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aspnet-minimal-api-openapi

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Create ASP.NET Minimal API endpoints with proper OpenAPI documentation

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/aspnet-minimal-api-openapi/SKILL.md

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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