Conciseness

The body is mostly lean and assumes Claude's competence (no explanation of what Chrome or CDP is), but the 'Plate Defaults', 'Rules', and 'Preferred Shape' sections restate the same directives two or three times — persistent profile, dedicated --user-data-dir, macOS 'open -na', and 'do not use the daily Default profile' each appear in at least two sections — and the 'Fallback Setup' section is a one-sentence stub. Not 4 because the duplication is a genuine tightening opportunity, not just a minor instance.

Actionability

The guidance is fully executable and copy-paste ready: install commands, the default connect command, a Python snippet to enumerate Chrome profiles, an rsync profile-clone command with the right Singleton/lockfile exclusions, the macOS launch invocation, curl sanity checks, the WebSocket-URL fallback, and lsof to identify a port thief. Specific examples cover the common cases (default connect, broken CDP endpoint, wrong process on 9222).

Workflow Clarity

The Google Chrome path is a clear 5-step sequence with explicit validation checkpoints (curl /json/version health check, page-title verification, WebSocket-URL fallback) and error-recovery loops (lsof, kill the wrong listener, relaunch). Not 5 because the top-level flow across sections is scattered — the 'Fallback Setup' section is an empty stub with no steps, and the connect-first-then-inspect ordering lives in bullet lists rather than an explicit sequence.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent) and none are referenced, so there is no nested-reference risk; sections are clearly headed and navigable. Not 5 because the body runs ~130 lines with the macOS-specific Local State/rsync/open path inlined — platform-specific setup that would fit a one-level-deep reference file — and the duplicate 'Plate Defaults'/'Rules' sections could be consolidated.

Specificity

The description names the domain ('Fallback browser automation with persistent Chrome state') but lists no concrete actions — no connect, launch, profile-clone, or debug commands — matching the 'names the domain but actions are minimal or generic' anchor. It does not reach 3 because 'persistent Chrome state' is a property, not an action, and there is no second concrete capability stated.

Completeness

It has an explicit 'when' clause ('Use only when Browser Use is unavailable or blocked') and a what ('Fallback browser automation with persistent Chrome state'), satisfying both halves. Not 5 because the 'what' is high-level — it never says concretely what the skill does (connect to a persistent CDP Chrome on 9222, reuse a dedicated debug profile) — and not 3 because both what and when are explicitly present.

Trigger Term Quality

It carries relevant keywords ('browser automation', 'Chrome', 'Browser Use', 'unavailable or blocked') but misses the natural phrases a user would say — CDP, remote debugging, debug browser, scrape/browse a page, sign in, persistent session. Not 4 because common variations and synonyms for this domain are largely absent.

Distinctiveness Conflict Risk

The 'fallback only when Browser Use is unavailable or blocked' guard gives it a clear, narrow niche with minimal wrong-skill trigger risk. Not 5 because the generic phrase 'browser automation' still overlaps with the primary browser skill and other automation tools; no additional distinguishing triggers (e.g., CDP, 9222, persistent profile) appear in the description.