CLAUDE_CODE_SPAWNED_BY_SERVER
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.307, including the newest one read.
The Artifact tool's setting entry no longer names CLAUDE_CODE_DISABLE_ARTIFACT, though the variable name still appears elsewhere in Claude Code
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.307.
In the changelogs
2Releases whose published page names CLAUDE_CODE_SPAWNED_BY_SERVER.
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v2.1.307
CLAUDE_CODE_DISABLE_ARTIFACTdropped from the Artifact tool's setting entryThe Artifact tool's setting entry no longer names
CLAUDE_CODE_DISABLE_ARTIFACT, though the variable name still appears elsewhere in Claude Codefound in this entry's text
-
v2.1.307
Changed detection of sessions started by a server or over SSH
Claude Code treats a session as server- or SSH-started when CLAUDE_CODE_SPAWNED_BY_SERVER, CLAUDE_SSH_DAEMON_CHILD or CLAUDE_SSH_RUN_DIR is set
found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_SPAWNED_BY_SERVER was v2.1.307, 21 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
1Build by build
2One 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.