140 lines
4.7 KiB
Markdown
140 lines
4.7 KiB
Markdown
# Onboarding — generate your skin from a website
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**Goal:** point the skill at a site you like (your own, a competitor, a reference), and have it extract the palette + typography, then rewrite `style-guide.md` so every future diagram inherits that skin.
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Takes about 60 seconds.
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---
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## The flow
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```
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URL you provide
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↓
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[1] fetch homepage (headless browser or HTTP)
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↓
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[2] extract dominant colors + fonts
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↓
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[3] map to semantic roles (paper, ink, muted, accent, …)
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↓
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[4] propose a style-guide.md diff
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↓
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[5] write the diff (with your approval)
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↓
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future diagrams use your tokens
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```
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---
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## Invocation
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Ask the skill:
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> *"Onboard diagram-design to my site — `https://example.com`"*
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Or run it with an explicit URL and the skill reads this file and executes the steps below.
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---
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## Step 1 — fetch the page
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Use `agent-browser` (preferred) or a plain `fetch`. If the site has multiple pages worth sampling (landing + blog + product), fetch 2–3 and merge the palette signals.
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```bash
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agent-browser navigate https://example.com --screenshot out.png --html out.html
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```
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---
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## Step 2 — extract colors and fonts
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### Colors
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Parse the rendered CSS and screenshot:
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- **Background color** of `<body>` or the dominant large region → `paper`
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- **Primary text color** (body text) → `ink`
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- **Secondary text color** (captions, meta) → `muted`
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- **Most-used brand color** (CTA button, link, heading accent) → `accent`
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- **Container / card background** slightly darker than paper → `paper-2`
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- **Border / hairline color** → `rule` (convert to rgba of ink at ~0.12 opacity)
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Prefer CSS custom properties when the site exposes them (`:root { --accent: …; }`). Otherwise pull via rendered `getComputedStyle` samples or a color-histogram pass over the screenshot.
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### Fonts
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Read the rendered `font-family` stack of:
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- `<h1>` → `title` family
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- `<body>` → `node-name` family
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- `<code>`, `<pre>`, or any mono-styled element → `sublabel` family
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If the site has only one family, keep the diagram-design defaults for the missing roles (Instrument Serif for title, Geist Mono for mono). Don't force-pick a mono font that isn't on the site.
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---
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## Step 3 — map to semantic roles
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Propose a diff by filling this table:
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| Role | Detected | Confidence |
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|---|---|---|
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| paper | `#f8f6f0` | high |
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| ink | `#111111` | high |
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| muted | `#6b6b68` | medium |
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| accent | `#c73a2b` | high |
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| … | … | … |
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Flag low-confidence guesses so the user can correct before applying.
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### Constraint checks
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Before writing, validate:
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- **AA contrast**: `ink` on `paper` ≥ 4.5:1. `muted` on `paper` ≥ 4.5:1 for body text.
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- **Accent is the most saturated color**: not muted-ish, not near-grey.
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- **paper ≠ pure white**: if the site uses `#ffffff`, fall back to `#fafaf7` to preserve diagram-design's warm-neutral feel — or ask the user to confirm pure-white is intentional.
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If any check fails, propose an adjusted value and explain why.
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---
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## Step 4 — preview the diff
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Show the user what will change in `style-guide.md`. Only the tokens table — everything else stays the same.
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```diff
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-| `paper` | `#f5f4ed` | `#1c1a17` |
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-| `ink` | `#0b0d0b` | `#f1efe7` |
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-| `accent` | `#f7591f` | `#ff6a30` |
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+| `paper` | `#f8f6f0` | `#1a1815` |
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+| `ink` | `#111111` | `#efeee7` |
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+| `accent` | `#c73a2b` | `#e05440` |
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```
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Also regenerate the dark variant via the inversion rule (`rgba(11,13,11, X)` → `rgba(ink-rgb, X)`).
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---
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## Step 5 — apply
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Write the new tokens to `style-guide.md`. Suggest running the `/regenerate-examples` flow (if it exists) or rebuilding one example to verify the new skin reads cleanly.
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After onboarding, the user should:
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1. Open `assets/index.html` (gallery) and confirm the new palette feels coherent across all 13 types.
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2. If any type looks off, they usually need to tune `muted` (often too dark or too light against the new `paper`).
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---
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## When onboarding fails
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- **Site uses webfonts you can't replicate** (custom-hosted, paid): keep the diagram-design defaults for typography and skin only the colors.
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- **Brand has 6+ colors** and you can't identify a clear hierarchy: pick one as `accent`, demote the rest to `muted` variants or ignore them. The diagram grammar only uses 5–7 roles.
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- **Site is dark-mode first**: flip the inversion — treat their dark paper as the default `paper`, and generate a light variant via inversion.
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- **Homepage is all imagery, no text**: ask for a blog or docs URL instead — text-heavy pages expose the type hierarchy.
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---
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## Future: per-project skins
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If the user wants multiple skins (one per project), duplicate `style-guide.md` as `style-guides/<project>.md` and add a header comment pointing the build to the active one. That's a v1.1 feature — for now, one skin per skill install.
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