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Agent skill

Abp Application Layer

by abpframework in abpframework/abp

ABP Application Services, DTOs, CRUD service, object mapping (Mapperly/AutoMapper), validation, error handling.

LGPL-3.0Auto-check passedDevelopment

Install Abp Application Layer

skills CLI
$ npx skills add abpframework/abp --skill abp-application-layer -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install abpframework/abp abp-application-layer --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/abpframework/abp.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/abp-application-layer .claude/skills/abp-application-layer && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
abp-application-layer
GitHub stars
14k
Token cost
~2k tokens
SKILL.md length
443 words
Files
1
Skills in repo
18
Repo updated
First seen
Licence
LGPL-3.0

At a glance

ABP Application Services, DTOs, CRUD service, object mapping (Mapperly/AutoMapper), validation, error handling.

  • Reviewing application services
  • SKILL.md covers Anti-Patterns to Avoid, Application Service Structure, Application Service Best… and DTO Naming Conventions, plus 5 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
  • Working in the Application

What it does

Abp Application Layer is an agent skill from abpframework/abp. ABP Application Services, DTOs, CRUD service, object mapping (Mapperly/AutoMapper), validation, error handling. Use when creating or reviewing application services, DTOs, or working in the Application or Application.Contracts projects.

Its SKILL.md is about 2k tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.

It sits in Development. The repository describes itself as: Open-source web application framework for ASP.NET Core! Offers an opinionated architecture to build enterprise software solutions with best practices on top of the .NET. Provides… The licence is LGPL-3.0.

When your agent uses it

  • Reviewing application services
  • Working in the Application
  • Application.Contracts projects

Example prompts

  • “/abp-application-layer”

What it can do on your machine

Read from SKILL.md and the folder at commit 329eaa8. 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):

    • abp.io

    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.

Context cost

Abp Application Layer loads about 2k tokens when it runs. Until then it costs about 64 tokens; SKILL.md has 443 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~64
When it runs · the whole SKILL.md, loaded when a task matches
~2k

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

Auto-check passed

The automated check found no risky patterns in SKILL.md.

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 abpframework/abp at commit 329eaa8, republished under its LGPL-3.0 licence (© abpframework). 443 words, ~1,955 tokens.

Download SKILL.mdSave it as .claude/skills/abp-application-layer/SKILL.md (or your agent's skills folder).
name
abp-application-layer
description
ABP Application Services, DTOs, CRUD service, object mapping (Mapperly/AutoMapper), validation, error handling. Use when creating or reviewing application services, DTOs, or working in the Application or Application.Contracts projects.

ABP Application Layer Patterns

Docs: https://abp.io/docs/latest/framework/architecture/domain-driven-design/application-services

Anti-Patterns to Avoid

  • Entity name in method: use GetAsync not GetBookAsync
  • ID inside UpdateDto: pass id as a separate parameter, not inside the DTO
  • Calling other app services in the same module: use domain services or repositories directly
  • Using IFormFile/Stream in app service: accept byte[] from controllers instead
  • Business logic in app service: put it in domain entities or domain services

Application Service Structure

Interface (Application.Contracts)
csharp
public interface IBookAppService : IApplicationService
{
    Task<BookDto> GetAsync(Guid id);
    Task<PagedResultDto<BookListItemDto>> GetListAsync(GetBookListInput input);
    Task<BookDto> CreateAsync(CreateBookDto input);
    Task<BookDto> UpdateAsync(Guid id, UpdateBookDto input);
    Task DeleteAsync(Guid id);
}
Implementation (Application)
csharp
public class BookAppService : ApplicationService, IBookAppService
{
    private readonly IBookRepository _bookRepository;
    private readonly BookManager _bookManager;
    private readonly BookMapper _bookMapper;

    public BookAppService(
        IBookRepository bookRepository,
        BookManager bookManager,
        BookMapper bookMapper)
    {
        _bookRepository = bookRepository;
        _bookManager = bookManager;
        _bookMapper = bookMapper;
    }

    public async Task<BookDto> GetAsync(Guid id)
    {
        var book = await _bookRepository.GetAsync(id);
        return _bookMapper.MapToDto(book);
    }

