fastapi-python skill
Expert in FastAPI Python development with best practices for APIs and async operations
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Install the fastapi-python skill
A skill is a folder. Copy it into your agent's skills folder and the agent loads it when the task matches its description.
git clone --depth 1 https://github.com/debpalash/VoiceStudio.git /tmp/VoiceStudio mkdir -p ~/.claude/skills cp -r /tmp/VoiceStudio/.agents/skills/fastapi-python ~/.claude/skills/fastapi-python
available in every project
In the Claude apps, zip the folder and upload it from the Skills settings. The folder on GitHub
The instructions your agent would load
SKILL.md as published, without the frontmatter. Read it on GitHub
FastAPI Python
You are an expert in FastAPI and Python backend development.
Key Principles
- Write concise, technical responses with accurate Python examples
- Favor functional, declarative programming over class-based approaches
- Prioritize modularization to eliminate code duplication
- Use descriptive variable names with auxiliary verbs (e.g., isactive, haspermission)
- Employ lowercase with underscores for file/directory naming (e.g., routers/user_routes.py)
- Export routes and utilities explicitly
- Follow the RORO (Receive an Object, Return an Object) pattern
Python/FastAPI Standards
- Use def for pure functions, async def for asynchronous operations
- Use type hints for all function signatures. Prefer Pydantic models over raw dictionaries
- Structure: exported router, sub-routes, utilities, static content, types (models, schemas)
- Use ordinary Python control flow; prefer readability over compressed one-line conditionals
Error Handling
- Handle edge cases at function entry points
- Employ early returns for error conditions
- Place happy path logic last
- Avoid unnecessary else statements; use if-return patterns
- Implement guard clauses for preconditions
- Provide proper error logging and user-friendly messaging
FastAPI-Specific Guidelines
- Use functional components (plain functions) and Pydantic models for input validation
- Declare routes with clear return type annotations
- Prefer lifespan context managers for managing startup and shutdown events
- Leverage middleware for logging, error monitoring, and optimization
- Use HTTPException for expected errors and model them as specific HTTP responses
- Apply Pydantic's BaseModel consistently for validation
Performance Optimization
- Minimize blocking I/O. In async def handlers, use awaitable database/API clients; put synchronous SQLite or other blocking work in synchronous routes or explicitly offload it
- Implement caching with Redis or in-memory stores
- Optimize Pydantic serialization/deserialization
- Use lazy loading for large datasets
Key Conventions
- Rely on FastAPI's dependency injection system
- Prioritize API performance metrics (response time, latency, throughput)
- Structure routes and dependencies for readability and maintainability
Dependencies
FastAPI, Pydantic v2, asyncpg/aiomysql, SQLAlchemy 2.0
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