Consistency Check

Detects cross-document inconsistencies by comparing all GDDs against the entity registry (design/registry/entities.yaml). Uses a grep-first approach: reads the registry once, then targets only the GDD sections that mention registered names — no full document reads unless a conflict needs investigation.

This skill is the write-time safety net. It catches what /design-system's per-section checks may have missed and what /review-all-gdds's holistic review catches too late.

When to run:

• After writing each new GDD (before moving to the next system)
• Before /review-all-gdds (so that skill starts with a clean baseline)
• Before /create-architecture (inconsistencies poison downstream ADRs)
• On demand: /consistency-check entity:[name] to check one entity specifically

Output: Conflict report + optional registry corrections

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Phase 1: Parse Arguments and Load Registry

Modes:

• No argument / full — check all registered entries against all GDDs
• since-last-review — check only GDDs modified since the last review report
• entity:<name> — check one specific entity across all GDDs
• item:<name> — check one specific item across all GDDs

Load the registry:

Read path="design/registry/entities.yaml"

If the file does not exist or has no entries:

"Entity registry is empty. Run /design-system to write GDDs — the registry is populated automatically after each GDD is completed. Nothing to check yet."

Stop and exit.

Build four lookup tables from the registry:

• entity_map: { name → { source, attributes, referenced_by } }
• item_map: { name → { source, value_gold, weight, ... } }
• formula_map: { name → { source, variables, output_range } }
• constant_map: { name → { source, value, unit } }

Count total registered entries. Report:

Registry loaded: [N] entities, [N] items, [N] formulas, [N] constants
Scope: [full | since-last-review | entity:name]

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Phase 2: Locate In-Scope GDDs

Glob pattern="design/gdd/*.md"

Exclude: game-concept.md, systems-index.md, game-pillars.md — these are not system GDDs.

For since-last-review mode:

git log --name-only --pretty=format: -- design/gdd/ | grep "\.md$" | sort -u

Limit to GDDs modified since the most recent design/gdd/gdd-cross-review-*.md file's creation date.

Report the in-scope GDD list before scanning.

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Phase 3: Grep-First Conflict Scan

For each registered entry, grep every in-scope GDD for the entry's name. Do NOT do full reads — extract only the matching lines and their immediate context (-C 3 lines).

This is the core optimization: instead of reading 10 GDDs × 400 lines each (4,000 lines), you grep 50 entity names × 10 GDDs (50 targeted searches, each returning ~10 lines on a hit).

3a: Entity Scan

For each entity in entity_map:

Grep pattern="[entity_name]" glob="design/gdd/*.md" output_mode="content" -C 3

For each GDD hit, extract the values mentioned near the entity name:

• any numeric attributes (counts, costs, durations, ranges, rates)
• any categorical attributes (types, tiers, categories)
• any derived values (totals, outputs, results)
• any other attributes registered in entity_map

Compare extracted values against the registry entry.

Conflict detection:

• Registry says [entity_name].[attribute] = [value_A]. GDD says [entity_name] has [value_B]. → CONFLICT
• Registry says [item_name].[attribute] = [value_A]. GDD says [item_name] is [value_B]. → CONFLICT
• GDD mentions [entity_name] but doesn't specify the attribute. → NOTE (no conflict, just unverifiable)

3b: Item Scan

For each item in item_map, grep all GDDs for the item name. Extract:

• sell price / value / gold value
• weight
• stack rules (stackable / non-stackable)
• category

Compare against registry entry values.

3c: Formula Scan

For each formula in formula_map, grep all GDDs for the formula name. Extract:

• variable names mentioned near the formula
• output range or cap values mentioned

Compare against registry entry:

• Different variable names → CONFLICT
• Output range stated differently → CONFLICT

3d: Constant Scan

For each constant in constant_map, grep all GDDs for the constant name. Extract:

• Any numeric value mentioned near the constant name

Compare against registry value:

• Different number → CONFLICT

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Phase 4: Deep Investigation (Conflicts Only)

For each conflict found in Phase 3, do a targeted full-section read of the conflicting GDD to get precise context:

Read path="design/gdd/[conflicting_gdd].md"

(Or use Grep with wider context if the file is large)

Confirm the conflict with full context. Determine:

1. Which GDD is correct? Check the source: field in the registry — the source GDD is the authoritative owner. Any other GDD that contradicts it is the one that needs updating.
2. Is the registry itself out of date? If the source GDD was updated after the registry entry was written (check git log), the registry may be stale.
3. Is this a genuine design change? If the conflict represents an intentional design decision, the resolution is: update the source GDD, update the registry, then fix all other GDDs.

