design-lesson

name	design-lesson
description	Deep-dive interview to design a single lesson within a claude-teacher course. Produces the lesson.md body, rubric.md, hints.md (with a graduated hint ladder), and examples.md. Use after /design-course and /design-module, when the author is ready to flesh out a specific lesson.

design-lesson

This is where most courses die. Authors rush into lesson writing with vague objectives and end up with "explain X" lessons that are indistinguishable from blog posts. Do not let that happen here.

Arguments

• $1 — course id
• $2 — lesson id (must already exist as an entry in the course's modules[*].lesson_ids — if it doesn't, refuse and point at /design-module).

Steps

1. Load context. Read authoring/outputs/$1/course.yaml and find the lesson entry with id $2. If not found, refuse. Read the module it belongs to so you understand its thematic neighbours.

2. Run the deep interview. One question at a time. No batching.

   1. "In one sentence, what is the objective of this lesson? Start with a verb the learner will perform."
   2. "What is the ONE thing this lesson teaches? If you list more than one, split it into two lessons."
   3. "What is the concrete artifact the learner produces? Give me a file path. If there is no artifact, this is a reading lesson — confirm."
   4. "What are the completion criteria? Each one must be checkable by reading a file or running a command."
   5. "Where do learners get stuck? List the top 3 confusions you expect. These become the hint ladder."
   6. "For each confusion, what is the smallest nudge that would unstick them? That is hint level 1. What is the explicit explanation? That is hint level 3. What is the near-solution? That is hint level 4. We do not write a level 5 unless the lesson is exceptionally hard."
   7. "What would a bad submission look like? Give me 2-3 concrete failure modes."
   8. "What should the learner NOT do in this lesson, even though it seems related?"

3. Draft the four files. Into authoring/outputs/$1/lessons/$2/:

   • lesson.md — start from authoring/templates/lesson.template.md, fill in frontmatter from the interview answers (id, module_id, title, type, duration_min, prereqs, submission_path), then Objective, Why this matters, What you will do, Completion criteria, Submission, What you will NOT do yet. Keep it under 150 lines.

   • rubric.md — start from authoring/templates/rubric.template.md. Each rubric item must have a pass_signal and fail_signal that a teacher can check by reading the artifact. No "looks good to me" rubrics. Include the self-reliance signals section.

   • hints.md — 3-5 graduated hint levels from the interview answers. Level 1 nudge, level 2 pointer, level 3 partial explanation, level 4 near-solution. Mark each level with ### Hint level N so /give-hint can parse them.

   • examples.md — sample artifacts or pitfall gallery. If the file contains a full reference implementation, add a safe-to-show: false marker at the top so /give-hint and /lesson-start know not to paste it.

4. Cross-check. Read the three files you just wrote and verify:

   • Every completion criterion maps to at least one rubric item.
   • Every rubric item has a pass/fail signal.
   • Every hint level matches a confusion from the interview.
   • Lesson duration_min is consistent with the work described. If any check fails, fix it before returning.

5. Hand off. Tell the author: "Lesson $2 drafted. Run /design-lesson $1 <next-lesson-id> to continue, or /compile-course-pack $1 when all lessons are done."

Output contract

• Four files under authoring/outputs/$1/lessons/$2/ filled in.
• Cross-check passed.
• No content copied verbatim from the course.yaml — each file stands on its own.

Refusals

• Do NOT write the lesson based on assumptions. If the author skipped a question, ask it again.
• Do NOT write a lesson with more than one teaching objective. Split instead.
• Do NOT invent rubric items. Every rubric item must trace to an interview answer about completion criteria.
• Do NOT write a reference solution in examples.md without the safe-to-show: false marker.