Llm

Yosh is Bash with an integrated LLM, built by Fil Pizlo on Fil-C. I wanted its yo command in my zsh without building a custom shell, so I ported the interaction model in one long day, then spent a second round closing the gaps: streaming, cancellation, plans, a widget, capture, and a native module. Including the prefill footgun I found in my own first release.

Instead of picking one model per task, I made three machines cooperate: a big thinking model for primary reasoning, a fast local 27B for subagent loops and images, a router with automatic failover in front of everything, and shared agent memory. Total cost: electricity. Here is the full architecture, the benchmarks, and the lessons learned the hard way.