Conciseness

The ~35-line body is lean and assumes Claude's competence — no explanation of what Turbo, Stimulus, or Rails are; it explicitly declines to restate the gem's README ('This skill does not restate it') and spends tokens only on non-obvious, project-specific facts like the turbo-form Stimulus controller being 'unrelated to the turbo_form gem despite the name'.

Actionability

Guidance is executable end-to-end: a concrete install command ('bin/rails generate turbo_form:install'), a copy-paste route snippet (resources :materials, concerns: :turbo_form), a complete slim form example with dynamic: true and dynamic_trigger: true, and a specific deletion list for the superseded turbo_fetch pattern, with pointers to dynamic_action: and expect_dynamic_form_request in the README.

Workflow Clarity

This is a single-purpose skill whose core action is unambiguous (use turbo_form with dynamic: true and a dynamic_trigger input), and each scenario — setup, new form shape, converting legacy turbo_fetch code — carries a clear directive with no gaps; no risky destructive or batch operation requires an explicit validation checkpoint here.

Progressive Disclosure

Under 50 lines with no need for bundled files, it is organized into well-labeled sections (Setup, Shape, Existing turbo_fetch code) and delegates all API detail to a clearly signaled one-level reference — the gem's README — rather than inlining it.

Specificity

The description enumerates concrete capability patterns — 'cascading or dependent dropdowns, conditional fields and sections, option lists that depend on another field, STI type switches' — comprehensively covering the dynamic-form domain with no visible gaps, matching the anchor for multiple specific concrete actions with comprehensive coverage.

Completeness

It explicitly answers both 'what' (build dynamic forms with the turbo_form gem) and 'when' via a concrete 'Use when...' clause covering three trigger scenarios (no full page reload, adding/changing a dynamic form, touching existing turbo_fetch wiring) — the anchor-5 pattern.

Trigger Term Quality

It includes natural phrases users would actually say ('cascading dropdown', 'dependent dropdown', 'conditional field', 'dynamic form', 'update without a full page reload') plus synonym variants and the technical identifiers (turbo_form, turbo_fetch, turbo-form/turbo-fetch Stimulus wiring), giving comprehensive coverage rather than 'a few natural terms missing'.

Distinctiveness Conflict Risk

It occupies a clear niche (dynamic forms via the turbo_form gem in a Rails context) with distinct, specific triggers; overlap risk with generic form or PDF-style skills is minimal.