Agent skill

Domain Model

Actively build and sharpen a project's domain model - challenge terms against the glossary, stress-test boundaries with scenarios, cross-reference against the code, and record the glossary…

Apache-2.0Auto-check passedDevelopment

Install Domain Model

skills CLI

$ npx skills add sammcj/agentic-coding --skill domain-model -a claude-code

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

GitHub CLI

$ gh skill install sammcj/agentic-coding domain-model --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/sammcj/agentic-coding.git skills-src && mkdir -p .claude/skills && cp -r skills-src/Skills_disabled/domain-model .claude/skills/domain-model && 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 "domain-model" agent skill from https://github.com/sammcj/agentic-coding/tree/main/Skills_disabled/domain-model into .claude/skills/domain-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-model", 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/sammcj/agentic-coding/tree/main/Skills_disabled/domain-model

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 sammcj/agentic-coding --skill domain-model -a codex

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

GitHub CLI

$ gh skill install sammcj/agentic-coding domain-model --agent codex

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

Manual copy

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

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

GitHub CLI

$ gh skill install sammcj/agentic-coding domain-model --agent cursor

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

Manual copy

$ git clone --depth 1 https://github.com/sammcj/agentic-coding.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/Skills_disabled/domain-model .cursor/skills/domain-model && 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 "domain-model" agent skill from https://github.com/sammcj/agentic-coding/tree/main/Skills_disabled/domain-model into .cursor/skills/domain-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-model", 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/sammcj/agentic-coding.git --path Skills_disabled/domain-model

--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 sammcj/agentic-coding --skill domain-model -a gemini-cli

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

GitHub CLI

$ gh skill install sammcj/agentic-coding domain-model --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/sammcj/agentic-coding.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/Skills_disabled/domain-model .gemini/skills/domain-model && 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 "domain-model" agent skill from https://github.com/sammcj/agentic-coding/tree/main/Skills_disabled/domain-model into .gemini/skills/domain-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-model", 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 sammcj/agentic-coding domain-model

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 sammcj/agentic-coding --skill domain-model -a github-copilot

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

Manual copy

$ git clone --depth 1 https://github.com/sammcj/agentic-coding.git skills-src && mkdir -p .github/skills && cp -r skills-src/Skills_disabled/domain-model .github/skills/domain-model && 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 "domain-model" agent skill from https://github.com/sammcj/agentic-coding/tree/main/Skills_disabled/domain-model into .github/skills/domain-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-model", 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 sammcj/agentic-coding --skill domain-model -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 sammcj/agentic-coding domain-model --agent opencode

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

Manual copy

$ git clone --depth 1 https://github.com/sammcj/agentic-coding.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/Skills_disabled/domain-model .opencode/skills/domain-model && 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 "domain-model" agent skill from https://github.com/sammcj/agentic-coding/tree/main/Skills_disabled/domain-model into .opencode/skills/domain-model/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "domain-model", 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: domain-model
GitHub stars: 162
Token cost: ~883 tokens
SKILL.md length: 402 words
Files: 3
Skills in repo: 64
Repo updated: Oct 9, 2026
First seen: Oct 7, 2026
Licence: Apache-2.0

At a glance

Actively build and sharpen a project's domain model - challenge terms against the glossary, stress-test boundaries with scenarios, cross-reference against the code, and record the glossary…

Works in 3 steps: Hard to reverse - the cost of changing… → Surprising without context - a future… → The result of a real trade-off - there…
You are changing the domain model itself
SKILL.md covers File structure and During the session
Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Domain Model is an agent skill from sammcj/agentic-coding. Actively build and sharpen a project's domain model - challenge terms against the glossary, stress-test boundaries with scenarios, cross-reference against the code, and record the glossary (CONTEXT.md) and decisions (ADRs) the moment they crystallise. Use when you are changing the domain model itself, pinning down a ubiquitous language, or recording an architectural decision.

Its SKILL.md is about 880 tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files (for example `ADR-FORMAT.md` and `CONTEXT-FORMAT.md`).

It sits in Development, covering Architecture decision records, Load testing and Domain-driven design. The repository describes itself as: Agentic Coding Rules, Templates etc... The licence is Apache-2.0.

