CLAUDE_CODE_DIR_SYNC_STREAM
A Claude Code environment variable, read out of the shipped bundle. It was in the build from v2.1.248 and was gone by v2.1.285.
More environment variables get carried into remote sessions; none are set by default.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.248.
In the changelogs
3Releases whose published page names CLAUDE_CODE_DIR_SYNC_STREAM.
-
v2.1.285
Directory sync for cloud sessions and its environment variables removed
The directory-sync machinery for cloud sessions is gone, and its
CLAUDE_CODE_DIR_SYNC_*andCLAUDE_CODE_DISABLE_DIR_SYNCvariables no longer do anythingfound in this entry's text
-
v2.1.251
Directory-sync streaming keyed off an environment variable
Directory sync streams changes live unless you set an environment variable to turn streaming off.
named in this entry, found in this entry's text
-
v2.1.248
More environment variables carried into remote sessions
More environment variables get carried into remote sessions; none are set by default.
named in this entry, found in this entry's text
First cited
1The earliest release whose published evidence quoted CLAUDE_CODE_DIR_SYNC_STREAM was v2.1.251, 28 Aug 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
2Build by build
51One 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.