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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.

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Claude Code v2.1.221

Whiteboard prompt: answer by drawing, and tell a viewer Submit apart from a send

Not switched on
Useful1 Signal2
Whiteboard

Whiteboard instructions teach Claude to answer by drawing and ignore plain saves; still disabled.

Whiteboard prompt distinguishes viewer saves from sends and pushes answers onto the board; skill is off.

What

The skill instructions teach Claude to distinguish a viewer save from a send and to put answers on the board rather than in prose. Off in this build.

Details
  • a viewer Submit republishes without flagging Claude, so ping.n decides: a value higher than the one already handled is a send to answer on the board, an unchanged one is a save to absorb without drawing back
  • board text is capped to short labels and one-line questions
  • ids must be cl_ prefixed and at most 40 characters
  • arrows may not bind to another arrow, line or freehand stroke
  • a line or two of reasoning in chat is now allowed
  • gate: whiteboard skill isEnabled g5v = Wms() && Ige(), and Wms returns !1
Evidence

An answer is drawn, not written

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 v2.1.221 →