CLAUDE_PROJECT_UUID

Updated October 14, 2026 by Alex Sorokoletov

CLAUDE_PROJECT_UUID is a Claude Code environment variable. Added between v2.1.143 and v2.1.212 and still present in v2.1.295. It is not in the official reference.

Status	Present in v2.1.295
Added	Added between v2.1.143 and v2.1.212
Category	Other
Official docs	Not listed

How to set it

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

export CLAUDE_PROJECT_UUID=<value>
claude

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

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

Related variables

CLAUDE_CODE_ACCOUNT_UUID: Pre-configured account UUID.
CLAUDE_CODE_ORGANIZATION_UUID: Organization UUID.
CLAUDE_CODE_PROJECT_DIR_NAME
CLAUDE_PROJECT_DIR: Override project directory.
CLAUDE_TEST_PROJECT_DIR
ANTHROPIC_BETAS: Comma-separated beta feature headers.
ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).
ANTHROPIC_FEDERATION_RULE_ID

Frequently asked questions

Which Claude Code version has CLAUDE_PROJECT_UUID?

Added between v2.1.143 and v2.1.212 and still present in v2.1.295.

How do I set CLAUDE_PROJECT_UUID?

Export it before starting Claude Code (export CLAUDE_PROJECT_UUID=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.