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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 v2.1.248

Whiteboard image elements must have a source

You'll notice
Useful2 Signal2
Elsewhere

Whiteboard images must have a valid src, and non-images can't carry one.

src
What

Whiteboard element validation now rejects an image element with no valid src, and rejects a src on any element that is not an image.

Evidence

if (r.type === "image")

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

See this entry in the whole of v2.1.248 →