openarg_backend: Command for Claude Code

Create new FastAPI endpoint: $ARGUMENTS

Add a new endpoint to the API. Follow these steps:

1. Create the router

Create src/app/presentation/http/controllers/{module}/{module}_router.py:

from fastapi import APIRouter
from dishka.integrations.fastapi import FromDishka, inject
from pydantic import BaseModel

router = APIRouter(prefix="/{module}", tags=["{module}"])

class {Module}Request(BaseModel):
    field: str

class {Module}Response(BaseModel):
    result: str

@router.post("/", response_model={Module}Response)
@inject
async def create_{module}(
    body: {Module}Request,
    service: FromDishka[IService],
) -> {Module}Response:
    result = await service.execute(body.field)
    return {Module}Response(result=result)

Reference: src/app/presentation/http/controllers/query/query_router.py (full example with DI, rate limiting, WebSocket), src/app/presentation/http/controllers/datasets/datasets_router.py (simple CRUD).

2. Add rate limiting (if needed)

from slowapi import Limiter
from slowapi.util import get_remote_address

limiter = Limiter(key_func=get_remote_address)

@router.post("/")
@limiter.limit("10/minute")
async def endpoint(request: Request, ...):
    ...

3. Define Pydantic schemas

Request/response models go in the same router file or a separate schemas.py if complex.

Conventions:

• Request: {Name}Request
• Response: {Name}Response
• Use Field() with descriptions for OpenAPI documentation

4. Register in the root router

Edit src/app/presentation/http/controllers/root_router.py:

from .{module}.{module}_router import router as {module}_router

api_router.include_router({module}_router)

This mounts it under /api/v1/{module}/.

5. Inject dependencies

If the endpoint needs services/repos, make sure they're registered in Dishka (src/app/setup/ioc/provider_registry.py) and use FromDishka[InterfaceType] + @inject decorator.

Checklist

• Router created with endpoint(s)
• Pydantic schemas defined
• Rate limiting configured if public-facing
• Registered in root_router.py
• Dependencies available in Dishka
• Tested: endpoint responds correctly