Names the domain (charts/visualization) and mentions specific chart types (line, bar, pie, timeseries), but describes 'rules for' rather than concrete actions like 'create', 'generate', or 'customize'.

Clearly answers both what ('Rules for charts and visualization') and when ('Use when the user asks for charts, graphs, plots, or visual representations') with explicit trigger guidance.

Includes strong natural keywords users would say: 'charts', 'graphs', 'plots', 'visual representations', plus specific types (line, bar, pie, timeseries). Good coverage of common variations.

Clear niche focused specifically on charts and visualization with distinct trigger terms. Unlikely to conflict with document, data processing, or other skills due to specific visual output focus.

The content is mostly efficient but has some redundancy, particularly in repeating validation rules and chart type explanations. The CRITICAL RULES section partially duplicates information from earlier sections.

Provides concrete, executable guidance with specific JSON examples for chart specs, clear tool calls (validate_sql, skill tool), and explicit code blocks showing exact output format. The workflow steps are specific and actionable.

Excellent multi-step workflow with mandatory ordering (a→b→c→d), explicit validation checkpoints, retry logic (up to 3 times), and clear decision trees for when to load skills or skip steps. Includes explicit prohibited actions.

References external skills (sql-expert, clickhouse-system-queries) and resources appropriately, but the content itself is somewhat monolithic. The chart type rules and output format could potentially be split into separate reference files for cleaner organization.