Ubiquitous Language

Mine the live conversation for domain-relevant nouns, verbs, and concepts; resolve synonyms and overloaded terms into a canonical, opinionated glossary. Persist the result to UBIQUITOUS_LANGUAGE.md so subsequent sessions inherit the same vocabulary. Re-invocation refines the file in place rather than overwriting.

When a candidate term collides with usage already present in the codebase, dispatch an Explore agent (fd-first discovery, git grep/ast-grep content search) to confirm the dominant naming before recommending a winner. The user supplies domain intent; the codebase supplies factual usage.

Modality vs adjacent skills: This skill extracts glossary from raw conversation when no documented domain language exists yet. Domain-model grilling grills a plan against an already-documented CONTEXT.md/ADRs. Pick ubiquitous-language when you are creating the artifact; pick the grilling workflow when you are stress-testing one. The two compose: build the glossary here, then promote stable terms into CONTEXT.md and let the grilling workflow defend it thereafter.

Process

1. Scan the dialogue for domain-relevant nouns, verbs, and concepts. Skip generic programming nouns (array, function, endpoint) unless they carry domain weight.
2. Identify three failure modes: same word for different concepts (ambiguity), different words for the same concept (synonyms), vague or overloaded terms.
3. Propose canonical terms with explicit aliases-to-avoid. Be opinionated — pick one winner per concept and justify briefly.
4. Persist UBIQUITOUS_LANGUAGE.md to the working directory using the format in references/UBIQUITOUS-LANGUAGE-FORMAT.md.
5. Emit a short inline summary of additions, renames, and flagged ambiguities so the user can react in-thread.

Rules

• One sentence per definition. Define what the term is, not what it does.
• Group terms into multiple tables when natural clusters exist (subdomain, lifecycle, actor). Force no grouping when a single cohesive table reads cleanly.
• Express relationships with bold term names and explicit cardinality where obvious (exactly one, one or more, optional).
• Flagged ambiguities require a recommendation, not a question. The skill resolves; the user overrides.
• Treat module and class identifiers as glossary candidates only when they carry domain meaning. Prefer abstract domain terms over implementation aliases.
• Include an example dialogue (3–5 exchanges) demonstrating the terms used precisely. The dialogue clarifies boundaries between adjacent concepts.

Re-invocation

When invoked again in the same conversation:

1. Read the existing UBIQUITOUS_LANGUAGE.md.
2. Incorporate new terms surfaced since the last pass.
3. Update definitions when shared understanding has shifted; preserve the old wording in commit history rather than the file body.
4. Re-flag any new ambiguities; demote resolved ambiguities to a closed note or remove them once the glossary stabilises.
5. Refresh the example dialogue so it exercises the latest term set.

Reference materials

• references/UBIQUITOUS-LANGUAGE-FORMAT.md — table layout, relationship syntax, dialogue template, flagged-ambiguities format. Language-agnostic.