awake-maroonA

Bug: `request-start` message not respected for MCP Tool calls

I've set this both through the API and through the UI and get the same results.

The same default "just a sec", "one moment", or whatever is played.

Repro steps:
Create assistant
Create and assign MCP tool to assistant that includes a custom request-start message.
Trigger an MCP call through the conversation (I made a toy "lookup-weather" tool for this)
Note that no matter what is specified in the request-start message, it is not respected. The default behavior is still used.


My MCP calls are fast, so I'd like to assign no request-start message and add a message for >500ms response time, but it doesn't seem like that's an option.
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