aspnet-core
by openaiThe aspnet-core skill helps you build, review, refactor, and upgrade ASP.NET Core apps using current framework guidance. It is built for backend development, APIs, server-rendered apps, Blazor, SignalR, gRPC, and hosted services, with decision-first guidance for app model choice, Program.cs setup, DI, configuration, security, testing, and deployment.
This skill scores 86/100, which means it is a solid directory listing for users who want a structured ASP.NET Core workflow instead of relying on a generic prompt. The repo provides a clear trigger, a compact operating sequence, and a large set of official-reference-backed guidance files that help agents choose the right app model and cross-cutting docs with less guesswork.
- Strong triggerability: the frontmatter explicitly scopes the skill to building, reviewing, refactoring, and architecting ASP.NET Core web apps across common tasks like Blazor, MVC, Minimal APIs, SignalR, gRPC, auth, testing, and upgrades.
- Good operational clarity: the SKILL.md workflow tells the agent which reference to open first, which primary app-model doc to choose, and how to keep the reference set minimal.
- High practical coverage: 13 reference files cover stack selection, Program.cs/pipeline, UI styles, APIs, security/identity, data/services, realtime/background work, testing/operations, and upgrades.
- The install surface is documentation-heavy rather than automated: there is no install command in SKILL.md and no scripts, so execution quality depends on the agent following the written workflow.
- The repo is broad but still depends on choosing the correct app model up front; wrong initial classification could lead to using the wrong primary reference.
Overview of aspnet-core skill
The aspnet-core skill helps you build and revise ASP.NET Core apps with current framework guidance instead of generic web-app advice. It is best for developers and agents working on backend services, APIs, server-rendered apps, Blazor, real-time features, or upgrades who need to choose the right app model, wire Program.cs correctly, and avoid framework-mismatch mistakes.
What makes the aspnet-core skill useful is its decision-first structure: it does not just explain ASP.NET Core concepts, it points you to the smallest set of references for the job. That matters when you are deciding between Minimal APIs, controllers, MVC, Razor Pages, Blazor, SignalR, or gRPC, or when you need a clean path through DI, configuration, security, testing, and deployment.
Best fit for Backend Development
Use the aspnet-core skill for Backend Development when you need to:
- start a new ASP.NET Core service with a sane default stack
- refactor an existing app without rewriting everything
- fix
Program.cs, middleware order, routing, or service registration - choose between minimal and controller-based APIs
- add identity, EF Core, hosted services, or performance features in the framework style Microsoft documents today
What it optimizes for
The aspnet-core skill is strongest when the goal is practical execution:
- fewer wrong defaults
- less guesswork on app-model selection
- tighter prompts for code changes
- better reference targeting for complex features
It is less about theory and more about making the next implementation step obvious.
When it is not the right tool
If your task is only high-level ASP.NET Core brainstorming, or you already have a very constrained snippet-level fix, a normal prompt may be enough. The aspnet-core skill is most valuable when architecture, host setup, or framework conventions affect the result.
How to Use aspnet-core skill
Install and open the right files
For aspnet-core install, use:
npx skills add openai/skills --skill aspnet-core
Then read the skill entry point first, not every reference at once:
SKILL.mdfor the workflow and decision rulesreferences/_sections.mdfor the routing mapreferences/stack-selection.mdfor new apps or major redesignsreferences/program-and-pipeline.mdfor host setup, DI, middleware, and config
Give the skill the right input
The aspnet-core usage pattern works best when your prompt includes:
- target .NET version and SDK
- current app model, if one already exists
- the change type: new app, feature work, refactor, or upgrade
- whether the app is API-first, UI-first, or mixed
- any constraints: auth scheme, database, hosting model, or deployment target
Stronger prompt:
Update this .NET 9 ASP.NET Core Minimal API to add authenticated
POST /orders, use EF Core, keep handlers thin, and preserve existing route groups.
Weaker prompt:
Improve my ASP.NET Core app.
Use the smallest matching reference set
A practical aspnet-core guide workflow is:
- decide the app model first
- inspect
Program.csand pipeline setup - open one primary app-model reference only
- add cross-cutting references only when needed
Helpful reference paths:
- APIs:
references/apis-minimal-and-controllers.md - Blazor:
references/ui-blazor.md - MVC:
references/ui-mvc.md - Razor Pages:
references/ui-razor-pages.md - Data and services:
references/data-state-and-services.md - Security:
references/security-and-identity.md - Upgrades:
references/versioning-and-upgrades.md
Watch the output-shaping details
The skill is most effective when you ask for implementation decisions, not just code. Specify things like:
- whether to prefer Minimal APIs or controllers
- whether business logic should move into services
- whether the task should preserve an existing pattern or migrate to a better one
- whether tests, auth, or deployment notes are required
That helps the aspnet-core skill produce code that fits the repository instead of a generic template.
aspnet-core skill FAQ
Is aspnet-core skill only for new projects?
No. It is also useful for existing apps that need feature work, cleanup, or migration support. In many cases, the strongest use is improving an app without changing its overall structure.
How is it different from a normal prompt?
A normal prompt can generate ASP.NET Core code, but the aspnet-core skill gives you a curated path through framework choices and references. That reduces common failures like mixing API styles, placing logic in the wrong layer, or misordering startup middleware.
Is aspnet-core install worth it for beginners?
Yes, if you want a guided path through ASP.NET Core basics. It is especially helpful when you do not yet know which reference to open first or how Program.cs connects to services, middleware, and endpoints.
When should I not use aspnet-core?
Do not use it if the task is unrelated to ASP.NET Core, or if you only need a one-off code snippet with no concern for app structure. It is designed for real app work, not generic web advice.
How to Improve aspnet-core skill
Start with the actual app shape
The best aspnet-core skill results come from naming the app model and the current state. Say whether the codebase is MVC, Razor Pages, Blazor, Minimal APIs, or controllers, and say whether you are preserving or changing that choice.
Give constraints that change implementation
Add the details that affect framework decisions:
- authentication method
- database and EF Core usage
- hosting target
- real-time or background processing needs
- upgrade target version
For example, “convert this controller API to Minimal APIs while keeping OpenAPI and auth policies” is much more actionable than “modernize this API.”
Ask for decisions, not just edits
If you want the aspnet-core guide to produce higher-value output, request the tradeoff explicitly:
- “choose the smallest viable app-model change”
- “keep middleware order correct”
- “move business logic into services”
- “prefer framework defaults over custom plumbing where possible”
Review the first pass against the repo
After the first result, compare it with the repository’s existing patterns and the relevant references. If the output feels off, refine the prompt with the exact mismatch: startup shape, route style, service lifetime, auth boundary, or upgrade target.