CCR_AGENT_PROXY_TOKEN_FILE_DESCRIPTOR
A Claude Code environment variable, read out of the shipped bundle. It has been in the build since v2.1.295, including the newest one read.
Claude Code now recognises CCR_AGENT_PROXY_TOKEN_FILE_DESCRIPTOR as a way to receive the agent proxy credential
Not Anthropic's. This is the line from the earliest changelog entry here that named it, v2.1.290.
In the changelogs
2Releases whose published page names CCR_AGENT_PROXY_TOKEN_FILE_DESCRIPTOR.
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v2.1.295
Session tunnel startup reads sign-in and proxy tokens from a file descriptor
Started with
--session-tunnel, Claude Code can read its sign-in token and an agent proxy token from a launcher-supplied channelfound in this entry's text
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v2.1.290
New environment variable for passing the remote agent proxy token
Claude Code now recognises CCR_AGENT_PROXY_TOKEN_FILE_DESCRIPTOR as a way to receive the agent proxy credential
found in this entry's text
First cited
2The earliest release whose published evidence quoted CCR_AGENT_PROXY_TOKEN_FILE_DESCRIPTOR was v2.1.290, 5 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
1One 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.