Under the hoodTier: how much it should matter to you
1Useful: my rating, 1 to 5
0Signal: worth watching, 1 to 5
SDKArea: what it touches
Internal ChangesKind: in v2.1.281,
Internal ChangesSection of the release
What
When Claude Code is driven by another program, the two exchange messages. When a pending request is cancelled, the control_cancel_request message is now added to the queue of outgoing messages. It is sent straight away, with any error logged, only if the outgoing channel has already closed.
Why
Cancel messages now go out through the same queue as other outgoing messages instead of skipping it.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtThe finding does not say whether this changes the order in which the other program receives messages.
Anthropic's release notes agreeImproved screen-reader output in /mcp: a disabled server is read as "off" instead of "pending"
