Source Intelligence

DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

All of v2.1.251 Home All releases olderv2.1.250
Claude Code v2.1.251

Multiplayer whiteboard artifact

Use it now
Useful4 Signal5
Artifacts

A shared sketch canvas lets everyone see strokes and cursors live, with Claude drawing too.

What

A collaborative sketch canvas joins the existing single-player whiteboard: everyone with the board open sees each other's strokes and cursors as they happen, and Claude can draw on it live. It supports boxes, databases, decision diamonds, sticky notes, arrows, freehand, text and pasted images.

Details
  • Availability is decided by three separate internal checks that must all pass; nothing in the build sets them locally, so whether it appears is decided elsewhere.
Evidence

Create a multiplayer whiteboard artifact - a live sketch canvas for wireframe-fidelity diagrams (boxes, databases, decision diamonds, sticky notes, arrows, freehand, text, pasted images) where everyone with it open sees each other's strokes and cursors as they happen

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.251 →