When your agent uses it

You are changing the domain model itself
Pinning down a ubiquitous language
Recording an architectural decision

Example prompts

“/domain-model”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

Hard to reverse - the cost of changing your mind later is meaningful
Surprising without context - a future reader will wonder "why did they do it this way?"
The result of a real trade-off - there were genuine alternatives and you picked one for specific reasons

What it can do on your machine

Read from SKILL.md and the folder at commit 2f25ced. 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.
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

Domain Model loads about 883 tokens when it runs. Until then it costs about 98 tokens; SKILL.md has 402 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it: ~98
When it runs · the whole SKILL.md, loaded when a task matches: ~883

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 sammcj/agentic-coding at commit 2f25ced, republished under its Apache-2.0 licence (© sammcj). 402 words, ~883 tokens.

Download SKILL.mdSave it as .claude/skills/domain-model/SKILL.md (or your agent's skills folder). This skill also uses 2 other files; get the full folder from GitHub.

name: domain-model
description: Actively build and sharpen a project's domain model - challenge terms against the glossary, stress-test boundaries with scenarios, cross-reference against the code, and record the glossary (CONTEXT.md) and decisions (ADRs) the moment they crystallise. Use when you are changing the domain model itself, pinning down a ubiquitous language, or recording an architectural decision.
disable-model-invocation: true
metadata.source: https://github.com/mattpocock/skills

Domain modelling

Actively build and sharpen the project's domain model as you design. This is the active discipline - challenging terms, inventing edge-case scenarios, and writing the glossary and decisions down the moment they crystallise. Merely reading CONTEXT.md for vocabulary is not this skill; that is a one-line habit any skill can do. This skill is for when you are changing the model, not just consuming it.

File structure

Most repos have a single context:

/
├── CONTEXT.md
├── docs/
│   └── adr/
│       ├── 0001-event-sourced-orders.md
│       └── 0002-postgres-for-write-model.md
└── src/

If a CONTEXT-MAP.md exists at the root, the repo has multiple contexts. The map points to where each one lives:

/
├── CONTEXT-MAP.md
├── docs/
│   └── adr/                          ← system-wide decisions
├── src/
│   ├── ordering/
│   │   ├── CONTEXT.md
│   │   └── docs/adr/                 ← context-specific decisions
│   └── billing/
│       ├── CONTEXT.md
│       └── docs/adr/

Create files lazily - only when you have something to write. If no CONTEXT.md exists, create one when the first term is resolved. If no docs/adr/ exists, create it when the first ADR is needed.

During the session

Challenge against the glossary

When the user uses a term that conflicts with the existing language in CONTEXT.md, call it out immediately. "Your glossary defines 'cancellation' as X, but you seem to mean Y - which is it?"

Sharpen fuzzy language

When the user uses vague or overloaded terms, propose a precise canonical term. "You're saying 'account' - do you mean the Customer or the User? Those are different things."

Discuss concrete scenarios

When domain relationships are being discussed, stress-test them with specific scenarios. Invent scenarios that probe edge cases and force the user to be precise about the boundaries between concepts.

Show full SKILL.md (171 more words)Show less

Cross-reference with code

When the user states how something works, check whether the code agrees. If you find a contradiction, surface it: "Your code cancels entire Orders, but you just said partial cancellation is possible - which is right?"

Update CONTEXT.md inline

When a term is resolved, update CONTEXT.md right there. Don't batch these up - capture them as they happen. Use the format in CONTEXT-FORMAT.md.

CONTEXT.md should be totally devoid of implementation details. Do not treat CONTEXT.md as a spec, a scratch pad, or a repository for implementation decisions. It is a glossary and nothing else.

Offer ADRs sparingly

Only offer to create an ADR when all three are true:

Hard to reverse - the cost of changing your mind later is meaningful
Surprising without context - a future reader will wonder "why did they do it this way?"
The result of a real trade-off - there were genuine alternatives and you picked one for specific reasons

If any of the three is missing, skip the ADR. Use the format in ADR-FORMAT.md.

Files

SKILL.md and 2 other files in Skills_disabled/domain-model of sammcj/agentic-coding.

SKILL.md
ADR-FORMAT.md
CONTEXT-FORMAT.md

Open the folder on GitHubat commit 2f25ced

Compare with similar skills

Domain Model 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.

