Agreed. But I'd place more value on searching for other agents when I know none.

From this thread we can see there is not a fixed concept of what meets the agent criteria. If I knew zero other agents, I'd be more inclined to spend more effort searching or perhaps be a little more flexible with my interpretation of what an agent might be.

Of course tricking yourself into solipsism or Wilson worship is a conceivable failure mode, but I don't think it's likely here.