Conciseness

The body (~11,000 words) contains no padding about concepts Claude already knows — every paragraph carries skill-specific methodology — but the rhetorical style ('manufacturing a decision that has all the authority of one and none of the examination', 'the ceremony wearing an apology') roughly doubles the tokens a leaner phrasing would need, and the same rules are covered three times: stated in 'Critical rules', elaborated in the phase sections, then restated in 'Common failures' (e.g. the 'missing number is not evidence' point appears in rules 4, Evidence, and the failures section). This matches anchor 3 ('mostly efficient but... could be tightened') rather than 2, because the substance is not unnecessary explanation of known concepts, only over-written expression.

Actionability

For an instruction-only skill the guidance is exceptionally concrete: exact question sets per problem kind ('who hurts', 'what it costs today', 'what happens if nothing changes'), a copy-paste-ready validator command ('python3 <skill-dir>/scripts/validate_design.py .design/<name>.md' with the Windows fallback spelled out), a fixed decision grid, explicit status vocabularies ('clear', 'blocked by', 'rfc', 'spike', 'design'), and word budgets ('about 2,000 words... about 4,000, plus about 250 for each slice beyond eight'). Three worked examples (open decision, already committed, wrong skill) map user input → actions → result, covering the common cases. Per the scoring note, absence of code is not penalized when guidance is this actionable.

Workflow Clarity

The multi-step process is explicitly sequenced ('SITUATION → PROBLEM → VERDICT → DECIDE') with the ordering rationale given, a hard gate ('Then stop. The user confirms before a single technical option is discussed'), and a dedicated validation section: run the validator, 'Fix every error', hand to a fresh reader, 'Check each finding before accepting it, fix what holds and run the validator again', plus a judgment checklist and a stopping rule. This is the anchor-5 pattern: clear sequence, explicit validation steps, feedback loops for error recovery, and checklists for a complex process.

Progressive Disclosure

The bundle is well used: 'references/document-format.md' (verified to exist, 2,390 words, one level deep — it points back to SKILL.md rather than nesting further) and 'scripts/validate_design.py' are both real, and load timing is explicitly signaled ('Read references/document-format.md when you write the .design/<name>.md artifact — after the verdict is confirmed... Do not load it during the interview'). Scored against anchor 4 rather than 5 because the main body itself is a ~11,000-word monolith — material such as the ~60-line 'Common failures' catalog and the detailed slice-authoring rules could plausibly live in one-level-deep reference files, leaving SKILL.md closer to an overview.

Specificity

The description names the domain ('new or large projects') and one composite concrete action — 'turns a vague idea into a design doc with a clear product problem and the technical solution' — which names the deliverable and its two contents. It matches anchor 3 ('names domain and 1-2 concrete actions, but not comprehensive') rather than 4, because it does not list several distinct actions (the PDF-skill anchors' 'extracts, fills, merges' pattern), and it is well above anchor 2 since the action is specific rather than generic. Third person is used ('Thinks through', 'turns'), so no voice penalty.

Completeness

Both halves are explicit: the 'what' ('turns a vague idea into a design doc with a clear product problem and the technical solution') and a concrete 'when' clause ('Use when exploring a new project, planning or designing a big project or system, or asked for a "design doc"') with literal trigger phrases. It additionally supplies negative guidance ('Do NOT use for clear features or projects'), matching anchor 5 ('clearly and explicitly answers both what AND when with concrete trigger phrases') rather than 4, whose 'when' is merely present but less specific.

Trigger Term Quality

Natural user phrasings are present and varied: 'exploring a new project', 'planning or designing a big project or system', and the quoted 'asked for a "design doc"' — all things a user would plausibly say verbatim. This fits anchor 4 ('good keyword coverage; a few natural terms missing'): common adjacent phrasings like 'greenfield project', 'project brief', or 'architecture/design proposal' are absent, so it falls short of anchor 5's comprehensive synonym coverage, but it clearly exceeds anchor 3's 'missing common variations'.

Distinctiveness Conflict Risk

The skill occupies a clear niche — upstream discovery/design-doc production for new or large projects — and actively disambiguates from its closest siblings: 'Do NOT use for clear features or projects (use tlc-spec-lean or tlc-spec-driven)'. That explicit routing-away is exactly what anchor 5 asks for ('clear niche with distinct triggers; minimal conflict risk'); anchor 4 ('minor overlap risk with closely related skills') is beaten because the closely related skills are named and excluded by name.