Can the host server's service agent be used?

In theory yes, just make sure you expose the containers network (check the docker compose)

I'm currently running a self-hosted deployment. Can the host server's service agent be used?

Hi @<1575656665519230976:profile|SkinnyBat30>
Streamlit apps are backend run (i.e. the python code drives the actual web app)
This means running your Tasks code and exposing the web app (i.e. http) streamlit.
This is fully supported with ClearML, but unfortunately only in the paid tiers 😞
You can however run your Task with an agent, make sure the agent's machine is accessible and report the full IP+URL as a hyper-parameter or property, and then use that to access your streamlit app,
wdyt?