Microsoft shipped Agent OS. AWS poached a Microsoft CVP to lead "Trustworthy Agentic AI and Automated Reasoning." NVIDIA embedded OpenShell into SAP. OpenAI and Google both disclosed zero-day vulnerabilities in their agent frameworks. Same direction. Same blind spot. The industry is building trust infrastructure for AI agents — but only half of it. What the Execution Layer Does Microsoft's Agent OS provides TrustedFunctionGuard — a gate that checks whether an agent is allowed to call a function before it executes. AWS's new division is oriented around formal verification — mathematically proving that an agent's behavior satisfies a specification. NVIDIA's OpenShell embeds audit logging at the infrastructure level. These are execution-layer solutions. They answer one question: "Can this agent do X?" Can it access this database? Can it execute this shell command? Can it call this API? The execution layer says yes or no, and logs the answer. This is necessary.…