The MCP protocol, after twenty months and five revisions, has undergone significant changes, notably the removal of session capabilities in July 2026. This revision aligns MCP with Fielding's REST constraints by making it stateless, a correction that arrived late but is deemed necessary for compatibility with standard infrastructure. The protocol now includes features like response cache hints and routing information in headers, enabling proxies to direct requests without body parsing. While the changes were implemented as a Release Candidate with a year of grace for deprecated features, they necessitate budget allocation for rewriting. AI
RANK_REASON Analysis of a protocol's revision history and technical implications. [lever_c_demoted from research: ic=1 ai=0.1]
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