Conciseness

The body is mostly lean bullet-point guidance with no concept explanations, but the entire 'Key Principles' section restates rules already given in 'The Process' ('One question at a time', 'Multiple choice preferred', 'Explore alternatives... 2-3 approaches', 'Incremental validation'), which is more than minor trimming. This fits 'mostly efficient but could be tightened' rather than the minor-instances anchor at 4.

Actionability

Guidance is concrete and executable for an instruction-only skill: 'sections of 200-300 words', the path template 'docs/plans/YYYY-MM-DD-<topic>-design.md', the exact question 'Ready to set up for implementation?', and 'Propose 2-3 different approaches with trade-offs'. It stops short of fully copy-paste-ready because there is no example follow-up question or design-document skeleton to cover common cases.

Workflow Clarity

The process is clearly sequenced (understand the idea → explore approaches → present the design → document → implement) with explicit checkpoints ('Ask after each section whether it looks right so far', 'Be ready to go back and clarify'). Minor gaps remain: the 'Documenting & Specifying' section's placement in the flow is ambiguous, and the criterion for when to stop asking questions is only implicit in 'Once you understand what you're building'.

Progressive Disclosure

This is a small (~55-line) self-contained process skill with clean section headers and no content bulky enough to offload to separate files; no bundle files exist, so nothing is misplaced. External skill references ('mcp-feedback-enhanced', 'superpowers:writing-plans', 'elements-of-style') are clearly signaled and conditional, warranting the top anchor under the simple-skill guideline.

Specificity

The capability statement is a single abstract action ('Explores user intent, requirements and design before implementation') while the enumerated list ('creating features, building components, adding functionality, or modifying behavior') describes trigger contexts, not what the skill does — matching the anchor for minimal/generic actions. The rubric's second-person penalty ('You MUST use this') reduces the base of 3 by 1.

Completeness

It explicitly answers both: what ('Explores user intent, requirements and design before implementation') and when ('You MUST use this before any creative work - creating features, building components, adding functionality, or modifying behavior') with concrete trigger phrases. The when-clause is already explicit and specific, so it fits the top anchor rather than the 'could be more explicit' anchor at 4.

Trigger Term Quality

Natural user phrases like 'creating features', 'building components', 'adding functionality', and 'modifying behavior' give good coverage, but common synonyms such as 'brainstorm', 'implement', or 'plan a feature' are missing, so it falls short of the comprehensive anchor.

Distinctiveness Conflict Risk

The trigger scope ('before any creative work... or modifying behavior') sweeps in nearly every development task and the 'MUST' framing claims precedence over other skills, creating high overlap risk with many implementation-related skills. It is not a 1 because the design/brainstorming niche itself is distinct from execution skills.