Design Prototype Skill | Agent Skills

Design Prototype

One HTML file, double-click to open, fully interactive, rendered by the actual design system (@lobehub/ui 5.x + antd 6 + antd-style tokens, exact versions from this repo's node_modules) — while the source stays production-style React (import { Block } from '@lobehub/ui', createStyles(({ css, token }) => …), hooks, memo). Promotion to production is mostly "split into files", not "rewrite".

Prototype code may be quick-and-dirty (one file, no i18n, inline data) — but the interaction must be complete: states, transitions, and affordances are the point of a prototype, not its code style.

How it works

one-time (~2s, cached):   scripts/build-runtime.sh  →  lobe-prototype-runtime.js (IIFE global)
                                                       + vendored babel.min.js
per prototype (no build): single HTML  =  <script runtime> + babel-standalone
                          + <script type="text/babel"> with production-style React

The runtime bundles react, react-dom/client, @lobehub/ui, @lobehub/ui/base-ui, antd (curated subset), antd-style, lucide-react from the repo's own node_modules — so tokens/components/versions match production, and react/emotion/ theme-context are singletons by construction.
A 3-line window.require shim + babel's transform-modules-commonjs lets the prototype keep real import statements.
ThemeProvider themeMode="auto" → light/dark follow the OS.

⚠️ Don't re-attempt the pure-CDN route (esm.sh import maps). It was tried and rejected: esm.sh's CJS named-export analysis fails serially across antd's dep chain (@ant-design/fast-color → @ant-design/colors → @rc-component/qrcode → …), and ?bundle leaks an unversioned react-is 404. Whack-a-mole, not a foundation.

Quickstart

Build the runtime into the prototype's directory (any dir works; /tmp is fine):
```
bash .agents/skills/design-prototype/scripts/build-runtime.sh /tmp/my-proto
```
Skip if lobe-prototype-runtime.js + babel.min.js are already there and the design-system versions haven't bumped.
Copy references/template.html into the same dir, rename, and replace the sample App with the real surface. Keep the runtime shim block untouched.
Open it (open /tmp/my-proto/xxx.html) — no server, no build.

Verify before delivering

Headless-check it renders with zero console errors (the repo's e2e Playwright works):

// node /tmp/check.mjs   — adjust paths
import { chromium } from '<repo>/e2e/node_modules/playwright/index.mjs';
const b = await chromium.launch();
const p = await b.newPage();
const errs = [];
p.on('pageerror', (e) => errs.push(String(e)));
await p.goto('file:///tmp/my-proto/xxx.html');
await p.waitForSelector('#root *', { timeout: 30000 });
await p.screenshot({ path: '/tmp/proto.png' }); // Read the screenshot yourself
console.log('errors:', errs);
await b.close();

Then Read the screenshot — a prototype is a visual deliverable; don't ship it sight-unseen. Check light + dark (emulate prefers-color-scheme) and a narrow viewport if the surface has a mobile story.

What's in the runtime (extend freely)

See assets/entry.mjs — the single source of truth. Currently:

@lobehub/ui: ActionIcon, Alert, Avatar, Block, Button, Center, Collapse, DraggablePanel, Drawer, DropdownMenu, Empty, Flexbox, Highlighter, Hotkey, Icon, Image, Input, InputNumber, Markdown, Modal, NeuralNetworkLoading, Popover, ScrollShadow, SearchBar, Segmented, Select, Skeleton, SortableList, Tabs, Tag, Text, TextArea, ThemeProvider, Tooltip
@lobehub/ui/base-ui: full namespace (Select, Modal, DropdownMenu, Switch, Toast, FloatingSheet, …)
antd: App, Badge, Checkbox, Divider, Dropdown, Progress, Radio, Slider, Space, Steps, Table
antd-style, lucide-react, react, react-dom/client: full namespaces

Missing a component → add to entry.mjs, rerun the build script (~2s). Sizes: curated ≈ 16MB (fine from disk); a full export * from '@lobehub/ui' works too (≈ 27MB) if you'd rather never curate.

Pitfalls

Switch lives in @lobehub/ui/base-ui, not the root package (as do the other base-ui primitives). Importing it from the root fails the runtime build.
Use createStyles (runtime), not createStaticStyles — static extraction needs a build step. This is the one sanctioned deviation from production style; note it when handing the prototype to an implementer.
babel must stay the raw UMD file (unpkg/jsdelivr). esm.sh rewrites it to ESM and a classic <script src> chokes on export.
The require shim throws with the module name when an import isn't in the runtime — that's the "add to entry.mjs and rebuild" signal, not a template bug.
Text type accepts only secondary|success|warning|danger|info; Tag color has no primary (DESIGN.md "Applying tokens in components").

Design bar (same as production surfaces)

A prototype is a surface — the ux checklists apply to what it demonstrates:

Show at least one non-happy-path state (empty / loading / error / in-progress), ideally behind a state-toggle strip like the template's. A happy-path-only prototype under-specifies the design and silently blesses missing states.
Reuse the app's surface contracts: side panels are DraggablePanel (collapse + drag-resize come free), loading is skeleton/NeuralNetworkLoading (never antd Spin), modals via createModal-style flows.
Don't paint affordances you don't wire (cursor: zoom-in with no zoom, keycap chips with no keys) — in an interactive prototype a dead affordance is a spec bug.
Walk the ux Quick review against the prototype before delivering; annotate anything deliberately out of scope in an HTML comment so the implementer knows it's a cut, not a decision.

Agent Skills: Design Prototype

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