preserveToolUseResultInSubagents
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.
The Agent tool can now keep tool results inside subagents instead of stripping them, controlled by a server-side switch
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.281.
In the changelogs
2Releases whose published page names preserveToolUseResultInSubagents.
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v2.1.288
Remote switches now control two subagent and tool-result behaviours
Two remote switches, off by default, control keeping a file-sending tool's results in subagents and how unanswered tool requests are found
found in this entry's text
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v2.1.281
Agent tool: preserving tool results in subagents is dark-launched
The Agent tool can now keep tool results inside subagents instead of stripping them, controlled by a server-side switch
named in this entry, found in this entry's text
First cited
1The earliest release whose published evidence quoted preserveToolUseResultInSubagents was v2.1.288, 2 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.