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app-mockup

app-mockup is a skill for Claude Code from tercumantanumut/selene. It costs 47 tokens per session (743 once invoked), scanned A, original, MIT.

A local renderer that places a real app screenshot inside a browser, phone, tablet, laptop, or window frame. It creates repeatable image exports from an existing screenshot.

In plain words
What is it for?
Use it for app-store images, documentation, marketing visuals, and framed previews of web or mobile screens.
Why use it?
It removes the need to manually build device frames or use image-generation tools for straightforward UI previews.

Skill for Claude Code

Written for Claude Code: allowed-tools in frontmatter.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is --input ./tmp/pricing-page.png \.

Part of the app-mockup-kit plugin — 1 skill, 1 command shipped together

not rated 172repo today A scan SkillSpector: pass 47 tokens original MIT

Good fit Use it for app-store images, documentation, marketing visuals, and framed previews of web or mobile screens.

Compare 6 skills from other repositories ↓
View source ↗ tercumantanumut/selene selene.engineer
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/tercumantanumut/selene
agentmods
npx agentmods add skills/tercumantanumut/selene/app-mockup

Made for: Claude Code.

Or install app-mockup-kit, the plugin that ships this one along with the rest of its 1 skill, 1 command.

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 app-mockup

README.md
[![agentmods](https://agentmods.dev/badge/skills/tercumantanumut/selene/app-mockup/github.svg)](https://agentmods.dev/skills/tercumantanumut/selene/app-mockup)
Your own site
<a href="https://agentmods.dev/skills/tercumantanumut/selene/app-mockup"><img src="https://agentmods.dev/badge/skills/tercumantanumut/selene/app-mockup/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.

agentmods 80×15 button for app-mockup

Your own site · 80×15
<a href="https://agentmods.dev/skills/tercumantanumut/selene/app-mockup"><img src="https://agentmods.dev/badge/skills/tercumantanumut/selene/app-mockup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 47 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 743 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 $0.00047 $0.00743
Opus 5.5 $0.00019 $0.00297
Sonnet 5.5 $0.00009 $0.00149
Haiku 4.5 $0.00005 $0.00074

Measured 1mo ago against content hash f092b5e9469a, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

app-mockup 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 1mo 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.

selene-plugins/app-mockup-kit/skills/app-mockup/SKILL.md · 101 lines

How it starts

The opening of the file, as written. The whole thing — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.

App Mockup

Use this skill when a user wants an existing screenshot wrapped in a browser or device frame.

Do use it for

  • browser-framed web app screenshots
  • phone, tablet, or laptop mockups for real app screens
  • deterministic export workflows from terminal commands
  • marketing or documentation visuals generated from existing UI screenshots

Do not use it for

  • imaginary UI generation from text only
  • lifestyle scenes or product photography
  • diffusion/ML image editing
  • claiming photoreal exports when only vector framing is requested

Renderer contract

Run the local renderer in this plugin:

npm --prefix selene-plugins/app-mockup-kit run render -- \
  --input <path-or-image-url> \
  --output <output.svg> \
  --preset <preset>

Supported presets

  • browser-chrome
  • browser-safari
  • iphone-14-pro
  • pixel-6-pro
  • ipad-pro
  • macbook-pro
  • window
  • plain

Workflow

  1. Identify the screenshot source.

    • If the user gives a file path, use it directly.
    • If the user gives a webpage URL, capture a screenshot first with browser tooling, then render the mockup.
    • If the user gives an image URL that already points to a screenshot, pass it directly to the renderer.

  2. Infer the right preset.

    • web app or dashboard -> browser-chrome unless Safari styling is explicitly requested
    • iOS mobile app -> iphone-14-pro
    • Android mobile app -> pixel-6-pro
    • tablet layout -> ipad-pro
    • laptop hero shot -> macbook-pro

  3. Render with explicit options.

    • Prefer SVG output unless the user explicitly requires a raster export pipeline.
    • Use descriptive output names.
    • Add title, subtitle, URL label, background, padding, and shadow only when they improve the requested result.

  4. Verify the artifact.

    • Confirm the output file exists.
    • Report the output path, preset, and notable options used.

Example commands

npm --prefix selene-plugins/app-mockup-kit run render -- \
  --input ./tmp/pricing-page.png \
  --output ./out/pricing-browser-mockup.svg \
  --preset browser-chrome \
  --url selene.so/pricing \
  --background gradient:#0f172a,#2563eb \
  --padding 80 \
  --shadow lifted

Read the full file on GitHub · 101 lines

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. 1mo ago First seen · 101 lines · 47 tokens per session scan A f092b5e9469a

Subscribe to this mod's changes

app-mockup is a skill published in the GitHub repository tercumantanumut/selene (172 stars, last pushed today), licensed MIT. It adds 47 tokens to every session and 743 once invoked, about $0.0002 per session on Opus 5.5. 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.

Creative and mediaDesign and UXLLMagentcodebase-indexingdiffusion-modelsknowledge-baselong-term-memory
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