Anthropic's Mythos Preview was compromised by a private Discord group on the day of its public release through a third party vendor environment, after being distributed across 40 companies and their associated contractor networks. The breach was enabled by failures across vendor access, identity controls and contractual oversight. The article notes that only one in five enterprises holds a mature governance model for autonomous agents despite accelerating deployment. To address such vulnerabilities, four governance imperatives are outlined: access control and least privilege, requiring agents to operate with minimum permissions; auditability and decision traceability, capturing inputs, model versions, prompts, intermediate reasoning artifacts and final actions; human-in-the-loop and fail-safe controls, instituting gating workflows for high-risk decisions; and ensuring operators can pause or intervene.