When using non-Anthropic models (Google Gemini, OpenAI GPT), the browser tool causes a 400 error even when explicitly disabled in config.

Error:
400 Invalid schema for function 'browser': schema must be a JSON Schema of 'type: "object"', got 'type: "None"'.

Config:

{
  "tools": {
    "browser": {
      "enabled": false
    }
  },
  "agent": {
    "model": "google/gemini-3-pro-preview"
  }
}

Expected: Disabled tools should not be sent to the model provider.

Actual: Browser tool schema is still included and causes validation errors with OpenAI/Google.

Environment: macOS, clawdbot 2026.1.4

Note: I have API keys for Google and OpenAI set up in .env in ~/.clawdbot/.env