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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 v2.1.232

SendMessage no longer leaks its display text into the model's view

You'll notice
Useful3 Signal3
Tools

SendMessage display text stays in the UI and no longer leaks into what the model reads.

What

The SendMessage tool result strips its display field before serialising, so that content is shown in the UI only and no longer appears in the JSON the model reads back.

Evidence

mapToolResultToToolResultBlockParam

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 v2.1.232 →