Conciseness

The body is lean and dense — no explanation of Rails basics, a compact symptom→cause→fix gotchas table, and every section earning its place — but the version-sensitive prerequisite section (rolemodel_rails >= 2.4.0 plus an inline temporary fallback module) is time-sensitive material not placed in a deprecation/old-patterns section, holding it below the 'every token earns its place' anchor. It is well above 'mostly efficient with some unnecessary explanation' (3).

Actionability

All guidance is fully executable and copy-paste ready: complete model, routing, and controller code; a runnable version check (`bundle info rolemodel_rails`); a working type-allowlist guard; and a concrete `params.expect` strong-params example. Specific examples cover the common cases, matching the top anchor.

Workflow Clarity

The pattern is sequenced clearly (prerequisite check → models → routing → controller → views → type guarding) with an explicit validation checkpoint up front, a gotchas table that maps symptoms to fixes for error recovery, and a retrofit reference that includes suite-run, route-table diff, and grep verification with fix-before-proceeding loops. The batch consolidation workflow is fully validated, so the batch-operation cap does not apply.

Progressive Disclosure

The body is a well-organized overview with clearly headed sections, and the single bundle reference (`references/retrofit.md`) is one level deep, signaled in two places, and accurately described ('audit commands, the consolidation order, and how to keep specs and routes green'). The retrofit material is appropriately split out rather than inlined, and navigation is easy.

Specificity

The description lists multiple concrete actions — serving a child resource from a single controller via a route concern plus `resource_for`, replacing hard-coded `Parent.find(params[:parent_id])` lookups, consolidating duplicated per-parent controllers — with concrete artifacts (`Articles::CommentsController`, `commentable_type`, `generated reports/duplications/attachments`). Coverage is comprehensive rather than leaving minor gaps, so it matches the top anchor rather than the 4 anchor.

Completeness

It clearly answers 'what' (serve child resources hanging off many parents from one controller using a route concern and `resource_for`) and 'when' with an explicit five-clause 'Use when...' listing concrete trigger situations. Both halves are explicit with concrete trigger phrases, matching the top anchor.

Trigger Term Quality

Good natural-phrase coverage — 'comments on multiple models', 'commentable', 'reportable', 'namespaced controller', 'consolidating duplicated per-parent controllers' — but the single most natural term a Rails developer would say, 'polymorphic', never appears in the description itself. This is a few natural terms short of the comprehensive anchor, but well above 'some relevant keywords with missing synonyms' (3).

Distinctiveness Conflict Risk

It carves out a clear niche — Rails polymorphic child controllers via a route concern with `*_type` defaults and the `rolemodel_rails` gem — with distinctive triggers (`commentable_type` route default, per-parent namespaced controllers) that are unlikely to fire a wrong skill. It is not merely 'mostly distinct with minor overlap' (4) because no closely related skill would claim these triggers.