CLAUDE_CODE_SKIP_MANTLE_AUTH

Updated October 13, 2026 by Alex Sorokoletov

CLAUDE_CODE_SKIP_MANTLE_AUTH is a Claude Code environment variable: Skips Mantle authentication. This is the escape hatch for environments where Mantle is enabled at the org level but a specific workflow needs direct API access — debugging auth issues, running in air-gapped environments, or testing against non-Mantle endpoints. Added in v2.1.94 and still present in v2.1.294. It is listed in the official reference.

How to set it

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

export CLAUDE_CODE_SKIP_MANTLE_AUTH=<value>
claude

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

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

Release notes that mention it

• Claude Code v2.1.96 — No New Environment Variables: Bedrock Auth Hotfix
• Claude Code v2.1.94 — 5 New Environment Variables: Mantle Authentication, MCP Sandboxing, and Team Onboarding
• Claude Code Version Tracker: Undocumented Env Vars, Feature Gates & Models

Related variables

• CLAUDE_CODE_SKIP_ANTHROPIC_AWS_AUTH: Skips credential resolution for the Anthropic AWS provider.
• CLAUDE_CODE_SKIP_ANTHROPIC_GOOGLE_CLOUD_AUTH: The skip-auth companion to the toggle above, grouped in the auth-bypass list with SKIP_BEDROCK_AUTH, SKIP_VERTEX_AUTH, SKIP_FOUNDRY_AUTH, SKIP_ANTHROPIC_AWS_AUTH, and SKIP_MANTLE_AUTH.
• CLAUDE_CODE_SKIP_BEDROCK_AUTH: Skip Bedrock authentication.
• CLAUDE_CODE_SKIP_FOUNDRY_AUTH: Skip Foundry authentication.
• CLAUDE_CODE_SKIP_VERTEX_AUTH: Skip Vertex AI authentication.
• ANTHROPIC_BEDROCK_MANTLE_BASE_URL
• ANTHROPIC_FOUNDRY_AUTH_TOKEN
• CLAUDE_CODE_SKIP_AWS_CRED_CACHE

Frequently asked questions

All variables, searchable: Claude Code environment variables.