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Agent skill

UI Mockup

by mvschwarz in mvschwarz/openrig

Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing.

Apache-2.0Auto-check passedFrontend & Design

Install UI Mockup

skills CLI
$ npx skills add mvschwarz/openrig --skill ui-mockup -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install mvschwarz/openrig ui-mockup --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/mvschwarz/openrig.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/_canonical/pm/ui-mockup .claude/skills/ui-mockup && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
ui-mockup
GitHub stars
6.2k
Token cost
~654 tokens
SKILL.md length
321 words
Files
1
Skills in repo
49
Repo updated
First seen
Licence
Apache-2.0

At a glance

Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing.

  • Works in 4 steps: Understand What to Mockup → Gather Real Data → Create the Mockup → …
  • Tasks that involve UI design
  • SKILL.md covers Three Fidelity Levels, Process and Guidelines
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

UI Mockup is an agent skill from mvschwarz/openrig. Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing.

Its SKILL.md is about 650 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Frontend & Design, covering UI design and HTML artifacts. The repository describes itself as: Build your own network of agents from Claude Code, Codex and Pi: persistent teams with roles, shared context and owned work. The licence is Apache-2.0.

When your agent uses it

  • Tasks that involve UI design
  • Tasks that involve HTML artifacts

Example prompts

  • “/ui-mockup”

Workflow steps

4 steps, taken from the step headings in SKILL.md.

  1. Understand What to Mockup
  2. Gather Real Data
  3. Create the Mockup
  4. Connect to Requirements

What it can do on your machine

Read from SKILL.md and the folder at commit a29dfbc. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md.

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

UI Mockup loads about 654 tokens when it runs. Until then it costs about 48 tokens; SKILL.md has 321 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~48
When it runs · the whole SKILL.md, loaded when a task matches
~654

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from mvschwarz/openrig at commit a29dfbc, republished under its Apache-2.0 licence (© mvschwarz). 321 words, ~654 tokens.

Download SKILL.mdSave it as .claude/skills/ui-mockup/SKILL.md (or your agent's skills folder).
name
ui-mockup
description
Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing.

You are a UI prototyping assistant that creates mockups for product managers at three fidelity levels.

Three Fidelity Levels

Level 1: ASCII Wireframes (fastest, during requirements writing)

Text-based wireframes in markdown showing layout, information hierarchy, and key interactions. Where: supporting/mockup-ascii.md

Rules:

  • Use box-drawing characters for structure
  • Show real data, not placeholder text
  • Annotate interactive elements
  • Note key behaviors below each wireframe
  • Include frontmatter with screen list
Level 2: Standalone HTML Mockups (for delivery with requirements)

Self-contained HTML files that look like the real app. Portable, no dependencies except Google Fonts. Where: supporting/mockup-{feature}.html

Rules:

  • Match the application's existing styling exactly
  • Use real data from the codebase
  • Only show what's in SPEC.md
  • Self-contained single HTML file
  • Screen switcher nav to toggle between screens via JavaScript
  • Keep under 1,000 lines
Level 3: Live Prototypes (for interaction testing)

Real framework pages using the actual component library. Runs in the dev server.

Rules:

  • Use ONLY existing components — don't create new ones
  • Hardcoded mock data, no API calls
  • Match existing page styling exactly

Process

Step 1: Understand What to Mockup

Read feature folder docs first:

  • SPEC.md — acceptance criteria define what screens are needed
  • validation.md — the narrowest wedge tells you what's most important to show
  • background.md — customer drivers and competitive context inform what to emphasize

Then ask the PM about fidelity level and specific screens.

Step 2: Gather Real Data
  • Read the requirements acceptance criteria
  • Read existing codebase components to match styling
  • Pull real data from seed files or config
  • Never use placeholder data
Step 3: Create the Mockup
Step 4: Connect to Requirements
  • Save to supporting/
  • Reference from background.md under "Visual References"
  • Note in requirements if the mockup informed acceptance criteria

Guidelines

  • Use real data. Real names, real ranges, real hierarchies.
  • Only show what's in SPEC.md. Don't add features beyond the requirement.
  • Less is more. 3-5 screens beats 10.
  • Match the app exactly. Read existing code and match styling patterns.
  • Tell the PM what's real vs mocked.

© mvschwarz, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in skills/_canonical/pm/ui-mockup of mvschwarz/openrig.

Open the folder on GitHubat commit a29dfbc

Compare with similar skills

UI Mockup next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

UI Mockup compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
UI Mockup this skillmvschwarz/openrig6.2k—~654Automated safety check: PassApache-2.0
LobeHub Interactive Prototypelobehub/lobehub83k—~1.6kAutomated safety check: PassCustom licence
HTMLplannotator/effective-html3.6k—~1.6kAutomated safety check: PassMIT
Codemie HTML Reportcodemie-ai/codemie-code294—~3.3kAutomated safety check: PassApache-2.0
Web Design EngineerConardLi/garden-skills13k—~8.8kAutomated safety check: PassMIT
Single-File UI Design ExplorationJayZeeDesign/awesome-claude-skills171—~493Automated safety check: PassNone

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Categories

Questions about UI Mockup

What does UI Mockup do?

Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing. UI Mockup is an agent skill from mvschwarz/openrig. Create UI mockups at three fidelity levels — ASCII wireframes for quick iteration, standalone HTML mockups for delivery with requirements, and live prototypes for interaction testing.

When should I use UI Mockup?

UI Mockup fits situations like: tasks that involve UI design; tasks that involve HTML artifacts.

How do I install UI Mockup in Claude Code?

Run `npx skills add mvschwarz/openrig --skill ui-mockup -a claude-code`. Or copy the skill folder (skills/_canonical/pm/ui-mockup in mvschwarz/openrig) into .claude/skills/ui-mockup in your project. Claude Code loads it when a task matches its description.

How do I install UI Mockup in Codex?

Run `npx skills add mvschwarz/openrig --skill ui-mockup -a codex`. Or copy the skill folder (skills/_canonical/pm/ui-mockup in mvschwarz/openrig) into .agents/skills/ui-mockup in your project. Codex loads it when a task matches its description.

Can I use UI Mockup in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mvschwarz/openrig --skill ui-mockup -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/ui-mockup, .gemini/skills/ui-mockup, .github/skills/ui-mockup and .opencode/skills/ui-mockup in your project.

What does UI Mockup need to run?

SKILL.md names no scripts, command-line tools or credentials: UI Mockup is instructions for the agent only.

Does UI Mockup access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is UI Mockup safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does UI Mockup use?

UI Mockup is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does UI Mockup use?

About 654 tokens (SKILL.md is roughly 2.6k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to UI Mockup?

Skills that share tags, products or a category with UI Mockup: LobeHub Interactive Prototype (lobehub/lobehub, 83k stars), HTML (plannotator/effective-html, 3.6k stars), Codemie HTML Report (codemie-ai/codemie-code, 294 stars) and Web Design Engineer (ConardLi/garden-skills, 13k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains UI Mockup?

mvschwarz (a GitHub user) maintains it in mvschwarz/openrig, which has 6,242 GitHub stars. The repository holds 49 skills in this directory. The repository was last updated on October 9, 2026.

Source: mvschwarz/openrig on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.