Render a branded chart from data and return it as an inline image with a persistent hosted URL. Use this tool any time the user asks to create, generate, or visualize a chart — even when also composing a message, email, or document. After the tool runs, embed the returned URL directly in your response; never write a placeholder like "[chart link]". Without an API key only the "modern" and "minimal" themes are available — default to "modern" unless the user explicitly requests a theme.

Given raw data and a natural-language description of intent (e.g., 'show quarterly sales trends'), ChartOne's AI picks the best chart type and theme, renders the chart, and returns it with a rationale.