Course viewer

Render the enrolled course and its published lessons. The HTML page and its neighboring assets/ directory can be read locally; the course server saves exercises to JSON and reveals answers after submission. Math uses KaTeX. Cream editorial page: top bar with GNOS + tabs, hero with giant title + field metadata, curriculum list + topic details.

Use this skill when the learner asks to see the course or answers yes after the current lesson is ready. Re-render after a changed lesson or artifact before giving a page link. A learner who explicitly asks for only the outline may see its contents and sources through --outline-only. For an explicit context load at this step, use assemble_context.py --mode viewer --subject <subject> --learner <learner> --course-id <course-id>. Render only from the enrolled workspace at learners/<learner>/courses/<course-id>, never from a blueprint outputs/ file.

Complete the lesson handoff before showing teaching

Read the current topic and its published lesson. Course design supplies the outline; lesson-design supplies the teaching. If the current topic has no ready lesson, use that skill and its lesson design reference to author it before delivering a lesson page. If the learner reports a shallow lesson, set its publication back to draft, use the same reference to repair its explanation and examples, write a new design_receipt, and re-publish as ready — do not edit a ready file in place.

Do not write lesson content from course.json inside this viewer workflow. The renderer does not call a model or invoke skills: the host must perform the handoff, review the lesson, and publish it. A normal render requires a ready lesson for the current topic whose design_receipt.course_fingerprint equals the enrolled course.json fingerprint and whose design_receipt.review is pass. It fails otherwise with instructions to run lesson design first. Use --outline-only only for an explicitly requested outline or contents preview. If rendering fails, do not link an earlier portal/index.html or say the course is ready to view. The local server also checks the current lesson before starting and whenever it serves the page, so an old page cannot be used after the course moves on. The receipt checks a recorded handoff and course match. It cannot prove that the host read the skill or that the explanation is good; review the lesson.

Render

.venv/bin/python skills/course-viewer/scripts/render_viewer.py learners/alex/courses/motion

The script reads course.json, published lessons, and the artifact manifest, then writes portal/index.html and copies the bundled KaTeX, syntax-highlighting, and math-font assets to portal/assets/.

Open it locally:

.venv/bin/python skills/course-viewer/scripts/serve_course.py learners/alex/courses/motion --port 8080
# visit http://127.0.0.1:8080/portal/

Use this server for exercise interaction. A plain file or generic static server cannot write a learner response to the course workspace. Save answer persists an attempt under submissions/<exercise-id>/<attempt-id>.json; only a successful save enables Show answer. The solution is fetched on that explicit request and the reveal is recorded separately from the learner's response.

The layout

The design lives in references/example.html. Copy that look exactly:

• cream paper (#F6F4EE), near-black ink, teal links (#155E63), ochre labels (#8A6D3B), plum state/title (#5E2B4D), thin dividers
• topbar: GNOS logo left, tabs center (Overview, Lessons, Exercises, Sources, Artifacts with teal underline for active), All courses → right
• hero: giant condensed title + Rev, mono subtitle; right meta block with FIELD / LEVEL / RESOURCES behind a vertical divider
• overview is Curriculum (left) + Topic details (right): chapters as "Chapter 01 + Title", topics as numbered rows with Current (navy) / Planned (plum) + › chevron; selected row has textured grey fill; clicking a row updates Topic details (eyebrow, plum title, Subtopics / State / Formats / Evidence / Sources)
• lessons show their actual block formats as chips: manim, image, simulation, text (kept as chip manim hooks, hidden in curriculum rows, visible in Lessons). Older course plans still show their planned formats. A chip turns ready (chip manim ready) when its artifact is registered
• videos, images, and sandboxed simulations render full width inside rounded frames, captions below, never overlapping
• arrow keys step between lessons; lesson hooks (#tabs, #lesson-list, .lesson, #prev-link / #next-link) stay intact

Compatibility with other skills

The viewer renders whatever is registered in the course artifact manifest, whatever made it:

• manim-voice-animation videos -> watch, inline <video>
• host-generated images -> generated, inline <img>
• interactive simulations (HTML) -> sandboxed <iframe>
• pdf handouts and documents -> resources, open links

The lesson blocks show which forms were used. Older courses can still show their planned formats. The lesson coordinator registers every artifact with manage_artifact.py before rendering; only ready artifacts appear.

Rules

• Render only public fields in the initial page. Keep success criteria, tolerances, and private review notes private. The local server may return an authored solution only after a saved attempt and explicit Show answer.
• The page references learner media files in the workspace; it never copies or downloads them. Missing files get a visible note, never a crash.
• Re-render whenever the plan, a lesson, or the manifest changes.
• Math renders with bundled KaTeX, including local fonts. Lesson text must already delimit math as LaTeX ($...$, $$...$$); the renderer preserves delimited LaTeX and equation blocks exactly. Legacy undelimited ASCII text has a limited compatibility converter; never rely on it when authoring. Follow the lesson contract. Body prose is serif. Code blocks use semantic <pre><code> markup and the bundled highlighter; the code remains readable when highlighting cannot run.
• When reviewing a changed lesson, inspect rendered math in an explanation, an equation block, and an exercise prompt. Switch between Lessons and Exercises, then inspect a worked answer after an authorized save and reveal. Check the DOM for KaTeX output rather than only checking TeX strings in the HTML. A visible math-load warning means the page is not ready to deliver.
• If enroll or render fails, say plainly what failed and fix it that turn. Never silently skip the page.
• If the learner did not answer the show question, ask again on the next course turn.
• The page is for local viewing. Host it only for the enrolled learner.