analyze_chart_screenshot
Passes a base64-encoded chart screenshot to Claude using the vision modality, requesting identification of key support and resistance levels from the chart image. The image content block is structured per the Anthropic API spec (`type: image`, `source.type: base64`) so no external image hosting is required.
Vision-based chart analysis captures information that numerical data cannot — drawn trend lines, volume bars, candlestick patterns, and chart annotations are all visible in screenshots but absent from raw OHLCV arrays. Use this function as a complement to numerical analysis: compute S/R levels programmatically, then pass the chart screenshot to Claude to verify and identify any levels the algorithm missed.
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