Agent Sketchbook lets Claude draw stroke-by-stroke, viral spider-web image wows AI circles
RileyRalmuto · x · 2026-09-26
Developer Riley Coyote built Agent Sketchbook, a custom drawing engine for AI agents (not an official Anthropic product) — so distinctive that even Grok spontaneously wrote an accurate explanation of it, which the author shared.
The approach is unusual: instead of image-generation models, the agent describes every individual mark in detail — stroke path, pressure, brush/pencil type, angle, and velocity — and a simulated engine with layers, an eraser, and real-media-like physics renders it. Riley calls it the closest an agent gets to drawing by hand, more like instructing someone stroke-by-stroke than generating a picture at once.
The viral spider-web image was created this way with Claude Opus, containing over 10,000 strokes.
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