CLAUDE_CODE_REPL

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_REPL is a Claude Code environment variable: Boolean toggle for the new native REPL path introduced by v2.1.113's native-binary launcher. Forces on or off regardless of entrypoint detection — the documented escape hatch for pinning to the old JS-launcher behavior while native-binary bugs shake out. Added between v2.1.87 and v2.1.88 and still present in v2.1.294. 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_REPL=<value>
claude

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

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

Release notes that mention it

• Claude Code v2.1.114 — Native Binary Launcher, /fewer-permission-prompts, and 20 New Environment Variables
• Claude Code v2.1.108 — 4 New Environment Variables: REPL Variants, Skill Discovery, and the Limits Reckoning
• Claude Code v2.1.100 — 3 New Environment Variables: Context Token Limits, Perforce VCS, and Script Capability Controls
• Claude Code v2.1.88 — 7 New Environment Variables: Mouse Control, REPL Mode, and Flicker-Free Rendering
• Claude Code Version Tracker: Undocumented Env Vars, Feature Gates & Models

Related variables

• CLAUDE_REPL_MODE: Sets the operating mode for the REPL interface.
• CLAUDE_REPL_MODE0: Prototype naming for the REPL mode configuration.
• CLAUDE_REPL_VARIANT: Selects which REPL implementation to load.
• CLAUDE_CODE_ARTIFACT_REPL
• CLAUDE_REPL_VERBOSE
• ANTHROPIC_BETAS: Comma-separated beta feature headers.
• ANTHROPIC_CUSTOM_HEADERS: Custom HTTP headers (newline-separated Key: Value).
• ANTHROPIC_FEDERATION_RULE_ID

Frequently asked questions

All variables, searchable: Claude Code environment variables.