Pi is the coding agent that made me love vibe coding
Pi is a minimalist terminal harness. Short system prompt, nothing extra, and it stays snappy even when I'm SSH'd into a PC at home from bar wifi. The speed isn't vibes; it's the absence of everything Pi doesn't load.
It's also the first agent I'd hand to a beginner before OpenChamber, and you extend it by talking to it rather than by adding configuration. I only pay for the DeepSeek API, and I cover how to install it and the package trap to watch for.