onCancelAsyncMessage
A Claude Code settings key, read out of the shipped bundle. No mined inventory carries it: everything below comes from what this site has written about it.
Remote Control can now cancel a single queued message instead of only interrupting the whole turn
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.277.
In the changelogs
3Releases whose published page names onCancelAsyncMessage.
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v2.1.277
Remote bridge sessions can now cancel an in-flight async message
Remote Control can now cancel a single queued message instead of only interrupting the whole turn
named in this entry, found in this entry's text
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v2.1.277
New
onCancelAsyncMessagecallback threaded through Remote Control bridge session setupRemote Control session setup now threads through a new callback for cancelling a queued message
named in this entry, found in this entry's text
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v2.1.277
Remote bridge gains an onCancelAsyncMessage RPC handler
Remote clients can now cancel a queued background message instead of only interrupting an active turn
named in this entry, found in this entry's text
First cited
5The earliest release whose published evidence quoted onCancelAsyncMessage was v2.1.277, 18 Sep 2026. That is the oldest release this project wrote about it, so it is a floor on the name's age and not the release that introduced it. It is not a presence reading: which builds carried the name is the table below.
Presence across releases
0The miner has never read a build containing this name. It is here because a changelog entry of ours names it, which is evidence that it existed and not evidence of which releases carried it. The inventory starts at v2.1.138 and everything older than that was never mined.
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the settings key does. All settings keys.