Session IDs Are Going Away. Here's What Breaks & What You Can Finally Build
Blog post from Arcade
The new Model Context Protocol (MCP) release transitions from a stateful to a stateless model, eliminating session IDs and simplifying multi-user session management, which previously required complex session stores or sticky sessions. This change allows any server replica to handle any request, as clients now send all necessary information with each request, aligning with the stateless nature of REST APIs. While this simplifies the execution of simple tool calls by removing initialization steps, it necessitates adjustments in server logic for long-running tasks, as clients must now poll the server for updates instead of receiving automatic notifications. Arcade.dev's runtime supports both the old and new protocol versions, allowing for a gradual transition, and ensures consistent authorization and governance as new extensions are introduced. This shift to a stateless protocol aims to enhance scalability and ease of use, positioning MCP alongside the widely adopted REST standard.
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