Conciseness

The body is lean and assumes competence (no explanation of what galleries or lazy loading are), but the 7-line docs.sirv.com URL list duplicates the 'Official Docs Map' in references/implementation.md verbatim, and 'Red Flags'/'Verification' overlap workflow steps 6-8 (lazy/LCP, reserving space, data-alt, CSP) — minor trims available.

Actionability

Three complete, copy-paste-ready HTML blocks cover the common markup shapes (mixed child-item gallery with preconnect/script, smart .view gallery, single-div comma-separated gallery), and concrete attribute-level guidance follows ('autostart:created', 'thumbnails.position:bottom', 'itemsOrder:spin, zoom, video, model, image').

Workflow Clarity

The 8-step Default Workflow is clearly sequenced from media identification through real-browser verification, and the Verification section is an explicit checklist, but there are no error-recovery feedback loops (e.g., what to do when a data-src 404s or CSP blocks a resource), matching anchor 4's 'minor validation gaps'.

Progressive Disclosure

Clear overview structure with a well-signaled, one-level-deep reference: 'Read [implementation.md](references/implementation.md) when writing or reviewing viewer markup, script loading, options, breakpoints, smart galleries, API/events, or CSP' — the file exists and the body appropriately keeps only overview patterns inline.

Specificity

Concrete actions appear ("building, auditing, or debugging") with a comprehensive enumeration of subject areas ("product galleries, zoom viewers, 360 spins, videos, YouTube/Vimeo embeds, 3D models, PDF galleries, smart .view galleries, thumbnails, fullscreen/mobile behavior"), but the leading capability statement "Sirv Media Viewer guidance" is generic compared to anchor 5's fully concrete action list, leaving a minor gap.

Completeness

Both what ("Sirv Media Viewer guidance" for the enumerated media/viewer surface) and when ("Use when building, auditing, or debugging Sirv product galleries...") are explicitly answered with concrete trigger phrases, matching the anchor 5 pattern; the 'when' clause is unusually specific.

Trigger Term Quality

Comprehensive natural-term coverage including synonyms and file extensions: "product galleries", "zoom viewers", "360 spins", "YouTube/Vimeo embeds", "3D models", "PDF galleries", "smart .view galleries", "data-src/data-options/data-breakpoints", "viewer API/events", "CSP", "Core Web Vitals" — terms users would naturally say when needing this skill.

Distinctiveness Conflict Risk

Clear niche with distinct triggers: every trigger is Sirv/SMV-branded ("Sirv product galleries", "SMV class=\"Sirv\" markup", "Sirv JS loading", "viewer API/events"), so it would not fire for generic image, video, or gallery work.