Conciseness

The bulk is dense, domain-specific operational data (benchmark thresholds, confidence weights, exact commands) Claude does not already know, but the data-sufficiency rule is repeated three times (the 4-factor gate, the "MUST NOT: score what you did not measure" section, and the Pre-Delivery checklist), and the checklist imports off-topic on-page audit items ("parse_html return `@type`", "`@graph` wrapper", "H1 findings", "wp-content, shopify CDN"). This matches anchor 3 (mostly efficient but could be tightened) rather than 4, since the repetition and mis-scoped content exceed minor over-explanation.

Actionability

Fully executable, copy-paste-ready commands throughout ("run backlinks_auth.py --check --json", "run moz_api.py metrics <url> --json", "run verify_backlinks.py --target <url> --links <file> --json"), plus exact scoring tables, anchor benchmarks, a fallback cascade with confidence values, and a concrete output format. Matches anchor 5's fully executable coverage of common cases.

Workflow Clarity

Clear multi-step sequence (source detection, 7-section framework with per-section source preference order, health-score computation, output format) with explicit validation checkpoints: a data-sufficiency gate, a mandatory validator with a fix-and-rerun feedback loop ("If the validator returns `status: FAIL`... re-run until it passes"), and a pre-delivery checklist. Matches anchor 5 (explicit validation steps, feedback loops, checklists).

Progressive Disclosure

Good structure with well-signaled, one-level-deep on-demand references ("Load on demand (do NOT load at startup)" for backlink-quality.md and free-backlink-sources.md; no local bundle directories exist). Minor gaps keep it below anchor 5: the body is long with substantial inline detail, and the same reference file is cited with two inconsistent path styles ("../seo/references/backlink-quality.md" in the Toxic Links section versus "${CLAUDE_PLUGIN_ROOT}/skills/seo/references/backlink-quality.md" in Reference Documentation).

Specificity

Enumerates concrete analysis objects ("backlink profile, anchors, toxic signals, competitors, gaps, and disavow candidates") but relies on a single verb "Analyze" and omits scoring/health-report outputs. Matches anchor 4 (several specific items, minor gaps) rather than 5's multi-action comprehensive coverage or 3's 1-2 concrete actions.

Completeness

Both parts are explicit: what ("Analyze a site's backlink profile, anchors, toxic signals...") and when ("Use only when links or referring domains are the requested focus"). The when-clause is a boundary condition rather than concrete user-mention trigger phrases, so it fits anchor 4, not the explicit trigger-phrase enumeration of anchor 5, and is clearly above anchor 3's merely implied when.

Trigger Term Quality

"backlink profile", "anchors", "toxic", "disavow", and "referring domains" are natural phrases SEO users say, but common synonyms like "inbound links", "link building", or "domain authority" are missing. Good coverage (anchor 4), short of the comprehensive synonym/extension sweep of anchor 5.

Distinctiveness Conflict Risk

"backlink profile", "disavow candidates", and "referring domains" carve a distinct off-page SEO niche, and the restriction "Use only when links or referring domains are the requested focus" is an explicit anti-conflict guard against sibling SEO skills. Clear niche with minimal conflict risk (anchor 5).