CLAUDE_INTERNAL_SESSION_TASK_LIST_ID

Updated October 31, 2026 by Alex Sorokoletov

CLAUDE_INTERNAL_SESSION_TASK_LIST_ID is a Claude Code environment variable: Carries a session's task list id into a relaunched process so it reuses the same task list; read once at startup and then cleared. Added in v2.1.311 and still present in v2.1.315. It is not in the official reference.

Status	Present in v2.1.315
Added	Added in v2.1.311
Category	Sessions
Official docs	Not listed

How to set it

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

export CLAUDE_INTERNAL_SESSION_TASK_LIST_ID=<value>
claude

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

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

Related variables

CLAUDE_BRIDGE_REATTACH_SESSION: Session identity used during bridge reconnection.
CLAUDE_CODE_BRIDGE_SESSION_ID
CLAUDE_CODE_CHILD_SESSION
CLAUDE_CODE_EMIT_SESSION_STATE_EVENTS: Controls whether Claude Code emits session state change events.
CLAUDE_CODE_EVAL_INTERVIEW_SESSION: When set, marks an eval interview session and suppresses the default auto-publishing of the eval report.
CLAUDE_CODE_FORCE_SESSION_PERSISTENCE
CLAUDE_CODE_POST_FOR_SESSION_INGRESS_V2: Use POST-based session ingress v2.
CLAUDE_CODE_REMOTE_SESSION_ID: Remote session identifier.

Frequently asked questions

What does CLAUDE_INTERNAL_SESSION_TASK_LIST_ID do?

Carries a session's task list id into a relaunched process so it reuses the same task list; read once at startup and then cleared.

Which Claude Code version has CLAUDE_INTERNAL_SESSION_TASK_LIST_ID?

Added in v2.1.311 and still present in v2.1.315.

How do I set CLAUDE_INTERNAL_SESSION_TASK_LIST_ID?

Export it before starting Claude Code (export CLAUDE_INTERNAL_SESSION_TASK_LIST_ID=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.