01Six pressure-sensitive brushes (Pen, Pencil, Marker, Watercolor, Highlighter, Eraser)
02Multi-layer canvas with up to 20 layers, blend modes, and opacity control
03Session-scoped canvases, persisted locally for each Claude Code session
04Structured annotations (pins, text, callouts) with status lifecycle and stable IDs for Claude interaction
05Multi-session support for connecting and submitting to multiple Claude Code instances
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