CLAUDE_CODE_CONFIG_PROBE
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.286, including the newest one read.
When the CLAUDE_CODE_CONFIG_PROBE environment variable is set, Claude Code skips two of the routines it normally runs at startup
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.286.
In the changelogs
3Releases whose published page names CLAUDE_CODE_CONFIG_PROBE.
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v2.1.286
New
CLAUDE_CODE_CONFIG_PROBEvariable skips two startup stepsWhen the
CLAUDE_CODE_CONFIG_PROBEenvironment variable is set, Claude Code skips two of the routines it normally runs at startupfound in this entry's text, named in this entry
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v2.1.286
New CLAUDE_CODE_CONFIG_PROBE variable stops cloud credential refresh commands
With CLAUDE_CODE_CONFIG_PROBE set, Claude Code skips the awsAuthRefresh and gcpAuthRefresh commands instead of running them
found in this entry's text, named in this entry
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v2.1.286
Three more environment variables are read at startup
Claude Code now reads
CLAUDE_CODE_CONFIG_PROBE,CLAUDE_CODE_ARTIFACT_SHAREandCLAUDE_CHROME_TAB_GROUP_KEYwhen it startsfound in this entry's text
First cited
2The earliest release whose published evidence quoted CLAUDE_CODE_CONFIG_PROBE 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
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.