Conciseness

The body is dense with product-specific contracts Claude cannot know (`AgentSidebar`, `sendToAgentChat`, the settings page-id catalog, `defineDesignSystem` seam rules) and explains no general concepts, so most tokens earn their place. Minor trimming exists: the opening paragraph restates the frontmatter trigger list verbatim, and 'Discover Before Building' overlaps Implementation Checklist steps 1, 6, and 7. This fits the 4 anchor ('minor instances of over-explanation that could be trimmed') rather than 3, since no section is padded or teaches known material.

Actionability

For an instruction-only skill the guidance is concrete: exact commands (`agent-native eject --list`, `docs-search`, `source-search`), API signatures (`buildSettingsRoute(page, sub?, { anchor? })`, `registerRequiredSecret({ kind: "api-key" })`, `resolveWorkspaceConnectionCredential(s)ForApp`), named files (`packages/core/src/navigation/settings-redirects.ts`, `app/design-system.ts`), and named components (`ChatHistoryRail`, `AgentTabsPage`). It stops short of the 5 anchor because there are no usage examples or snippets for the key APIs and some rules remain abstract ('Keep shell and component tokens semantic').

Workflow Clarity

'Discover Before Building' (4 ordered steps) and the 'Implementation Checklist' (9 ordered steps) are clearly sequenced, and verification checkpoints appear: step 9's conformance-kit check across two adapters plus 'verify an AI handoff produces no stale-index console error'. The skill's operations are decision/refactor guidance rather than destructive or batch operations, so no validation cap applies, but there is no error-recovery loop (what to do when the conformance kit or handoff check fails), which keeps it at 4 rather than 5.

Progressive Disclosure

The entire skill lives in one ~265-line SKILL.md with no references/, scripts/, or assets/ bundle at all. Headers are clear, but catalog material that reads like separate-file reference content is fully inlined: the settings page-id tree, the 14-entry Reusable Kits list, and the Agent Surface Contract. This matches the 3 anchor ('content that should be separate is inline') exemplified by 200 lines of API reference inside the main file; it does not reach 4 because there is no split at all, only cross-skill pointers. The under-50-lines exception does not apply at this length.

Specificity

The description names its domain precisely ('shared Agent-Native workspace UI') and states two functions ('Inventory and ownership rules'), but these are abstract categories rather than the multiple concrete, verbatim actions of a 4-5 anchor. It is a clear what-statement, just not an enumeration of concrete capabilities.

Completeness

Both halves are explicit: the what ('Inventory and ownership rules for shared Agent-Native workspace UI') and the when ('Use before building app chrome, settings, navigation, sharing, collaboration, setup, history, comments, chat rails, agent UX, or repeated workspace behavior'). The when-clause lists concrete trigger areas, matching the 5 anchor; it does not rely on implication like the 4 anchor's 'when could be more explicit'.

Trigger Term Quality

'app chrome, settings, navigation, sharing, collaboration, setup, history, comments, chat rails, agent UX' gives good natural-phrase coverage a developer would actually say before building workspace UI. It falls short of the 5 anchor because several entries lean product-jargon ('chat rails', 'app chrome') and no synonyms or extensions are offered for them.

Distinctiveness Conflict Risk

The first sentence carves a niche (ownership rules for Agent-Native workspace UI), but the trigger list includes 'sharing', 'settings', 'history', 'comments', and 'collaboration', which overlap with the dedicated sibling skills the body itself names (`sharing`, `audit-log`, `real-time-collab`). A user asking to build a sharing surface would plausibly trigger both this and the more specific skill, fitting the 'somewhat specific but could still overlap' anchor rather than the 'minor overlap risk' of 4.