Conciseness

The body is mostly prescriptive and does not explain concepts Claude already knows, but it is noticeably redundant: the vector-DB-as-retrieval-infrastructure rule appears three times (Control-flow features, Transitions, Guardrail 12), anti-patterns §5 application ownership is restated in three places, and "When to use"/"Intent signature" largely duplicate each other and the description. This fits "mostly efficient but could be tightened" rather than the padded verbosity of a 2.

Actionability

Concrete decision rules exist (enforce 3NF, expand-contract with dual-write and verified read switch, hybrid retrieval default, named Serena tools `find_file`/`search_for_pattern`, pointer to `resources/anti-patterns.md` §5), but the actual executable steps are deferred to `resources/execution-protocol.md`, `resources/checklist.md`, and other files not present in the bundle, so key execution details are missing — matching "some concrete guidance but incomplete".

Workflow Clarity

The Structural Flow (Entry → PREPARE/ACQUIRE/REASON/ACT/VERIFY/FINALIZE → Transitions → Failure and recovery → Exit) gives a clear sequence with explicit verification and failure-handling steps, and destructive live-table changes get validation safeguards (verified read switch, soak window before contract). It stops short of a 5 because two parallel workflow framings (Scenes vs. Default Workflow) coexist without reconciliation and checkpoints are procedural rather than command-level.

Progressive Disclosure

The References section is well-labeled and one level deep, but the bundle contains none of the ten-plus referenced files (`resources/*.md`, `../_shared/core/*`, `../oma-observability/SKILL.md`) — scored against the actual bundle structure, every referenced path is dangling and navigation is unverifiable. Inline content such as the 18-item Guardrails list also belongs in reference files, matching "some structure but could be better organized" rather than the minor-gaps profile of a 4.

Specificity

The description names several concrete actions — "Design schemas and migrations", "tune queries", "plan vector retrieval and database operations" — which is more than the 1-2 actions of a score-3 anchor, but "database operations" is generic and coverage of the skill's full scope (anti-pattern review, capacity, backup) is missing, so it does not reach comprehensive.

Completeness

The "what" is clear (design schemas/migrations, tune queries, plan vector retrieval), but there is no "Use when..." clause or equivalent explicit trigger guidance; the boundary sentence "Application API implementation uses oma-backend" is a negative routing cue, not a when-to-use statement, so completeness is capped at 3 per the judging guidelines.

Trigger Term Quality

Natural trigger terms are present: "schemas", "migrations", "tune queries", "vector retrieval", "database". Common synonyms a user would actually say — "SQL", "ERD", "RAG", "indexing", "backup" — are absent, which keeps it below comprehensive coverage (5) but clearly above partial coverage (3).

Distinctiveness Conflict Risk

The database niche (schemas, migrations, query tuning, vector retrieval) is distinct and the explicit boundary "Application API implementation uses oma-backend" reduces overlap risk with a backend skill. It is not a 5 because "database operations" is broad and only one adjacent-skill boundary is stated.