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 modelcontextprotocol/ext-apps --skill create-mcp-appgit clone --depth 1 https://github.com/modelcontextprotocol/ext-appsWrote 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/modelcontextprotocol/ext-apps/create-mcp-app)<a href="https://agentmods.dev/skills/modelcontextprotocol/ext-apps/create-mcp-app"><img src="https://agentmods.dev/badge/skills/modelcontextprotocol/ext-apps/create-mcp-app/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/modelcontextprotocol/ext-apps/create-mcp-app"><img src="https://agentmods.dev/badge/skills/modelcontextprotocol/ext-apps/create-mcp-app.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Tool Misuse · line 126 Tool defaults are unsafe or overly permissive (e.g. disabled TLS verification, no authentication, world-writable permissions). Unsafe defaults widen the attack surface.Fix: Override unsafe defaults with secure settings (verify=True, auth required, restrictive permissions). Review and harden all tool configurations.
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 | $0.00077 | $0.01954 |
| Opus 5.5 | $0.00031 | $0.00782 |
| Sonnet 5.5 | $0.00015 | $0.00391 |
| Haiku 4.5 | $0.00008 | $0.00195 |
Grade A, and why
create-mcp-app 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.
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.
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.
- 1mo ago Changed · +3 lines 50286eca2275
- 1mo ago First seen · 185 lines · 77 tokens per session scan A fb8897196a6e
create-mcp-app is a skill published in the GitHub repository modelcontextprotocol/ext-apps (2,961 stars, last pushed 20d ago), with no licence file. It adds 77 tokens to every session and 1,954 once invoked, about $0.0003 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.
Other skills, from other repositories
create-tool
ALWAYS use this skill when the user asks to build, modify, or audit a FrontMCP tool. Covers everything inside @Tool({...}): class and function-style tools, Zod input/output schemas with derived execute() types, dependency injection (this.get / this.tryGet), error handling (this.fail, MCP error classes), throttling…
migrate-radix-to-base
Migrates React projects and components from Radix UI to Base UI. Use when asked to migrate from radix, move to base-ui, convert radix primitives, or switch a shadcn project's base library. Handles single components ("migrate accordion") and whole projects.
compiler-port
Port a compiler pass from TypeScript to Rust. Gathers context, plans the port, implements in a subagent with test-fix loop, then reviews.
tamagui-v6-config
Tamagui v6 theme system: the light/dark/accent/brand/inverse/level/active theme family, the background-active one-off key, and recipe-tree authoring with createV6Config. Use when choosing a theme for a surface, building a selected/emphasis state, or authoring a custom v6 colors pack.
tamagui-theme-generator
Generate custom Tamagui themes, color palettes, and preview URLs. Use when creating or refining a color scheme, authoring light/dark palettes with brand accents, or previewing generated themes in the browser.
git-safety
Git safety rules. INVOKE WHEN: git push, force push, git reset, git clean, destructive git, push force, reset hard. NEVER force push or do destructive git operations.