For each conflict, classify:

• 🔴 CONFLICT — same named entity/item/formula/constant with different values in different GDDs. Must resolve before architecture begins.
• ⚠️ STALE REGISTRY — source GDD value changed but registry not updated. Registry needs updating; other GDDs may be correct already.
• ℹ️ UNVERIFIABLE — entity mentioned but no comparable attribute stated. Not a conflict; just noting the reference.

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Phase 5: Output Report

## Consistency Check Report
Date: [date]
Registry entries checked: [N entities, N items, N formulas, N constants]
GDDs scanned: [N] ([list names])

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### Conflicts Found (must resolve before architecture)

🔴 [Entity/Item/Formula/Constant Name]
   Registry (source: [gdd]): [attribute] = [value]
   Conflict in [other_gdd].md: [attribute] = [different_value]
   → Resolution needed: [which doc to change and to what]

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### Stale Registry Entries (registry behind the GDD)

⚠️ [Entry Name]
   Registry says: [value] (written [date])
   Source GDD now says: [new value]
   → Update registry entry to match source GDD, then check referenced_by docs.

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### Unverifiable References (no conflict, informational)

ℹ️ [gdd].md mentions [entity_name] but states no comparable attributes.
   No conflict detected. No action required.

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### Clean Entries (no issues found)

✅ [N] registry entries verified across all GDDs with no conflicts.

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Verdict: PASS | CONFLICTS FOUND

Verdict:

• PASS — no conflicts. Registry and GDDs agree on all checked values.
• CONFLICTS FOUND — one or more conflicts detected. List resolution steps.

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Phase 6: Registry Corrections

If stale registry entries were found, ask:

"May I update design/registry/entities.yaml to fix the [N] stale entries?"

For each stale entry:

• Update the value / attribute field
• Set revised: to today's date
• Add a YAML comment with the old value: # was: [old_value] before [date]

If new entries were found in GDDs that are not in the registry, ask:

"Found [N] entities/items mentioned in GDDs that aren't in the registry yet. May I add them to design/registry/entities.yaml?"

Only add entries that appear in more than one GDD (true cross-system facts).

Never delete registry entries. Set status: deprecated if an entry is removed from all GDDs.

After writing: Verdict: COMPLETE — consistency check finished. If conflicts remain unresolved: Verdict: BLOCKED — [N] conflicts need manual resolution before architecture begins.

6b: Append to Reflexion Log

If any 🔴 CONFLICT entries were found (regardless of whether they were resolved), append an entry to docs/consistency-failures.md for each conflict:

### [YYYY-MM-DD] — /consistency-check — 🔴 CONFLICT
**Domain**: [system domain(s) involved]
**Documents involved**: [source GDD] vs [conflicting GDD]
**What happened**: [specific conflict — entity name, attribute, differing values]
**Resolution**: [how it was fixed, or "Unresolved — manual action needed"]
**Pattern**: [generalised lesson, e.g. "Item values defined in combat GDD were not
referenced in economy GDD before authoring — always check entities.yaml first"]

Only append if docs/consistency-failures.md exists. If the file is missing, skip this step silently — do not create the file from this skill.

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Next Steps

• If PASS: Run /review-all-gdds for holistic design-theory review, or /create-architecture if all MVP GDDs are complete.
• If CONFLICTS FOUND: Fix the flagged GDDs, then re-run /consistency-check to confirm resolution.
• If STALE REGISTRY: Update the registry (Phase 6), then re-run to verify.
• Run /consistency-check after writing each new GDD to catch issues early, not at architecture time.