Conciseness

The body is dense and imperative with little textbook explanation of known concepts, but routing guidance is repeated across three sections ('Purpose and activation', 'Routing Boundary', 'Example routing'), the Base Framework policy block adds boilerplate, and the ~35-line output-contract template inflates the main file. This matches 'mostly efficient but... could be tightened' rather than the 4 anchor's minor trims.

Actionability

For an instruction-only skill the guidance is highly concrete: per-principle diagnostic questions with false-positive gates, explicit severity/confidence rubrics, a copy-paste output template, mode-specific rules, and named tooling. It falls short of fully executable because the 'Required packaged policies' (shared/base/*.md) are referenced as required but do not exist in the bundle, leaving a gap in the guidance.

Workflow Clarity

The five-step workflow is clearly sequenced (scope/trace, build design map, diagnose with false-positive gate, assess impact, propose safe path) with explicit validation checkpoints — the evidence -> change scenario -> impact -> improvement -> trade-off -> test chain, evidence classification tiers, tests-before-structural-advice rule, and a final quality checklist. This matches the 5 anchor's explicit validation steps and error-recovery guidance.

Progressive Disclosure

The three real reference files (principles-and-evidence.md, refactoring-and-language.md, examples.md) are one level deep, well-signaled, and loaded at point of need. However, ten referenced paths (nine shared/base/*.md policy files and shared/workflow-contract.md) do not exist in the bundle despite being labeled 'Required', and the long output-contract template could live in a reference file — structure is present but organization has real gaps.

Specificity

The description names one concrete action ("Review existing code or modules specifically through practical SOLID design risks") and enumerates five specific focus areas ("responsibility, extensibility, substitutability, interface capability, and dependency inversion"), giving concrete scope with only minor coverage gaps. It is noticeably more specific than the 3 anchor's '1-2 concrete actions', but lacks the multiple distinct action verbs of the 5 anchor.

Completeness

Both parts are present: a clear what ("Review existing code or modules... through practical SOLID design risks") and an explicit when ("Use for SOLID-focused diagnosis. Do not use for broad architecture review or implementation refactoring"). The when-clause names a domain rather than concrete user trigger phrases (e.g. "when the user asks whether these classes violate SOLID"), matching the 4 anchor where 'when' could be more explicit or specific.

Trigger Term Quality

Good natural-term coverage: "SOLID", "responsibility", "extensibility", "substitutability", "interface capability", "dependency inversion", "code", "diagnosis" — terms a user seeking this skill would say. Common synonyms such as "SRP", "LSP", "single responsibility principle", "coupling", and "cohesion" are missing, which keeps it below the comprehensive 5 anchor.

Distinctiveness Conflict Risk

The skill occupies a clear niche (SOLID-focused diagnosis) with explicit exclusions ("Do not use for broad architecture review or implementation refactoring") that separate it from adjacent skills. Trigger risk is minimal because the SOLID framing is highly specific, matching the 5 anchor's 'clear niche with distinct triggers'.