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Ubiquitous Language

Skills

Build a shared glossary of your project's terms.

From Matt Pocock's skills. Your agent pulls a domain-driven-design glossary out of the conversation, flags ambiguous terms and proposes the canonical word for each.

Install this skill

npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language

Runs the open-source skills CLI in your own terminal. It asks which agents to add the skill to. Read what it tells your agent to do before you install it.

Download skill (.zip)

Install for your agent

  • Claude Code

    Run this in your project

    npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language -a claude-code

    Add -g to install it for every project instead.

    Or ask Claude Code to do it

    Install the "ubiquitous-language" skill from https://github.com/mattpocock/skills for Claude Code.
Copy the skill folder (the one containing SKILL.md, with any scripts or reference files next to it) into .claude/skills/ in this project.
Before copying, show me the SKILL.md and list any scripts it includes, and wait for me to confirm.

    Or copy the folder yourself

    Unzip the download into .claude/skills/ for this project, or ~/.claude/skills/ for all your projects.

    Picked up in the current session, no restart needed.

    Claude Code skills docs
  • Claude.ai

    Upload the ZIP

    1. In Settings > Capabilities, turn on Code execution and file creation.
    2. Go to Customize > Skills, press +, then Create skill.
    3. Choose Upload a skill and pick the ZIP you downloaded.

    Free, Pro and Max plans. On Team and Enterprise, an owner turns skills on in Organization settings first.

    Claude.ai skills docs
  • ChatGPT

    Upload the ZIP

    1. Open Skills in ChatGPT and select Create.
    2. Select Upload from your computer and pick the ZIP you downloaded.
    3. Wait for ChatGPT's safety scan. A skill marked Needs Review asks you to check it before use.

    Skills that rely on scripts or a terminal may not work unchanged in ChatGPT.

    ChatGPT skills docs
  • Codex

    Run this in your project

    npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language -a codex

    Add -g to install it for every project instead.

    Or ask Codex to do it

    Install the "ubiquitous-language" skill from https://github.com/mattpocock/skills for Codex.
Copy the skill folder (the one containing SKILL.md, with any scripts or reference files next to it) into .agents/skills/ in this project.
Before copying, show me the SKILL.md and list any scripts it includes, and wait for me to confirm.

    Or copy the folder yourself

    Unzip the download into .agents/skills/ for this project, or ~/.agents/skills/ for all your projects.

    Restart Codex if the skill does not show up.

    Codex skills docs
  • Cursor

    Run this in your project

    npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language -a cursor

    Add -g to install it for every project instead.

    Or ask Cursor to do it

    Install the "ubiquitous-language" skill from https://github.com/mattpocock/skills for Cursor.
Copy the skill folder (the one containing SKILL.md, with any scripts or reference files next to it) into .cursor/skills/ in this project.
Before copying, show me the SKILL.md and list any scripts it includes, and wait for me to confirm.

    Or copy the folder yourself

    Unzip the download into .cursor/skills/ for this project, or ~/.cursor/skills/ for all your projects.

    Run it by typing / and the skill name in chat.

    Cursor skills docs
  • GitHub Copilot

    Run this in your project

    npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language -a github-copilot

    Add -g to install it for every project instead.

    Or ask GitHub Copilot to do it

    Install the "ubiquitous-language" skill from https://github.com/mattpocock/skills for GitHub Copilot.
Copy the skill folder (the one containing SKILL.md, with any scripts or reference files next to it) into .github/skills/ in this project.
Before copying, show me the SKILL.md and list any scripts it includes, and wait for me to confirm.

    Or copy the folder yourself

    Unzip the download into .github/skills/ for this project, or ~/.copilot/skills/ for all your projects.

    Works in Copilot CLI, the cloud agent and agent mode in VS Code and JetBrains.

    GitHub Copilot skills docs
  • Antigravity

    Run this in your project

    npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language -a antigravity

    Add -g to install it for every project instead.

    Or ask Antigravity to do it

    Install the "ubiquitous-language" skill from https://github.com/mattpocock/skills for Antigravity.
Copy the skill folder (the one containing SKILL.md, with any scripts or reference files next to it) into .agents/skills/ in this project.
Before copying, show me the SKILL.md and list any scripts it includes, and wait for me to confirm.

    Or copy the folder yourself

    Unzip the download into .agents/skills/ for this project, or ~/.gemini/config/skills/ for all your projects.

    Antigravity skills docs
  • Gemini CLI

    Run this in your project

    npx skills add https://github.com/mattpocock/skills --skill ubiquitous-language -a gemini-cli

    Add -g to install it for every project instead.

    Or ask Gemini CLI to do it

    Install the "ubiquitous-language" skill from https://github.com/mattpocock/skills for Gemini CLI.
Copy the skill folder (the one containing SKILL.md, with any scripts or reference files next to it) into .gemini/skills/ in this project.
Before copying, show me the SKILL.md and list any scripts it includes, and wait for me to confirm.

