Follow Discord
Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.223 ·

Undelivered attachments are reported as a tool error

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

You'll notice Improvements
JSON All of v2.1.223
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
Teammate MessagingArea: what it touches
ImprovementsKind: in v2.1.223,
ImprovementsSection of the release
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.

See this entry in the whole of v2.1.223 →

Feedback