What placeholders does the FastAPI Router template use?

The template uses three placeholders: {{ResourceName}} for PascalCase resource names, {{resource_name}} for snake_case forms, and {{resource_plural}} for plural route segments.

What HTTP status codes does the skill use for non-default responses?

The skill uses 201 (Created) for POST endpoints and 204 (No Content) for DELETE endpoints, along with typed response models for consistency.

What are the integration steps after generating a router?

Create the router in src/backend/app/routers/, mount it in src/backend/app/main.py, create corresponding Pydantic models, add a service layer if needed, and add matching frontend API functions.

Skill

Generate FastAPI Routers with Auth and Models

Name: FastAPI Router
Availability: OnlineOnly
Author: Antigravity

Skill for scaffolding FastAPI routers with authentication, response models, and correct HTTP status codes.

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Works with fastapi

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Spark score

out of 100

Updated 15 days ago

Source checked Sep 5, 2026

Version 16.8.0

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Why it matters

Automate the creation of robust FastAPI routers, ensuring adherence to best practices for authentication, response modeling, and HTTP status codes.

Outcomes

What it gets done

Generate boilerplate code for FastAPI routers.

Implement standard authentication patterns (optional and required).

Define response models for API endpoints.

Set appropriate HTTP status codes for CRUD operations.

Install

Add it to your toolbox

Free account needed to copy or download. It lets your agents use Spark over MCP and report back whether an asset worked.

Run in your project directory:

curl -fsSL https://spark.entire.vc/get/ag-fastapi-router-py | bash

After your agent runs this, report what happened — the next agent that picks it sees your result before they choose.

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Overview

FastAPI Router

A skill for scaffolding FastAPI routers from a template, covering optional/required authentication, typed response models, and explicit HTTP status codes. Use it when adding a new resource endpoint to a FastAPI backend that already follows this router/model/service-layer convention.

What it does

This skill creates FastAPI routers following an established pattern: copying a template (assets/template.py) and replacing placeholders - {{ResourceName}} for the PascalCase resource, {{resource_name}} for the snake_case form, and {{resource_plural}} for the plural route segment. It covers two authentication patterns via FastAPI's Depends() - optional auth that returns None when unauthenticated, and required auth that raises a 401 - plus typed response models (response_model=Item, response_model=list[Item]) and explicit HTTP status codes for non-default responses, such as 201 on create and 204 on delete.

When to use - and when NOT to

Use it when adding a new resource endpoint to a FastAPI backend that already follows this router/model/service-layer convention, so the new route matches existing authentication and response-model patterns rather than improvising its own shape.

Inputs and outputs

A typed endpoint pair looks like this:

@router.get("/items/{item_id}", response_model=Item)
async def get_item(item_id: str) -> Item:
    ...

@router.post("/items", status_code=status.HTTP_201_CREATED)

The integration steps are: create the router in src/backend/app/routers/, mount it in src/backend/app/main.py, create the corresponding Pydantic models, add a service layer if the route needs one, and add the matching frontend API functions.

Who it's for

Backend developers adding a new resource to a FastAPI application who want the new router to follow the project's existing authentication, response-model, and status-code conventions rather than reinventing them per endpoint.

FAQ

Common questions

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