Domain Model compared with similar skills
Skill	Stars	Used in	Tokens	Auto-check	Licence	Repo updated
Domain Model this skillsammcj/agentic-coding	162	—	~883	Automated safety check: Pass	Apache-2.0	today
Domain Modelingromiluz13/cc10x	164	—	~1.8k	Automated safety check: Pass	MIT	2 days ago
Critique Planayoubben18/ab-method	192	—	~1.4k	Automated safety check: Pass	MIT	8 days ago
Domain Modelingbrim-borium/spotify_sdk	166	5 repos	~806	Automated safety check: Pass	Apache-2.0	today
Grill With Docsmeain/dotfiles	285	20 repos	~875	Automated safety check: Pass	MIT	yesterday
Domain Modelingvinvcn/mattpocock-skills-zh-CN	4.7k	—	~477	Automated safety check: Pass	MIT	yesterday

Similar skills

Domain Modeling
romiluz13/cc10x
A skill your agent uses when changing or sharpening a project's domain model: challenge terms against the glossary, sharpen fuzzy language, stress-test with edge-case scenarios, update CONTEXT.md…
164 GitHub stars~1.8k tokensUpdated 2 days ago
DevelopmentAuto-check passed
Critique Plan
ayoubben18/ab-method
Pre-implementation critic. An agent skill from ayoubben18/ab-method.
192 GitHub stars~1.4k tokensUpdated 8 days ago
DevelopmentAuto-check passed
Domain Modeling
brim-borium/spotify_sdk
Build and sharpen a project's domain model. An agent skill from brim-borium/spotify_sdk.
166 GitHub starsUsed in 5 repos~806 tokens
DevelopmentAuto-check passed
Grill With Docs
meain/dotfiles
Grilling session that challenges your plan against the existing domain model, sharpens terminology, and updates documentation (CONTEXT.md, ADRs) inline as decisions crystallise.
285 GitHub starsUsed in 20 repos~875 tokens
DevelopmentAuto-check passed
Domain Modeling
vinvcn/mattpocock-skills-zh-CN
构建并打磨项目的领域模型。适用于讨论 codebase 术语、编写或编辑 GLOSSARY.md，或记录或编辑 ADR。
4.7k GitHub stars~477 tokensUpdated yesterday
DevelopmentAuto-check passed
Grill With Docs
ayoubben18/ab-method
Grilling session that challenges your plan against the existing domain model, sharpens terminology, and updates documentation (CONTEXT.md, ADRs) inline as decisions crystallise.
192 GitHub stars~2.1k tokensUpdated 8 days ago
DevelopmentAuto-check passed

Questions about Domain Model

What does Domain Model do?

Actively build and sharpen a project's domain model - challenge terms against the glossary, stress-test boundaries with scenarios, cross-reference against the code, and record the glossary…. Domain Model is an agent skill from sammcj/agentic-coding.md) and decisions (ADRs) the moment they crystallise.

When should I use Domain Model?

Domain Model fits situations like: you are changing the domain model itself; pinning down a ubiquitous language; recording an architectural decision.

How do I install Domain Model in Claude Code?

Run `npx skills add sammcj/agentic-coding --skill domain-model -a claude-code`. Or copy the skill folder (Skills_disabled/domain-model in sammcj/agentic-coding) into .claude/skills/domain-model in your project. Claude Code loads it when a task matches its description.

How do I install Domain Model in Codex?

Run `npx skills add sammcj/agentic-coding --skill domain-model -a codex`. Or copy the skill folder (Skills_disabled/domain-model in sammcj/agentic-coding) into .agents/skills/domain-model in your project. Codex loads it when a task matches its description.

Can I use Domain Model 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 sammcj/agentic-coding --skill domain-model -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/domain-model, .gemini/skills/domain-model, .github/skills/domain-model and .opencode/skills/domain-model in your project.

What does Domain Model need to run?

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

Does Domain Model 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 Domain Model 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 Domain Model use?

Domain Model is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Domain Model use?

About 883 tokens (SKILL.md is roughly 3.5k 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 Domain Model?

Skills that share tags, products or a category with Domain Model: Domain Modeling (romiluz13/cc10x, 164 stars), Critique Plan (ayoubben18/ab-method, 192 stars), Domain Modeling (brim-borium/spotify_sdk, 166 stars) and Grill With Docs (meain/dotfiles, 285 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Domain Model?

sammcj (a GitHub user) maintains it in sammcj/agentic-coding, which has 162 GitHub stars. The repository holds 64 skills in this directory. The repository was last updated on October 9, 2026.

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

Install Domain Model

Facts

At a glance

What it does

When your agent uses it

Example prompts

Workflow steps

What it can do on your machine

Tool permissions

Runs code

Network

Credentials

Context cost

Safety

SKILL.md

Domain modelling

File structure

During the session

Challenge against the glossary

Sharpen fuzzy language

Discuss concrete scenarios

Cross-reference with code

Update CONTEXT.md inline

Offer ADRs sparingly

Files

Compare with similar skills

Similar skills

More from sammcj/agentic-coding

Related

Questions about Domain Model