New features and 21 new voices in Voice Agent Builder

Agent transfers, custom MCPs, speech controls, and more.

21 new voices, multi-agent transfers, custom MCPs

Hi Russell,

We heard your feedback, and we've been rapidly adding new features to the Voice Agent Builder to support more use cases and give you more flexibility with your agent. New this week:

• 21 new flagship voices. Choose from new high-quality voices tailored to support, sales, and more. Listen here.

• Agent-to-agent transfers. Create workflow-specific agents and transfer between them while preserving the conversation's context.

• New tools and custom MCPs. Add tools for web search and X search, alongside custom MCPs and new connectors like HubSpot and SharePoint.

• Speech controls. Set custom pronunciation overrides, control speaking speed, and let your agent follow up with the user if they go silent.

Jump back in and build your voice agent now, with a US phone number on us.

Try It Free↗

SpaceXAI Team

© 2026 X.AI LLC

For questions contact support@x.ai