What is concept-prototyper?

A planning and wireframing guide for shaping a website idea before visual design or production coding. A wireframe is a rough layout used to discuss structure and content.

Creating a site concept, mapping pages and user journeys, making disposable HTML wireframes, organizing feedback, and routing unresolved conflicts for review.

It exposes unclear goals, missing content, and conflicts between business needs and user feedback while changes are still inexpensive.

concept-prototyper — Skill for Codex by sergekostenchuk

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 sergekostenchuk/ui-ux-agent-skill-system --skill concept-prototyper

Clone the repo

git clone --depth 1 https://github.com/sergekostenchuk/ui-ux-agent-skill-system

Made for: Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/concept-prototyper/github.svg)](https://agentmods.dev/skills/sergekostenchuk/ui-ux-agent-skill-system/concept-prototyper)

Your own site

<a href="https://agentmods.dev/skills/sergekostenchuk/ui-ux-agent-skill-system/concept-prototyper"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/concept-prototyper/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/sergekostenchuk/ui-ux-agent-skill-system/concept-prototyper"><img src="https://agentmods.dev/badge/skills/sergekostenchuk/ui-ux-agent-skill-system/concept-prototyper.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 63 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 458 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.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00063	$0.00458
Opus 5	$0.00032	$0.00229
Sonnet 5	$0.00013	$0.00092
Haiku 4.5	$0.00006	$0.00046

Measured 11d ago against content hash d87c0c036ca0, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

concept-prototyper 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 11d ago.

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.

core/skills/concept-prototyper/SKILL.md · 48 lines

What it actually says

Concept Prototyper

This skill creates the concept bridge between SEO/semantic structure and UI design. Its prototype is a feedback artifact, not production code.

Operating Modes

concept: create docs/site-concept.md from semantic core and business logic.
wireframe: create a throwaway HTML/wireframe prototype for feedback.
feedback: structure user feedback into reports/business-concept-feedback.json.
conflict: produce reports/concept-conflicts.md and route unresolved conflicts to council.

Required Workflow

Read references/concept-prototype-contract.md.
Load semantic core, project brief, known business facts, and existing content if available.
Build a content hierarchy: primary journey, page map, required facts, trust signals, CTA logic.
If prototyping, create a clearly non-production wireframe artifact with sections marked by source reason.
Collect or structure feedback and merge it with semantic constraints.
If conflicts remain, route to senior-ui-ux-orchestrator council mode before design exploration.
If conflicts are clear, hand off to tech-stack-selector, then design exploration.

Non-Negotiable

The prototype is disposable. Do not use it as the production implementation base unless the user separately approves a rebuild/refactor plan.

Handoff Shape

Concept path:
Prototype path:
Feedback path:
Conflicts path:
Decision: clear | council-required
Next skills:

Validation

python3 $CODEX_HOME/skills/.system/skill-creator/scripts/quick_validate.py $CODEX_HOME/skills/concept-prototyper
python3 $CODEX_HOME/skills/senior-skill-architect/scripts/lint_production_skill.py $CODEX_HOME/skills/concept-prototyper

Files

What ships with it

3 files 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.

11d ago First seen · 48 lines · 63 tokens per session scan A d87c0c036ca0

Subscribe to this mod's changes

concept-prototyper is a skill published in the GitHub repository sergekostenchuk/ui-ux-agent-skill-system (23 stars, last pushed 2mo ago), licensed Apache-2.0. It adds 63 tokens to every session and 458 once invoked, about $0.0003 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 2026-08-30.

Design and UX Planning

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A self-contained WebGL2 hero: thin-film interference over a crushed-foil surface whose palette shifts with the viewing angle; move the cursor to tilt the film.

nexu-io/open-design · 41 tokens

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OpenDesign + BYOK: choosing and wiring your own model, hands-on — cost, quality, and the routing decision. Built as a decision-grade AI literacy deck for engineers, IT, applied-AI teams.

nexu-io/open-design · 53 tokens

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16:9 HTML deck in tactical-telemetry / CRT-terminal taste. Deactivated-CRT charcoal slides, white-phosphor monospace, hazard-red accent, scanline overlay, ASCII syntax, density over decoration. Distilled from Leonxlnx/taste-skill brutalist-skill (Tactical Telemetry mode).

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concept-prototyper