Build throwaway prototypes (interactive single-file HTML or quick logic sketches) to answer design, logic, or UI questions before committing. Use when exploring state models, testing UI layouts, or sanity-checking ideas.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Prototype
A prototype is **throwaway code that answers a question**. The question decides the shape.
## Pick a branch
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 hard to reason about on paper, and that a non-developer can drive.
- **"What should this look like?"** → [UI.md](UI.md). Generate several radically different UI variations on a single route, switchable via a URL search param and a floating bottom bar.
The two branches produce very different artifacts, so getting this wrong wastes the whole prototype. 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
…
The line at the top of this page pins the label git:20261016.0f9b29d, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
GET https://markdownregistry.com/api/v1/artifacts/art_hyfyrt6gx4lq6p2i
GET https://markdownregistry.com/api/v1/resolve?ref=saifallah-star/aegis/prototype
GET https://markdownregistry.com/api/v1/blob/bba7a428fe83a5567547e9dd6fa189deaeb4c65a1c25762ee9d41d819f40cf04
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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mxyhi/ok-skills · prototype/SKILL.md · Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model…
tobihagemann/turbo · claude/skills/prototype/SKILL.md · Build a self-contained local prototype at .turbo/prototypes/<slug>.html, drive it, and hand it to the user to settle…
tobihagemann/turbo · codex/skills/prototype/SKILL.md · Build a self-contained local prototype at .turbo/prototypes/<slug>.html, drive it, and hand it to the user to settle…
asymmetric-al/core · .agents/skills/prototype/SKILL.md · Build a throwaway prototype to answer a design question. Use when the user wants to sanity-check whether a state model…
