CLAUDE_AGENTS_AUTO_RELAUNCHED_AT

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_AGENTS_AUTO_RELAUNCHED_AT is a Claude Code environment variable: Timestamp set when the agent fleet was automatically relaunched after a crash. Downstream consumers can detect state that predates the relaunch and invalidate stale caches accordingly. Added between v2.1.118 and v2.1.123 and still present in v2.1.294. It is not in the official reference.

Status	Present in v2.1.294
Added	Added between v2.1.118 and v2.1.123
Category	Agents and subagents
Official docs	Not listed

How to set it

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

export CLAUDE_AGENTS_AUTO_RELAUNCHED_AT=<value>
claude

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

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

Release notes that mention it

Related variables

CLAUDE_AGENT_SDK_DISABLE_BUILTIN_AGENTS: Disable built-in agent types.
CLAUDE_AGENTS_SELECT: Selects which agents from a fleet configuration are active for this session or job.
CLAUDE_CODE_DISABLE_AGENTS_FLEET: Kill switch for the entire agent fleet subsystem — no selection, no auto-relaunch, no fleet coordination.
CLAUDE_CODE_DISABLE_EXPLORE_PLAN_AGENTS
CLAUDE_CODE_EXPERIMENTAL_OBSERVER_AGENTS: Agents that watch a session rather than act in it.
CLAUDE_CODE_WORKFLOW_MAX_CONCURRENT_AGENTS
CLAUDE_CODE_WORKFLOW_SIZE_WARNING_AGENTS
CLAUDE_AGENT: Short-form identifier for the current agent, used in inter-agent messaging and log attribution.

Frequently asked questions

What does CLAUDE_AGENTS_AUTO_RELAUNCHED_AT do?

Timestamp set when the agent fleet was automatically relaunched after a crash. Downstream consumers can detect state that predates the relaunch and invalidate stale caches accordingly.

Which Claude Code version has CLAUDE_AGENTS_AUTO_RELAUNCHED_AT?

Added between v2.1.118 and v2.1.123 and still present in v2.1.294.

How do I set CLAUDE_AGENTS_AUTO_RELAUNCHED_AT?

Export it before starting Claude Code (export CLAUDE_AGENTS_AUTO_RELAUNCHED_AT=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.