GeminiLiveVoice: Tool calls work but args always empty - Expected behavior?

// Agent setup
const agent = new Agent({
  tools: { getWeather },
  voice: new GeminiLiveVoice({
    vertexAI: true,
    model: 'gemini-2.0-flash-live-preview-04-09',
    // ... other config
  })
});

// Tool registration
voice.addTools(agent.tools);  // Is this the correct way?

getWeather: {
  description: "Get weather information for a specific location",
  parameters: z.object({
    location: z.string().describe("Location to get weather for")
  }),
  execute: async ({ location }) => {
    return await fetchWeather(location);
  }
}

[GeminiLiveVoice] Tools added { toolCount: 3 }

[GeminiLiveVoice] Processing tool call {
  toolName: 'getWeather',
  toolArgs: {},
  toolId: '6e580cf7-6c24-46b1-9beb-hogehoge'
}

Tool validation failed:
- location: Invalid input: expected string, received undefined
Provided arguments: {}