    [Authorize(BookStorePermissions.Books.Create)]
    public async Task<BookDto> CreateAsync(CreateBookDto input)
    {
        var book = await _bookManager.CreateAsync(input.Name, input.Price);
        await _bookRepository.InsertAsync(book);
        return _bookMapper.MapToDto(book);
    }

    [Authorize(BookStorePermissions.Books.Edit)]
    public async Task<BookDto> UpdateAsync(Guid id, UpdateBookDto input)
    {
        var book = await _bookRepository.GetAsync(id);
        await _bookManager.ChangeNameAsync(book, input.Name);
        book.SetPrice(input.Price);
        await _bookRepository.UpdateAsync(book);
        return _bookMapper.MapToDto(book);
    }
}

Application Service Best Practices

  • Don't repeat entity name in method names (GetAsync not GetBookAsync)
  • Accept/return DTOs only, never entities
  • ID not inside UpdateDto - pass separately
  • Use custom repositories when you need custom queries, generic repository is fine for simple CRUD
  • Call UpdateAsync explicitly (don't assume change tracking)
  • Don't call other app services in same module
  • Don't use IFormFile/Stream - pass byte[] from controllers
  • Use base class properties (Clock, CurrentUser, GuidGenerator, L) instead of injecting these services

DTO Naming Conventions

PurposeConventionExample
Query inputGet{Entity}InputGetBookInput
List query inputGet{Entity}ListInputGetBookListInput
Create inputCreate{Entity}DtoCreateBookDto
Update inputUpdate{Entity}DtoUpdateBookDto
Single entity output{Entity}DtoBookDto
List item output{Entity}ListItemDtoBookListItemDto

DTO Location

  • Define DTOs in *.Application.Contracts project
  • This allows sharing with clients (Blazor, HttpApi.Client)

Validation

Data Annotations
csharp
public class CreateBookDto
{
    [Required]
    [StringLength(100, MinimumLength = 3)]
    public string Name { get; set; }

    [Range(0, 999.99)]
    public decimal Price { get; set; }
}
Custom Validation with IValidatableObject

Before adding custom validation, decide if it's a domain rule or application rule:

  • Domain rule: Put validation in entity constructor or domain service (enforces business invariants)
  • Application rule: Use DTO validation (input format, required fields)

Only use IValidatableObject for application-level validation that can't be expressed with data annotations:

csharp
public class CreateBookDto : IValidatableObject
{
    public string Name { get; set; }
    public string Description { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        if (Name == Description)
        {
            yield return new ValidationResult(
                "Name and Description cannot be the same!",
                new[] { nameof(Name), nameof(Description) }
            );
        }
    }
}
FluentValidation
csharp
public class CreateBookDtoValidator : AbstractValidator<CreateBookDto>
{
    public CreateBookDtoValidator()
    {
        RuleFor(x => x.Name).NotEmpty().Length(3, 100);
        RuleFor(x => x.Price).GreaterThan(0);
    }
}

Error Handling

Business Exceptions
csharp
throw new BusinessException("BookStore:010001")
    .WithData("BookName", name);
Entity Not Found
csharp
var book = await _bookRepository.FindAsync(id);
if (book == null)
{
    throw new EntityNotFoundException(typeof(Book), id);
}
User-Friendly Exceptions
csharp
throw new UserFriendlyException(L["BookNotAvailable"]);
Show full SKILL.md (182 more words)Show less
HTTP Status Code Mapping

Status code mapping is configurable in ABP (do not rely on a fixed mapping in business logic).

ExceptionTypical HTTP Status
AbpValidationException400
AbpAuthorizationException401/403
EntityNotFoundException404
BusinessException403 (but configurable)
Other exceptions500

Auto API Controllers

ABP automatically generates API controllers for application services:

  • Interface must inherit IApplicationService (which already has [RemoteService] attribute)
  • HTTP methods determined by method name prefix (Get, Create, Update, Delete)
  • Use [RemoteService(false)] to disable auto API generation for specific methods

Object Mapping (Mapperly / AutoMapper)

ABP supports both Mapperly and AutoMapper integrations. But the default mapping library is Mapperly. You need to first check the project's active mapping library.

