CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT is a Claude Code environment variable. Added between v2.1.219 and v2.1.221 and still present in v2.1.294. It is listed in the official reference.

Status	Present in v2.1.294
Added	Added between v2.1.219 and v2.1.221
Category	Other
Official docs	Listed

How to set it

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

export CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT=<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_COMMENTS_AUTOREACT": "<value>"
  }
}

Release notes that mention it

Related variables

CLAUDE_CODE_ARTIFACT_COMMENTS
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_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
CLAUDE_CODE_ARTIFACT_ASSETS

Frequently asked questions

Which Claude Code version has CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT?

Added between v2.1.219 and v2.1.221 and still present in v2.1.294.

How do I set CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT?

Export it before starting Claude Code (export CLAUDE_CODE_ARTIFACT_COMMENTS_AUTOREACT=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.