Sentinel is an MCP server that scores AI agent responses before they reach a user — a trust layer an agent calls mid-turn, not a dashboard someone checks after the fact.
Sentinel is an MCP server that scores AI agent responses **before** they reach a user — a trust layer an agent calls mid-turn, not a dashboard someone checks after the fact. An agent (or the orchestrator wrapping it) calls a Sentinel tool with the response it's about to send plus the context it was grounded in; Sentinel returns a verdict the caller can act on —