Conciseness

The body is mostly efficient and assumes Claude's competence (no filler explaining what planning is), but the Planning Doctrine bullets ('Choose the smallest coherent solution', 'Expand scope only when it simplifies the system') substantially repeat ideas restated in Step 3's questions ('What is the smallest solution that keeps the system coherent?') and Step 4's review items. It is not 4 because the doctrine-to-steps redundancy is a noticeable tightening opportunity, and not 2 because there is no padding or explanation of concepts Claude already knows.

Actionability

Concrete, executable guidance throughout for an instruction-only skill: a specific output file ('Write your plan to a PLAN.md file in the project root'), an explicit plan structure template, the 8-question design checklist, and direction to 'Launch parallel explorations... Give each exploration a specific, distinct search focus'. It is not 5 because a small worked example of a plan entry (e.g., a filled-in 'Changes' bullet) would make the template copy-paste ready, and not 3 because the guidance is specific and complete enough to execute without inference.

Workflow Clarity

A clearly sequenced six-step workflow (Explore -> Clarify -> Design -> Review -> Present -> Implement) with explicit validation checkpoints ('Read the critical files your design depends on to verify your assumptions', 'run the verification steps from the plan to confirm all items were completed correctly'), a pre-finalization checklist (the 8 design questions), and feedback loops ('If the user has feedback, revise accordingly'; 'Ask remaining clarifying questions if anything is still ambiguous').

Progressive Disclosure

No bundle files exist, and the body is well organized into clearly headed sections (doctrine, plan file, six steps), so navigation is easy. It is not 5 because at ~110 lines the Planning Doctrine and the plan-structure template are candidates for a one-level-deep reference file, which would keep SKILL.md a leaner overview; it is not 3 because nothing is buried and all structure present is appropriate.

Specificity

The description names the domain ("Holistic, system-aware planning before implementing non-trivial tasks") with a single generic action; it does not list the concrete actions the skill performs (explore, clarify, design, write a plan). It is not 4 because 'holistic' and 'system-aware' are descriptive adjectives rather than additional specific actions, and not 2 because the action and domain are stated clearly rather than minimal or generic.

Completeness

It explicitly answers both what ('Holistic, system-aware planning before implementing non-trivial tasks') and when ('Use when the task involves... Triggers on...') with concrete trigger phrases, matching the anchor for a complete description.

Trigger Term Quality

Trigger phrases '"/plan"', '"plan this"', '"design an approach"', '"let's plan first"' are natural terms a user would say, backed by situational triggers ('new features, architectural decisions, multi-file changes, unclear requirements, or multiple valid approaches'). It is not 5 because common variations and synonyms (e.g., 'make a plan', 'how should we approach this', 'architecture review') are missing.

Distinctiveness Conflict Risk

The '/plan' and 'plan this' triggers carve a fairly distinct niche, but the situational scope ('new features, architectural decisions, multi-file changes') is broad and overlaps with general planning or architect-type skills. It is not 5 because of that overlap risk, and not 3 because the explicit trigger phrases make confusion unlikely.