susi is described as "The RSI swarm AI OS for hosting, provisioning, and managing any local and cloud AI ecosystem — a Tier S evidence-gated agent-of-agents substrate on your machine (not a replacement host OS or a chatbot wrapper; Mandate 45)." It runs a persistent host daemon with stable network ports, bearer-authenticated HTTP, and a swarm that requires evidence before declaring mission completion. The system supports mounting models, agents, and MCP tools as capabilities, with open admission for OpenAI-compatible, MCP, and protocol-peer integrations. It orchestrates a consensus Swarm, grounds work in structured Evidence, cross-examines with a Truth transformer, cryptographically audits actions into an immutable HMAC chain, and sandboxes untrusted Wasm plugins. Automation is first-class via `susi automate <intent>`, and zero-config discovery runs on daemon start. The product operates on Linux, macOS, and WSL, with native Windows support via install.ps1.