    Or copy the folder yourself

    Unzip the download into .gemini/skills/ for this project, or ~/.gemini/skills/ for all your projects.

    Run /skills to check it was found.

    Gemini CLI skills docs
Installs
204.3K via skills.sh
GitHub
261.4K stars ↗
Last updated
4 Sept 2026
Licence
MIT

Security checks

Run by independent scanners and published on skills.sh. Their results, not a Viberation review.

  • Gen Agent Trust Hub Pass

    The skill is safe to use for its intended purpose of managing a domain terminology glossary. It has a minor vulnerability surface for indirect prompt injection because it stores untrusted conversation data in a local file which is later read back into the agent's context.

    19 May 2026

  • Socket Pass

    No alerts

    19 May 2026

  • Snyk Pass

    Risk: LOW · No issues

    19 May 2026

  • Runlayer Pass

    1 file scanned · No issues

    16 Mar 2026

  • ZeroLeaks Pass

    Score: 93/100 · 2 sections analyzed

    15 Apr 2026
What's inside (2 files)
  • agents/openai.yaml146 chars
  • SKILL.md4.9K chars

SKILL.md, first part. Shown as plain text.

---
name: ubiquitous-language
description: Extract a DDD-style ubiquitous language glossary from the current conversation, flagging ambiguities and proposing canonical terms. Saves to UBIQUITOUS_LANGUAGE.md. Use when user wants to define domain terms, build a glossary, harden terminology, create a ubiquitous language, or mentions "domain model" or "DDD".
disable-model-invocation: true
---

# Ubiquitous Language

Extract and formalize domain terminology from the current conversation into a consistent glossary, saved to a local file.

## Process

1. **Scan the conversation** for domain-relevant nouns, verbs, and concepts
2. **Identify problems**:
   - Same word used for different concepts (ambiguity)
   - Different words used for the same concept (synonyms)
   - Vague or overloaded terms
3. **Propose a canonical glossary** with opinionated term choices
4. **Write to `UBIQUITOUS_LANGUAGE.md`** in the working directory using the format below
5. **Output a summary** inline in the conversation

## Output Format

Write a `UBIQUITOUS_LANGUAGE.md` file with this structure:

```md
# Ubiquitous Language

## Order lifecycle

| Term        | Definition                                              | Aliases to avoid      |
| ----------- | ------------------------------------------------------- | --------------------- |
| **Order**   | A customer's request to purchase one or more items      | Purchase, transaction |
| **Invoice** | A request for payment sent to a customer after delivery | Bill, payment request |

## People

| Term         | Definition                                  | Aliases to avoid       |
| ------------ | ------------------------------------------- | ---------------------- |
| **Customer** | A person or organization that places orders | Client, buyer, account |
| **User**     | An authentication identity in the system    | Login, account         |

## Relationships

- An **Invoice** belongs to exactly one **Customer**
- An **Order** produces one or more **Invoices**

## Example dialogue

> **Dev:** "When a **Customer** places an **Order**, do we create the **Invoice** immediately?"
> **Domain expert:** "No — an **Invoice** is only generated once a **Fulfillment** is confirmed. A single **Order** can produce multiple **Invoices** if items ship in separate **Shipments**."
> **Dev:** "So if a **Shipment** is cancelled before dispatch, no **Invoice** exists for it?"
> **Domain expert:** "Exactly. The **Invoice** lifecycle is tied to the **Fulfillment**, not the **Order**."

## Flagged ambiguities

- "account" was used to mean both **Customer** and **User** — these are distinct concepts: a **Customer** places orders, while a **User** is an authentication identity that may or may not represent a **Customer**.
```

## Rules

- **Be opinionated.** When multiple words exist for the same concept, pick the best one and list the others as aliases to avoid.
- **Flag conflicts explicitly.** If a term is used ambiguously in the conversation, call it out in the "Flagged ambiguities" section with a clear recommendation.
- **Only include terms relevant for domain experts.** Skip the names of modules or classes unless they have meaning in the domain language.
- **Keep definitions tight.** One sentence max. Define what it IS, not what it does.
- **Show relationships.** Use bold term names and express cardinality where obvious.
- **Only include domain terms.** Skip generic programming concepts (array, function, endpoint) unless they have domain-specific meaning.
- **Group terms into multiple tables** when natural clusters emerge (e.g. by subdomain, lifecycle, or actor). Each group gets its own heading and table. If all terms belong to a single cohesive domain, one table is fine — don't force groupings.
- **Write an example dialogue.** A short conversation (3-5 exchanges) between a dev and a domain expert that demonstrates how the terms interact naturally. The dialogue should clarify boundaries between related concepts and show terms being u

Key info

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Category
Skills

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