Conciseness

The API specifics (endpoints, params, rate limits) are high-value, but there is repeated material: BASE_URL is stated three times (Quick Start code, 'Important: New Endpoint Format', Best Practices #1), the 'Free vs Paid Features' section restates the ⚠️ Paid flags from the endpoint tables and the Rate Limits section, and the 'Unique FMP Features' bullets add little ('Standardized Financials - Normalized line items'). This fits 'mostly efficient but includes some unnecessary explanation or could be tightened'; the time-sensitive /api/v3/ → /stable/ migration is properly isolated in a new-vs-old-format section, avoiding that penalty, but keeps it below 4.

Actionability

Every task ships complete, copy-paste-ready Python with real endpoints, parameters, and runnable examples with expected output ('quote = get_quote("AAPL")', 'filings = get_sec_filings("AAPL", "10-K")'), plus a reusable safe_api_call error handler. Authentication, base URL, and per-task code cover the common cases exactly as the 5 anchor requires; nothing is pseudocode or hand-wavy.

Workflow Clarity

Each task is a clear, unambiguous single-call pattern with usage examples, and the Error Handling section provides an explicit error/empty-response feedback loop, which suits this read-only API skill (no destructive or batch operations, so no validation cap applies). It sits at 4 rather than 5 because there is no guidance on sequencing across tasks or checking remaining daily quota before batch fetching — 'most checkpoints present; minor validation gaps'.

Progressive Disclosure

Section structure is good (Quick Start, tasks, error handling), but the ~65-line inline 'API Endpoints Reference' tables duplicate content that already lives in the bundled references/ENDPOINTS.md, and neither bundle file — references/ENDPOINTS.md nor scripts/fmp_client.py — is ever mentioned or linked from the body, so the references are effectively invisible to a reader. That matches the 3 anchor ('content that should be separate is inline; references present but not clearly signaled'); it stays above 2 because sections are well-organized and the skill is navigable on its own.

Specificity

The description names concrete capabilities — 'fetching financial statements, ratios, DCF valuations, insider/institutional ownership, or screening stocks' plus 'SEC filings, institutional holdings (13F), and congressional trading' — which matches the 'several specific actions' anchor. It falls short of 5 because notable capabilities like real-time quotes/prices and earnings calendars are absent, and 'Financial Modeling Prep API for stocks, fundamentals...' leans on domain nouns rather than verbs for the first half.

Completeness

Both parts are explicit: 'what' is 'Financial Modeling Prep API for stocks, fundamentals, SEC filings, institutional holdings (13F), and congressional trading' and 'when' is the concrete 'Use when fetching financial statements, ratios, DCF valuations, insider/institutional ownership, or screening stocks'. This mirrors the 5-anchor example structure ('X for A, B, C. Use when ...') exactly; 4 would require the when-clause to be weaker or implicit, which it is not.

Trigger Term Quality

Natural user phrases like 'financial statements', 'DCF valuations', 'SEC filings', 'screening stocks', '13F', and 'congressional trading' are present, with some synonym coverage (13F ↔ institutional holdings, insider/institutional ownership). A few common terms are missing — 'stock quotes', 'prices', 'financial data', 'earnings' — so it fits the 'good keyword coverage, a few natural terms missing' anchor rather than the comprehensive 5.

Distinctiveness Conflict Risk

Naming the specific provider ('Financial Modeling Prep API') and distinctive data like 13F filings and congressional trading gives it a clear niche, but generic triggers like 'fetching financial statements' or 'screening stocks' overlap with the closely related finance-API skills this bundle itself lists (finnhub-api, twelvedata-api, alphavantage-api). That is 'mostly distinct; minor overlap risk with closely related skills' (4), not the minimal-conflict 5.