How do I install the Add Domain Entity skill?

Run npx skillmds@latest add atherio-danp/add-domain-entity in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

Is Add Domain Entity safe to use?

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Which AI agents work with Add Domain Entity?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Add Domain Entity free to use?

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Who published Add Domain Entity?

atherio-danp (@atherio-danp) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Add Domain Entity by atherio-danp — Agent Skill

Name: Add Domain Entity
Author: atherio-danp

Add Domain Entity

Add a domain entity, aggregate, or value object to the .NET API — rich mutable class with private ctor + static factory (UUIDv7), invariants that throw, tenant_id, identity equality; records for value objects. Use when modeling new domain state under apps/api/{{ProjectName}}.Domain.

atherio-danp 0aa0d2c 2.3 KB Updated Sep 17, 2026

File contents

Serena MCP is mandatory for C# code. First call mcp__serena__initial_instructions to load the Serena tool manual, then use the Serena tools for ALL .cs reading / searching / navigation / creation / editing — prefer symbol navigation (get_symbols_overview / find_symbol / find_referencing_symbols) over whole-file reads. Native Edit/Write on .cs is hook-blocked (the TS/React frontend uses the native tools).

Add a domain entity / value object

The procedure for our rich, base-class-free DDD model. Source of truth (the facts — read them): .claude/rules/backend/domain-model.md and docs/projectStandards/coding-standards.md. The domain is persistence-ignorant (no EF types/navigations). C# (.cs) edits via Serena.

Entity / aggregate

Place in {{ProjectName}}.Domain/<Feature>.
Rich mutable class (NEVER a record). Shape:
- a private parameterless constructor (EF materialization);
- a public static Create(...) (or named) factory with guard clauses that throws on invalid input and mints the id via Guid.CreateVersion7() (never Guid.NewGuid() / Guid.Empty-until-save);
- all setters private — state changes only through behaviour methods;
- invariants enforced inside every behaviour method (throw on violation — the domain is the last line of defence);
- a non-null TenantId preserved across mutations (the tenancy invariant);
- identity-based equality declared on the type itself (no base Entity/AggregateRoot, no domain events).
No primary constructors.

Value object

A record (or readonly record struct) — immutable, value equality (e.g. Money, ModelId, TenantId).

After

EF mapping (config) and repository → the efcore-patterns skill. Build (dotnet build, warnings = errors).
Tests (factory guards, invariant throws, behaviour) → the write-tests skill, per the plan's exact test list.

---name: add-domain-entitydescription: Add a domain entity, aggregate, or value object to the .NET API — rich mutable class with private ctor + static factory (UUIDv7), invariants that throw, tenant_id, identity equality; records for value objects. Use when modeling new domain state under apps/api/{{ProjectName}}.Domain.---> **Serena MCP is mandatory for C# code.** First call `mcp__serena__initial_instructions` to load the Serena tool manual, then use the Serena tools for ALL `.cs` reading / searching / navigation / creation / editing — prefer symbol navigation (`get_symbols_overview` / `find_symbol` / `find_referencing_symbols`) over whole-file reads. Native `Edit`/`Write` on `.cs` is hook-blocked (the TS/React frontend uses the native tools).# Add a domain entity / value objectThe procedure for our rich, base-class-free DDD model. Source of truth (the *facts* — read them):`.claude/rules/backend/domain-model.md` and `docs/projectStandards/coding-standards.md`. The domain is**persistence-ignorant** (no EF types/navigations). C# (`.cs`) edits via **Serena**.## Entity / aggregate1. Place in `{{ProjectName}}.Domain/<Feature>`.2. **Rich mutable class** (NEVER a record). Shape: - a **private parameterless constructor** (EF materialization); - a `public static Create(...)` (or named) **factory** with guard clauses that throws on invalid input and **mints the id via `Guid.CreateVersion7()`** (never `Guid.NewGuid()` / `Guid.Empty`-until-save); - **all setters private** — state changes only through behaviour methods; - **invariants enforced inside every behaviour method** (throw on violation — the domain is the last line of defence); - a non-null **`TenantId`** preserved across mutations (the tenancy invariant); - **identity-based equality** declared on the type itself (no base `Entity`/`AggregateRoot`, no domain events).3. **No primary constructors.**## Value object- A **record** (or `readonly record struct`) — immutable, value equality (e.g. `Money`, `ModelId`, `TenantId`).## After- EF mapping (config) and repository → the **`efcore-patterns`** skill. Build (`dotnet build`, warnings = errors).- Tests (factory guards, invariant throws, behaviour) → the **`write-tests`** skill, per the plan's exact test list.

Frequently asked questions