llms.txt is an open proposal for a short Markdown file that lists a project's key docs and links, so AI tools can find them without crawling every page.

Where should llms.txt be deployed?

At /llms.txt on your documentation site, or in your repository root. Tools read it when they fetch it; nothing loads it automatically.

# .NET 10 & C# 14 Minimal APIs Specialist

> Production guidelines for .NET 10 (LTS) and C# 14. Enforces Minimal APIs, primary constructors, collection expressions, file-scoped namespaces, and EF Core 10 query optimization.

## Quick Reference

- **Framework**: ASP.NET Core 10 Minimal APIs

- **Language**: C# 14 (.NET 10 SDK)

- **Styling & UI**: None / API Service

- **Database / Persistence**: PostgreSQL / SQL Server / EF Core 10

- **Architectural Philosophy**: modern

## Core Architectural Invariants

- **Clean Layered Architecture**: Decouple presentation, business logic, and data access layers via interfaces.

- **Guard Clauses & Early Returns**: Exit early from functions to eliminate deeply nested if-else pyramids.

- **Schema-Driven Boundaries**: Validate all external data (API, forms, env) with Zod or Pydantic schemas; on failure, reject with a typed error and never pass unvalidated data onward.

## Operational Guardrails & Prohibited Patterns

- **Inspect Before Acting**: Always read and understand existing code and imports before suggesting changes.

- **Minimal Surgical Diffs**: Touch only lines relevant to prompt. Preserve existing comments and formatting.

- **Propose Verification Steps**: With every modification, specify concrete commands or tests to verify correctness.

## Mandatory Project Directives

- Enable '#nullable enable' across all C# project files.

- Return explicit IResult types (TypedResults.Ok, TypedResults.NotFound) rather than untyped object responses.

## Implementation Reference

### Preferred Patterns

```ts

namespace App.Features.Users;

using Microsoft.AspNetCore.Http.HttpResults;

using Microsoft.EntityFrameworkCore;

public record UserDto(Guid Id, string Email, string FullName);

public static class UserEndpoints

{

public static RouteGroupBuilder MapUserEndpoints(this RouteGroupBuilder group)

{

group.MapGet("/{id:guid}", async Task<Results<Ok<UserDto>, NotFound>> (Guid id, AppDbContext db) =>

{

var user = await db.Users

.AsNoTracking()

.Where(u => u.Id == id)

.Select(u => new UserDto(u.Id, u.Email, u.FullName))

.FirstOrDefaultAsync();

return user is not null ? TypedResults.Ok(user) : TypedResults.NotFound();

});

return group;

}

```

### Discouraged Anti-Patterns

```ts

namespace App.Controllers

{

public class UsersController : Controller

{

[HttpGet]

public IActionResult GetUser(Guid id)

{

var user = _context.Users.Find(id); // Untracked query loading full entity graph into tracker

return Ok(user);

}

```

## Verification Commands & Workflows

1. Use current C# features where they make code clearer: primary constructors, collection expressions, file-scoped namespaces, and C# 14's field keyword, extension members and null-conditional assignment (customer?.Order = ...).

2. Structure high-performance microservices using ASP.NET Core Minimal APIs with TypedResults.

3. Enforce AsNoTracking() on read-only EF Core queries to eliminate change tracking memory overhead.

4. Validate incoming request payloads with FluentValidation or MiniValidation before executing queries.

5. Configure resilient outgoing HTTP requests via IHttpClientFactory and Polly pipelines.

## Context Documents & Specs

- [System Architecture](ARCHITECTURE.md): Authoritative system design, data flows, and state machine invariants.

- [AI Multi-Agent Spec](AGENTS.md): Universal specification for autonomous coding agent operations.

Backend · Any LLM tool that fetches it

.NET 10 & C# 14 Minimal APIs llms.txt

An llms.txt for a .NET 10 & C# 14 Minimal APIs project: a short Markdown map of what it is and where the key docs and code live.

Path: llms.txt
Loads: Fetched on request
Format: Markdown index (.txt)
Used by: Any LLM tool that fetches it

All llms.txt presets and how llms.txt works

What this file tells the agent

An llms.txt gives language models and agents a short Markdown map of your .NET 10 & C# 14 Minimal APIs project: what it is and where the key docs and code live, so a tool that fetches it can go straight to the right files.

Use current C# features: primary constructors, collection expressions, file-scoped namespaces, C# 14's field keyword, and nullable reference types (#nullable enable).
Structure lightweight microservices with ASP.NET Core Minimal APIs using typed route groups and TypedResults return values.
Enforce AsNoTracking() on read-only EF Core queries to eliminate memory overhead from change trackers.
Validate request payloads using FluentValidation or MiniValidation before executing business logic.
Use IHttpClientFactory with typed resilience pipelines (Polly) for outbound HTTP calls.

Code to avoid, and what to write instead

The rule steers the agent away from the left and toward the right.

avoid

// Discouraged: Nested namespaces, missing AsNoTracking, untyped object returns
namespace App.Controllers
{
    public class UsersController : Controller
    {
        [HttpGet]
        public IActionResult GetUser(Guid id)
        {
            var user = _context.Users.Find(id); // Untracked query tracking all state!
            return Ok(user);
        }
    }
}

write instead

namespace App.Features.Users;

using Microsoft.AspNetCore.Http.HttpResults;
using Microsoft.EntityFrameworkCore;

public record CreateUserRequest(string Email, string FullName);
public record UserDto(Guid Id, string Email, string FullName);

public static class UserEndpoints
{
    public static RouteGroupBuilder MapUserEndpoints(this RouteGroupBuilder group)
    {
        group.MapGet("/{id:guid}", async Task<Results<Ok<UserDto>, NotFound>> (Guid id, AppDbContext db) =>
        {
            var user = await db.Users
                .AsNoTracking()
                .Where(u => u.Id == id)
                .Select(u => new UserDto(u.Id, u.Email, u.FullName))
                .FirstOrDefaultAsync();

            return user is not null ? TypedResults.Ok(user) : TypedResults.NotFound();
        });

        return group;
    }
}

Install it in one command

01
Go to your project root
The file goes at llms.txt, relative to the root.
02
Download the file
Run the command on the right. It downloads this preset and writes the file.
03
Make sure it gets used
Nothing loads llms.txt automatically. Serve it at your site root, or point agents to it from CLAUDE.md or AGENTS.md.

$ curl -fsSL "https://www.devscratchpad.tech/api/raw/llms-txt/csharp-dotnet-10" -o "llms.txt"

writes llms.txt

path

llms.txt

To write the file from your own code instead, use Read your code or Convert Legacy Rules in the editor above.

More for .NET 10 & C# 14 Minimal APIs

Other formats

Other llms.txt presets

Questions

What is llms.txt?: llms.txt is an open proposal for a short Markdown file that lists a project's key docs and links, so AI tools can find them without crawling every page.
Where should llms.txt be deployed?: At /llms.txt on your documentation site, or in your repository root. Tools read it when they fetch it; nothing loads it automatically.

Target Standard & File Format

Identity & Activation Rules

Technology Stack Context

Engineering Philosophy

Architectural & Code Quality Conventions

Agent Behavioral Guardrails

Step-by-Step Workflow Procedures

Target File Location