onProcessSpawned
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.
Claude Code's per-turn timing adds steps for refreshing tools, model checks, building the request, and each kind of resent request
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.286.
In the changelogs
2Releases whose published page names onProcessSpawned.
-
v2.1.318
The SDK's
onProcessSpawnedcallback now reports how long the start tookThe SDK now passes
spawnSyncMs, the time taken to start the Claude Code process, as a second argument toonProcessSpawnednamed in this entry, found in this entry's text
-
v2.1.286
Turn timing now measures tool refresh, request building and resent requests
Claude Code's per-turn timing adds steps for refreshing tools, model checks, building the request, and each kind of resent request
found in this entry's text
First cited
2The earliest release whose published evidence quoted onProcessSpawned was v2.1.286, 30 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.