This is not an AI agent, this is just a CLI for openrouter.ai with minor whistles.
"Agent-C: a 4KB AI agent" - my first thought was: obviously they did not fit any model to that size! They probably just wrote an http client, right? Wrong, they... call curl! Not even use curl API. Well, at least it handles encryption.
Bonus: command injection
OR_KEY="abc' ; rm -rf / ;" ./agent-c