Sentinel AgentOS makes AI agents reliable. Three layers, zero LLM dependency 🛡️Guard — Pre/post validation for every tool call. Schema, Risk, Snapshot and Verify gates catch errors deterministically 🧠Memory — Three-tier memory: Working, Episodic (auto-summarized), Semantic (persistent facts). Auto-compression. 📊Evaluation — Pre-exec scoring, runtime profiling, post-exec verification, implicit feedback. Full JSONL audit trail Open source (MIT), TypeScript, framework-agnostic. Install in 5 min