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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 v2.1.72

SendUserMessage Tool

What

A new tool that lets Claude post structured checkpoint messages to the user, designed for async workflows where the user may only be reading a compact view of the conversation.

Usage: Claude calls SendUserMessage with a message, optional file attachments, and a status (proactive for push notifications, normal for replies).

Details
  • Messages are concise, outcome-focused checkpoints — like commit messages, not recaps
  • Supports markdown formatting and file attachments (screenshots, diffs, logs)
  • proactive status is for reaching the user's phone when they're away (task done, blockers, questions)
  • normal status is for replies to active conversations
  • Tied to a new defaultView setting: "chat" shows only SendUserMessage checkpoints, "transcript" shows the full output
Evidence

New tool constant and prompt definition (search for "SendUserMessage")

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

See this entry in the whole of v2.1.72 →