AI agents process inputs from everywhere—APIs, documents, calendars, webhooks, other agents. Each channel is an attack surface. Unlike traditional exploits targeting code, agentic attacks target meaning: tricking systems that interpret and act on information. A calendar invite triggers code execution. A document rewrites agent instructions. These aren't hypotheticals—they're documented attack patterns. AI Security Guard provides pre-flight content scanning with five deterministic analyzers. When something looks wrong, agents get explanations, not just flags. Operators get visibility across all inputs. Privacy-first: zero data retention, no third-party sharing.