Conciseness

The body is dense and almost entirely GRDB/version-specific material Claude cannot reliably recall (e.g. the 7.11.0 INTEGER-primary-key bug, 0xDEAD10CC) with little padding of basics. Not a 5 because some explanatory prose around why WAL/suspension-defense matter could be trimmed, and the ~370-line length, while justified by 11 patterns, has a few compressible passages.

Actionability

Every pattern supplies concrete grep regexes, explicit Read-verification steps, and copy-paste-ready fixes (e.g. 'execute(sql: "WHERE id = ?", arguments: [id])', 'CREATE INDEX idx_book_author ON book(author_id);', 'try db.execute(sql: "PRAGMA optimize=0x10002")'), covering the common cases fully.

Workflow Clarity

Phases 1–5 are clearly sequenced with explicit validation gates — framework gating before detection ('false positives are worse than missed findings'), 'use Read to verify ... before reporting', the 'If Library is Neither: stop' checkpoint, false-positive and output-limit guards, and error-handling guidance ('report an unresolvable GRDB version as LOW-confidence ... not as a clean pass').

Progressive Disclosure

Internal section structure is clean (phases, numbered patterns, tables) and external references are clearly signaled inline and in a Related section ('See axiom-data (skills/grdb-performance.md) §6'). Not a 5 because no bundle files exist and everything lives in one ~370-line monolith; the detailed pattern catalog could arguably be split into reference files, though the operating-procedure content is appropriately inline.

Specificity

Lists several concrete trigger activities — 'GRDB performance review, slow GRDB queries, app-group database setup audit, a ValueObservation that stopped updating, or pre-release GRDB scan' — each naming a specific audit scenario rather than vague language. Not a 5 because it frames these as when-to-use triggers rather than explicitly stating the detection capabilities the skill performs.

Completeness

The 'when' is exemplary and explicit ('Use when the user mentions ...'), and the trigger activities imply the 'what' (auditing GRDB performance). Not a 5 because there is no explicit capability verb ('Detects/Audits ...') — the 'what' is conveyed only through the trigger list.

Trigger Term Quality

Natural user phrasing is well covered: 'slow GRDB queries' and 'a ValueObservation that stopped updating' are phrases a developer would actually say. Not a 5 because synonyms (e.g., 'SQLite', 'DatabaseQueue locking') and the direct agent command are absent from the description.

Distinctiveness Conflict Risk

GRDB is a narrow, specific Swift/SQLite niche and the triggers (slow queries, ValueObservation staleness, app-group setup audit) are distinctly performance/correctness-shaped, giving minimal conflict risk with sibling auditors.