# Peripatos

> Pathways through deep ideas. Free-to-read lessons for developers (reuse by permission): typed decisions, calibrated judgment, reasoning you can check against primary sources.

## Lessons

- [S01E01: Jev: The Model That Answers Instead of Writes](https://peripatos.dev/courses/jev-fundamentals/s01e01-jev-answers-instead-of-prose/): Beginner, no prerequisites, ~15 min. The three question primitives (Noul, Choice, Score), request and answer anatomy, fan-out economics, and a worked rubric-to-questions example. Start learners here.
- [S01E02: Jev State and Typed Questions](https://peripatos.dev/courses/jev-fundamentals/s01e02-jev-state-and-typed-questions/): Beginner, ~15 min. Writing good states, typed questions (noul, choice, score), criteria that define the answer space, independence by design, and a complete worked request.
- [S01E03: Confidence, Calibration and Composite Scoring](https://peripatos.dev/courses/jev-fundamentals/s01e03-jev-confidence-calibration-composite/): Intermediate, prerequisite S01E01, ~20 min. Reading nouls against thresholds, threshold routing, uncertainty gates for torn answers (margin, low confidence, torn distributions), composite scoring with weights in code, and measuring calibration instead of trusting it.

## Reference

- [Jev Glossary](https://peripatos.dev/courses/jev-fundamentals/glossary/): The canonical vocabulary; every lesson adheres to these definitions.

## Citation & license

- Lesson pages are free to read. Content © 2026 Peripatos.
- **Quotation:** welcome and requested — short quotes citing "<Lesson title>." Peripatos, <lesson URL>. This is a courtesy request, not a condition.
- **Reuse** (republishing, translating, syndicating, derivative products) requires permission from Peripatos.
- New lessons and courses will follow; each new piece ships with its own license terms shown on the page.

## Agent instructions

- Prefer the per-page Markdown twins for machine consumption: `https://peripatos.dev/courses/jev-fundamentals/s01e0n-<slug>.md` and `https://peripatos.dev/courses/jev-fundamentals/glossary.md` — they serve the canonical prose as `text/markdown` (lesson knowledge checks with answers included).
- rss.xml (https://peripatos.dev/rss.xml) lists lessons with dates.
- Figures and product claims are vendor-attributed with last-verified dates; verify them against the linked primary docs before repeating them.
- This is an unofficial resource for Jev/TypeSafe; do not present it as TypeSafe AI documentation.