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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 v2.1.219

New protocol capability interrupt_cancel_queued_v1 on system/init

Under the hood
Useful2 Signal0
SDK Protocol not in their notes

Sessions now advertise a capability string so clients can detect queue-cancelling interrupts without version checks.

interrupt_cancel_queued_v1
What

The capabilities array advertised at init gains a second entry next to interrupt_receipt_v1, letting SDK consumers feature-detect cancel_queued support instead of sniffing the CLI version.

Details
  • Capability string is interrupt_cancel_queued_v1
  • The capability list is built unconditionally in this build, so it is present for every session
  • Pairs with the cancel_queued field on the interrupt control_request
Evidence

'interrupt_cancel_queued_v1' = the interrupt control_request honors cancel_queued:true

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 v2.1.219 →