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 AmariahAK/atlarix-skills --skill acr-fastapi-production-architecture-cursorrules-prompt-filegit clone --depth 1 https://github.com/AmariahAK/atlarix-skillsWrote 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/amariahak/atlarix-skills/acr-fastapi-production-architecture-cursorrules-prompt-file)<a href="https://agentmods.dev/skills/amariahak/atlarix-skills/acr-fastapi-production-architecture-cursorrules-prompt-file"><img src="https://agentmods.dev/badge/skills/amariahak/atlarix-skills/acr-fastapi-production-architecture-cursorrules-prompt-file/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/amariahak/atlarix-skills/acr-fastapi-production-architecture-cursorrules-prompt-file"><img src="https://agentmods.dev/badge/skills/amariahak/atlarix-skills/acr-fastapi-production-architecture-cursorrules-prompt-file.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00014 | $0.02053 |
| Opus 5 | $0.00007 | $0.01026 |
| Sonnet 5 | $0.00003 | $0.00411 |
| Haiku 4.5 | $0.00001 | $0.00205 |
Grade A, and why
Cursor rules for FastAPI services with router/service/repository boundaries, typ 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 12d 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cursor rules for FastAPI services with router/service/repository boundaries, typ
When to use this skill
Cursor rules for FastAPI services with router/service/repository boundaries, typed provider adapters, bulkhead isolation, idempotency, and domain exceptions.
Source
FastAPI Production Architecture Rules
Principles for production-ready FastAPI services.
LAYER ARCHITECTURE (Principles A1-A8)
This codebase follows strict 4-layer architecture: Router → Service → Repository → ORM/HTTP/Storage. Imports flow downward only. Each layer has hard boundaries you must NOT cross.
Router rules (app/routers/**)
- Handlers are THIN: ≤10 lines of executable code per handler
- Allowed imports: fastapi, app.schemas., app.core.deps, app.services.
- FORBIDDEN imports: sqlalchemy, httpx, boto3, app.models., app.repositories.
- Every endpoint declares response_model= for OpenAPI fidelity
- Every protected/business endpoint requires user_id: str = Depends(get_current_user_id)
- Public endpoints (health checks, webhooks, callbacks) are exempt from auth
- Business logic lives in services. Routers parse input, call one service method, return response.
GOOD: @router.post("/wallet/charge", response_model=WalletResponse, status_code=201) async def charge( req: ChargeRequest, user_id: str = Depends(get_current_user_id), svc: WalletUserService = Depends(get_wallet_service), ) -> WalletResponse: wallet = await svc.charge( user_id=user_id, amount=req.amount, idempotency_key=req.idempotency_key, ) return WalletResponse.from_domain(wallet)
BAD (business logic + SQL in router): @router.post("/wallet/charge") async def charge(req: ChargeRequest, db: Session = Depends(get_db)): wallet = db.query(Wallet).filter(Wallet.user_id == user_id).with_for_update().one() ...
Service rules (app/services/**)
- FORBIDDEN imports: sqlalchemy, httpx, boto3, redis, FastAPI Request/Response/HTTPException
- Constructor injects Protocol-typed dependencies, not concrete classes
- Raise domain exceptions (InsufficientFundsError), not HTTPException
What ships with it
1 file 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.
- 12d ago First seen · 222 lines · 14 tokens per session scan A a60ccd237df0
Cursor rules for FastAPI services with router/service/repository boundaries, typ is a skill published in the GitHub repository AmariahAK/atlarix-skills (2 stars, last pushed 5d ago), licensed Apache-2.0. It adds 14 tokens to every session and 2,053 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 2026-08-31.
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