CLAUDE_TEST_NO_OPEN

Updated October 23, 2026 by Alex Sorokoletov

CLAUDE_TEST_NO_OPEN is a Claude Code environment variable. Added in v2.1.310 and still present in v2.1.310. It is not in the official reference.

Status	Present in v2.1.310
Added	Added in v2.1.310
Category	Other
Official docs	Not listed

How to set it

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

export CLAUDE_TEST_NO_OPEN=<value>
claude

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

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

Related variables

CLAUDE_CODE_ARTIFACT_AUTO_OPEN
CLAUDE_CODE_TEST_FIXTURES_ROOT: Root directory for test fixtures.
CLAUDE_CODE_ARTIFACT_OPEN_ACTION
CLAUDE_CODE_TEST_ALLOW_REAL_NETWORK
CLAUDE_CODE_TEST_NO_PWSH
CLAUDE_TEST_ESSENTIAL_TRAFFIC
CLAUDE_TEST_HEADED
CLAUDE_TEST_PROJECT_DIR

Frequently asked questions

Which Claude Code version has CLAUDE_TEST_NO_OPEN?

Added in v2.1.310 and still present in v2.1.310.

How do I set CLAUDE_TEST_NO_OPEN?

Export it before starting Claude Code (export CLAUDE_TEST_NO_OPEN=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.