MCP's July 2026 Overhaul Fixes Scaling But Leaves Agent Identity and Long-Running Workflows Unsolved

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The MCP protocol received its largest update on July 28, 2026, dropping persistent sessions and the initialize handshake in favour of a stateless design where request metadata travels in a per-call meta field. The change eliminates sticky routing requirements, making load balancing simpler and enabling backends like Lambda and Cloud Run to serve agent traffic more efficiently. However, the revision does not address two critical blockers for enterprise deployments: establishing a verified identity for the agent acting on a user's behalf, and maintaining workflow state across processes that span days or longer. On AWS, components such as AgentCore Identity, Cedar-based policy evaluation, and Step Functions can be composed to partially fill these gaps, but no single service delivers a complete solution. The core unsolved challenge remains deciding which principal each agent represents and what actions it is permitted to commit to, a problem that falls outside MCP's scope and is unlikely to be resolved by future protocol revisions alone.

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