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1. **Adding metadata to ToolCallResult and ToolCallResultMessage**: You can now include optional metadata in tool call results and messages. This allows you to send additional context or information to clients alongside standard tool responses.

2. **Adding `tool.completed` client message type**: Assistants can now handle a new client message type, `tool.completed`. This enables you to notify clients when a tool has finished executing.

3. **Customizable assistant messages via `message` property in [ToolCallResult](https://api.vapi.ai/api#:~:text=ToolCallResult)**: You can now specify exact messages for the assistant to say upon tool completion or failure using the `message` property. This gives you greater control over user interactions by allowing custom, context-specific responses.