prototype

prototype is a skill for Codex from OutlineDriven/odin-claude-plugin. It costs 36 tokens per session (3,100 once invoked), scanned A, original, Apache-2.0.

A throwaway experiment for answering one design question about an interface, program logic, or data shape. It lets a person test the idea by interacting with buttons and observing the result.

In plain words
What is it for?
Use it to test a proposed screen flow, state model, logic rule, or data structure, then record the decision and optionally carry it into the real code.
Why use it?
It helps resolve uncertainty before building the full product. The experiment stays separate from production work so the decision can be checked and discarded safely.

Skill for Codex

Written for Codex: agents/openai.yaml present.

Part of the odin-design plugin — 21 skills shipped together

Good fit Use it to test a proposed screen flow, state model, logic rule, or data structure, then record the decision and optionally carry it into the real code.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/outlinedriven/odin-claude-plugin/prototype
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add OutlineDriven/odin-claude-plugin --skill prototype
Clone the repo
git clone --depth 1 https://github.com/OutlineDriven/odin-claude-plugin

Made for: Codex.

Or install odin-design, the plugin that ships this one along with the rest of its 21 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for prototype

README.md
[![agentmods](https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/prototype.svg)](https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/prototype)
Your own site
<a href="https://agentmods.dev/skills/outlinedriven/odin-claude-plugin/prototype"><img src="https://agentmods.dev/badge/skills/outlinedriven/odin-claude-plugin/prototype.svg" alt="Measured on agentmods" height="20"></a>
Per session 36 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,100 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00036 $0.03100
Opus 5 $0.00018 $0.01550
Sonnet 5 $0.00007 $0.00620
Haiku 4.5 $0.00004 $0.00310

Measured yesterday against content hash a21fbd2a2213, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

prototype scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/odin-design/skills/prototype/SKILL.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Prototype

Contract

Field Bound contract
Trigger Explicit model invocation: one design question needs a cheap logic or UI experiment, including a state-model, logic, or data-shape question a human checks by pressing buttons and watching state change, even when the driver is a non-developer.
Authority Reversible local: writes throwaway prototype artifacts and their verdict on a throwaway branch off main; may fold the validated decision into the named real-code target as a working-tree edit the user commits through their normal flow; rollback is abandoning the throwaway branch or restoring its commits. Never push, delete existing work, or change production rendering. No remote mutation.
Side effect Write one throwaway prototype artifact and its verdict off the main branch; that branch is the evidence, not a delivery target.
Done The question is answered in one line and the decision is folded into the real work.

Inputs

  • Question (required): the design question being answered, drawn from the user's prompt or surrounding code. If the question is genuinely ambiguous and the user is reachable, ask before routing.
  • Context (required): the surrounding code or page that frames the question. Determines whether to route to LOGIC or UI.
  • LOGIC mode also takes: the relevant state, actions, domain terms, and legal-transition rules; a path for the throwaway HTML file; representative scenarios or enough domain rules to derive a happy path, a tricky edge case, and an illegal-action attempt; the main branch the throwaway branch is based on; and a real-code target, required only after the human validates the module.

Procedure

Route

Route before writing because LOGIC and UI variants require different artifact structures.

  1. Classify the question:
    • Logic: state machine, edge case, data shape, reducer, API contract, or "does this feel right" → use the LOGIC procedure below.
    • UI: what something should look like, layout, information hierarchy, or "what should this look like" → use the UI procedure below.
  2. If ambiguous and the user is not reachable, default: backend module → LOGIC; page or component → UI. State the assumption at the top of the artifact. Done when: the question is classified as LOGIC or UI, or the ambiguity default is stated and recorded on the artifact.

Read the full file on GitHub · 110 lines

Files

What ships with it

1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 110 lines · 36 tokens per session scan A a21fbd2a2213

Subscribe to this mod's changes

prototype is a skill published in the GitHub repository OutlineDriven/odin-claude-plugin (35 stars, last pushed today), licensed Apache-2.0. It adds 36 tokens to every session and 3,100 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-06.

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