Server-Side Auto Mode Classifier in Claude Code

Auto mode's permission classifier now runs on Anthropic's servers for API and Enterprise users, so it no longer shows up on your bill.

Auto mode decides which tool calls need your approval. That decision used to run as a billed model call on your account, and now runs server-side at no charge
Applies to Claude API and Enterprise users and to Bedrock, Vertex, Foundry, and gateway setups, which now default to the server-side classifier
Set CLAUDE_CODE_AUTO_MODE_SERVER=0 to opt out on Bedrock, Vertex, Foundry, and gateways. Claude Code warns when it falls back to the billed path
A new Auto mode server row in /status shows which way the current session is running
Shipped in Claude Code v2.1.278

Teams running Claude Code in auto mode at volume, where classifier tokens were a line item nobody chose.

You are on the Claude API, Enterprise, Bedrock, Vertex, Foundry, or a gateway and want auto mode without the extra charge.

Engineering leads watching per-seat Claude Code spend.

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