Conciseness

Efficient with tables and copy-paste commands, assuming Claude's competence throughout. Not 5: there is minor redundancy — the opening line 'Identify database file formats via signature detection' restates the frontmatter description, and the CLI Reference section repeats the --json/--list-formats flags already demonstrated in Quick Start. Not 3: these are trimmable instances, not unnecessary explanations of concepts Claude already knows.

Actionability

Mostly executable, concrete guidance — runnable commands ('python scripts/db_identify.py unknown.db --json', '--list-formats') with realistic sample output for both human and JSON modes. Not 5: the Typical Workflow section uses an inconsistent, non-executable path ('python db_identify.py' missing the 'scripts/' prefix), a small gap that breaks copy-paste readiness.

Workflow Clarity

This is a simple, single-purpose skill and the single action is unambiguous — run the script on a file, optionally with --json, then hand results to db-router; the 'Typical Workflow' section makes the identify-then-route sequence explicit. Not 4: no validation checkpoints are needed for this read-only, non-destructive, non-batch operation, so the simple-skill exception applies fully.

Progressive Disclosure

Well-organized single-page overview with clearly sectioned Quick Start, Output, Detection Methods, Supported Formats, and CLI Reference; its one bundle file (scripts/db_identify.py) exists and is referenced one level deep by exact path. Not 4: for a skill of this size nothing inlined belongs in a separate file, and navigation is trivial — no organization gaps remain.

Specificity

Lists multiple concrete actions — 'scanning magic bytes and file signatures', 'Returns format type, version, confidence level, and DBeaver CLI compatibility' — with comprehensive coverage of what the skill does and its boundary ('Pure identification only... pass results to db-router'). Not 4: coverage is comprehensive and every clause names a concrete capability rather than having minor gaps.

Completeness

Explicitly answers 'what' (identifies formats via magic-byte scanning; returns type, version, confidence, DBeaver compatibility) and 'when' ('Use FIRST when encountering any unknown database file') with a concrete trigger phrase, plus routing handoff guidance. Not 4: the 'when' clause is explicit and specific, matching the anchor-5 example structure rather than a vague 'Use when working with databases'.

Trigger Term Quality

Has relevant domain keywords ('database file formats', 'unknown database file', 'magic bytes', 'file signatures') but misses common variations and synonyms users would naturally say — no file extensions (.db, .sqlite, .mdb, .accdb), no 'detect'/'determine' phrasing. Not 4: keyword coverage is decent but the missing extensions and synonyms are exactly the gap the 3-vs-4 boundary turns on; not 2 since it is far more than one or two generic keywords.

Distinctiveness Conflict Risk

Clear niche — pure format identification — with an explicit boundary against a sibling skill ('for routing decisions, pass results to db-router'), minimizing overlap risk. Not 4: it does not merely reduce overlap risk; it actively delineates its scope from the related skill.