Conciseness

The output template is purposeful scaffolding, but there is outright duplication (the 'If a design document is specified' bullets repeat almost verbatim as the 'When given a design document' numbered list), the 'Best Practices' section largely restates the Quality Checklist, and the NFR/security/testing sections list generic boilerplate Claude already knows. Borders on 2 due to the duplication, but the core is a coherent template rather than padded prose, so 3 fits best.

Actionability

Concrete and executable for an instruction-only skill: exact usage commands, a full functional-requirement template (Input/Processing/Output/Edge Cases/Validation), worked examples (Go struct, REST contract, pseudocode), and a detailed example output section. Not 5 because minor gaps remain — e.g. no guidance on where to write the spec despite the Write tool being allowed.

Workflow Clarity

The Task Execution section sequences work on $ARGUMENTS and the Quality Checklist ('Before finalizing, verify...') acts as an explicit validation checkpoint before output. Not 5 because there is no clarify/iterate feedback loop for ambiguous or incomplete designs, and the duplicated execution blocks muddy the sequence.

Progressive Disclosure

No bundle files exist and none are referenced; all ~310 lines (full section templates, the example specification, best practices) are inlined in one file. Internal headers give it real structure, so it is above the unstructured anchor 2, but content that belongs in references/ files is inline and there is no reference navigation, capping it at 3.

Specificity

Names the domain and one concrete action — 'transforming high-level designs into detailed, implementable technical specifications' — but this is essentially restated ('converting requirements or designs into precise specs') rather than expanded; it never enumerates the spec types produced (API contracts, data models, integrations). Not 4 because it does not list several specific actions.

Completeness

Explicitly answers both: what ('transforming high-level designs into detailed, implementable technical specifications') and when ('Use when converting requirements or designs into precise specs that developers can implement directly'). Matches the anchor-5 pattern of a clear what plus a concrete trigger phrase, so 4 is too low.

Trigger Term Quality

'Use when converting requirements or designs into precise specs' uses natural phrasing users would say ('requirements', 'designs', 'specs'). Not 5 because common variations like 'design doc', 'spec out', or 'technical spec' are missing; not 3 because the core trigger phrase is genuinely natural rather than jargon.

Distinctiveness Conflict Risk

The design-to-specification conversion niche is mostly distinct with clear triggers, but it overlaps somewhat with general architecture/planning or task-breakdown skills. Minor overlap only, so 5 is not earned and 3 is too harsh.