  • Prefer the mapping provider already used in the solution (check existing mapping files / loaded modules).
  • In mixed solutions, explicitly setting the default provider may be required (see docs/en/release-info/migration-guides/AutoMapper-To-Mapperly.md).
Mapperly (compile-time)

Define mappers as partial classes:

csharp
[Mapper]
public partial class BookMapper
{
    public partial BookDto MapToDto(Book book);
    public partial List<BookDto> MapToDtoList(List<Book> books);
}

Register in module:

csharp
public override void ConfigureServices(ServiceConfigurationContext context)
{
    context.Services.AddSingleton<BookMapper>();
}

Usage in application service:

csharp
public class BookAppService : ApplicationService
{
    private readonly BookMapper _bookMapper;

    public BookAppService(BookMapper bookMapper)
    {
        _bookMapper = bookMapper;
    }

    public BookDto GetBook(Book book)
    {
        return _bookMapper.MapToDto(book);
    }
}

Note: Mapperly generates mapping code at compile-time, providing better performance than runtime mappers.

AutoMapper (runtime)

If the solution uses AutoMapper, mappings are typically defined in Profile classes and registered via ABP's AutoMapper integration.

© abpframework, LGPL-3.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in .agents/skills/abp-application-layer of abpframework/abp.

Open the folder on GitHubat commit 329eaa8

Compare with similar skills

Abp Application Layer next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Abp Application Layer compared with similar skills
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Abp Application Layer this skillabpframework/abp14k—~2kAutomated safety check: PassLGPL-3.0
Vercel Composition Patternssupabase/supabase111k58 repos~726Automated safety check: PassMIT
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PR Babysitteropeninterpreter/openinterpreter69k3 repos~4.2kAutomated safety check: PassApache-2.0
Code Review ChecklistshareAI-lab/learn-claude-code78k5 repos~1.1kAutomated safety check: PassMIT

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Categories

Questions about Abp Application Layer

What does Abp Application Layer do?

ABP Application Services, DTOs, CRUD service, object mapping (Mapperly/AutoMapper), validation, error handling. Abp Application Layer is an agent skill from abpframework/abp. ABP Application Services, DTOs, CRUD service, object mapping (Mapperly/AutoMapper), validation, error handling.

When should I use Abp Application Layer?

Abp Application Layer fits situations like: reviewing application services; working in the Application; application.Contracts projects.

How do I install Abp Application Layer in Claude Code?

Run `npx skills add abpframework/abp --skill abp-application-layer -a claude-code`. Or copy the skill folder (.agents/skills/abp-application-layer in abpframework/abp) into .claude/skills/abp-application-layer in your project. Claude Code loads it when a task matches its description.

How do I install Abp Application Layer in Codex?

Run `npx skills add abpframework/abp --skill abp-application-layer -a codex`. Or copy the skill folder (.agents/skills/abp-application-layer in abpframework/abp) into .agents/skills/abp-application-layer in your project. Codex loads it when a task matches its description.

Can I use Abp Application Layer in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add abpframework/abp --skill abp-application-layer -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/abp-application-layer, .gemini/skills/abp-application-layer, .github/skills/abp-application-layer and .opencode/skills/abp-application-layer in your project.

What does Abp Application Layer need to run?

SKILL.md names no scripts, command-line tools or credentials: Abp Application Layer is instructions for the agent only.

Does Abp Application Layer access the network?

SKILL.md names 1 domain. As links in the text: abp.io. This is read from the text; nothing was executed.

Is Abp Application Layer safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Abp Application Layer use?

Abp Application Layer is published under the LGPL-3.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Abp Application Layer use?

About 2k tokens (SKILL.md is roughly 7.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.

What are the alternatives to Abp Application Layer?

Skills that share tags, products or a category with Abp Application Layer: Vercel Composition Patterns (supabase/supabase, 111k stars), Finishing a Development Branch (obra/superpowers, 297k stars), Typescript Advanced Types (rolling-scopes/rsschool-app, 10k stars) and PR Babysitter (openinterpreter/openinterpreter, 69k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Abp Application Layer?

abpframework (a GitHub organization) maintains it in abpframework/abp, which has 14,445 GitHub stars. The repository holds 18 skills in this directory. The repository was last updated on October 9, 2026.

Source: abpframework/abp on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.