Agent-native stack gives AI agents digital identity

The "Agent Stack" represents the maturation of the agentic ecosystem from experimental scripts to production-ready digital entities. It introduces identity primitives like AgentMail and AgentPhone for persistent contact, sandboxed execution environments from Daytona and E2B for "computer use," and financial layers like Skyfire and Sponge for autonomous transactions. This shift toward agent-first APIs signals a transition where agents operate as first-class citizens in the digital economy.