fastapi-python Skill (Mindrally) for Claude Code: FastAPI

Makes Claude write FastAPI backends in a consistent functional style with Pydantic, async I/O and guard clauses.

Installs: 13.9K; on skills.sh
Stars: 289; on GitHub
Updated: Oct 2026; last repo commit

The skill puts Claude in the role of a FastAPI and Python backend expert and gives it a style guide. Prefer plain functions over classes, use type hints and Pydantic models, use async for database and API calls, and handle errors with early returns and guard clauses.

It names a stack: FastAPI, Pydantic v2, asyncpg or aiomysql and SQLAlchemy 2.0. It is a short ruleset and bundles no scripts, so it does not scaffold a project or install those packages itself.

Good for

Python developers building REST APIs with FastAPI
Teams that want one coding style for FastAPI services
Developers moving from Cursor rules to Claude Code skills

Install fastapi-python

Claude Code

Copy this prompt.

Install the fastapi-python skill in Claude Code. Run this command:

npx skills add https://github.com/mindrally/skills --skill fastapi-python

Then check that it loaded and tell me how to use it.

2
Paste it into Claude Code. It shows the change and asks before running it.

Requires Node.js.

From its listing on skills.sh. Source.

What's in the skill

When it loads

Expert in FastAPI Python development with best practices for APIs and async operations

Sections in SKILL.md

Key Principles
Python/FastAPI Standards
Error Handling
FastAPI-Specific Guidelines
Performance Optimization
Key Conventions
Dependencies

Key facts

Author: Mindrally (named as maintainer in the SKILL.md metadata)
Repository: mindrally/skills
Installs on skills.sh: 13,942 as of 2026-11-02
GitHub stars: 289 for the whole mindrally/skills repo
License: Apache-2.0 (repo)
Last repo commit: 2026-10-08
What is inside: 1 file: SKILL.md. It bundles no scripts.
skills.sh audits: Gen Agent Trust Hub: pass; Socket: pass; Snyk: pass
Origin: Converted from a Cursor rules file, per the repo README
Assumed stack: FastAPI, Pydantic v2, asyncpg or aiomysql, SQLAlchemy 2.0

What it includes

Concise, functional, modular code with RORO
Favor functional programming, descriptive names with auxiliary verbs, lowercase file names and the Receive an Object, Return an Object pattern.
Key principles
def versus async def, type hints and file structure
Use def for pure functions and async def for asynchronous work, type hints everywhere and Pydantic models over raw dicts. Structure: router, sub-routes, utilities, static content, types.
Python and FastAPI standards
Guard clauses, early returns and HTTPException
Handle edge cases at function entry, put the happy path last and use HTTPException for expected errors.
Error handling
Lifespan handlers, middleware, declared return types
Prefer lifespan context managers for startup and shutdown, middleware for logging and monitoring and clear return type annotations.
FastAPI guidelines
Async I/O, caching and lazy loading
Minimize blocking I/O, cache with Redis or in memory, optimize Pydantic serialization and lazy-load large datasets.
Performance
Dependency injection and the assumed stack
Rely on FastAPI dependency injection. The dependencies list is FastAPI, Pydantic v2, asyncpg or aiomysql and SQLAlchemy 2.0.
Key conventions and dependencies

From the official docs

Questions

What does the fastapi-python skill do?

It tells Claude to write FastAPI code in a specific style: functional, typed, async, with Pydantic models and guard-clause error handling. It is a coding style guide.

How do I install it?

Use the install box above. The repo README shows the pattern npx skills add Mindrally/skills --skill followed by the skill name.

Does it install FastAPI or create a project?

No. It lists FastAPI, Pydantic v2, asyncpg or aiomysql and SQLAlchemy 2.0 as its dependencies. The skill is one SKILL.md with no scripts, so installing the packages and creating the project are up to you or to Claude when you ask.

Does it work with databases other than Postgres or MySQL?

The skill names asyncpg and aiomysql and SQLAlchemy 2.0, and says to use async for database calls. It does not say anything about other databases.

Where does it come from?

The Mindrally skills repo says its skills were converted from Cursor rules into the SKILL.md format, and that Mindrally maintains them.

Is it safe?

It bundles no scripts and only holds a ruleset. Claude writes code in your project as it would normally, so review the code like any other.

Information

updated Nov 2, 2026

Repository: mindrally/skills
Folder: fastapi-python

mindrally/skills skills.sh

Sources

Docs, issue trackers and discussions this page is built from.

Show all 2

fastapi-python SKILL.md · github.com
Mindrally/skills README · github.com