Borrowing it
Nothing to install: this file belongs to xiaolai/vmark. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/xiaolai/vmark/main/.claude/skills/react-app-dev/SKILL.mdgit clone --depth 1 https://github.com/xiaolai/vmarkWrote 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/xiaolai/vmark/react-app-dev)<a href="https://agentmods.dev/skills/xiaolai/vmark/react-app-dev"><img src="https://agentmods.dev/badge/skills/xiaolai/vmark/react-app-dev/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/xiaolai/vmark/react-app-dev"><img src="https://agentmods.dev/badge/skills/xiaolai/vmark/react-app-dev.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00043 | $0.00199 |
| Opus 5.5 | $0.00017 | $0.00080 |
| Sonnet 5.5 | $0.00009 | $0.00040 |
| Haiku 4.5 | $0.00004 | $0.00020 |
Grade A, and why
react-app-dev 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 2mo 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.
What it actually says
React App Dev (VMark)
Overview
Apply VMark frontend conventions for React 19 + Zustand v5 + Tailwind v4 + shadcn/ui.
Workflow
- Read relevant files before editing (components, hooks, stores, plugins).
- Follow the VMark rules in
AGENTS.md(no store destructuring; use selectors). - Keep code files under ~300 lines; split when needed.
- Prefer local feature boundaries; avoid cross-feature imports.
- Update tests for new behavior and run
pnpm check:allwhen asked.
References
references/paths.mdfor common source locations and scans.- Docs map:
dev-docs/README.md.
What ships with it
2 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.
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.
- 2mo ago First seen · 21 lines · 43 tokens per session scan A d84a22c0e97f
react-app-dev is a skill published in the GitHub repository xiaolai/vmark (878 stars, last pushed yesterday), licensed ISC. It adds 43 tokens to every session and 199 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.
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