Feature Request: sending message to agent without user role

[CUexter]

Is your feature request related to a problem? Please describe. I am now creating a custom function that calls a image generator. The image generation takes some time, and I don't want it to be blocking the conversation. I want to be able to notify the agent programmatically.

Describe the solution you'd like Able to change the role when running step function in agents

Describe alternatives you've considered Not yet. Is there?