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How can I configure an assistant to use an MCP server with the API? I don't see the mcp field in Create Assistant or Create Call APIs

What does the ~~fox~~ docs say? https://docs.vapi.ai/tools/mcp

the docs don't say anything about the API (https://docs.vapi.ai/api-reference/assistants/create) and the API reference does not show an mcp field

Well, its defined in tool https://docs.vapi.ai/api-reference/tools/create#response.body.mcp

ok, so it's not possible to create a transient MCP tool then? it's possible with other kind of tools.

I have tried to do this for the Asana MCP using the following code:

````
      tools: [
        {
          type: "mcp",
          name: "asana_mcp",
          server: { url: "https://mcp.asana.com/sse" },
        },
      ],
```

Their server requires pre-authorisation to work, but the VAPI docs suggest that you need an individualised URL for it to work. How might we be able to do that?