Agent skill

Abp Ddd

ABP DDD patterns - Entities, Aggregate Roots, value objects, Repositories, Domain Services, Domain Events, Specifications.

LGPL-3.0Auto-check passedDevelopment

Install Abp Ddd

skills CLI

$ npx skills add abpframework/abp --skill abp-ddd -a claude-code

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

GitHub CLI

$ gh skill install abpframework/abp abp-ddd --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-ddd .claude/skills/abp-ddd && 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/

Paste into Claude Code

Install the "abp-ddd" agent skill from https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd into .claude/skills/abp-ddd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "abp-ddd", then confirm the skill loads.

Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

$skill-installer

$skill-installer install https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd

Type this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.

skills CLI

$ npx skills add abpframework/abp --skill abp-ddd -a codex

Project install goes to .agents/skills/; add -g for ~/.codex/skills/.

GitHub CLI

$ gh skill install abpframework/abp abp-ddd --agent codex

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

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

Use ~/.agents/skills/ instead of .agents/skills for a personal install.

Codex skills documentation · loads skills from .agents/skills/

Paste into Codex

Install the "abp-ddd" agent skill from https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd into .agents/skills/abp-ddd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "abp-ddd", then confirm the skill loads.

Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add abpframework/abp --skill abp-ddd -a cursor

Project install goes to .agents/skills/; add -g for ~/.cursor/skills/.

GitHub CLI

$ gh skill install abpframework/abp abp-ddd --agent cursor

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/abpframework/abp.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/abp-ddd .cursor/skills/abp-ddd && rm -rf skills-src

Use ~/.cursor/skills/ instead of .cursor/skills for a personal install.

Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/

Paste into Cursor

Install the "abp-ddd" agent skill from https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd into .cursor/skills/abp-ddd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "abp-ddd", then confirm the skill loads.

Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

gemini skills install

$ gemini skills install https://github.com/abpframework/abp.git --path .agents/skills/abp-ddd

--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.

skills CLI

$ npx skills add abpframework/abp --skill abp-ddd -a gemini-cli

Project install goes to .agents/skills/; add -g for ~/.gemini/skills/.

GitHub CLI

$ gh skill install abpframework/abp abp-ddd --agent gemini-cli

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/abpframework/abp.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/abp-ddd .gemini/skills/abp-ddd && rm -rf skills-src

Use ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.

Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/

Paste into Gemini CLI

Install the "abp-ddd" agent skill from https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd into .gemini/skills/abp-ddd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "abp-ddd", then confirm the skill loads.

Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

GitHub CLI

$ gh skill install abpframework/abp abp-ddd

Installs for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).

skills CLI

$ npx skills add abpframework/abp --skill abp-ddd -a github-copilot

Project install goes to .agents/skills/; add -g for ~/.copilot/skills/.

Manual copy

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

Use ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.

GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/

Paste into GitHub Copilot

Install the "abp-ddd" agent skill from https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd into .github/skills/abp-ddd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "abp-ddd", then confirm the skill loads.

GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

skills CLI

$ npx skills add abpframework/abp --skill abp-ddd -a opencode

OpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.

GitHub CLI

$ gh skill install abpframework/abp abp-ddd --agent opencode

Project scope by default (.agents/skills/); add --scope user for a personal install.

Manual copy

$ git clone --depth 1 https://github.com/abpframework/abp.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/abp-ddd .opencode/skills/abp-ddd && rm -rf skills-src

Use ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.

OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/

Paste into OpenCode

Install the "abp-ddd" agent skill from https://github.com/abpframework/abp/tree/dev/.agents/skills/abp-ddd into .opencode/skills/abp-ddd/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "abp-ddd", then confirm the skill loads.

OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.

