Conciseness

The body is lean and task-focused (numbered analysis steps, an output template, a summary table) with no explanation of concepts Claude already knows, but contains minor trimmable padding: the 'You are a strategic market analyst specializing in market sizing...' persona line, the Purpose section that restates the frontmatter description, and the '(Think Step by Step)' parenthetical. Not 5 because of these minor over-explanations; not 3 because there is no substantive concept over-explanation or padded prose.

Actionability

For an instruction-only analysis skill the guidance is concrete and executable: 7 numbered analysis steps ('Top-Down Estimation: Start from total industry size and narrow to the relevant slice', 'Bottom-Up Estimation: Build from unit economics (customers × price × frequency) to cross-validate'), an exact output structure including a Market Summary Table, per-assumption confidence levels, and explicit tool direction ('Use web search to find current market data'). Not 5 because it lacks a worked mini-example or named data sources (e.g., Statista, IBISWorld, annual reports) that would make estimates concrete; not 3 because nothing is vague or pseudocode-like — every step specifies what to produce.

Workflow Clarity

The 7-step sequence is clearly ordered and embeds explicit checkpoints: bottom-up 'to cross-validate' the top-down estimate, 'Reconciliation of the two approaches' in the output, and assumption mapping with confidence levels and 'How to validate the most uncertain assumptions'. Not 5 because there is no explicit recovery guidance for when the two approaches materially diverge (the key failure mode of this workflow). No destructive/batch cap applies — this is a read/analyze task.

Progressive Disclosure

No bundle files exist (references/, scripts/, assets/ are absent), and the ~85-line body is appropriately self-contained: well-labeled sections (Purpose, Instructions, Output Structure, Best Practices) with a clearly signaled, one-level-deep 'Further Reading' list of external links. Not 5 because the Further Reading links are loosely related to the skill's core job (user interviews, Crossing the Chasm) rather than targeted market-sizing references, leaving minor organization gaps.

Specificity

'Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches' names multiple specific concrete actions — TAM/SAM/SOM estimation via two distinct triangulating methods — with comprehensive coverage of the skill's capability. Not 4 because there are no minor gaps: the what-clause covers every core action the skill performs.

Completeness

It explicitly answers both questions: what ('Estimate market size using TAM, SAM, and SOM with top-down and bottom-up approaches') and when ('Use when sizing a market opportunity, estimating addressable market, preparing for investor pitches, or evaluating market entry') with four concrete trigger phrases — a direct match to the anchor-5 good example pattern. Not 4 because the when-clause is fully explicit with concrete triggers, not merely present.

Trigger Term Quality

Natural trigger coverage is comprehensive and includes synonyms on both the technical and colloquial sides: 'market size', 'TAM, SAM, and SOM', 'sizing a market opportunity', 'estimating addressable market', 'investor pitches', 'market entry' — the phrases a user would naturally say when they need this skill. Not 4 because no commonly used natural phrasing for this task is missing.

Distinctiveness Conflict Risk

Market sizing via TAM/SAM/SOM is a clear niche with unmistakable core triggers ('market size', 'addressable market'), but 'preparing for investor pitches' and 'evaluating market entry' carry minor overlap risk with pitch-deck or market-research skills. Not 5 because of that overlap; not 3 because the dominant triggers would not plausibly fire a different skill.