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Model Context Protocol 2026-07-28 interoperability profile

Machine-readable implementation facts for the current stateless MCP core, JSON-RPC messages, standard transports, and JSON Schema validation requirements.

version 1.0.0freshness currentobserved 2026-08-26T15:00:00Z

resource.interop.mcp-2026-07-28
sha256:c71ba1f894f29fd8b78d4bdaeff80e0c7c24b073bf71d0d1929a5f06e826e98a

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Evidence-backed facts

  1. The current referenced Model Context Protocol revision is 2026-07-28. informative
  2. All messages between MCP clients and servers must follow JSON-RPC 2.0. normative
  3. The 2026-07-28 MCP core is stateless: every request carries the information needed for independent processing, and a server must not infer context from prior requests on the same connection. normative
  4. The standard MCP bindings are stdio and Streamable HTTP; Streamable HTTP sends each message by HTTP POST to one MCP endpoint and returns JSON or a request-scoped SSE stream. informative
  5. MCP clients and servers must support JSON Schema 2020-12 for schemas without an explicit $schema field and validate schemas using the declared or default dialect. normative