# ASP.NET Core Guidance

Builds and reviews ASP.NET Core apps following current official guidance.

- Repository: https://github.com/openai/skills (28445 stars)
- Category: Engineering
- License: see repository
- Last updated: 2026-10-28
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add openai/skills --skill aspnet-core -g -a claude-code -y`
Codex: `npx skills add openai/skills --skill aspnet-core -g -a codex -y`
Cursor: `npx skills add openai/skills --skill aspnet-core -g -a cursor -y`
Gemini CLI: `npx skills add openai/skills --skill aspnet-core -g -a gemini-cli -y`

## Description

Build, review, refactor, or architect ASP.NET Core web applications using current official guidance for .NET web development. Use when working on Blazor Web Apps, Razor Pages, MVC, Minimal APIs, controller-based Web APIs, SignalR, gRPC, middleware, dependency injection, configuration, authentication, authorization, testing, performance, deployment, or ASP.NET Core upgrades.

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# ASP.NET Core

## Overview

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.

Load the smallest set of references that fits the task. Do not load every reference by default.

## Workflow

1. Confirm the target framework, SDK, and current app model.
2. Open [references/stack-selection.md](references/stack-selection.md) first for new apps or major refactors.
3. Open [references/program-and-pipeline.md](references/program-and-pipeline.md) next for `Program.cs`, DI, configuration, middleware, routing, logging, and static assets.
4. Open exactly one primary app-model reference:
   - [references/ui-blazor.md](references/ui-blazor.md)
   - [references/ui-razor-pages.md](references/ui-razor-pages.md)
   - [references/ui-mvc.md](references/ui-mvc.md)
   - [references/apis-minimal-and-controllers.md](references/apis-minimal-and-controllers.md)
5. Add cross-cutting references only as needed:
   - [references/data-state-and-services.md](references/data-state-and-services.md)
   - [references/security-and-identity.md](references/security-and-identity.md)
   - [references/realtime-grpc-and-background-work.md](references/realtime-grpc-and-background-work.md)
   - [references/testing-performance-and-operations.md](references/testing-performance-and-operations.md)
6. Open [references/versioning-and-upgrades.md](references/versioning-and-upgrades.md) before introducing new platform APIs into an older solution or when migrating between major versions.
7. Use [references/source-map.md](references/source-map.md) when you need the Microsoft Learn section that corresponds to a task not already covered by the focused references.

## Default Operating Assumptions

The rest: https://github.com/openai/skills/blob/HEAD/skills/.curated/aspnet-core/SKILL.md