Comma's Salix distributed harness enables always-on agents to run persistent eBPF programs that monitor events and filter them before escalating to the main agent loop, avoiding expensive model calls on every tick. Agents write small C programs compiled to eBPF that execute 24/7 on shared cluster nodes with minimal memory overhead and safety guarantees. Spinfoam, a userspace eBPF runtime written in Rust, executes these Loops asynchronously without requiring kernel privileges.