# Aspnet Minimal API Openapi

> Create ASP.NET Minimal API endpoints with proper OpenAPI documentation

- Skill: `thedixitjain/aspnet-minimal-api-openapi` (Agent Skill)
- Install (CLI): `npx skillmds add thedixitjain/aspnet-minimal-api-openapi`
- Raw SKILL.md: https://api.skillmd.com/api/skills/thedixitjain/aspnet-minimal-api-openapi/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Docs & Writing
- Author: thedixitjain (https://skillmd.com/u/thedixitjain)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/thedixitjain/aspnet-minimal-api-openapi

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# ASP.NET Minimal API with OpenAPI

Your goal is to help me create well-structured ASP.NET Minimal API endpoints with correct types and comprehensive OpenAPI/Swagger documentation.

## API Organization

- Group related endpoints using `MapGroup()` extension
- Use endpoint filters for cross-cutting concerns
- Structure larger APIs with separate endpoint classes
- Consider using a feature-based folder structure for complex APIs

## Request and Response Types

- Define explicit request and response DTOs/models
- Create clear model classes with proper validation attributes
- Use record types for immutable request/response objects
- Use meaningful property names that align with API design standards
- Apply `[Required]` and other validation attributes to enforce constraints
- Use the ProblemDetailsService and StatusCodePages to get standard error responses

## Type Handling

- Use strongly-typed route parameters with explicit type binding
- Use `Results<T1, T2>` to represent multiple response types
- Return `TypedResults` instead of `Results` for strongly-typed responses
- Leverage C# 10+ features like nullable annotations and init-only properties

## OpenAPI Documentation

- Use the built-in OpenAPI document support added in .NET 9
- Define operation summary and description
- Add operationIds using the `WithName` extension method
- Add descriptions to properties and parameters with `[Description()]`
- Set proper content types for requests and responses
- Use document transformers to add elements like servers, tags, and security schemes
- Use schema transformers to apply customizations to OpenAPI schemas

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**Source:** [`github/awesome-copilot`](https://github.com/github/awesome-copilot) → `skills/aspnet-minimal-api-openapi/SKILL.md`