Workflows = automations that use LLMs (or a sequence of LLM calls) at some point. Eg. "Classify this input and respond with JSON"

Is Siri or Google Assistant an "agent"? I would say no it's basically an LLM with function calling. Eg. "What's the weather -> uses predefined weather api"

Agents would need to be able to self integrate, which is impossible without giving them full computer use or admin permissions - which creates massive security risks nobody seems to be talking about.