Conciseness

Roughly 30 lines with zero padding; every sentence carries non-obvious, trace-specific guidance ("A base class, mixin, or intermediate renderer is a hop, not an entry point", "Registration hides callers", "Tests are not callers"). No concepts Claude already knows are explained — an exact match for anchor 5.

Actionability

Fully concrete instruction-only guidance: exact report format and ordering, precise arrow semantics ("'↓' is a synchronous call, '↓ (async)' a job or deferred handoff, '→' a lateral trigger"), "one path:line per hop", "open it before describing what it does". Absence of code is not penalized since the guidance is directly executable, matching anchor 5.

Workflow Clarity

A clear sequence (read AGENTS.md/CLAUDE.md first, trace up/down/sideways, watch gotchas, produce a five-part ordered report) with verification discipline ("Gaps: what was inferred or unsearched, and where you looked", and asking when several unrelated flows exist). It falls short of anchor 5 because verification is embedded in the output format rather than explicit process checkpoints or feedback loops during the trace — anchor 4 fits best.

Progressive Disclosure

Under 50 lines, self-contained with no external references needed, and organized into clean sections (directions, Gotchas, Report). Per the rubric's simple-skill guideline, well-organized sections alone warrant anchor 5 here.

Specificity

Names several concrete capabilities — "traces a piece of code to every place its flow starts", "down to the data it touches", "including calls made from inside installed packages" — but omits the third (sideways: callbacks, events, async handoffs) direction that the body covers, leaving a minor coverage gap. It exceeds anchor 3 (only 1-2 concrete actions) and falls just short of anchor 5's comprehensiveness.

Completeness

Explicitly answers both what ("Traces a piece of code to every place its flow starts and down to the data it touches, including calls made from inside installed packages") and when ("Use when the user says 'trace X' … 'where does this data come from'") with concrete trigger phrases — an exact match for anchor 5.

Trigger Term Quality

Six natural phrases users would actually say, including synonyms ("trace X"/"trace this", "what calls this"/"where is this used"). Common variants like "find all callers of this" or "call graph" are missing, so it fits anchor 4 rather than 5's comprehensive coverage, but is well above anchor 3's partial keyword set.

Distinctiveness Conflict Risk

A clear code-tracing niche with distinctive phrases like "trace X" and "how does this request flow", minimizing conflict risk. Minor overlap remains because "where is this used" could plausibly match a generic code-search skill, placing it at anchor 4 rather than 5.