---

name: walkthrough description: Use when turning a repo, pull request, plan/design doc, architecture, article, blog post, book, lecture, or transcript into an interactive learning artifact — a self-contained offline walkthrough.html and/or a deployable learning hub. Triggers include "onboarding guide", "walk me through this PR/codebase/design", "interactive explainer", "teaching site", "publish docs to GitHub Pages".

Walkthrough

Turn any source into a deployable learning site: self-contained, offline walkthrough.html "routes" organized by a React/Vite hub (the document center) that also renders plan.md / design.md. You author content for a target audience; a build script renders polished, consistent HTML; CI publishes to GitHub Pages.

Core principle: you author Markdown DSL, not HTML. The build script owns syntax highlighting, diagram rendering, the TOC, quizzes, and progress — so every route is consistent and offline-capable. Hand-writing HTML (or hand-drawing SVG, or hand-tokenizing code) is the anti-pattern this skill exists to prevent.

Audience principle (hard rule): everything that renders in the browser is for the learner and no one else — never the author, a reviewer, or an agent. Never render authoring meta-commentary ("an older draft said…", "myth correction", "verified against source", "don't teach the old version", "TODO"). State the correct thing plainly as settled fact; keep any correction-of-the-source in your reply to the user, not on the page. The build runs an audience linter that flags these; treat hits as defects. See references/pedagogy.md → The learner is the only reader.

Theme: every generated page (routes and hub) ships both a light and a dark palette baked in — default light, with a persisted toggle (no flash on load, no runtime fetch). Code highlighting uses Shiki dual themes (CSS-variable mode), so light/dark switch offline.

First decide: standalone file or hub site? (ask before building)

These are two different deliverables. Always confirm which one the user wants before authoring — do not assume the full site. Ask plainly, e.g. "Do you want a single standalone walkthrough.html you can open/email offline, or a full deployable learning hub site (multiple walkthroughs + plans, published to Pages)?"

• Standalone route (one-off). A single shareable/offline walkthrough.html. Do steps 1–3 only — author DSL, run build-walkthrough.mjs --out <anywhere>.html, hand over the file. Skip the hub, config, and deploy. Fully self-contained.
• Hub site (collection). A deployed document center organizing many walkthroughs + plans. Do all five steps and deploy the hub.

If the user is ambiguous or names only one source, default to asking rather than building the whole site.

When to use

• Onboarding someone into a repo or set of repos
• Walking through a PR/MR, a plan, or an architecture/design for review
• Turning an article, blog post, book, lecture, or transcript into an interactive explainer
• Any content that benefits from an interactive, taught, shareable rendering

When not to use: live Socratic tutoring with mastery gating → use the teach skill. A one-paragraph answer → just answer.

Architecture (hub over routes)

• Routes = self-contained walkthrough.html files. Inline CSS, pre-rendered SVG diagrams, pre-highlighted code, tiny JS. Open by double-click, emailable, work offline.
• Hub = a React/Vite app that indexes/links routes and renders plans. The front door.
• Everything is vendored into the target repo's .walkthrough/ and committed; CI builds and publishes to Pages.

Pipeline

digraph wt {
  rankdir=TB; node [shape=box];
  analyze [label="1. ANALYZE\nIngest source via its recipe\n(repo / PR / plan / URL / transcript)"];
  author  [label="2. AUTHOR (for the audience)\nWrite Markdown DSL: sections, examples,\n:::reveal, :::quiz, :::callout, mermaid"];
  render  [label="3. RENDER\nbuild-walkthrough.mjs -> self-contained\ncontent/routes/<slug>.html"];
  manifest[label="4. REGISTER\nadd route/plan to walkthrough.config.json"];
  deploy  [label="5. DEPLOY\nbuild-hub.mjs locally to preview;\ncommit; CI publishes to Pages"];
  analyze -> author -> render -> manifest -> deploy;
}

0. Decide the deliverable — confirm standalone file vs hub site (see above) plus the audience and goal. Don't build the hub unless the user wants the collection.
1. Analyze — read the source using the matching recipe in references/source-recipes.md.
2. Author — write a Markdown DSL source per references/dsl-syntax.md, structured with the non-gating pedagogy in references/pedagogy.md. Order prerequisites first; use :::reveal for try-then-show and :::quiz for non-gating self-checks.
3. Render — node scripts/build-walkthrough.mjs <src>.md --out .walkthrough/content/routes/<slug>.html.
4. Register — add the route (and any rendered plans) to walkthrough.config.json.
5. Deploy — first time: bash scripts/setup-deploy.sh --repo <target> --base /repo/. To preview locally, build the hub with --base / (not /repo/) and serve it over HTTP without single-page mode (cd .walkthrough/dist && npx serve -l 3000 .) — see the preview footguns in references/deployment.md. Then tell the user to commit and enable Pages (Settings → Pages → Source = "GitHub Actions", or the first run fails at Configure Pages and the site keeps serving the repo README). Deploys fire only on pushes to the default branch. See references/deployment.md.

Setup note

The build scripts have npm dependencies. First use: npm install in scripts/. Installing the optional @mermaid-js/mermaid-cli enables light pre-rendered SVG diagrams; without it diagrams still render offline via an inlined runtime (larger files).

Quick reference

Need	Do
Author content	Markdown DSL (references/dsl-syntax.md) — never raw HTML
Highlight code	fenced ```lang — Shiki, automatic
Diagram	```mermaid — pre-rendered SVG (or offline runtime)
Self-check (non-gating)	:::quiz with - ( ) / - (x) + > explanation
Try-then-reveal	:::reveal <prompt>
Custom UI	:::html (self-contained only)
Render a route	node scripts/build-walkthrough.mjs src.md --out …/routes/slug.html
Customize code themes	--light-theme <name> --dark-theme <name> (Shiki themes; default github-light/night-owl)
Build hub for deploy	node scripts/build-hub.mjs --root …/.walkthrough --base /repo/
Preview hub locally	build with --base /, then cd …/.walkthrough/dist && npx serve -l 3000 . (no -s)
Scaffold a repo	bash scripts/setup-deploy.sh --repo <repo> --base /repo/

Common mistakes

• Hand-writing HTML / SVG / highlighted code. The build script does this consistently and offline. Authoring raw HTML drifts in quality and breaks the offline guarantee. Use the DSL; reserve :::html for genuinely custom widgets.
• Gating quizzes. All checks are non-gating and retryable. Never hide content behind a correct answer. (For gated mastery learning, that's the teach skill, not this one.)
• CDN <script>/<link> tags. Anything fetched at runtime breaks offline/emailable.
• Forgetting to register the route in walkthrough.config.json — the hub won't show it.
• Summarizing instead of teaching. Produce a learning artifact (explain → example → check → synthesis), not a recap.
• Addressing anyone but the learner. No meta-commentary, no notes-to-the-author, no "an earlier version got this wrong." The learner is the only reader; the audience linter flags the common tells. See references/pedagogy.md.

References

• references/dsl-syntax.md — the authoring DSL (frontmatter, code, mermaid, containers)
• references/source-recipes.md — per-source ingestion + shaping
• references/pedagogy.md — non-gating, audience-aware, Bloom-informed authoring
• references/deployment.md — .walkthrough/ layout, config, setup, CI, GitLab-later
• The repo's teach skill — pedagogy evidence base (gated tutoring; complementary, not this)