Conciseness

The bulk is lean, operational code with minimal prose, but there are minor instances that could be trimmed: the host-specific '!'-wrapped exec probe paragraph ('If your host has not already executed the shell probes below (for example, in Codex)...'), the 'not affiliated with Yahoo' disclaimer, and caveats Claude already knows ('Correlation is not causation'). Fits 'minor instances of over-explanation' (4) rather than 3's 'some unnecessary explanation', since nearly all prose is operational guidance, not concept teaching.

Actionability

Fully executable, copy-paste-ready Python functions for all four sub-skills, a concrete install snippet, a defaults table, and an intent-routing table; the peer-universe construction delegates to references/sector_universes.md, which contains complete working code. The only gap (scipy used in Sub-Skill C but not probed in Step 1) is explicitly mitigated by a documented fallback ('if scipy is not available, fall back to sorting by average correlation').

Workflow Clarity

Clear sequence — dependency check with install feedback loop, ambiguity-resolution defaults ('If ambiguous, default to Sub-Skill A... Sub-Skill B'), routing table, and a final Step 3 that requires reporting observations and 'tickers dropped due to insufficient data' as light output verification. Not 5 because there is no explicit validation checkpoint on computed outputs (e.g., verifying observation counts or that the target ticker survived the dropna filter) before presenting results; the operations are non-destructive so the cap-3 rule does not apply.

Progressive Disclosure

One clearly signaled, one-level-deep reference (references/sector_universes.md exists, is summarized in a dedicated 'Reference Files' section with when-to-read guidance, and contains no further nested references), good section headers, and a routing table for navigation. Not 5 because ~200 lines of sub-skill code are inlined in SKILL.md while only the peer-universe detail is externalized — a minor organization gap where one or two sub-skill implementations could live in references.

Specificity

Lists multiple concrete actions — 'find correlated peers for a ticker, measure correlation, beta, and spread between specific tickers, cluster a group into a correlation matrix, and track rolling or regime-dependent correlation' — comprehensively covering every sub-skill. Not 4 because there are no coverage gaps: all four documented capabilities are explicitly named in third-person voice.

Completeness

Explicitly answers both 'what' (analyze co-movement: find peers, measure correlation/beta/spread, cluster, track rolling correlation) and 'when' ('Use this skill whenever the user asks...' with concrete trigger phrases), and even adds a single-ticker default ('With a single ticker, assume the user wants its correlated peers'). Clearly matches the 5 anchor, not 4 where the 'when' could be more explicit.

Trigger Term Quality

Comprehensive natural trigger terms including synonyms users would actually say: 'what moves with a stock, what else drops when it drops, related tickers or sympathy plays, sector or supply-chain peers, pair trading or hedging pairs, beta or relative performance, correlation matrices, co-movement, or rolling/realized correlation', plus concrete well-known pairs (AMD/NVDA, LITE/COHR). Not 4 because no common variation is missing.

Distinctiveness Conflict Risk

Clear niche — stock correlation/co-movement analysis via yfinance — with distinct trigger phrases unlikely to fire for unrelated skills. Minimal overlap risk; matches the 'clear niche with distinct triggers' anchor rather than 4's 'minor overlap risk with closely related skills'.