CLAUDE_CODE_USER_DELEGATED_SESSION
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.323, including the newest one read.
CLAUDE_CODE_USER_DELEGATED_SESSION and CLAUDE_CODE_USER_DELEGATED_SESSION_ANY_CHECK_MODEL are now copied to the processes Claude Code starts
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.323.
In the changelogs
2Releases whose published page names CLAUDE_CODE_USER_DELEGATED_SESSION.
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v2.1.323
Two more user delegated session variables are passed to spawned processes
CLAUDE_CODE_USER_DELEGATED_SESSIONandCLAUDE_CODE_USER_DELEGATED_SESSION_ANY_CHECK_MODELare now copied to the processes Claude Code startsfound in this entry's text
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v2.1.323
Remote-control child sessions inherit the delegated-session setting and skip bad output lines
Child sessions started for remote control now receive CLAUDE_CODE_USER_DELEGATED_SESSION, and one bad output line no longer breaks them
found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_USER_DELEGATED_SESSION was v2.1.323, 12 Nov 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
1Build by build
1One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
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 environment variable does. All environment variables.