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 sawrus/agent-guides --skill app-buildergit clone --depth 1 https://github.com/sawrus/agent-guidesWrote 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/sawrus/agent-guides/app-builder)<a href="https://agentmods.dev/skills/sawrus/agent-guides/app-builder"><img src="https://agentmods.dev/badge/skills/sawrus/agent-guides/app-builder/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/sawrus/agent-guides/app-builder"><img src="https://agentmods.dev/badge/skills/sawrus/agent-guides/app-builder.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 | $0.00026 | $0.01208 |
| Opus 5 | $0.00013 | $0.00604 |
| Sonnet 5 | $0.00005 | $0.00242 |
| Haiku 4.5 | $0.00003 | $0.00121 |
Grade A, and why
app-builder 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 136 lines — stays where its author put it; the contents beside it link to each section on GitHub.
App Builder Skill
Analyzes requests, selects tech stack, scaffolds structure, coordinates agents.
Project Type Detection
| Keywords | Project Type | Default Stack |
|---|---|---|
| dashboard, admin, crud, internal tool | Full-stack web | Next.js + Prisma + Postgres |
| SaaS, subscription, billing | SaaS web | Next.js + Stripe + Clerk + Prisma |
| API, microservice, backend | REST API | FastAPI (Python) or Express (Node) |
| mobile app, iOS, Android | Mobile | React Native + Expo |
| CLI, command line, terminal | CLI tool | Node.js + Commander or Python + Typer |
| monorepo, multiple apps | Monorepo | Turborepo + pnpm |
Default 2025 Stack
Frontend: Next.js 15 (App Router) + TypeScript strict + Tailwind + shadcn/ui
Backend: Next.js Server Actions (collocated) or FastAPI (standalone API)
Database: PostgreSQL via Prisma (JS) or SQLAlchemy async (Python)
Auth: Clerk (SaaS/Web) or custom JWT (API-only)
Testing: Vitest + Playwright (JS) | pytest + Playwright (Python)
Deploy: Vercel (Next.js) | Railway/Render (FastAPI)
Next.js Full-Stack Directory Structure
src/
├── app/ # Routes only — thin layer
│ ├── layout.tsx
│ ├── (auth)/ # Route group — auth pages
│ ├── (dashboard)/ # Route group — protected pages
│ └── api/[resource]/route.ts
│
├── features/ # Feature-based modules (primary work happens here)
│ ├── orders/
│ │ ├── components/ # UI — OrderCard, OrderList
│ │ ├── actions.ts # Server Actions — createOrder, cancelOrder
│ │ ├── queries.ts # Data fetching — getOrder, listOrders
│ │ └── types.ts
│ └── auth/
│ ├── components/
│ ├── actions.ts
│ └── queries.ts
│
├── shared/
│ ├── components/ui/ # Reusable: Button, Input, Card
│ └── lib/ # Utilities, formatters, constants
│
└── server/ # Server-only (never imported in client components)
├── db/ # Prisma client
├── auth/ # Auth config
└── services/ # External API integrations
What ships with it
19 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.
- agent-coordination.md 5.4 KB
- feature-building.md 1.1 KB
- project-detection.md 1.3 KB
- scaffolding.md 3.5 KB
- tech-stack.md 886 B
- templates/astro-static/TEMPLATE.md 1.7 KB
- templates/chrome-extension/TEMPLATE.md 1.9 KB
- templates/cli-tool/TEMPLATE.md 1.7 KB
- templates/electron-desktop/TEMPLATE.md 1.8 KB
- templates/express-api/TEMPLATE.md 1.7 KB
- templates/flutter-app/TEMPLATE.md 1.8 KB
- templates/monorepo-turborepo/TEMPLATE.md 1.8 KB
- templates/nextjs-fullstack/TEMPLATE.md 1.6 KB
- templates/nextjs-saas/TEMPLATE.md 2.2 KB
- templates/nextjs-static/TEMPLATE.md 2.0 KB
- templates/nuxt-app/TEMPLATE.md 2.1 KB
- templates/python-fastapi/TEMPLATE.md 1.7 KB
- templates/react-native-app/TEMPLATE.md 1.9 KB
- templates/SKILL.md 1.5 KB
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.
- 7d ago First seen · 136 lines · 26 tokens per session scan A 590225133391
app-builder is a skill published in the GitHub repository sawrus/agent-guides (17 stars, last pushed 10d ago), licensed MIT. It adds 26 tokens to every session and 1,208 once invoked, about $0.0001 per session on Opus 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 2026-09-03.
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