CLAUDE_CODE_RESUME_REASON

Updated October 23, 2026 by Alex Sorokoletov

CLAUDE_CODE_RESUME_REASON is a Claude Code environment variable. Added between v2.1.266 and v2.1.269 and still present in v2.1.310. It is not in the official reference.

How to set it

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

export CLAUDE_CODE_RESUME_REASON=<value>
claude

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

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

Related variables

• CLAUDE_CODE_RESUME_FROM_SESSION: Instructs Claude Code to bootstrap a new session's context from an existing session ID.
• CLAUDE_CODE_RESUME_INTERRUPTED_TURN: Resume an interrupted agent turn.
• CLAUDE_CODE_RESUME_INTERRUPTED_TURN_MAX_AGE_MS
• CLAUDE_CODE_RESUME_PROMPT: Set the prompt injected when resuming a session.
• CLAUDE_CODE_RESUME_THRESHOLD_MINUTES: Sets the time window (in minutes) during which a session is eligible for automatic resume.
• CLAUDE_CODE_RESUME_PROMPT00
• CLAUDE_CODE_RESUME_SESSIONSTART_HOOKS_WAIT_MS
• CLAUDE_CODE_RESUME_SHOWS_CUT_OFF_CALLS

Frequently asked questions

All variables, searchable: Claude Code environment variables.