CLAUDE_CODE_BASE_REF
Updated by Alex Sorokoletov
CLAUDE_CODE_BASE_REF is a Claude Code environment variable: Git base ref for diff operations. Present since v2.1.69 or earlier and still present in v2.1.294. It is not in the official reference.
| Status | Present in v2.1.294 |
|---|---|
| Added | Present since v2.1.69 or earlier |
| 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_BASE_REF=<value>
claudeTo apply it to every session, add it to the env object of a settings file:
// ~/.claude/settings.json
{
"env": {
"CLAUDE_CODE_BASE_REF": "<value>"
}
}Release notes that mention it
Related variables
CLAUDE_BASE: Likely overrides the base URL or base configuration path for Claude Code.CLAUDE_CODE_BASE_REFS: Specifies base git references (branches, tags, or SHAs) for diff comparison when Claude Code operates in a worktree or feature branch.CLAUDE_RUNNER_REPO_REFANTHROPIC_BETAS: Comma-separated beta feature headers.ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).ANTHROPIC_FEDERATION_RULE_IDANTHROPIC_ORGANIZATION_IDANTHROPIC_WORKSPACE_ID
Frequently asked questions
What does CLAUDE_CODE_BASE_REF do?
Git base ref for diff operations
Which Claude Code version has CLAUDE_CODE_BASE_REF?
Present since v2.1.69 or earlier and still present in v2.1.294.
How do I set CLAUDE_CODE_BASE_REF?
Export it before starting Claude Code (export CLAUDE_CODE_BASE_REF=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.