Facts

Skill name: abp-ddd
GitHub stars: 14k
Token cost: ~2.1k tokens
SKILL.md length: 433 words
Files: 1
Skills in repo: 18
Repo updated: Oct 9, 2026
First seen: Oct 8, 2026
Licence: LGPL-3.0

At a glance

ABP DDD patterns - Entities, Aggregate Roots, value objects, Repositories, Domain Services, Domain Events, Specifications.

Designing domain layer
SKILL.md covers Anti-Patterns to Avoid, Rich Domain Model vs Anemic…, Entities and Aggregate Roots, plus 4 more sections
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
Creating entities

What it does

Abp Ddd is an agent skill from abpframework/abp. ABP DDD patterns - Entities, Aggregate Roots, value objects, Repositories, Domain Services, Domain Events, Specifications. Use when designing domain layer, creating entities, repositories, or domain services in ABP projects.

Its SKILL.md is about 2.1k 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, covering Domain-driven design. 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

Designing domain layer
Creating entities
Domain services in ABP projects

Example prompts

“/abp-ddd”

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 Ddd loads about 2.1k tokens when it runs. Until then it costs about 58 tokens; SKILL.md has 433 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~58
When it runs · the whole SKILL.md, loaded when a task matches: ~2.1k

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). 433 words, ~2,117 tokens.

Download SKILL.mdSave it as .claude/skills/abp-ddd/SKILL.md (or your agent's skills folder).

name: abp-ddd
description: ABP DDD patterns - Entities, Aggregate Roots, value objects, Repositories, Domain Services, Domain Events, Specifications. Use when designing domain layer, creating entities, repositories, or domain services in ABP projects.

ABP DDD Patterns

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

Anti-Patterns to Avoid

Anemic entities: public setters with no behavior — use private setters + methods that enforce invariants
Repository for child entities: only aggregate roots get repositories — access child entities through their root
Generating GUID in entity constructor: use IGuidGenerator from outside and pass id parameter
Navigation properties to other aggregates: reference by Id only, never add full navigation properties across aggregates
Domain service depending on current user: accept values from the application layer instead

Rich Domain Model vs Anemic Domain Model

ABP promotes Rich Domain Model pattern where entities contain both data AND behavior:

Anemic (Anti-pattern)	Rich (Recommended)
Entity = data only	Entity = data + behavior
Logic in services	Logic in entity methods
Public setters	Private setters with methods
No validation in entity	Entity enforces invariants

Encapsulation is key: Protect entity state by using private setters and exposing behavior through methods.

Entities

Entity Example (Rich Model)

csharp

public class OrderLine : Entity<Guid>
{
    public Guid ProductId { get; private set; }
    public int Count { get; private set; }
    public decimal Price { get; private set; }

    protected OrderLine() { } // For ORM

    internal OrderLine(Guid id, Guid productId, int count, decimal price) : base(id)
    {
        ProductId = productId;
        SetCount(count); // Validates through method
        Price = price;
    }

    public void SetCount(int count)
    {
        if (count <= 0)
            throw new BusinessException("Orders:InvalidCount");
        Count = count;
    }
}

Aggregate Roots

Aggregate roots are consistency boundaries that:

Own their child entities
Enforce business rules
Publish domain events

csharp

public class Order : AggregateRoot<Guid>
{
    public string OrderNumber { get; private set; }
    public Guid CustomerId { get; private set; }
    public OrderStatus Status { get; private set; }
    public ICollection<OrderLine> Lines { get; private set; }

    protected Order() { } // For ORM

    public Order(Guid id, string orderNumber, Guid customerId) : base(id)
    {
        OrderNumber = Check.NotNullOrWhiteSpace(orderNumber, nameof(orderNumber));
        CustomerId = customerId;
        Status = OrderStatus.Created;
        Lines = new List<OrderLine>();
    }

    public void AddLine(Guid lineId, Guid productId, int count, decimal price)
    {
        // Business rule: Can only add lines to created orders
        if (Status != OrderStatus.Created)
            throw new BusinessException("Orders:CannotModifyOrder");

