nc://sketch-pad

Sketch Pad: draw a shape with the mouse in a browser tab, save it, and the model reads the PNG. A Nodecode rewrite of aydnOktay/hermes-sketch-pad by aydnOktay.

Get it

Tell the agent "add the sketch-pad cell", or run nodecode add nc://sketch-pad.

Set it up

Nothing is required. The cell serves the pad on 127.0.0.1:17319 and keeps drawings in sketches/ under this profile's home. In /settings, the sketch-pad section changes three things:

• port (17319): where the pad answers; 0 lets the system pick, and a port someone else holds falls back to one it picks, with a notice.
• max_bytes (800000): the largest PNG a save takes.
• directory (sketches/): where the drawings go, under the home.

Use it

1. /sketch prints the pad's address. Open it in a browser tab -- the same machine, nothing is exposed off it -- and draw with the mouse or a finger. Clear, pen width and ink colour are there; Save keeps the drawing.
2. Ask the agent about it: "what did I draw", "this shape", "the sketch". It calls sketch_pad_last for the file and (look PATH) to see it, then answers from the pixels.
3. Later in the session, the same path still works, so it can look again.

Each drawing is kept as sketch-<stamp>.png; last.png is always the newest one, replaced atomically, for anything that wants one fixed path.

Two tools, both also callable from eval:

;; the newest drawing: path, bytes, size, when it was saved
(nlk:json-value (sketch_pad_last) :string "path")

• sketch_pad_last -- the newest drawing (no arguments).
• sketch_pad_save -- keep a base64 PNG as a drawing: {png_base64}. A data:image/png;base64, prefix is accepted. Reaches the same folder the page saves into, so a screenshot or another tool's image can be talked about the same way.

A drawing is only what its pixels show: the model is told never to describe one it has not looked at.

The pad is local. The page posts to this cell's own listener on loopback; no third-party service, no key and no network are involved.