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.
npx skills add sutchan/Agent-Skills-Hub --skill prototype-designergit clone --depth 1 https://github.com/sutchan/Agent-Skills-HubWrote 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.
[](https://agentmods.dev/skills/sutchan/agent-skills-hub/prototype-designer)<a href="https://agentmods.dev/skills/sutchan/agent-skills-hub/prototype-designer"><img src="https://agentmods.dev/badge/skills/sutchan/agent-skills-hub/prototype-designer/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.
<a href="https://agentmods.dev/skills/sutchan/agent-skills-hub/prototype-designer"><img src="https://agentmods.dev/badge/skills/sutchan/agent-skills-hub/prototype-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00022 | $0.03866 |
| Opus 5 | $0.00011 | $0.01933 |
| Sonnet 5 | $0.00004 | $0.00773 |
| Haiku 4.5 | $0.00002 | $0.00387 |
Grade A, and why
prototype-designer 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 5d 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.
This is a copy
94% identical to Prototype Designer — 9 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 770 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prototype Designer
Validate ideas through interactive prototypes before writing code.
Core Principle
Test before you build.
Prototypes let you:
- Validate assumptions
- Test with real users
- Iterate faster than code
- Communicate ideas clearly
- Reduce development waste
Phase 1: Choosing Prototyping Tools
Tool Comparison
| Tool | Best For | Learning Curve | Fidelity |
|---|---|---|---|
| Figma | Full designs, collaboration | Medium | High |
| Framer | Code-based, advanced interactions | High | Very High |
| ProtoPie | Complex interactions, sensors | Medium | Very High |
| Adobe XD | Adobe ecosystem users | Low | High |
| InVision | Design handoff, simple clicks | Low | Medium |
| Axure | Complex logic, documentation | High | High |
Quick Start Recommendations
Beginner: Start with Figma
- Built-in to design tool
- No separate app needed
- Intuitive interactions
- Free for individuals
Advanced: Graduate to Framer or ProtoPie
- More complex interactions
- Variable support
- Conditional logic
- Sensor integration (mobile)
Phase 2: User Flow Design
What is a User Flow?
A user flow shows the path users take through your app to complete a task.
Example: User Registration Flow
Start
↓
Landing Page
↓
Click "Sign Up"
↓
Email Entry → Validation
↓ [Valid]
Password Entry → Validation
↓ [Valid]
Success Screen
↓
Onboarding Flow
Creating User Flows in Figma
1. Create Flow Frames:
Frames needed:
├── 01-landing
├── 02-signup-form
├── 03-email-verification
├── 04-success
└── 05-onboarding-step-1
2. Add Interactions:
Click "Sign Up" button → Navigate to 02-signup-form
Click "Submit" → Navigate to 03-email-verification
Click "Continue" → Navigate to 04-success
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.
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.
- 5d ago First seen · 770 lines · 22 tokens per session scan A 9e49d0677e2d
prototype-designer is a skill published in the GitHub repository sutchan/Agent-Skills-Hub (2 stars, last pushed yesterday), licensed MIT. It adds 22 tokens to every session and 3,866 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. It is 94% identical to Prototype Designer, differing in 9 lines, and is treated as a copy.
Other skills, from other repositories
Prototype Designer
Create interactive prototypes, design user flows, implement prototype testing strategies, and manage handoff to development. Validate ideas before building.
test-driven-development
Use when implementing any feature or bugfix, before writing implementation code.
review-core-correctness
Normative mandatory reviewer for correctness, contracts, architecture sanity, UX behavior, code quality and tests in the explyt spring-plugin codebase. Use during orchestrated code review of a PR, diff, commit or branch, or when asked to review correctness, logic, architecture or test coverage of plugin changes.
design-system-architect
Expert guide for designing, building, and maintaining scalable UI design systems with design tokens, headless primitives, Material Design 3 (M3), Tailwind v4 @theme, and WCAG 2.2 accessibility.
ui-ux-pro-max
Comprehensive design guide & BM25 search engine for web and mobile applications across 11 tech stacks / Panduan desain komprehensif & mesin pencari BM25 untuk aplikasi web dan mobile di 11 tech stack.
e2e-testing-expert
Expert guide for End-to-End (E2E) testing with Playwright, unit/integration testing with Vitest, and CI/CD automated testing pipeline setup / Panduan ahli pengujian End-to-End (E2E) dengan Playwright, pengujian unit/integrasi dengan Vitest, dan otomatisasi CI/CD.