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building-mini-apps

building-mini-apps is a skill for Claude Code from zpyoung/quirk. It costs 113 tokens per session (3,371 once invoked), scanned A, original, no licence file.

A guide for building small React applications that run locally and save data on the user's machine. React is a tool for making web interfaces from reusable pieces.

In plain words
What is it for?
Use it when making a local tracker, saved-data tool, or other small app that someone will keep and run on their own computer.
Why use it?
It gives a small app a planned way to organize screens and actions instead of producing an unspecified generic interface.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the quirk plugin — 31 skills, 2 commands, 3 hooks shipped together

not rated 6repo 5d ago A scan 113 tokens custom licence

Good fit Use it when making a local tracker, saved-data tool, or other small app that someone will keep and run on their own computer.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/zpyoung/quirk/building-mini-apps
View source ↗ zpyoung/quirk
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 zpyoung/quirk --skill building-mini-apps
Clone the repo
git clone --depth 1 https://github.com/zpyoung/quirk

Made for: Claude Code.

Or install quirk, the plugin that ships this one along with the rest of its 31 skills, 2 commands, 3 hooks.

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 building-mini-apps

README.md
[![agentmods](https://agentmods.dev/badge/skills/zpyoung/quirk/building-mini-apps/github.svg)](https://agentmods.dev/skills/zpyoung/quirk/building-mini-apps)
Your own site
<a href="https://agentmods.dev/skills/zpyoung/quirk/building-mini-apps"><img src="https://agentmods.dev/badge/skills/zpyoung/quirk/building-mini-apps/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 building-mini-apps

Your own site · 80×15
<a href="https://agentmods.dev/skills/zpyoung/quirk/building-mini-apps"><img src="https://agentmods.dev/badge/skills/zpyoung/quirk/building-mini-apps.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 113 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,371 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 unknown 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 $0.00113 $0.03371
Opus 5.5 $0.00045 $0.01348
Sonnet 5.5 $0.00023 $0.00674
Haiku 4.5 $0.00011 $0.00337

Measured 15d ago against content hash 349e26b87559, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

building-mini-apps 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 15d ago.

The scan reads SKILL.md. This mod also ships 7 executable files (gallery/eslint.config.js, gallery/src/gallery/use-hash-route.ts, gallery/src/lib/mini/press.ts, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

skills/building-mini-apps/SKILL.md · 135 lines

The source is not reproduced here

A licence we could not identify

The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.

Read it on GitHub

Files

What ships with it

60 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.

  1. 15d ago First seen · 135 lines · 113 tokens per session scan A 349e26b87559

Subscribe to this mod's changes

building-mini-apps is a skill published in the GitHub repository zpyoung/quirk (6 stars, last pushed 5d ago), with no licence file. It adds 113 tokens to every session and 3,371 once invoked, about $0.0005 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 2026-10-27.

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Related

building-mini-apps compared with skills from other repositories

building-mini-apps next to 6 skills from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
building-mini-appszpyoung/quirkSkill65d agononeA113Claude Code
build-ghost-appTryGhost/GhostSkill56ktodayMITA44Claude Code, Codex
chakra-ui-builderchakra-ui/chakra-uiSkill41ktodayMITA214Claude Code, Codex
material-ui-tailwindmui/material-uiSkill99ktodayMITA67Claude Code, Codex
fuzzy-rankingTanStack/tableSkill29k9d agoMITA62Claude Code, Codex
r3f-best-practiceszebbern/claude-code-guideSkill4.7ktodayMITA74Claude Code, Codex
git-safetytamagui/tamaguiSkill14ktodayMITA0Claude Code