CLAUDE_CODE_SIMPLETON

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_SIMPLETON is a Claude Code environment variable: Renamed to CLAUDE_CODE_SIMPLE. Its release history is not tracked here. It is not in the official reference.

Status	Present in v2.1.294
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_SIMPLETON=<value>
claude

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

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

Release notes that mention it

Related variables

ANTHROPIC_BETAS: Comma-separated beta feature headers.
ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).
ANTHROPIC_FEDERATION_RULE_ID
ANTHROPIC_ORGANIZATION_ID
ANTHROPIC_WORKSPACE_ID
BETA_TRACING_ENDPOINT: Custom endpoint for beta tracing.
CLAUDE_AFK_COUNTDOWN_MS
CLAUDE_AI_ORIGIN: Overrides the base URL for Claude AI authentication endpoints.

Frequently asked questions

What does CLAUDE_CODE_SIMPLETON do?

Renamed to CLAUDE_CODE_SIMPLE

Which Claude Code version has CLAUDE_CODE_SIMPLETON?

Its release history is not tracked here.

How do I set CLAUDE_CODE_SIMPLETON?

Export it before starting Claude Code (export CLAUDE_CODE_SIMPLETON=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.