Aspnet Core

What it does

When your agent uses it

• : working on ASP.NET Core apps
• Deployment behavior
• Deciding between ASP.NET Core sub-stacks
• : unrelated stacks

Example prompts

• “/aspnet-core”

Requirements

• Compatibility (from SKILL.md): Requires an ASP.NET Core project or solution.

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

1. 1Detect the real hosting shape first
2. 2Follow the correct middleware order
3. 3Use built-in patterns correctly
4. 4Route specialized work to specific skills
5. 5Validate with build, tests, and targeted endpoint checks.

What it can do on your machine

Read from SKILL.md and the folder at commit 535dd55. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are csharp).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  Links to these hosts (documentation or services it may open):

  • learn.microsoft.com

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

• Compatibility

  Requires an ASP.NET Core project or solution.

  From compatibility in the SKILL.md frontmatter.

Context cost

Aspnet Core loads about 2.1k tokens when it runs, and up to ~16k if it reads all its reference files. Until then it costs about 148 tokens; SKILL.md has 471 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~148

When it runs · the whole SKILL.md, loaded when a task matches

~2.1k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~16k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from managedcode/dotnet-skills at commit 535dd55, republished under its MIT licence (© managedcode). 471 words, ~2,083 tokens.

name

aspnet-core

description

Build, debug, modernize, or review ASP.NET Core applications with correct hosting, middleware, security, configuration, logging, and deployment patterns on current .NET. USE FOR: working on ASP.NET Core apps, services, or middleware; changing auth, routing, configuration, hosting, or deployment behavior; deciding between ASP.NET Core sub-stacks. DO NOT USE FOR: unrelated stacks; generic tasks that do not need this specific guidance. INVOKES: inspect the repository context, edit targeted files, and run relevant build, test, lint, or validation commands when changes are made.

compatibility

Requires an ASP.NET Core project or solution.

var app = builder.Build();

app.UseExceptionHandler("/error");      // 1. Catch all exceptions
app.UseHsts();                          // 2. Security headers
app.UseHttpsRedirection();              // 3. HTTPS redirect
app.UseStaticFiles();                   // 4. Serve static files
app.UseRouting();                       // 5. Route matching
app.UseCors();                          // 6. CORS policy
app.UseAuthentication();                // 7. Who are you?
app.UseAuthorization();                 // 8. Can you access?
app.UseRateLimiter();                   // 9. Rate limiting
app.UseResponseCaching();               // 10. Response cache
app.MapControllers();                   // 11. Endpoints

public class RequestTimingMiddleware
{
    private readonly RequestDelegate _next;
    private readonly ILogger<RequestTimingMiddleware> _logger;

    public RequestTimingMiddleware(RequestDelegate next, ILogger<RequestTimingMiddleware> logger)
    {
        _next = next;
        _logger = logger;
    }

    public async Task InvokeAsync(HttpContext context)
    {
        var sw = Stopwatch.StartNew();
        await _next(context);
        _logger.LogInformation("Request {Path} completed in {Elapsed}ms",
            context.Request.Path, sw.ElapsedMilliseconds);
    }
}

// appsettings.json
{
  "EmailSettings": {
    "SmtpServer": "smtp.example.com",
    "Port": 587
  }
}

// Registration
builder.Services.Configure<EmailSettings>(
    builder.Configuration.GetSection("EmailSettings"));

// Usage
public class EmailService(IOptions<EmailSettings> options)
{
    private readonly EmailSettings _settings = options.Value;
}

builder.Configuration
    .AddJsonFile("appsettings.json", optional: false)
    .AddJsonFile($"appsettings.{builder.Environment.EnvironmentName}.json", optional: true)
    .AddEnvironmentVariables()
    .AddUserSecrets<Program>(optional: true);

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters = new TokenValidationParameters
        {
            ValidateIssuer = true,
            ValidateAudience = true,
            ValidateLifetime = true,
            ValidateIssuerSigningKey = true,
            ValidIssuer = builder.Configuration["Jwt:Issuer"],
            ValidAudience = builder.Configuration["Jwt:Audience"],
            IssuerSigningKey = new SymmetricSecurityKey(
                Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"]!))
        };
    });

builder.Services.AddAuthorization(options =>
{
    options.AddPolicy("AdminOnly", policy =>
        policy.RequireRole("Admin"));
    options.AddPolicy("MinAge18", policy =>
        policy.RequireClaim("Age", "18", "19", "20")); // simplified
});

© managedcode, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in catalog/Frameworks/ASP.NET-Core/skills/aspnet-core of managedcode/dotnet-skills.

• SKILL.md
• manifest.json
• references/anti-patterns.md
• references/patterns.md

Open the folder on GitHubat commit 535dd55