Conciseness

Every sentence is operational policy — widget directives, endpoints, and guardrails — with zero explanation of concepts Claude already knows (no OAuth primer, no library introductions). Apparent repetition (e.g., 'as its own paragraph') occurs in distinct contexts serving different flows, so nothing reads as padding. Not 4: there is no over-explanation to trim.

Actionability

Fully executable: a copy-paste-ready JS `apps()` helper with auth headers and error handling, exact endpoints ('toolkits', 'connections', 'tools?' + URLSearchParams, 'authorize', 'execute'), exact widget directives ('::connect-apps{}', '::link-slack-account{}', '::add-to-slack{}'), and concrete field names (discovered.slug, accountId, discovered.version). Covers the common web-chat and Slack-conversation cases.

Workflow Clarity

Clear numbered 5-step API sequence plus an explicit first-reply decision flow when an app is missing. Validation checkpoints are explicit: poll 'connections' and only claim success once the account ID is listed, inspect 'successful' and 'error' rather than HTTP status, and never auto-retry uncertain writes; drafts-remain-drafts guards the destructive send/delete operations. This satisfies the feedback-loop requirement for write operations.

Progressive Disclosure

No bundle files exist and none are needed: the ~53-line body is organized under clear section headers (setup widget, missing-app flow, backend API) with all content appropriately inline. Per the rubric's simple-skill note, a short self-contained skill with well-organized sections and no external references earns full marks.

Specificity

Lists several concrete actions ('Show the app connection picker or setup widget', 'app discovery, consent, and execution without exposing project keys'), though the backend capabilities are named as domain nouns rather than distinct actions and coverage has minor gaps (e.g., checking connection status, per-app linking). Not 3 (more than 1-2 actions named) and not 5 (not comprehensive).

Completeness

Explicitly answers both questions: what ('Show the app connection picker or setup widget... Use QM's authenticated backend for app discovery, consent, and execution') and when ('when users ask to connect apps, reopen setup, or need an app that isn't connected yet') with concrete trigger phrases. Uses third-person voice as required.

Trigger Term Quality

Includes natural phrases users would say: 'connect apps', 'reopen setup', 'need an app that isn't connected yet'. A few natural terms are missing, such as 'integrations', 'link account', and specific app names (Slack, Gmail, Notion).

Distinctiveness Conflict Risk

'QM's authenticated backend', 'app connection picker', and 'project keys' establish a clear niche with distinct triggers, with only minor overlap risk against generic OAuth/integration-connection skills.