Ubiquitous Language

Extract and formalize domain terminology into a consistent glossary, stored in the brain vault.

"If developers and domain experts use different terms for the same concept, bugs hide in the translation."

IMPORTANT: This plugin uses .flux/ for ALL task tracking. Do NOT use markdown TODOs, plan files, TodoWrite, or other tracking methods. All task state must be read and written via fluxctl.

CRITICAL: fluxctl is BUNDLED — NOT installed globally. which fluxctl will fail (expected). Always use:

PLUGIN_ROOT="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}}"
[ ! -d "$PLUGIN_ROOT/scripts" ] && PLUGIN_ROOT=$(ls -td ~/.claude/plugins/cache/nairon-flux/flux/*/ 2>/dev/null | head -1)
FLUXCTL="${PLUGIN_ROOT}/scripts/fluxctl"
$FLUXCTL <command>

Session Phase Tracking

On entry, set the session phase:

$FLUXCTL session-phase set ubiquitous_language

On completion, reset:

$FLUXCTL session-phase set idle

Agent Compatibility: This skill works across Codex, OpenCode, and legacy Claude environments. See agent-compat.md for tool differences.

Input

Full request: $ARGUMENTS

Process

1. Gather Terms

Scan two sources for domain terminology:

From conversation: Identify domain-relevant nouns, verbs, and concepts discussed so far.

From codebase: Explore models, types, and naming conventions:

# Check for existing glossary
cat .flux/brain/business/glossary.md 2>/dev/null
# Look at domain models

Use Glob and Grep to find:

• Model/entity definitions (database schemas, TypeScript types, class definitions)
• API route names and parameters
• UI labels and copy
• Variable names in core business logic

2. Identify Problems

• Ambiguity: Same word used for different concepts (e.g., "account" meaning both a user login and a billing entity)
• Synonyms: Different words for the same concept (e.g., "customer", "client", "buyer" all meaning the same thing)
• Vague terms: Overloaded words that mean different things in different contexts

3. Propose Canonical Glossary

For each concept, pick one canonical term. Be opinionated — the value is in making a clear choice, not listing options.

4. Write to Brain Vault

Write or update .flux/brain/business/glossary.md:

# Ubiquitous Language

## [Domain Area 1]

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

## [Domain Area 2]

| Term | Definition | Aliases to avoid |
|------|-----------|-----------------|
| ... | ... | ... |

## 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."

## Flagged Ambiguities

- "account" was used to mean both **Customer** and **User** — these are distinct concepts

5. Confirm

After writing, state:

I've written/updated .flux/brain/business/glossary.md. From this point forward I will use these terms consistently. If I drift from this language or you notice a term that should be added, let me know.

Rules

• Be opinionated. Pick the best term, list others as aliases to avoid.
• Flag conflicts explicitly. If a term is ambiguous, call it out with a clear recommendation.
• 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 unless they have domain-specific meaning.
• Group terms when natural clusters emerge (by subdomain, lifecycle, or actor).
• Write an example dialogue (3-5 exchanges) showing terms used precisely.

Re-running

When invoked again:

1. Read existing .flux/brain/business/glossary.md
2. Incorporate new terms from subsequent discussion
3. Update definitions if understanding has evolved
4. Mark changed entries with "(updated)" and new entries with "(new)"
5. Re-flag any new ambiguities
6. Rewrite the example dialogue to incorporate new terms

Update Check (End of Command)

ALWAYS run at the very end of /flux:ubiquitous-language execution:

PLUGIN_ROOT="${DROID_PLUGIN_ROOT:-${CLAUDE_PLUGIN_ROOT:-$(git rev-parse --show-toplevel 2>/dev/null || pwd)}}"
[ ! -d "$PLUGIN_ROOT/scripts" ] && PLUGIN_ROOT=$(ls -td ~/.claude/plugins/cache/nairon-flux/flux/*/ 2>/dev/null | head -1)
UPDATE_JSON=$("$PLUGIN_ROOT/scripts/version-check.sh" 2>/dev/null || echo '{"update_available":false}')
UPDATE_AVAILABLE=$(echo "$UPDATE_JSON" | jq -r '.update_available')
LOCAL_VER=$(echo "$UPDATE_JSON" | jq -r '.local_version')
REMOTE_VER=$(echo "$UPDATE_JSON" | jq -r '.remote_version')

If update available, append to output:

---
Flux update available: v${LOCAL_VER} → v${REMOTE_VER}
Update Flux from the same source you installed it from, then restart your agent session.
---

If no update: Show nothing (silent).

Gotchas

• The glossary lives in .flux/brain/business/glossary.md, not a standalone file. This integrates with flux-propose and other skills that read business context.
• If .flux/brain/business/ doesn't exist yet, create it.
• Don't confuse this with code-level naming conventions. This is about domain language — what things are called in the business, not what variables are named.
• The glossary is a living document. It should be updated as the domain understanding evolves, not treated as a one-time artifact.