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Python/FastAPI coding standards including async patterns, Pydantic v2, SQLAlchemy 2.0, and project structure. Use when writing Python code, reviewing FastAPI projects, or learning FastAPI conventions.
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SOC 職業分類に基づく
Generate complete service-level Terraform infrastructure with modules, environments, and CI/CD. Use when adding Terraform to a new service or bootstrapping infrastructure from scratch.
Audit JS/TS projects against NPM Security Guidelines covering project setup, dependency hygiene, CI/CD pipeline, Dependabot, and incident response. Use when reviewing package.json or lockfiles, adding or upgrading npm dependencies, setting up CI security gates, hardening a new repo, or responding to a compromised package.
Creates FastAPI endpoints with layered architecture (Router → Service → Repository). Use when creating new API endpoints, CRUD operations, or scaffolding a new domain module in a FastAPI project.
Testing patterns for FastAPI with pytest-asyncio, httpx AsyncClient, fixtures, and test data factories. Use when writing tests, setting up test infrastructure, or improving coverage in a FastAPI project.
Investigate a monitoring alert end-to-end. Pulls metrics, logs, traces, and recent code changes to identify root cause. Works with any monitoring MCP.
Create a structured on-call log by pulling alerts from monitoring and writing a summary to your team's wiki. Requires a monitoring MCP (recommended: Datadog) and a wiki MCP (Confluence or Notion).
| name | python-best-practices |
| description | Python/FastAPI coding standards including async patterns, Pydantic v2, SQLAlchemy 2.0, and project structure. Use when writing Python code, reviewing FastAPI projects, or learning FastAPI conventions. |
| allowed_tools | ["Read","Write","Edit","Glob","Grep"] |
Router → Service → Repository → Database. Each layer only calls the one below it.
See code-patterns.md for full project structure and layer examples.
Separate Create/Update/Response schemas. Use ConfigDict(from_attributes=True) for ORM integration. Use str | None syntax (not Optional[str]).
See code-patterns.md for schema examples.
async def for I/O routes, plain def for CPU-bound. Use lifespan context manager (not on_event). Use httpx.AsyncClient for external HTTP calls.
See code-patterns.md for async examples.
Use a SoftDeleteMixin on SQLAlchemy models. Filter where(Model.deleted_at.is_(None)) in all queries.
See code-patterns.md for mixin and repository patterns.
Use pydantic-settings for all config. Never hardcode secrets, URLs, or magic numbers.
See code-patterns.md for Settings class pattern.
Use a generic PaginatedResponse[T] for all list endpoints. Always return total, page, limit, has_more.
See code-patterns.md for the pattern.
async def vs def matters for performance. An async def route that calls blocking code (like time.sleep() or sync DB drivers) blocks the entire event loop. Use plain def for CPU-bound work — FastAPI runs it in a threadpool. Use async def only when you await something.
datetime.utcnow() is deprecated since Python 3.12. Use datetime.now(UTC) instead. The old function returns a naive datetime (no timezone), which causes comparison bugs. The new one returns timezone-aware UTC.
Mutable default arguments in Pydantic look safe but have a catch. tags: list[str] = [] works in Pydantic (it copies the default). But tags: list[str] = Field(default_factory=list) is explicit and safer for nested models. For simple fields, either works. For complex nested defaults, always use default_factory.
from_attributes=True replaces orm_mode=True. Pydantic v2 changed the config API. Using the old orm_mode silently does nothing — your ORM objects won't serialize correctly.
SQLAlchemy Column() is legacy. Use Mapped[type] with mapped_column() for SQLAlchemy 2.0. The old Column(String) still works but loses type checker support and IDE autocomplete.
