MCP-011: Invalid MCP server type - MCP

Summary

• Rule ID: MCP-011
• Severity: HIGH
• Category: MCP
• Normative Level: MUST
• Auto-Fix: Yes (unsafe)
• Verified On: 2026-02-07

Applicability

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

Evidence Sources

• https://modelcontextprotocol.io/specification

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": {
    "my-server": {
      "type": "websocket",
      "url": "ws://localhost:8080"
    }
  }
}

Valid

{
  "mcpServers": {
    "my-server": {
      "type": "stdio",
      "command": "node"
    }
  }
}