Conciseness

Roughly 30 lines with no re-explanation of concepts Claude already knows; every section earns its tokens and assumes Claude's competence, matching the lean-and-efficient anchor.

Actionability

Names a concrete tool ("Use `planoai trace` filters") and specific steps, but provides no complete executable example (e.g. a sample command with flags) and the "Apply These Rules" items (observe-tracing, observe-span-attributes, observe-trace-query) are unexpanded pointers, leaving key details missing.

Workflow Clarity

A clearly numbered Execution Checklist with explicit verification guidance ("Prefer trace evidence over assumptions", "Return exact commands to reproduce and validate findings"); for this simple, non-destructive skill the sequence and checkpoints are sufficient.

Progressive Disclosure

Under 50 lines with clean sections (When To Use, Apply These Rules, Execution Checklist) and no external bundle files, so well-organized sections alone satisfy the simple-skills note for a top score.

Specificity

Lists multiple concrete capabilities — "sampling strategy, span attributes, and trace query-based root-cause analysis" — within a clearly named domain, matching the anchor that lists several specific concrete actions.

Completeness

Explicitly states what it does ("Improve Plano tracing and debugging workflows") and when to use it via an explicit "Use for ..." trigger clause, answering both what and when.

Trigger Term Quality

Includes natural terms a user would say such as "tracing and debugging", "sampling strategy", "span attributes", and "root-cause analysis", giving good coverage rather than just one keyword.

Distinctiveness Conflict Risk

Tied to the specific "Plano" system with niche triggers like "trace query-based root-cause analysis", making it unlikely to fire for unrelated skills.