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Choose the right ASP.NET Core application model, compose the host and request pipeline correctly, and implement features in the framework style Microsoft documents today.

Guides creation and modification of ASP.NET Core Web API endpoints with correct HTTP semantics, OpenAPI metadata, and error handling. USE FOR: adding new API endpoints (controllers or minimal APIs), wiring up OpenAPI/Swagger, creating .http test files, setting up global error handling middleware. DO NOT USE FOR: general C# coding style, EF Core data access or query optimization (use optimizing-ef-core-queries), frontend/Blazor work, gRPC services, or SignalR hubs.

ASP.NET Minimal API endpoints with automatic OpenAPI/Swagger documentation and strong typing. \n \n Organize endpoints using MapGroup() , endpoint filters, and feature-based folder structures for scalability \n Define explicit request/response DTOs with validation attributes; use record types and TypedResults for type safety \n Leverage .NET 9 built-in OpenAPI support with operation summaries, descriptions, operationIds, and property-level documentation via [Description()] \n Apply document and

Configure OpenTelemetry distributed tracing, metrics, and logging in ASP.NET Core using the .NET OpenTelemetry SDK. Use when adding observability, setting up OTLP exporters, creating custom metrics/spans, or troubleshooting distributed trace correlation.

File upload endpoints in ASP.NET minimal APIs (.NET 8+)

Generate Dockerfile and configuration files to containerize an ASP.NET .NET Framework application for Windows containers. \n \n Detects .NET Framework version from project file and selects appropriate Windows Server base images (Core or Full, versions 2016–2022) \n Modifies web.config to enable environment variable configuration via ConfigurationBuilders for app settings and connection strings \n Creates multi-stage Dockerfile with separate build (SDK) and runtime (ASP.NET) stages, including Log

You are an expert in ASP.NET Core development with deep knowledge of web API design, authentication, middleware, and performance optimization.