capability:mcp-protocol-version-header

{
  "id": "capability:mcp-protocol-version-header",
  "_kind": "Capability",
  "_file": "capabilities/capabilities/mcp-protocol-version-header.yaml",
  "_cluster": "capabilities",
  "attributes": {
    "displayName": "MCP-Protocol-Version header",
    "description": "The entity sends/honors the mandatory `MCP-Protocol-Version` HTTP\nheader on Streamable HTTP transports, recording the negotiated\nprotocol version on every subsequent request. Required by MCP spec\nrevision 2025-06-18.\nSee https://modelcontextprotocol.io/specification/2025-06-18/basic/transports\n",
    "appliesToNodeKinds": [
      "AgentRuntimeImpl",
      "ToolServer"
    ],
    "category": "agent"
  },
  "outgoingEdges": [],
  "incomingEdges": [
    {
      "from": "agent-runtime-impl:claude-code.runtime@1.x",
      "to": "capability:mcp-protocol-version-header",
      "kind": "supports",
      "attributes": {
        "versionRange": ">=1.0.0 <2.0.0",
        "level": "full",
        "notes": "Claude Code sends the `MCP-Protocol-Version` header on Streamable HTTP requests as required by MCP spec 2025-06-18+. ",
        "evidenceSourceIds": [
          "evidence:claude-code-docs-mcp-2026"
        ]
      }
    }
  ]
}