Mastra•4w ago

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

Hi Mastra team! 👋 I'm having trouble getting tool arguments to populate in GeminiLiveVoice. Tools are called but args are always empty. Am I missing some configuration? Current Setup:

// 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?

// 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?

Tool definition:

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);
  }
}

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);
  }
}

What happens: ✅ Tools register successfully:

[GeminiLiveVoice] Tools added { toolCount: 3 }

[GeminiLiveVoice] Tools added { toolCount: 3 }

✅ Tools get called when user says "東京の天気を教えて":

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

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

❌ But args are always empty:

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

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

Questions: 1. Is voice.addTools(agent.tools) the correct setup? 2. Do I need additional configuration for argument extraction from speech? 3. Are there specific sessionConfig settings required for tool arguments? 4. Should I handle speech → arguments mapping manually? Using gemini-2.0-flash-live-preview-04-09 with latest Mastra. Any insights would be super helpful! 🙏

1 Reply

Mastra Triager•4w ago

📝 Created GitHub issue: https://github.com/mastra-ai/mastra/issues/10161 🔍 If you're experiencing an error, please provide a minimal reproducible example to help us resolve it quickly. 🙏 Thank you @ttsubasa for helping us improve Mastra!

GitHub

GeminiLiveVoice: Tool calls work but args always empty - Expected b...

This issue was created from Discord post 1439931524081385492: Hi Mastra team! 👋 I'm having trouble getting tool arguments to populate in GeminiLiveVoice. Tools are called but args are always em...

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

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