CLAUDE_CODE_DIR_SYNC_DISABLE_ANCHORING
A Claude Code environment variable, read out of the shipped bundle. It was in the build from v2.1.239 and was gone by v2.1.284.
Cloud file sync writes through directory handles so a swapped symlink can't redirect it, and says when that's unavailable.
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.239.
In the changelogs
6Releases whose published page names CLAUDE_CODE_DIR_SYNC_DISABLE_ANCHORING.
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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
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v2.1.283
Directory sync refuses to place files on machines that cannot anchor folders
Directory sync now gives up instead of placing files by name when folder anchoring is unavailable, unless CLAUDE_CODE_DIR_SYNC_DISABLE_ANCHORING is set
found in this entry's text
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v2.1.281
dir-sync: Windows anchoring via a win32 handle backend
On Windows, dir-sync can now anchor its root folder through a native Windows handle, with fallbacks when that is not possible
found in this entry's text
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v2.1.242
Archive sync explains conflicts, deletes and skipped files in plain language
Archive sync now tells you plainly about conflicts, restored deletes and files too large to sync.
found in this entry's text
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v2.1.239
Directory sync places files without following symlinks, and tells you when it can't
Cloud file sync writes through directory handles so a swapped symlink can't redirect it, and says when that's unavailable.
named in this entry, found in this entry's text
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v2.1.239
Directory-sync anchoring can be switched off, plus seven dir-sync variables now stripped from child processes
CLAUDE_CODE_DIR_SYNC_DISABLE_ANCHORING turns off path anchoring, and seven sync variables are now stripped from child processes.
named in this entry, found in this entry's text
First cited
3The earliest release whose published evidence quoted CLAUDE_CODE_DIR_SYNC_DISABLE_ANCHORING was v2.1.239, 21 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
59One 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.