Conciseness

The "Purpose" bullet list restates the description, the "Tips" section addresses the invoking user rather than instructing Claude, and the three full depth-level markdown examples (~40 lines) are padded with generic placeholder text. It is not a 2 because most sections are directly instructional with no conceptual filler Claude already knows; not a 4 because these sections could each be tightened or cut.

Actionability

Concrete, executable guidance throughout: bash context-gathering commands (head/grep/cat), a structured output template with placeholders, and worked examples per depth level. Not a 5 because "Step 4: Structure the explanation" has no body of its own (it collapses into the "## Output format" section after a stray `---`), and the "Related code" entries are unexplained path placeholders; not a 3 because the commands and templates are executable, not pseudocode.

Workflow Clarity

A clear four-step sequence (determine scope → assess complexity → gather context → structure output) with an explicit complexity→depth mapping. Validation checkpoints are absent, but the task is read-only and non-destructive, so the destructive/batch cap does not apply; a cheap verify-the-target-exists step before explaining would still help. Not a 3 because the sequence is coherent with only minor gaps; not a 5 because there is no explicit verification step at all.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), and the single 174-line body is well-sectioned with clear headers and no nested references. Not a 5 because it exceeds the simple-skill threshold (~50 lines) and the depth-level examples and usage examples are candidates for trimming or splitting; not a 3 because the organization is clear and nothing is buried.

Specificity

"Explain code, concepts, or system behavior with adjustable depth levels" names the domain (code, concepts, system behavior) with one concrete action ("explain") plus the depth-level feature — matching the anchor of 1-2 concrete actions without comprehensive coverage. It is not a 2 because it goes beyond minimally naming a domain, and not a 4 because only a single verb is offered where stronger descriptions list several specific actions.

Completeness

The "what" is clearly stated in the description string, and an explicit "when" exists in the frontmatter ("Use when asking Claude to explain code, a function, an algorithm, or a concept"), so the missing-'Use when' cap does not apply. Not a 5 because the trigger clause lives in a separate when_to_use field rather than being consolidated into the description string itself; not a 3 because equivalent explicit trigger guidance is present.

Trigger Term Quality

Natural terms are present — "explain", "code", "concepts", "system behavior" in the description, extended by "a function, an algorithm, or a concept" in the frontmatter's when_to_use — giving good keyword coverage. Not a 5 because common phrasings users actually say ("how does X work", "walk me through", "what does this do") are absent; not a 3 because the covered terms are natural, not jargon.

Distinctiveness Conflict Risk

The explanation-only niche (no editing, reviewing, or building) is mostly distinct from action-oriented skills, with the when_to_use bounding it to explain requests. Not a 5 because "explain code/concepts" is broad enough to overlap with adjacent analysis skills (e.g., code review or documentation skills); not a 3 because the scope is clearly narrower than generic "works with code".