Conciseness

The body is dense and operational — mode table, field-level ledger spec, exact confidence labels — with zero padding or explanations of concepts Claude already knows. Minor redundancy keeps it below the 5 anchor: the 'Use This Skill When' bullets restate the frontmatter description, Cross-References repeats the earlier 'Do not use this skill for discovering sources' line, and several Anti-Patterns (e.g. 'Do not quote data without its unit, time range, population...') restate the step-5 checks. It is clearly above the 3 anchor, which requires unnecessary explanation.

Actionability

For an instruction-only skill the guidance is fully executable: a mode-selection table with deliverables, atomic-unit definitions for the argument tree, an exact evidence-ledger field table, four fixed confidence labels, a Good/Bad central-claim example, and a numbered 9-item default output template. Per the rubric's scoring note, absence of code is not penalized when the guidance is this concrete, so it meets the 5 anchor ('specific examples cover the common cases') rather than the 4 anchor with minor gaps.

Workflow Clarity

A clear 7-step sequence with explicit validation checkpoints — step 1 verifies extraction usability and instructs stopping claims that depend on missing material, step 5 runs a concrete reasoning checklist — and a genuine feedback loop in step 7 (closed-book explanation, compare to ledger, locate the first missing link, repair only that gap, transfer question). This matches the 5 anchor's 'explicit validation steps; feedback loops', not the 4 anchor where checkpoints are only mostly present; no destructive or batch operations apply.

Progressive Disclosure

SKILL.md is a clear overview that defers detailed procedures to two real, well-signaled, one-level-deep references: `references/knowledge-map.md` (pointed to in the mode table) and `references/feynman.md` (pointed to in the mode table and step 7); both files exist and contain no nested references. Detailed mode procedures are appropriately split out of the main body, matching the 5 anchor's clean structure and navigation.

Specificity

The description lists multiple concrete, distinct capabilities — "extract claims and evidence", "build a knowledge map", "learn through Feynman explanation and recall" — plus a full mode enumeration ("quick, deep, map, Feynman, and whole-book reading modes"). This matches the anchor 'Lists multiple specific concrete actions; comprehensive coverage'; nothing is generic like 'helps with documents', so it is not the 4 anchor, which requires minor coverage gaps.

Completeness

It explicitly answers both questions with concrete trigger phrases: "Use when the user asks to deeply read a book, article, PDF, or document set; extract claims and evidence; build a knowledge map; or learn through Feynman explanation and recall". Both what and when are explicit and specific, matching the 5 anchor rather than the 4 anchor where the 'when' could be more explicit.

Trigger Term Quality

Natural terms are well covered: "deeply read a book, article, PDF, or document set", "knowledge map", "Feynman explanation", "claims and evidence", "recall". A few natural phrases a user would plausibly say — e.g. "close reading" or "mind map" (both appear only in the body, not the description) — are missing, which fits the 4 anchor ('Good keyword coverage; a few natural terms missing') rather than the 5 anchor's comprehensive synonym coverage.

Distinctiveness Conflict Risk

The deep-reading/argument-reconstruction/learning niche is clear with distinct triggers ("Feynman explanation", "knowledge map"), but generic file triggers like "PDF" or "document set" carry minor overlap risk with summarization or extraction skills when a user asks to 'read a PDF'. This fits 'Mostly distinct; minor overlap risk with closely related skills' better than the 5 anchor's minimal-conflict niche, and far better than the 3 anchor's broad overlap.