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MCP 2025-06-18 Spec Update: Security, Structured Output & Elicitation

  • MCP 2025-06-18 Spec Update enhances security with OAuth 2.0 Resource Server classification.
  • Structured JSON tool output supported, along with elicitation for user input mid-session.
  • New Security Considerations, PKCE protection, and token audience validation for MCP servers.
  • Added Security Best Practices with concrete countermeasures and structured output schema support.
  • Resource links in tool results, protocol version enforcement, and JSON-RPC batching removed.

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