A September 16 architecture brief on the Model Context Protocol frames three patterns teams are actually shipping: Tool Mesh (discover → select → execute against shared MCP servers), Agent Mesh (plan → delegate → aggregate across specialized agents), and Control Plane (route → authorize → observe through gateways and IdP-provisioned access).
That framing rides the July 2026-07-28 MCP spec — a stateless request/response core, header-based routing, cacheable tool catalogs, hardened OAuth/OIDC auth, and official extensions such as Tasks and Enterprise-Managed Authorization. Anthropic is rolling the same spec into Claude products, with 950+ connectors in directory and enterprise-managed auth so admins provision once via Entra or Okta.