Borrowing it
Nothing to install: this file belongs to Udhayaboopathi/A-complete-AI-Agent-Instruction-Library. 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/Udhayaboopathi/A-complete-AI-Agent-Instruction-Library/main/.cursor/skills/fastapi-nextjs-stack/SKILL.mdgit clone --depth 1 https://github.com/Udhayaboopathi/A-complete-AI-Agent-Instruction-LibraryWrote 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/udhayaboopathi/a-complete-ai-agent-instruction-library/fastapi-nextjs-stack)<a href="https://agentmods.dev/skills/udhayaboopathi/a-complete-ai-agent-instruction-library/fastapi-nextjs-stack"><img src="https://agentmods.dev/badge/skills/udhayaboopathi/a-complete-ai-agent-instruction-library/fastapi-nextjs-stack.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00298 |
| Opus 5 | $0.00039 | $0.00149 |
| Sonnet 5 | $0.00015 | $0.00060 |
| Haiku 4.5 | $0.00008 | $0.00030 |
Grade A, and why
fastapi-nextjs-stack 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.
What it actually says
FastAPI + Next.js Stack
Read Skill/FASTAPI_NEXTJS_STACK.md first and follow it exactly.
Required reads (this order)
Skill/FASTAPI_NEXTJS_STACK.mdDatabase/DATABASE_STRUCTURE.mdBackend/FASTAPI_ORM_STRUCTURE.mdFrontend/NEXTJS_FRONTEND_STRUCTURE.mdSecurity/SECURITY_LAYER.md
Confirm in four sentences (database deploy, backend modules, frontend feature folder, signing secret), then wait.
Work order
database/ (diff → deploy → in sync) → backend/ → security if public → frontend/
Cross-product stop
If a change would affect another product or another SaaS (shared DB, API, auth, tenants), stop and tell the user before editing or deploying. Use the CROSS-PRODUCT IMPACT block in FASTAPI_NEXTJS_STACK.md.
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 · 32 lines · 77 tokens per session scan A cf362a1a2d8a
fastapi-nextjs-stack is a skill published in the GitHub repository Udhayaboopathi/A-complete-AI-Agent-Instruction-Library (1 stars, last pushed 9d ago), licensed MIT. It adds 77 tokens to every session and 298 once invoked, about $0.0004 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 2026-08-31.
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