Conciseness

The body is dense with project-specific knowledge Claude cannot know (ownableColumns, accessFilter semantics, registration flags) with no general-concept filler, but a few passages could be trimmed: the "Make me an admin" digression about auth hooks, the "Analytics (follow-up)" status note, and the flag-name backward-compatibility parenthetical. This matches 'efficient; minor instances of over-explanation that could be trimmed'; not 5 because those digressions are genuinely off-skill, not 3 because there is no padded filler of the anchor-3 kind.

Actionability

Copy-paste-ready, complete code blocks with imports cover every common case: schema definition with ownableColumns/createSharesTable, registerShareableResource, accessFilter query, assertAccess guard, owner-setting insert with the authentication check, and ShareButton/VisibilityBadge usage. The auto-mounted actions table and the 8-step migration checklist add fully executable guidance; nothing is pseudocode.

Workflow Clarity

Sections follow the build order (make ownable → filter reads → guard writes → set owner → drop in UI) and the migration pattern is an explicit numbered checklist; the Debugging section provides error-recovery feedback loops ("ForbiddenError from an action means the current user isn't owner / hasn't been shared", "check that the insert actually set owner_email"). Not 5 because the main creation flow has no explicit verify step after registration before moving on; not 3 because checkpoints and recovery guidance are present for the fragile steps.

Progressive Disclosure

The single ~290-line SKILL.md has no bundle files at all, and detailed material is inlined that clearly belongs in separate reference files — the 'Standard share surface' UI contract, the full actions table, the migration pattern, and the admin-role discussion. Internal structure and headers are good and external pointers are clearly signaled ("see the `authentication` skill", "`/docs/deployment#email-templates`"), so this is not a 2 (no unstructured wall), but 'content that should be separate is inline' caps it at 3; 4 would require the bulk of detail to live outside SKILL.md.

Specificity

The description lists several concrete actions — "making a resource table ownable, wiring list/read/update access checks, or dropping the standard share dialog into a template" — matching the anchor for several specific actions with minor gaps. Not 5 because coverage is incomplete (visibility levels, share roles, and the standard share actions are unmentioned); not 3 because it goes beyond 1-2 actions with concrete targets.

Completeness

It explicitly answers both what ("Framework-level sharing and privacy for user-authored resources (dashboards, documents, forms, decks, etc.)") and when ("Use when making a resource table ownable, wiring list/read/update access checks, or dropping the standard share dialog into a template") with concrete trigger phrases. This matches the top anchor exactly; the neighboring anchor 4 would require a weaker or less explicit 'when' clause.

Trigger Term Quality

Natural phrases a user would say are present — "sharing", "privacy", "access checks", "share dialog" — giving good keyword coverage. Not 5 because common synonyms such as "permissions", "visibility", or "grant" are missing; not 3 because more than some relevant keywords are covered, including natural task phrasings.

Distinctiveness Conflict Risk

Distinct triggers like "share dialog", "ownable", and "list/read/update access checks" carve a fairly clear niche with only minor overlap risk against a sibling authentication/permissions skill. Not 5 because "sharing and privacy" is broad enough to collide with a general permissions skill; not 3 because the framework-level framing and UI triggers make confusion unlikely.