What does zero trust change about agent runtime design?

Zero trust changes agent runtime design by removing implicit trust between agents, tools, services, and networks. Each request should be authenticated, authorized, encrypted where appropriate, and logged. For AI agents, this matters because agents may act autonomously and call tools with real business impact. A zero-trust runtime should give each agent a workload identity, enforce policy at service and tool boundaries, and make activity auditable. Diagrid Catalyst is positioned around this model with cryptographic identity, mTLS, policy controls, and secure communication for agents and MCP servers.