Conciseness

The workflow, N+1 patterns (includes vs eager_load distinction), and Sidekiq template (retry: 3, dead: false, don't re-raise RecordNotFound) convey non-obvious project conventions that earn their tokens. However, the ~25-line Strong Parameters controller template is standard Rails that Claude already generates unaided — a minor instance of over-explanation that could be trimmed. Not 5 because of that boilerplate; not 3 because the rest is efficient and assumes competence.

Actionability

Fully executable throughout: concrete commands ("rails generate model User name:string email:string", "rails db:migrate", "bundle exec rspec", "bundle exec rubocop") and copy-paste-ready code blocks with real file paths (app/views/posts/index.html.erb, app/jobs/send_welcome_email_job.rb, app/controllers/posts_controller.rb) covering the common cases for each sub-domain. Not 4: no gaps in the guidance — Action Cable and RSpec detail is explicitly delegated to reference files rather than left vague.

Workflow Clarity

The six-step Core Workflow has a clear sequence with explicit validation checkpoints ("must pass" for rspec, rubocop for style, schema verification via db:schema:dump) and genuine feedback loops: migration failure → inspect db/schema.rb → db:rollback → fix and retry, and spec failure → fix examples → re-run with --format documentation, plus N+1 remediation during review. Matches the anchor-5 example of validate-fix-retry loops.

Progressive Disclosure

The Reference Guide table (Topic | Reference | Load When) cleanly signals all five one-level-deep references, all of which exist on disk and contain no further nested .md references. The body stays a lean overview with only high-frequency patterns inline, matching the anchor-5 structure of well-signaled, appropriately split content.

Specificity

Lists five concrete, technique-specific actions — "optimizes Active Record queries with includes/eager_load", "implements Turbo Frames and Turbo Streams", "configures Action Cable for WebSocket connections", "sets up Sidekiq workers", "writes comprehensive RSpec test suites" — comprehensively covering the skill's claimed domains. Not 4: the coverage leaves no minor gaps; each action names the concrete mechanism.

Completeness

Explicitly answers both questions: what (five named capabilities with techniques) and when ("Use when building Rails 7+ web applications with Hotwire, real-time features, or background job processing" plus "Invoke for Active Record optimization, Turbo Frames/Streams, Action Cable, Sidekiq, RSpec Rails"). Matches the anchor-5 example structure of concrete what + explicit trigger phrases.

Trigger Term Quality

Covers the natural vocabulary Rails developers actually use across every sub-domain: "Rails 7+", "Hotwire", "Turbo Frames", "Turbo Streams", "Action Cable", "Active Record", "Sidekiq", "RSpec Rails", "background job processing", "real-time features". Not 4: no meaningful natural synonym is missing — these terms plus the 'Use when'/'Invoke for' phrasing capture how users would ask.

Distinctiveness Conflict Risk

Action Cable, Turbo Frames, Sidekiq, and RSpec Rails are unambiguously Rails-only triggers with minimal conflict risk, but "optimizes Active Record queries" / "Invoke for Active Record optimization" overlaps a generic database-optimizer skill (which the metadata itself lists as related-skills). Anchor 4 ("mostly distinct; minor overlap risk with closely related skills") fits better than 5 because that one capability could fire the wrong skill.