igmarin/ddd-ubiquitous-language
ddd-ubiquitous-language/SKILL.md
Use when a Ruby on Rails feature, bug, or architecture discussion has fuzzy business terminology and you need shared vocabulary. Identifies canonical terms, resolves naming conflicts, maps synonyms to one concept, and generates a glossary for Rails-first workflows. Trigger words: DDD, shared vocabulary, define terms, bounded context naming, what should we call this, terminology alignment, DDD glossary, naming inconsistency.
$ install --global
skillsauthnpx skillsauth add igmarin/rails-agent-skills ddd-ubiquitous-languageInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
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SKILL.md
- name:
- ddd-ubiquitous-language
- license:
- MIT
- description:
- >
- for Rails-first workflows. Trigger words:
- DDD, shared vocabulary, define terms,
DDD Ubiquitous Language
Use this skill when the domain language is fuzzy, overloaded, or inconsistent.
Core principle: Agree on business language before choosing models, services, or boundaries.
Quick Reference
| Topic | Rule | |-------|------| | Canonical term | Pick one business term for one concept | | Synonyms | Capture them, then choose one preferred term | | Overloaded words | Flag them early; split meanings explicitly | | Naming | Prefer business meaning over technical shorthand | | Output | Return a usable glossary, not abstract theory |
HARD-GATE
DO NOT introduce DDD terminology without grounding it in the user's real domain language.
DO NOT rename code concepts until the glossary is explicit enough to justify the change.
ALWAYS flag overloaded or conflicting terms before recommending modeling changes.
When to Use
- The user uses multiple words for what might be the same business concept.
- A feature or bug discussion is blocked by unclear naming.
- You need a glossary before doing boundary review or Rails modeling.
- Next step: Chain to
ddd-boundaries-reviewwhen the glossary reveals multiple contexts, or toddd-rails-modelingwhen the main problem is tactical modeling in Rails.
Process
- Collect terms: Pull candidate nouns, roles, states, events, and actions from the request, PRD, tickets, existing docs, and code names. In a Rails codebase, scan class and file names across layers:
grep -rh "^class \|^module " app/models app/controllers app/services --include="*.rb" | sort - Group synonyms: Identify words that appear to mean the same thing and words that are overloaded across multiple meanings.
- Choose canonical terms: Prefer the clearest business term; keep aliases only as migration notes or search hints.
- Define each term: Write one short definition, expected invariants, and related concepts.
- Flag ambiguity: List terms that need user confirmation or that likely indicate multiple bounded contexts.
- Hand off: Continue with
ddd-boundaries-review,ddd-rails-modeling, orcreate-prd/generate-tasksdepending on the workflow stage.
Output Style
When using this skill, return:
- Canonical term
- Aliases / conflicting words
- Definition
- Key invariant or business rule
- Likely related context
- Open questions
Minimal example (one row):
| Canonical term | Aliases | Definition | Invariant | Context | |----------------|---------|------------|-----------|---------| | Shipment | Parcel, Package | Physical goods sent to a customer address | Must reference a valid Order | Fulfillment |
Open questions: Does "Parcel" ever mean an internal warehouse bin ID? If yes, split into two glossary entries.
See EXAMPLES.md for a full worked glossary example and common mistakes.
Integration
| Skill | When to chain | |-------|---------------| | create-prd | When a PRD needs cleaner business language before approval | | ddd-boundaries-review | When the glossary suggests multiple bounded contexts or language leakage | | ddd-rails-modeling | When the terms are clear enough to decide entities, value objects, and services | | rails-architecture-review | When naming confusion already appears in the code structure |
Assets
- assets/examples.md
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