`browser_stagehand_navigate` doesn't return any `content`

[calclavia]

There seems to be a bug when using Browserbase/Stagehand MCP where some functions don't return content, so it crashes due to being incompatible with MCP spec.

Model function call:

{
  "id": "msg_01Ga9frjsasGrkLE92uyRiKo",
  "type": "message",
  "role": "assistant",
  "model": "claude-3-5-sonnet-20241022",
  "content": [
    {
      "type": "tool_use",
      "id": "toolu_01TwYMqUF7fVK9QYLJP6zcyt",
      "name": "browser_stagehand_navigate",
      "input": {
        "url": "https://github.com/modelcontextprotocol/servers/blob/main/src/gdrive"
      }
    }
  ],
  "stop_reason": "tool_use",
  "stop_sequence": null,
  "usage": {
    "input_tokens": 173,
    "cache_creation_input_tokens": 0,
    "cache_read_input_tokens": 3051,
    "output_tokens": 108
  }
}

Error:

                const error = new ZodError(ctx.common.issues);
                              ^

ZodError: [
  {
    "code": "invalid_type",
    "expected": "array",
    "received": "undefined",
    "path": [
      "content"
    ],
    "message": "Required"
  }
]