Conciseness

The body is mostly efficient — short code blocks, tables, and a tight Notes section — but the Quick Start section substantially duplicates content that reappears in 'Historical OHLCV' (near-identical get_market_data JSON and loader example), and the path-convention blockquote ('Path convention: every link above...') is author-facing meta-commentary rather than user guidance. This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; it is not a 4 because the duplication is more than a minor trim, and not a 2 because there is no padded conceptual explanation.

Actionability

Every section provides fully executable, copy-paste-ready code or JSON: the get_market_data tool call, the DataLoader snippet, yf.Ticker property examples, interval tables with limits, and backtest config.json examples. This matches 'fully executable; copy-paste ready code or commands; specific examples cover the common cases'.

Workflow Clarity

The interface-selection hierarchy is clear and well-sequenced: prefer get_market_data, fall back to the DataLoader for scripts, use raw yfinance only for non-OHLCV data, and per-interface reference docs are dispatched by need ('read the one you need rather than loading them all'). It sits below 5 because there are no explicit validation checkpoints for fetched data (e.g. handling empty frames or rate-limit failures), but above 3 since the read-only flow has no destructive or batch manipulation requiring feedback loops and the routing sequence is explicit.

Progressive Disclosure

The overview keeps only summary-level content in SKILL.md and points to six real, one-level-deep reference docs via a table that signals exactly what each doc covers (e.g. [yahoo_client_get_chart](references/yahoo_client_get_chart.md) for 'Direct v8 OHLCV bars'); all six linked files exist in references/. This matches 'clear overview with well-signaled one-level-deep references; content appropriately split; easy navigation'.

Specificity

The description names the domain ('global market data interface', 'US, HK, and Canadian stocks, ETFs, and indices') and one concrete action ('retrieve OHLCV and research data'), but the action list is minimal and 'research data' is vague — it does not enumerate what research data covers. This matches 'names domain and 1-2 concrete actions, but not comprehensive'; it is not a 4 because it does not list several specific actions, and not a 2 because the scope (markets, instruments, OHLCV) is concretely stated.

Completeness

The 'what' is clear ('retrieve OHLCV and research data ... via Yahoo Finance'), but there is no 'Use when...' clause or equivalent explicit trigger guidance, which caps completeness at 3 per the judging guidelines. It fits 'has a clear what but when is missing or only weakly implied' rather than the 4-anchor, which requires an explicit 'when'.

Trigger Term Quality

Good keyword coverage with natural terms users would say: 'yfinance', 'market data', 'stocks', 'ETFs', 'indices', 'Yahoo Finance', 'OHLCV'. Missing a few common variations such as 'historical prices', 'quotes', or 'financials', which keeps it below the comprehensive-synonyms anchor of 5; it clearly exceeds the 'some relevant keywords but missing variations' level of 3.

Distinctiveness Conflict Risk

Clear niche with distinct triggers: it names yfinance and Yahoo Finance explicitly and scopes to global (US/HK/CA) markets, minimizing risk of firing for unrelated data-source skills. It matches 'clear niche with distinct triggers; minimal conflict risk' rather than the 4-anchor, which implies residual overlap with closely related skills.