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Version: 0.11.0

MCP-012: Deprecated SSE transport - MCP

Summary​

  • Rule ID: MCP-012
  • Severity: MEDIUM
  • Category: MCP
  • Normative Level: SHOULD
  • Auto-Fix: Yes (unsafe)
  • Verified On: 2026-02-07

Applicability​

  • Tool: all
  • Version Range: unspecified
  • Spec Revision: 2025-03-26

Evidence Sources​

Test Coverage Metadata​

  • Unit tests: true
  • Fixture tests: true
  • E2E tests: false

Examples​

The following examples demonstrate what triggers this rule and how to fix it.

Invalid​

{
  "mcpServers": {
    "remote-api": {
      "type": "sse",
      "url": "http://localhost:3000/sse"
    }
  }
}

Valid​

{
  "mcpServers": {
    "remote-api": {
      "type": "http",
      "url": "http://localhost:3000/mcp"
    }
  }
}