Conciseness

The body does not teach concepts Claude already knows, but it is noticeably redundant: three overlapping workflow schemes (Scenes, Structural Flow, Default Workflow), the vector-DB-as-retrieval-infrastructure rule stated twice (Control-flow features and guardrail 12), and the anti-pattern §5 "existing usage" sentence repeated nearly verbatim in the workflow path and guardrail 18; the SSL-primitive table adds tokens without actionable value.

Actionability

Some guidance is concrete (expand-contract steps, "measure, explain, nominate the dominant cost node, then optimize and re-measure"), but most of the body describes deliverables abstractly ("Produce external/conceptual/internal schema documentation") with no inline commands, sample DDL, or example artifacts; all how-to detail is deferred to resources/ files.

Workflow Clarity

Sequencing is clear (Entry → PREPARE/ACQUIRE/REASON/ACT/VERIFY/FINALIZE → Exit, plus Explore/Design/Optimize) and validation checkpoints exist for destructive operations (VERIFY scene, pre-handoff checklist, expand-contract with soak window and separate deploy, "should not execute risky migrations without explicit user intent and verification"), so the destructive-ops cap does not apply; the three overlapping workflow schemes leave minor gaps that keep it below 5.

Progressive Disclosure

A well-signaled References section lists one-level-deep pointers each labeled with its purpose ("Self-check (run before handoff)", "Live migration playbook", etc.) and the body appropriately stays at overview level per domain; however, the 18-guardrail policy block is heavy for the main file and none of the referenced resources/*.md or ../_shared files exist in the provided bundle, so navigation cannot be fully verified.

Specificity

"Design schemas and migrations, tune queries, or plan vector retrieval and database operations" lists several concrete actions, but coverage has minor gaps (indexing, capacity, anti-pattern review are handled by the skill yet unmentioned).

Completeness

The "what" is clear (design, tune, plan database work), but there is no "Use when..." clause or equivalent explicit trigger guidance; the oma-backend sentence is a routing boundary, not a when-to-use trigger, which caps completeness at 3.

Trigger Term Quality

Natural keywords like "schemas", "migrations", "tune queries", "vector retrieval", and "database" are present and would be said by users, but common variations such as ERD, SQL, NoSQL, indexing, RAG, or "vector database" are missing.

Distinctiveness Conflict Risk

The database design/tuning niche is mostly distinct and the explicit "Application API implementation uses oma-backend" routing reduces overlap risk; the broad phrase "database operations" keeps minor overlap risk with backend/infra skills.