routes

routes is a cursor rule for Cursor from setmpp/awesome-cursor-rules-2026. It costs 0 tokens per session (204 once invoked), scanned A, original, MIT.

A set of rules for writing FastAPI route handlers, the functions that receive API requests and return responses. It specifies validation, response schemas, dependency syntax, error handling, and separation of business logic.

In plain words
What is it for?
Use it when adding or modifying typed, asynchronous FastAPI endpoints under versioned paths such as /api/v1, with Pydantic input and response models.
Why use it?
It prevents route code from becoming a mixture of request handling, database details, and business rules, while avoiding common outdated patterns.

Cursor rule for Cursor

Install

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.

agentmods
npx agentmods add rules/setmpp/awesome-cursor-rules-2026/routes
Clone the repo
git clone --depth 1 https://github.com/setmpp/awesome-cursor-rules-2026

Made for: Cursor.

Wrote 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.

agentmods badge for routes

README.md
[![agentmods](https://agentmods.dev/badge/rules/setmpp/awesome-cursor-rules-2026/routes.svg)](https://agentmods.dev/rules/setmpp/awesome-cursor-rules-2026/routes)
Your own site
<a href="https://agentmods.dev/rules/setmpp/awesome-cursor-rules-2026/routes"><img src="https://agentmods.dev/badge/rules/setmpp/awesome-cursor-rules-2026/routes.svg" alt="Measured on agentmods" height="20"></a>
Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 204 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00204
Opus 5 $0.00000 $0.00102
Sonnet 5 $0.00000 $0.00041
Haiku 4.5 $0.00000 $0.00020

Measured 4d ago against content hash 631c5b33f8dd, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

routes 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 4d 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.

profiles/python-fastapi/.cursor/rules/routes.mdc · 22 lines

What it actually says

FastAPI Route Rules

  • Always declare response_model explicitly.
  • Use Annotated[Type, Depends(...)] syntax for dependencies, not the old dep: Type = Depends(...).
  • Validate input with Pydantic models. Never accept raw dict.
  • Business logic lives in services/, not in route function. Route only: parse input, call service, format response.
  • Use HTTPException for 4xx. For 5xx, let propagate — middleware handles logging.
  • Tag every router: tags=["users"].
  • Mount under /api/v1/....

Anti-patterns

  • def instead of async def for I/O routes.
  • Try/except that catches Exception and returns 200.
  • ORM model returned directly — always go through Pydantic schema.
Changes

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.

  1. 4d ago First seen · 22 lines · 0 tokens per session scan A 631c5b33f8dd

Subscribe to this mod's changes

routes is a cursor rule published in the GitHub repository setmpp/awesome-cursor-rules-2026 (0 stars, last pushed 4mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 204 tokens. 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.