Agent skill

Add Entity

by fullstackhero in fullstackhero/dotnet-starter-kit

Add a domain entity/aggregate with EF configuration and a migration to an existing FSH module.

MITAuto-check passedDevelopment

Install Add Entity

skills CLI

$ npx skills add fullstackhero/dotnet-starter-kit --skill add-entity -a claude-code

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

GitHub CLI

$ gh skill install fullstackhero/dotnet-starter-kit add-entity --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/fullstackhero/dotnet-starter-kit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.agents/skills/add-entity .claude/skills/add-entity && 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 "add-entity" agent skill from https://github.com/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity into .claude/skills/add-entity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-entity", 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/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity

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 fullstackhero/dotnet-starter-kit --skill add-entity -a codex

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

GitHub CLI

$ gh skill install fullstackhero/dotnet-starter-kit add-entity --agent codex

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

Manual copy

$ git clone --depth 1 https://github.com/fullstackhero/dotnet-starter-kit.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.agents/skills/add-entity .agents/skills/add-entity && 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 "add-entity" agent skill from https://github.com/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity into .agents/skills/add-entity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-entity", 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 fullstackhero/dotnet-starter-kit --skill add-entity -a cursor

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

GitHub CLI

$ gh skill install fullstackhero/dotnet-starter-kit add-entity --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/fullstackhero/dotnet-starter-kit.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.agents/skills/add-entity .cursor/skills/add-entity && 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 "add-entity" agent skill from https://github.com/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity into .cursor/skills/add-entity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-entity", 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/fullstackhero/dotnet-starter-kit.git --path .agents/skills/add-entity

--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 fullstackhero/dotnet-starter-kit --skill add-entity -a gemini-cli

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

GitHub CLI

$ gh skill install fullstackhero/dotnet-starter-kit add-entity --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/fullstackhero/dotnet-starter-kit.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.agents/skills/add-entity .gemini/skills/add-entity && 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 "add-entity" agent skill from https://github.com/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity into .gemini/skills/add-entity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-entity", 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 fullstackhero/dotnet-starter-kit add-entity

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 fullstackhero/dotnet-starter-kit --skill add-entity -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/fullstackhero/dotnet-starter-kit.git skills-src && mkdir -p .github/skills && cp -r skills-src/.agents/skills/add-entity .github/skills/add-entity && 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 "add-entity" agent skill from https://github.com/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity into .github/skills/add-entity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-entity", 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 fullstackhero/dotnet-starter-kit --skill add-entity -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 fullstackhero/dotnet-starter-kit add-entity --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/fullstackhero/dotnet-starter-kit.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.agents/skills/add-entity .opencode/skills/add-entity && 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 "add-entity" agent skill from https://github.com/fullstackhero/dotnet-starter-kit/tree/main/.agents/skills/add-entity into .opencode/skills/add-entity/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "add-entity", 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: add-entity
GitHub stars: 6.8k
Token cost: ~1.2k tokens
SKILL.md length: 200 words
Files: 1
Skills in repo: 11
Repo updated: Sep 30, 2026
First seen: Oct 7, 2026
Licence: MIT

At a glance

Add a domain entity/aggregate with EF configuration and a migration to an existing FSH module.

Adding a new database-backed entity
SKILL.md covers Entity — AggregateRoot (or…, Domain event — inherit…, EF configuration and Register in the module DbContext, plus 2 more sections
Calls dotnet
Tasks that involve Project scaffolding

What it does

Add Entity is an agent skill from fullstackhero/dotnet-starter-kit. Add a domain entity/aggregate with EF configuration and a migration to an existing FSH module. Use when adding a new database-backed entity. Pairs with add-feature and create-migration.

Its SKILL.md is about 1.2k 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, covering Project scaffolding. The repository describes itself as: Production Grade Cloud-Ready .NET 10 Starter Kit (Web API + React Client) with Multitenancy Support, and Clean/Modular Architecture that saves roughly 200+ Development Hours! All… The licence is MIT.

When your agent uses it

Adding a new database-backed entity
Tasks that involve Project scaffolding

Example prompts

“/add-entity”

What it can do on your machine

Read from SKILL.md and the folder at commit 0bd98e3. 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
Shell commands in SKILL.md call:
- dotnet
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
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

Add Entity loads about 1.2k tokens when it runs. Until then it costs about 49 tokens; SKILL.md has 200 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~49
When it runs · the whole SKILL.md, loaded when a task matches: ~1.2k

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 fullstackhero/dotnet-starter-kit at commit 0bd98e3, republished under its MIT licence (© fullstackhero). 200 words, ~1,209 tokens.

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

name: add-entity
description: Add a domain entity/aggregate with EF configuration and a migration to an existing FSH module. Use when adding a new database-backed entity. Pairs with add-feature and create-migration.
argument-hint: [ModuleName] [EntityName]

Add Entity

Rich domain model: sealed aggregate, private EF ctor, static factory, behavior via methods, domain events. DB conventions: .agents/rules/database.md.

