Source Intelligence

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.

All of v2.1.224 Home All releases olderv2.1.223 v2.1.225newer

Mailbox write failures are reported instead of being assumed to succeed

You'll notice
Useful3 Signal3
Team Messaging

Plan submissions and shutdown requests to another agent now fail visibly when delivery fails.

What

Writes to another agent's inbox can now fail visibly. Submitting a plan for lead approval throws a dedicated error when the write does not land, shutdown requests and shutdown rejections return a failure result naming the target, and the shutdown-approval confirmation is marked degraded. Previously all of these carried on as if the message had been delivered.

Evidence

Failed to write the plan approval request to the lead's inbox \u2014 plan not submitted; try again

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 v2.1.224 →