OpenAI have recently added MCP support for the realtime API: https://openai.com/index/introducing-gpt-realtime/
However the article links to a guide
http://platform.openai.com/docs/guides/realtime-mcp
Which does not actually exist. There’s really very little information at all on how to set this up. I also saw you can now save prompts and use a prompt ID but there’s also very little information on this.