CLAUDE_CODE_CCR_WORKER_SOCKET

Updated October 23, 2026 by Alex Sorokoletov

CLAUDE_CODE_CCR_WORKER_SOCKET is a Claude Code environment variable. Added in v2.1.299 and still present in v2.1.310. It is not in the official reference.

Status	Present in v2.1.310
Added	Added in v2.1.299
Category	Other
Official docs	Not listed

How to set it

For one session, export it in the shell that starts Claude Code:

export CLAUDE_CODE_CCR_WORKER_SOCKET=<value>
claude

To apply it to every session, add it to the env object of a settings file:

// ~/.claude/settings.json
{
  "env": {
    "CLAUDE_CODE_CCR_WORKER_SOCKET": "<value>"
  }
}

Related variables

CLAUDE_CODE_MESSAGING_SOCKET
CLAUDE_CODE_USE_CCR_V2: Use Claude Code Router v2 for cowork sessions.
CLAUDE_CODE_WORKER_CHECKIN_SCHEDULE
CLAUDE_CODE_WORKER_EPOCH: Worker epoch for versioning internal state.
CLAUDE_CODE_CCR_EARLY_HYDRATE_PREFETCH
CLAUDE_CODE_CCR_EARLY_SYNC_AFTER_SETTINGS_REFUSAL
CLAUDE_CODE_CCR_EVENT_FLUSH_POLICY
CLAUDE_CODE_CCR_FOLD_FIRST_TURN_RESCAN

Frequently asked questions

Which Claude Code version has CLAUDE_CODE_CCR_WORKER_SOCKET?

Added in v2.1.299 and still present in v2.1.310.

How do I set CLAUDE_CODE_CCR_WORKER_SOCKET?

Export it before starting Claude Code (export CLAUDE_CODE_CCR_WORKER_SOCKET=value), or add it to the "env" object in ~/.claude/settings.json to apply it to every session.

All variables, searchable: Claude Code environment variables.