Python fastapi
Complete guide to minimal universal configuration files compatible with all major AI coding agents.
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Implement or review FastAPI route, schema, dependency, service, and pytest changes. Use when the user asks to add endpoints, change API behavior, validate Pydantic models, fix FastAPI bugs, or update Python API tests.
The file declares its own license as MIT. That is the author’s claim about this one file, and it is not the same thing as the license GitHub reports for the repository, which is listed with the other numbers below.
SKILL.md
0.9 KB, 120 tokens by cl100k_base, as published. Nobody here has run it
FastAPI API Change
Steps
- Read
app/main.py, the relevant router, schemas, and service files. - Update Pydantic request and response models before changing handlers.
- Keep business logic in services and persistence in database modules.
- Add or update pytest coverage for success, validation, and failure paths.
- Run the smallest relevant pytest command, then
ruff check .if style changed.
Example
Input: "Add an endpoint to reserve inventory."
Output: Router change, schema updates, service logic, and focused pytest tests.
Gives 0 of the 12 instructions most apis services skills give in 120 tokens
Counted across 424 of the 426 authors here whose files we hold, read 2026-08-06
- use plural nouns for resource namesin 41 of 424, across 32 files
- use cursor-based pagination for large datasetsin 35 of 424, across 20 files
- include rate limit headers in responsesin 25 of 424, across 13 files
- Use kebab-case for multi-word resourcesin 23 of 424, across 13 files
- version APIs in the URL pathin 19 of 424, across 9 files
- use semantic HTTP status codesin 18 of 424, across 8 files
- verify webhook signaturesin 18 of 424, across 11 files
- use query parameters for filteringin 17 of 424, across 6 files
- use async database operationsin 14 of 424, across 7 files
- wrap successful responses in a data fieldin 13 of 424, across 3 files
- prefix sorting parameters with a hyphen for descending orderin 13 of 424, across 3 files
- set appropriate HTTP status codesin 13 of 424, across 6 files
Said here and by no other author read
- read main router schema and Service files
- update Pydantic models before handlers
- keep business logic in Service modules
- keep persistence in Database modules
- add tests for Success validation and failure paths
- run the smallest relevant pytest command
Grouped from the skills themselves: near-identical wordings counted once, and counted by distinct author, so one author publishing three of these counts once. Length counted with cl100k_base; the agent that loads this file may tokenize it differently.