forkSubagentDisabled
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.
Fork mode can now be turned off with the forkSubagentDisabled setting, and a server-controlled switch can also turn it off
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.302.
In the changelogs
2Releases whose published page names forkSubagentDisabled.
-
v2.1.302
New
forkSubagentDisabledsetting turns off fork modeFork mode can now be turned off with the
forkSubagentDisabledsetting, and a server-controlled switch can also turn it offnamed in this entry, found in this entry's text
-
v2.1.302
Claude is told when to fork the conversation into a subagent
The Agent tool's instructions include a 'When to fork' section on forked subagents, which you can turn off with an environment variable or setting
found in this entry's text
First cited
1The earliest release whose published evidence quoted forkSubagentDisabled was v2.1.302, 16 Oct 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.