MCP Protocol Drops Session Handshakes, Mandates OAuth 2.1 in July 2025 Update

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The Model Context Protocol (MCP), Anthropic's open standard for connecting AI apps to external tools, is set to finalize a major specification update on 28 July 2025. The update removes the initialize handshake and Mcp-Session-Id header, making MCP stateless and allowing requests to route across any server instance behind a load balancer. The experimental Tasks API is being replaced by a Tasks extension with new method names, while Roots, Sampling, and Logging are deprecated with a 12-month migration window. OAuth 2.1 becomes mandatory under the new spec, and SDK updates include Python renaming FastMCP to MCPServer and TypeScript moving to ESM-only. Developers are advised to audit their existing MCP servers for session-related assumptions and migrate away from deprecated features before the deadline.

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