Provide ability to select/switch custom agents in a session

[DonJayamanne]

Currently the SDK doesn't seem to provide this functionality, (from what I can tell this cannot be done at session creation either)

[github-actions]

Thanks for opening this issue! 👋

I've labeled this as an enhancement since you're requesting the ability to switch custom agents dynamically within an existing session.

To help us better understand your use case, could you provide:

1. Which SDK(s) are you using? (Node.js, Python, Go, or .NET)
2. Your specific scenario — what would trigger switching agents mid-session?
3. Expected API — would you envision something like session.setAgent(newAgent) or session.switchAgent('agent-name')?

This will help us design the right solution for your needs!

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