You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
SDK StreamingArea: what it touches
RemovedKind: in v2.1.247,
RemovedSection of the release
What
Claude Code no longer emits the stream message that told clients a long-running tool was still going and could be interrupted. The callback that delivered it has been pulled out of the dispatcher, the SDK message switch and the list of recognised message kinds, so any client subscribed to it simply stops receiving anything. Nothing replaces it as a signal: callers now infer tool state from the abort path instead.
Details
The event name interruptible_tool_in_progress does not appear anywhere in this build.
Working out why a tool was aborted now rests on whether the tool had actually begun running, and on the shell caller kind reported by shellCallerOf, which is one of inner, turn or agent.
The per-tool lookup of interrupt behaviour and the state updater that emitted the event were both deleted.
Where the tool scheduler used to update interruptible state, it now wakes waiting callers directly.
Evidence
shellCallerOf, interruptible_tool_in_progress
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
