fastapi-components-and-validation

fastapi-components-and-validation is a cursor rule for Cursor from paulpham157/paul-s-cursor-rules. It costs 0 tokens per session (64 once invoked), scanned A, original, MIT.

A FastAPI guideline for defining routes with plain Python functions and Pydantic models, which check incoming data and describe returned data.

In plain words
What is it for?
Use it when creating FastAPI routes, validating request data, defining response schemas, or adding return type annotations.
Why use it?
It makes API inputs and outputs more predictable and keeps route definitions easy to understand.

Cursor rule for Cursor

Written for Cursor: a Cursor rule (.mdc).

Good fit Use it when creating FastAPI routes, validating request data, defining response schemas…

Compare 6 cursor rules from other repositories ↓
Install with agentmods
npx agentmods add rules/paulpham157/paul-s-cursor-rules/fastapi-components-and-validation
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.

Clone the repo
git clone --depth 1 https://github.com/paulpham157/paul-s-cursor-rules

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 fastapi-components-and-validation

README.md
[![agentmods](https://agentmods.dev/badge/rules/paulpham157/paul-s-cursor-rules/fastapi-components-and-validation.svg)](https://agentmods.dev/rules/paulpham157/paul-s-cursor-rules/fastapi-components-and-validation)
Your own site
<a href="https://agentmods.dev/rules/paulpham157/paul-s-cursor-rules/fastapi-components-and-validation"><img src="https://agentmods.dev/badge/rules/paulpham157/paul-s-cursor-rules/fastapi-components-and-validation.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 64 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
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 5.1 $0.00000 $0.00064
Opus 5 $0.00000 $0.00032
Sonnet 5 $0.00000 $0.00013
Haiku 4.5 $0.00000 $0.00006

Measured 3d ago against content hash 365736548b6c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

fastapi-components-and-validation 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 3d 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.

Origin

Copies of this mod

2 near-identical copies found in the catalogue:

1/framework_rules/rules/cursorrules-file-cursor-ai-python-fastapi-api/fastapi-components-and-validation.mdc · 6 lines

What it actually says


description: Specifies the use of functional components and Pydantic models for input validation in FastAPI routes. globs: **/routers/*.py

  • Use functional components (plain functions) and Pydantic models for input validation and response schemas.
  • Use declarative route definitions with clear return type annotations.
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. 3d ago First seen · 6 lines · 64 tokens per session scan A 365736548b6c

Subscribe to this mod's changes

fastapi-components-and-validation is a cursor rule published in the GitHub repository paulpham157/paul-s-cursor-rules (27 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 64 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 2026-09-03.