pro-code copilot agent

Question

We know that we can develop PRO-CODE Copilot agent in  VS-code using Teams-AI-library.

So if I develop one such agent from scratch, completely in VS-code with teams-ai-lib,  I know that we can provision, package and publish the agent  from VS-code.

My question is,

In this whole execution,  do I need to spin up  a middleman in the name of Azure Bot Service Instance in  my Azure Subscription  ?

OR

The agent once hosted on my server  can be directly invoked from  MS-Teams client  WITHOUT any such bot-service-instance   ??

 Thanks