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7/2/2026
The MCP Release Candidate Survival Guide: Apps, Auth, Deprecations, and Tool Schemas

The MCP Release Candidate Survival Guide: Apps, Auth, Deprecations, and Tool Schemas

Short summary

MCP's July 2026 release makes the protocol stateless, removing session-dependent patterns and requiring state to be explicit and portable across server instances. Major changes include stateless request headers, stateful interactions through InputRequiredResult/retry patterns, sandbox-aware MCP Apps, OAuth 2.0 issuer validation, and full JSON Schema 2020-12 support. Roots, Sampling, and Logging are deprecated in favor of tool parameters, direct API integration, and OpenTelemetry.

  • •Protocol becomes stateless with explicit request headers (MCP-Protocol-Version, Mcp-Method) instead of connection-based session state
  • •Stateful interactions use InputRequiredResult and request retry patterns to enable confirmation dialogs and multi-step workflows across server instances
  • •Deprecated Roots/Sampling/Logging should migrate to tool parameters, direct provider APIs, and OpenTelemetry for observability

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