SDK interrupt can now cancel everything queued in one round-trip / Claude Code v2.1.219

Use it now

Useful4 Signal0

SDK Protocol Notable

Send interrupt with cancel_queued true to stop the current turn and everything queued behind it.

cancel_queuedinterruptcancel_async_message

What

The interrupt control_request takes a new optional boolean cancel_queued that sweeps the whole main-thread queue along with the abort, so a remote UI can offer a "Stop means stop everything" button without walking uuids one at a time.

Details

When true, every uuid-stamped main-thread command still queued, and any already dequeued for the imminent turn, is cancelled alongside the abort and emits a terminal 'cancelled' lifecycle
The response returns those uuids under a new cancelled array, with still_queued always empty
A wrapper that wants per-uuid control leaves the flag false and keeps using cancel_async_message
Absent or false preserves the existing interrupt_receipt_v1 behaviour exactly

Usage

{"type":"control_request","request":{"subtype":"interrupt","cancel_queued":true}}

Evidence

When true, the interrupt also cancels every uuid-stamped main-thread command still in the queue

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