CLAUDE_CODE_ARTIFACT_FD

Updated October 14, 2026 by Alex Sorokoletov

CLAUDE_CODE_ARTIFACT_FD is a Claude Code environment variable. Added between v2.1.269 and v2.1.283 and still present in v2.1.295. 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_ARTIFACT_FD=<value>
claude

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

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

Related variables

• CLAUDE_CODE_ARTIFACT: Turns on Artifacts, with companions for its API endpoint, direct upload, and MCP exposure.
• CLAUDE_CODE_ARTIFACT_AUTO_OPEN
• CLAUDE_CODE_ARTIFACT_COMMENTS
• CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT
• CLAUDE_CODE_ARTIFACT_DELETE: Enables the delete-Artifact path (owner-only, requires confirmation, blocked in plan mode).
• CLAUDE_CODE_ARTIFACT_PREVIEW_EMULATOR: Pins the artifact-preview emulator on (true) or off (false); left unset, a feature flag decides.
• CLAUDE_CODE_ARTIFACT_VERSIONS: When set, the session can list and read an artifact's earlier versions; without it, a session reports that an artifact's earlier versions are not available.
• CLAUDE_ARTIFACT_HOST_GRANT

Frequently asked questions

All variables, searchable: Claude Code environment variables.