Expired60% confidenceFactExact time
The MCP 2.0 specification recommends using OAuth 2.1 rather than 2.0, because version 2.1 mandates security enhancements such as PKCE, effectively preventing authorization code interception attacks.
2
Sources
60%
Confidence
Medium-term (~90 days)
Relevance
7/2/2026
First Seen
Valid until: 9/30/2026(expired)
Sources
MCP Protocol Explained: The Unified Standard for AI Agent-Tool Communication
bilibili大模型小阳6/8/2026
Related Claims
UnverifiedThe authentication scheme recommended by the official MCP specification is OAuth 2.1 with PKCE.77% similarUnverifiedThe MCP server has been updated to version 2.0, introducing the Mcp-Session-Id header to identify client sessions and adopting OAuth 2.1 as the recommended authentication framework.74% similarVerifiedMCP's permission model draws on the OAuth 2.0 authorization code flow, requiring explicit user authorization for tool invocation.71% similarUnverifiedBedrock, Vertex, Foundry, and installations with telemetry disabled now use the v2 MCP client and MCP 2026-07-28 negotiation mechanism by default.70% similarUnverifiedAC2 is positioned as a security supplementary layer for protocols such as MCP rather than a replacement, used to fill the gaps in existing agent protocols in the dimension of security governance.70% similar
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