Created artifacts/logo.png: a 1254 × 1254 opaque PNG.

Drawn with built-in image generation. One draft drawn and kept; none rejected. Checked at 32 pixels in a circular crop: clear pebble mark, readable eyes, no clipping, text, or frame.

Use case: logo-brand. Draw one square 1024×1024 raster token logo for Pebble Agent. One bold, friendly, smoothly irregular river pebble with two substantial dark oval eye cutouts, forming a single memorable pebble-agent mark. Large simple silhouette, almost flat color with at most one broad contrasting stone plane. Distinctive saturated opaque background fills the entire square edge to edge. Strong contrast. Center the complete mark inside the central circular crop, occupying about 75% of the square width. Designed to read crisply as a 32-pixel wallet icon. No text, letters, numbers, ticker, frame, border, inset panel, thin strokes, tiny details, texture, gradients, scenery, extra objects, or cast shadow.