Identify which question is being answered, using the user's prompt, the surrounding code, or by asking if the user is around:
- **"Does this logic / state model feel right?"** → [LOGIC.md](LOGIC.md). Build a single shareable HTML file (free-play buttons plus tabbed guided walkthroughs) that pushes the state machine through cases that are , and that a non-developer can drive.
- **"What should this look like?"** → [UI.md](UI.md). Generate several on a single route, switchable via a URL search param and a floating bottom bar.
The two branches produce very different artifacts, so . If the question is genuinely ambiguous and the user isn't reachable, default to whichever branch better matches the surrounding code (a backend module → logic; a page or component → UI) and state the assumption at the top of the prototype.
## Rules that apply to both
1. **, and clearly marked as such.** Locate the prototype code close to where it will actually be used (next to the module or page it's prototyping for) so context is obvious, but name it so a casual reader can see it's a prototype, not production. For throwaway UI routes, obey whatever routing convention the project already uses; don't invent a new top-level structure.
2. **.** A UI prototype starts from one command in the project's task runner: `pnpm <name>`, `python <path>`, `bun <path>`, etc. A logic demo is a single HTML file the user double-clicks. Either way, .
3. **No persistence by default.** State lives in memory. Persistence is the thing the prototype is _checking_, not something it should depend on. If the question explicitly involves a database, hit a scratch DB or a local file with a clear "PROTOTYPE, wipe me" name.
4. **Skip the polish.** No tests, no error handling beyond what makes the prototype _runnable_, no abstractions. The point is to learn something fast.
5. **.** After every action (logic) or on every variant switch (UI), print or render the full relevant state so the user can see what changed.
6. **Capture it when done.** Fold any validated decision into the real code, then capture the prototype itself as a ****: commit it to a throwaway branch, out of main, and leave a to that branch on the implementation issue. Capture the answer too (the verdict and the question it settled) in the issue or a commit. The main branch keeps only the validated decision.
Source metadata
---
name: prototype
description: Build a throwaway prototype to answer a design question. Use when the user wants to whether a state model or logic feels right, or explore what a UI should look like.
---
“capture the prototype itself as a primary source” — 不合并原型,也不销毁证据。 直接来源: 答案进入 issue / commit 和真实代码;原型提交到 main 之外的一次性分支,并从实现 issue 链接过去。 解读: 它解决了常见二选一:合并会留下低质量负担,删除又会丢失促成决定的可运行证据。旁支充当决策档案,而 main 只承载结论。