Role: Domain Modeller SKILL.md skillA

Role: Domain Modeller from jasonwarrenuk/goblin-mode is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.

Install it, pinned
mdr add jasonwarrenuk/goblin-mode/Role: Domain Modeller@git:20261008.c2dff9e

Pins git:20261008.c2dff9e in mdr.lock. Pin the fingerprint instead.

Audit grade
A, 17 of 17 checks passed
Kind
SKILL.md skill
Repository
jasonwarrenuk/goblin-mode
Path
skills/clod-role-domain_modeller/SKILL.md
Versions recorded
7
Latest version
git:20261008.c2dff9e, committed Oct 8, 2026
First version recorded
Aug 12, 2026
Size
7,537 bytes
Repository stars
6
License
none declared

Model-first design: map entities, relationships and boundaries before writing code.

Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.

What the file says

# Domain Modeller

Model-first design skill. Maps entities, relationships and boundaries before code. Prioritises understanding the domain over jumping to implementation. Outputs conceptual models as Mermaid diagrams or Cypher-compatible graph structures.

---

## When This Skill Applies

Use this skill when:
- Designing a new feature, module or system
- The conversation shifts from "what should we build" to "how should we build it"
- Entities and their relationships are unclear or undocumented
- Multiple data stores are involved (polyglot persistence decisions)
- A feature touches multiple parts of the system
- The user says "I'm not sure how this fits together"
- Before writing any significant new code

---

## Core Principle

**Understand the domain before solving it.**

Sophistication is not clever code; it's depth of understanding. A well-modelled domain makes implementation obvious. A poorly modelled domain makes every line of code a fight.

The sequence is always: **Model → Design → Build**

---

## The Modelling Process

### Step 1: Identify Entities

What are the nouns? What things exist in this domain?

**Questions to ask**:
- What are the core objects/concepts?
…

Read the whole file at its exact version.

How to install

The exact contents, by fingerprint
mdr add jasonwarrenuk/goblin-mode/Role: Domain Modeller@sha256:040ed433f885b411

The line at the top of this page pins the label git:20261008.c2dff9e, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_psbf5igiu3ubtgte.svg)](https://markdownregistry.com/a/art_psbf5igiu3ubtgte)

2 badge image fetches in 30 days. What the badge shows.

Versions

The registry has recorded 7 versions of this file, between Aug 12, 2026 and Oct 8, 2026, about one every 9 days.

versioncommittedcommitsizeaudit
git:20261008.c2dff9e latest2026-10-08 c2dff9e 7,537 BA view · diff
git:20260928.6caf1ea2026-09-28 6caf1ea 7,474 BA view · diff
git:20260910.0097f1d2026-09-10 0097f1d 7,449 BA view · diff
git:20260814.769885b2026-08-14 769885b 7,453 BA view · diff
git:20260813.199d7702026-08-13 199d770 7,470 BA view · diff
git:20260813.874484b2026-08-13 874484b 7,440 BA view · diff
git:20260812.cb14bd62026-08-12 cb14bd6 7,453 BA view

Audit of the latest version

A  17 of 17 checks passed. Fixed automatic checks with no AI involved, so the same checks give the same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (7537 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

jasonwarrenuk/goblin-mode · 6 stars · license none declared · pushed 2026-11-06 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_psbf5igiu3ubtgte
GET https://markdownregistry.com/api/v1/resolve?ref=jasonwarrenuk/goblin-mode/Role: Domain Modeller
GET https://markdownregistry.com/api/v1/blob/040ed433f885b4116911b1b39882c246a39aa7547cb043d084dc795ae39254de

Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.

Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.

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