Conciseness

The body is lean and well-sectioned with no explanations of concepts Claude already knows; every section carries actionable rules. Minor trimmable content exists (the zarazangrui credit line, four overlapping STYLE_PRESETS.md pointers, and the duplicated opener-command guidance in Deliver), placing it at anchor 4 rather than anchor 5's every-token-earns-its-place.

Actionability

Concrete, executable guidance throughout: exact CSS ("height: 100vh; height: 100dvh; overflow: hidden"), clamp() scaling, five named validation resolutions, a density-limits table, OS-specific opener commands, and a python-pptx fallback policy. It is not anchor 5 because the mandatory viewport-safe CSS base is deferred to a STYLE_PRESETS.md file that does not exist in the bundle; it is above anchor 3 because the critical rules are stated inline and specific.

Workflow Clarity

A seven-step workflow with mode detection, a hard viewport-fit gate with error-recovery rules ("when content does not fit, split into multiple slides"), an explicit validation step at named resolutions, and a deliverable checklist. This matches anchor 5: clear sequence, explicit validation, and feedback loops for correction.

Progressive Disclosure

The body references STYLE_PRESETS.md four times as the required source for the CSS base, density limits, and preset catalog, but that file does not exist anywhere in the bundle (there is no references/ directory), so the instruction "Before generating, read STYLE_PRESETS.md" fails immediately. Meanwhile the provided scripts (scripts/extract-pptx.py, scripts/export-pdf.sh) are never referenced from SKILL.md, making provided content undiscoverable. Broken reference paths and orphaned bundle files make navigation unusable, matching anchor 2 rather than anchor 3's merely-unclear signaling; not anchor 1 because the body itself is well-sectioned rather than a monolithic wall.

Specificity

"Create stunning, animation-rich HTML presentations from scratch or by converting PowerPoint files" plus "discover their aesthetic through visual exploration" names several concrete actions with only minor gaps (the enhancement-of-existing-decks mode from the body is omitted). It lists more than the 1-2 actions of anchor 3 but is not fully comprehensive, so anchor 4 is the best fit.

Completeness

It explicitly answers both what ("Create... HTML presentations from scratch or by converting PowerPoint files") and when ("Use when the user wants to build a presentation, convert a PPT/PPTX to web, or create slides for a talk/pitch") with concrete trigger phrases, matching the anchor 5 example structure. The when-clause is fully explicit, so anchor 4's 'could be more explicit' does not apply.

Trigger Term Quality

Natural user phrases like "build a presentation", "convert a PPT/PPTX to web", "create slides for a talk/pitch", and "PowerPoint files" give good coverage including file extensions. A few natural synonyms are missing ("deck", "slideshow", "pptx to HTML"), so it matches anchor 4 rather than anchor 5's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The HTML/web slide-deck niche is clear and mostly distinct, but "converting PowerPoint files" carries minor overlap risk with a general .pptx-editing skill, matching anchor 4. Not 5 because of that overlap; not 3 because the browser-delivered presentation framing is distinctive.