Entity — `AggregateRoot<Guid>` (or `BaseEntity<Guid>`)

BaseEntity<TId> gives only Id + domain-event machinery. Audit/tenant/soft-delete are opt-in via marker interfaces (the base does NOT carry those fields). New ids use Guid.CreateVersion7().

csharp

public sealed class {Entity} : AggregateRoot<Guid>, IHasTenant, IAuditableEntity, ISoftDeletable
{
    public string Name { get; private set; } = default!;
    public Money Price { get; private set; } = default!;

    // IHasTenant
    public string TenantId { get; private set; } = default!;
    // IAuditableEntity
    public DateTimeOffset CreatedOnUtc { get; set; }
    public string? CreatedBy { get; set; }
    public DateTimeOffset? LastModifiedOnUtc { get; set; }
    public string? LastModifiedBy { get; set; }
    // ISoftDeletable
    public bool IsDeleted { get; set; }
    public DateTimeOffset? DeletedOnUtc { get; set; }
    public string? DeletedBy { get; set; }

    private {Entity}() { }   // EF

    public static {Entity} Create(string name, Money price)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(name);
        ArgumentNullException.ThrowIfNull(price);

        var entity = new {Entity} { Id = Guid.CreateVersion7(), Name = name.Trim(), Price = price };
        entity.AddDomainEvent(DomainEvent.Create((id, ts) =>
            new {Entity}CreatedDomainEvent(entity.Id, entity.Name, id, ts)));
        return entity;
    }

    public void Rename(string name)
    {
        ArgumentException.ThrowIfNullOrWhiteSpace(name);
        Name = name.Trim();
    }
}

Notes: setters are private set; TenantId/audit/soft-delete members are settable by the framework (interceptor + Finbuckle) so they aren't private set. Use Guid.CreateVersion7(), never Guid.NewGuid().

Domain event — inherit `DomainEvent` (abstract record)

csharp

public sealed record {Entity}CreatedDomainEvent(
    Guid {Entity}Id, string Name, Guid EventId, DateTimeOffset OccurredOnUtc)
    : DomainEvent(EventId, OccurredOnUtc);

Raise with the DomainEvent.Create((id, ts) => …) helper + AddDomainEvent(...) (not QueueDomainEvent).

EF configuration

csharp

public sealed class {Entity}Configuration : IEntityTypeConfiguration<{Entity}>
{
    public void Configure(EntityTypeBuilder<{Entity}> builder)
    {
        ArgumentNullException.ThrowIfNull(builder);
        builder.ToTable("{Entities}");                       // schema is set once on the DbContext
        builder.HasKey(x => x.Id);
        builder.Property(x => x.Name).IsRequired().HasMaxLength(200);

        // soft-deletable unique field → filter on live rows only
        builder.HasIndex(x => x.Name).IsUnique().HasFilter("\"IsDeleted\" = FALSE");

        // owned value object
        builder.OwnsOne(x => x.Price, m =>
        {
            m.Property(p => p.Amount).HasColumnName("PriceAmount").HasPrecision(18, 4);
            m.Property(p => p.Currency).HasColumnName("PriceCurrency").HasMaxLength(3);
        });

        builder.Ignore(x => x.DomainEvents);
    }
}

Do NOT add a manual HasQueryFilter for soft-delete or tenant — BaseDbContext applies both automatically.
A child entity reached only via a parent nav-collection needs builder.Property(x => x.Id).ValueGeneratedNever() in its config, or EF inserts it as Modified → 0-row UPDATE. See database.md.

Register in the module DbContext

Add a DbSet; configurations are picked up by ApplyConfigurationsFromAssembly:

csharp

public DbSet<{Entity}> {Entities} => Set<{Entity}>();

The DbContext already extends BaseDbContext and calls base.OnModelCreating last — don't change that.

Migration

Use the create-migration skill (build first, correct --context):

bash

dotnet ef migrations add Add{Entity} \
  --project src/Host/FSH.Starter.Migrations.PostgreSQL \
  --startup-project src/Host/FSH.Starter.Api \
  --context {X}DbContext

Checklist

sealed, AggregateRoot<Guid> (+ IHasTenant/IAuditableEntity/ISoftDeletable as needed), private ctor, static Create using Guid.CreateVersion7()
Domain event inherits DomainEvent; raised via DomainEvent.Create + AddDomainEvent
EF config: no manual soft-delete/tenant filter; ValueGeneratedNever() on nav-collection children
DbSet added; build green; migration created with --context {X}DbContext

Files

Just SKILL.md in .agents/skills/add-entity of fullstackhero/dotnet-starter-kit.

Open the folder on GitHubat commit 0bd98e3

Compare with similar skills

Add Entity 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.