        Lines.Add(new OrderLine(lineId, productId, count, price));
    }

    public void Complete()
    {
        if (Status != OrderStatus.Created)
            throw new BusinessException("Orders:CannotCompleteOrder");

        Status = OrderStatus.Completed;

        // Publish events for side effects
        AddLocalEvent(new OrderCompletedEvent(Id));           // Same transaction
        AddDistributedEvent(new OrderCompletedEto { OrderId = Id }); // Cross-service
    }
}

Domain Events

AddLocalEvent() - Handled within same transaction, can access full entity
AddDistributedEvent() - Handled asynchronously, use ETOs (Event Transfer Objects)

Entity Best Practices

Encapsulation: Private setters, public methods that enforce rules
Primary constructor: Enforce invariants, accept id parameter
Protected parameterless constructor: Required for ORM
Initialize collections: In primary constructor
Virtual members: For ORM proxy compatibility
Reference by Id: Don't add navigation properties to other aggregates
Don't generate GUID in constructor: Use IGuidGenerator externally

Repository Pattern

When to Use Custom Repository

Generic repository (IRepository<T, TKey>): Sufficient for simple CRUD operations
Custom repository: Only when you need custom query methods

Show full SKILL.md (169 more words)Show less

Interface (Domain Layer)

csharp

// Define custom interface only when custom queries are needed
public interface IOrderRepository : IRepository<Order, Guid>
{
    Task<Order> FindByOrderNumberAsync(string orderNumber, bool includeDetails = false);
    Task<List<Order>> GetListByCustomerAsync(Guid customerId, bool includeDetails = false);
}

Repository Best Practices

One repository per aggregate root only - Never create repositories for child entities
Child entities must be accessed/modified only through their aggregate root
Creating repositories for child entities breaks data consistency (bypasses aggregate root's business rules)
In ABP, use AddDefaultRepositories() without includeAllEntities: true to enforce this
Define custom repository only when custom queries are needed
ABP handles CancellationToken automatically; add parameter only for explicit cancellation control
Single entity methods: includeDetails = true by default
List methods: includeDetails = false by default
Don't return projection classes
Interface in Domain, implementation in data layer

csharp

// ✅ Correct: Repository for aggregate root (Order)
public interface IOrderRepository : IRepository<Order, Guid> { }

// ❌ Wrong: Repository for child entity (OrderLine)
// OrderLine should only be accessed through Order aggregate
public interface IOrderLineRepository : IRepository<OrderLine, Guid> { } // Don't do this!

Domain Services

Use domain services for business logic that:

Spans multiple aggregates
Requires repository queries to enforce rules

csharp

public class OrderManager : DomainService
{
    private readonly IOrderRepository _orderRepository;
    private readonly IProductRepository _productRepository;

    public OrderManager(
        IOrderRepository orderRepository,
        IProductRepository productRepository)
    {
        _orderRepository = orderRepository;
        _productRepository = productRepository;
    }

    public async Task<Order> CreateAsync(string orderNumber, Guid customerId)
    {
        // Business rule: Order number must be unique
        var existing = await _orderRepository.FindByOrderNumberAsync(orderNumber);
        if (existing != null)
        {
            throw new BusinessException("Orders:OrderNumberAlreadyExists")
                .WithData("OrderNumber", orderNumber);
        }

        return new Order(GuidGenerator.Create(), orderNumber, customerId);
    }

    public async Task AddProductAsync(Order order, Guid productId, int count)
    {
        var product = await _productRepository.GetAsync(productId);
        order.AddLine(productId, count, product.Price);
    }
}

Domain Service Best Practices

Use *Manager suffix naming
No interface by default (create only if needed)
Accept/return domain objects, not DTOs
Don't depend on authenticated user - pass values from application layer
Use base class properties (GuidGenerator, Clock) instead of injecting these services

Domain Events

Local Events

csharp

// In aggregate
AddLocalEvent(new OrderCompletedEvent(Id));

