three foundations, seven patterns, and three reliability topics, spanning first calls, state, fan-out, gating, cascades, failure modes, benchmarks, and production.

Best for

Useful after the basics for workflow design and reliability.

Keep in mind

Some interpretations and performance figures are author analysis or vendor data; inspect the cited source.

Open source site ↗

START HERE

Suggested beginner order

  1. Read this site's eight-step course to learn state and question types.
  2. Run one Playground preset and change one fact at a time.
  3. Try Manual's support project in no-network fixture mode.
  4. Use Learn Jev's reliability topics to plan examples, thresholds, and fallback.

Topic directory

Live practice and scenarios

11
  1. 01Run and vary an exampleOpen source site ↗Matching lesson here
  2. 02Support routing presetOpen source site ↗Matching lesson here
  3. 03Refund verification presetOpen source site ↗Matching lesson here
  4. 04Incident urgency presetOpen source site ↗Matching lesson here
  5. 05Agent next-action presetOpen source site ↗Matching lesson here
  6. 06Browser decision demoOpen source site ↗Matching lesson here
  7. 07Citation verificationOpen source site ↗Matching lesson here
  8. 08Email triageOpen source site ↗Matching lesson here
  9. 09Model routingOpen source site ↗Matching lesson here
  10. 10Smart home simulationOpen source site ↗Matching lesson here
  11. 11Semantic ad hidingOpen source site ↗Matching lesson here

Runnable projects

08
  1. 01Support ticket routerOpen source site ↗Matching lesson here
  2. 02AI model routerOpen source site ↗Matching lesson here
  3. 03RAG passage filteringOpen source site ↗Matching lesson here
  4. 04AI citation checkingOpen source site ↗Matching lesson here
  5. 05Structured data extractionOpen source site ↗Matching lesson here
  6. 06Agent tool risk gateOpen source site ↗Matching lesson here
  7. 07LLM guardrailsOpen source site ↗Matching lesson here
  8. 08Date expression extractionOpen source site ↗Matching lesson here

Systematic tutorials

13
  1. 01First API callOpen source site ↗Matching lesson here
  2. 02Three primitivesOpen source site ↗Matching lesson here
  3. 03Writing stateOpen source site ↗Matching lesson here
  4. 04Speculative fan-outOpen source site ↗Matching lesson here
  5. 05Confidence gatingOpen source site ↗Matching lesson here
  6. 06Composite scoringOpen source site ↗Matching lesson here
  7. 07Features, not answersOpen source site ↗Matching lesson here
  8. 08Cascade routingOpen source site ↗Matching lesson here
  9. 09Agent harnessOpen source site ↗Matching lesson here
  10. 10Real-time loopsOpen source site ↗Matching lesson here
  11. 11Failure modesOpen source site ↗Matching lesson here
  12. 12Cost and benchmarksOpen source site ↗Matching lesson here
  13. 13Production checklistOpen source site ↗Matching lesson here
Sources
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