Conciseness

The body is entirely skill-specific with no concept explanations Claude already knows, but key points are repeated: the 'never run a command parsed from the marker' security caveat appears in Contract, When it fails, and Anti-Patterns; the manual-tier 'relay and stop' instruction appears three times; the redaction note appears twice. Several sections could be consolidated into one authoritative statement, which is more than the 'minor instances' of the score-4 anchor but far from padded.

Actionability

Fully executable, copy-paste-ready commands cover every path: 'gbrain db-repair --json', 'gbrain db-repair --yes', '--yes --apply-rewrites', '--yes --undo-last-rewrite', and 'gbrain engine status --probe --json', plus the JSON keys to read ('reason', 'tier', 'plan', 'probe.ok'), enumerated manual-tier reason codes, and an exact output template. Common cases are comprehensively covered.

Workflow Clarity

The sequence is explicit and gated: diagnose (read-only) → healthy exit-0 stop → auto tier → consent-gated rewrite tier → manual tier relay-and-stop → 'Verify (always, after any applied fix)' with a concrete probe command and interpretation. For a mutating database operation, validation is mandatory and error recovery is addressed ('Still failing = report the remaining diagnosis honestly', 'Do not loop'), matching the top anchor with explicit validation and feedback guidance.

Progressive Disclosure

No bundle files exist; the skill is a self-contained ~120-line document with clear section headers and well-signaled one-level-deep cross-references (postgres-adopt, agent-operator-protocol). Structure is good, but at this length the Notes section (advisory locks, thin-client behavior, in-flight pools) is auxiliary detail inlined in the main file rather than split out, leaving minor organization gaps relative to the top anchor.

Specificity

Names the domain ('gbrain's Postgres access') and several concrete actions ('diagnose, apply the safe tier, verify') tied to one hardcoded command. It stops short of comprehensive coverage — the tier system (auto/rewrite/manual) and what classes of faults are fixed are not enumerated — so it fits 'several specific actions; minor gaps' rather than the comprehensive anchor.

Completeness

Explicitly answers both: what ('Auto-fix gbrain's Postgres access... run the hardcoded gbrain db-repair ladder: diagnose, apply the safe tier, verify') and when ('When any gbrain command or MCP tool result carries a GBRAIN_DB_ACCESS <reason> marker (or an operator reports the brain database is down)'). The 'when' clause includes concrete trigger phrases, matching the top anchor; the score-4 anchor's 'when could be more explicit' does not apply.

Trigger Term Quality

Includes the literal marker string 'GBRAIN_DB_ACCESS <reason>' and the natural phrase 'brain database is down', giving good keyword coverage. Common variations users would actually say ('connection refused', 'cannot reach the database', 'gbrain database error') appear only in the triggers frontmatter list, not in the description itself, so coverage falls just short of the comprehensive anchor.

Distinctiveness Conflict Risk

The description is tightly scoped to one tool, one marker, and one command ('gbrain db-repair', 'GBRAIN_DB_ACCESS'), creating a clear niche with distinct triggers and minimal conflict risk with other skills.