Add Entity compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Add Entity this skillfullstackhero/dotnet-starter-kit	6.8k	—	~1.2k	Automated safety check: Pass	MIT	7 days ago
AzureML Project ScaffoldingKilo-Org/kilo-marketplace	189	—	~3.1k	Automated safety check: Notes	MIT	9 days ago
New Resourcemondoohq/mql	411	—	~5.6k	Automated safety check: Pass	Custom licence	today
Dynamo Webview Component ScaffoldDynamoDS/Dynamo	2k	—	~991	Automated safety check: Pass	Apache-2.0	today
Deployjustrach/merjs	356	—	~171	Automated safety check: Pass	MIT	1 mo ago
Upgrade Harnessruvnet/metaharness	688	—	~497	Automated safety check: Pass	MIT	yesterday

Similar skills

AzureML Project Scaffolding
Kilo-Org/kilo-marketplace
Sets up and maintains AzureML-ready Python projects as uv workspaces with devcontainers, a Makefile and job YAML, so local runs match cloud jobs and experiments stay reproducible.
189 GitHub stars~3.1k tokensUpdated 9 days ago
DevelopmentAuto-check: notes
New Resource
mondoohq/mql
Add or change a resource in an existing mql provider — schema, codegen, implementation, tests, and verification against a real target.
411 GitHub stars~5.6k tokensUpdated today
DevelopmentAuto-check passed
Dynamo Webview Component Scaffold
DynamoDS/Dynamo
Scaffolds a new Dynamo package repo that hosts a view extension with a WebView2-embedded React frontend.
2k GitHub stars~991 tokensUpdated today
DevelopmentAuto-check passed
Deploy
justrach/merjs
Full production build — codegen, compile, prerender, and prepare for deployment.
356 GitHub stars~171 tokensUpdated 1 mo ago
DevelopmentAuto-check passed
Upgrade Harness
ruvnet/metaharness
Drift detection + apply for a scaffolded harness. An agent skill from ruvnet/metaharness.
688 GitHub stars~497 tokensUpdated yesterday
DevelopmentAuto-check passed
Start Temps
gotempsh/temps
Start (or restart) a local Temps control plane built from this checkout, and the web dev server (bun dev) in <checkout/web.
822 GitHub stars~5.4k tokensUpdated today
DevelopmentAuto-check passed

Questions about Add Entity

What does Add Entity do?

Add a domain entity/aggregate with EF configuration and a migration to an existing FSH module. Add Entity is an agent skill from fullstackhero/dotnet-starter-kit. Add a domain entity/aggregate with EF configuration and a migration to an existing FSH module.

When should I use Add Entity?

Add Entity fits situations like: adding a new database-backed entity; tasks that involve Project scaffolding.

How do I install Add Entity in Claude Code?

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

How do I install Add Entity in Codex?

Run `npx skills add fullstackhero/dotnet-starter-kit --skill add-entity -a codex`. Or copy the skill folder (.agents/skills/add-entity in fullstackhero/dotnet-starter-kit) into .agents/skills/add-entity in your project. Codex loads it when a task matches its description.

Can I use Add Entity 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 fullstackhero/dotnet-starter-kit --skill add-entity -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/add-entity, .gemini/skills/add-entity, .github/skills/add-entity and .opencode/skills/add-entity in your project.

What does Add Entity need to run?

Going by SKILL.md and its folder, Add Entity needs the command-line tools its instructions call (dotnet).

Does Add Entity access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Add Entity 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 Add Entity use?

Add Entity is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Add Entity use?

About 1.2k tokens (SKILL.md is roughly 4.8k 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 Add Entity?

Skills that share tags, products or a category with Add Entity: AzureML Project Scaffolding (Kilo-Org/kilo-marketplace, 189 stars), New Resource (mondoohq/mql, 411 stars), Dynamo Webview Component Scaffold (DynamoDS/Dynamo, 2k stars) and Deploy (justrach/merjs, 356 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Add Entity?

fullstackhero (a GitHub organization) maintains it in fullstackhero/dotnet-starter-kit, which has 6,813 GitHub stars. The repository holds 11 skills in this directory. The repository was last updated on September 30, 2026.

Source: fullstackhero/dotnet-starter-kit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.

Add Entity

Install Add Entity

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

Add Entity

Entity — `AggregateRoot<Guid>` (or `BaseEntity<Guid>`)

Domain event — inherit `DomainEvent` (abstract record)

EF configuration

Register in the module DbContext

Migration

Checklist

Files

Compare with similar skills

Similar skills

AzureML Project Scaffolding

New Resource

Dynamo Webview Component Scaffold

Deploy

Upgrade Harness

Start Temps

More from fullstackhero/dotnet-starter-kit

Add Feature

Add Full Slice

Add Integration Event

Add Module

Add Permission

Add React Page

Questions about Add Entity

Install Add Entity

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

Add Entity

Entity — AggregateRoot<Guid> (or BaseEntity<Guid>)

Domain event — inherit DomainEvent (abstract record)

EF configuration

Register in the module DbContext

Migration

Checklist

Files

Compare with similar skills

Similar skills

More from fullstackhero/dotnet-starter-kit

Related

Questions about Add Entity

Entity — `AggregateRoot<Guid>` (or `BaseEntity<Guid>`)

Domain event — inherit `DomainEvent` (abstract record)