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+---
+name: docs-page
+description: |
+  A documentation page — left nav, scrollable article body, right-rail
+  table of contents. Use when the brief mentions "docs", "documentation",
+  "guide", "API reference", or "tutorial".
+triggers:
+  - "docs"
+  - "documentation"
+  - "guide"
+  - "tutorial"
+  - "api reference"
+  - "文档"
+od:
+  mode: prototype
+  platform: desktop
+  scenario: engineering
+  preview:
+    type: html
+    entry: index.html
+  design_system:
+    requires: true
+    sections: [color, typography, layout, components]
+---
+
+# Docs Page Skill
+
+Produce a single, three-column documentation page in one HTML file.
+
+## Workflow
+
+1. **Read the active DESIGN.md** (injected above). Use the body type token for
+   prose; the mono token for code; respect line-height and max-width rules.
+2. **Pick a topic** from the brief — the page should look like real docs, not
+   a generic wireframe. Concrete API names, command examples, plausible
+   parameters.
+3. **Lay out** three regions:
+   - **Left nav** (240–280px, sticky): grouped link list, current page bolded
+     with a left-edge accent stripe. 3–5 groups of 4–8 links.
+   - **Article body** (max-width ~720px, centered in the middle column):
+     H1, lede paragraph, H2 sections, code blocks, callout boxes (note /
+     warning), inline links, lists.
+   - **Right TOC** (200–240px, sticky): "On this page" with the H2/H3
+     anchors, current section highlighted as the user scrolls.
+4. **Write** a single HTML document:
+   - `<!doctype html>` through `</html>`, all CSS inline.
+   - CSS Grid for the three columns; sticky positioning for the rails.
+   - Code blocks: monospace token, soft surface fill, copy-button affordance
+     (visual only — no JS needed).
+   - Anchor IDs on every H2/H3 so the TOC links work.
+   - `data-od-id` on the nav, article, and TOC.
+5. **Prose**: write at least 350 words of believable docs. Include at least
+   one shell command, one code snippet (5–15 lines), one callout, one table.
+6. **Self-check**:
+   - Body text wraps at the DS line-length sweet spot (60–75 chars).
+   - Code uses the DS mono token, not generic `monospace`.
+   - Accent is restrained — used for active nav item, links, one callout
+     border. Not on body text.
+   - Page is readable at 1280w and collapses gracefully below 900w (TOC drops
+     out, nav becomes a top drawer).
+
+## Output contract
+
+Emit between `<artifact>` tags:
+
+```
+<artifact identifier="docs-slug" type="text/html" title="Docs — Page Title">
+<!doctype html>
+<html>...</html>
+</artifact>
+```
+
+One sentence before the artifact, nothing after.