CLAUDE_CODE_ATTACHMENTS_BY_PATH
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.300, including the newest one read.
Setting CLAUDE_CODE_ATTACHMENTS_BY_PATH stops Claude Code uploading files it sends you, enables the send-file tool and keeps its results in subagents
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.300.
In the changelogs
3Releases whose published page names CLAUDE_CODE_ATTACHMENTS_BY_PATH.
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v2.1.300
CLAUDE_CODE_ATTACHMENTS_BY_PATHturns off file uploads for files Claude sendsSetting
CLAUDE_CODE_ATTACHMENTS_BY_PATHstops Claude Code uploading files it sends you, enables the send-file tool and keeps its results in subagentsfound in this entry's text, named in this entry
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v2.1.300
New environment variable turns on file sending and keeps its results in subagents
Setting CLAUDE_CODE_ATTACHMENTS_BY_PATH turns on the send-file tool, skipping its usual checks, and keeps its results in subagents
found in this entry's text, named in this entry
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v2.1.300
Setting
CLAUDE_CODE_ATTACHMENTS_BY_PATHmakes Claude Code act as a remote sessionClaude Code now treats a session as remote whenever
CLAUDE_CODE_ATTACHMENTS_BY_PATHis setfound in this entry's text, named in this entry
First cited
3The earliest release whose published evidence quoted CLAUDE_CODE_ATTACHMENTS_BY_PATH was v2.1.300, 14 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
9One 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.