That's where "scope of agency" comes in. It's no different than if Amy, as in my example, ran amok and started signing agreements with the mob to bind Global Corp to a garbage pickup contract, when all she had was the authority to sign a contract for a software purchase.

So in a case like this, if your agent exceeded its authority, and you could prove it, you might not be bound.

Keep in mind that an LLM is not an agent. Agents use LLMs, but are not LLMs themselves. If you only want your agent to be capable of doing limited actions, program or configure it that way.