// Handler
public class OrderCompletedEventHandler : ILocalEventHandler<OrderCompletedEvent>, ITransientDependency
{
    public async Task HandleEventAsync(OrderCompletedEvent eventData)
    {
        // Handle within same transaction
    }
}

Distributed Events (ETO)

For inter-module/microservice communication:

csharp

// In Domain.Shared
[EventName("Orders.OrderCompleted")]
public class OrderCompletedEto
{
    public Guid OrderId { get; set; }
    public string OrderNumber { get; set; }
}

Specifications

Reusable query conditions:

csharp

public class CompletedOrdersSpec : Specification<Order>
{
    public override Expression<Func<Order, bool>> ToExpression()
    {
        return o => o.Status == OrderStatus.Completed;
    }
}

// Usage
var orders = await _orderRepository.GetListAsync(new CompletedOrdersSpec());

Files

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

Open the folder on GitHubat commit 329eaa8

Compare with similar skills

Abp Ddd 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 Ddd compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Abp Ddd this skillabpframework/abp	14k	—	~2.1k	Automated safety check: Pass	LGPL-3.0	today
Domain Modelingfossasia/eventyay-interpretation	1.6k	31 repos	~821	Automated safety check: Pass	Apache-2.0	3 days ago
Architecture Governancezai-org/ZCode	7.6k	—	~1.2k	Automated safety check: Pass	Apache-2.0	9 days ago
Evolutionary Modular Architecturetech-leads-club/agent-skills	7k	—	~3.7k	Automated safety check: Pass	CC-BY-4.0	today
Domain Modelingbrim-borium/spotify_sdk	166	5 repos	~806	Automated safety check: Pass	Apache-2.0	today
Domain Modeling and Glossarywindmill-labs/windmill	18k	—	~622	Automated safety check: Pass	Custom licence	today

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Questions about Abp Ddd

What does Abp Ddd do?

ABP DDD patterns - Entities, Aggregate Roots, value objects, Repositories, Domain Services, Domain Events, Specifications. Abp Ddd is an agent skill from abpframework/abp. ABP DDD patterns - Entities, Aggregate Roots, value objects, Repositories, Domain Services, Domain Events, Specifications.

When should I use Abp Ddd?

Abp Ddd fits situations like: designing domain layer; creating entities; domain services in ABP projects.

How do I install Abp Ddd in Claude Code?

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

How do I install Abp Ddd in Codex?

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

Can I use Abp Ddd 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-ddd -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-ddd, .gemini/skills/abp-ddd, .github/skills/abp-ddd and .opencode/skills/abp-ddd in your project.

What does Abp Ddd need to run?

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

Does Abp Ddd 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 Ddd 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 Ddd use?

Abp Ddd 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 Ddd use?

About 2.1k tokens (SKILL.md is roughly 8.5k 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 Ddd?

Skills that share tags, products or a category with Abp Ddd: Domain Modeling (fossasia/eventyay-interpretation, 1.6k stars), Architecture Governance (zai-org/ZCode, 7.6k stars), Evolutionary Modular Architecture (tech-leads-club/agent-skills, 7k stars) and Domain Modeling (brim-borium/spotify_sdk, 166 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Abp Ddd?

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.

Install Abp Ddd

Facts

At a glance

What it does

When your agent uses it

Example prompts

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

ABP DDD Patterns

Anti-Patterns to Avoid

Rich Domain Model vs Anemic Domain Model

Entities

Entity Example (Rich Model)

Aggregate Roots

Domain Events

Entity Best Practices

Repository Pattern

When to Use Custom Repository

Interface (Domain Layer)

Repository Best Practices

Domain Services

Domain Service Best Practices

Domain Events

Local Events

Distributed Events (ETO)

Specifications

Files

Compare with similar skills

Similar skills

More from abpframework/abp

Related

Questions about Abp Ddd