Full breakdown: Claude-only apps often wait until the host speaks the new revisi

The July 28 revision of the Model Context Protocol (MCP), which connects AI applications to tools, puts protocol metadata in each message. Every request carries its protocol version and client capabilities, whereas earlier revisions established a connection-scoped session through an initialize handshake. Because each request describes itself, it no longer depends on a prior handshake on the same connection. Official transport specification

Application behavior still needs care when a tool changes something. The cancellation specification notes that a cancellation may arrive after processing has completed, even after a response was sent, and both sides must handle that race gracefully. A cancelled or abandoned request therefore cannot be assumed to have done nothing.