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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 v2.1.223

Undelivered attachments are reported as a tool error

You'll notice
Useful3 Signal0
Teammate Messaging

Attachments that fail to send are now named as errors instead of falsely reported as delivered.

What

The teammate message tool used to always return "Message delivered to user." with a count of attachments, regardless of what happened to them. Attachments that failed to upload are now named in the result.

Details
  • Failed attachments are listed with their path and the error that occurred.
  • The tool result is flagged is_error: true instead of reporting success.
  • The result text instructs the model to tell the user which attachments were not delivered and why.
Evidence

could NOT be delivered:

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 v2.1.223 →