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Version: 0.12.1

MCP-002: Missing Required Tool Field - MCP

Summary​

  • Rule ID: MCP-002
  • Severity: HIGH
  • Category: MCP
  • Normative Level: MUST
  • Auto-Fix: No
  • Verified On: 2026-02-13

Applicability​

  • Tool: all
  • Version Range: unspecified
  • Spec Revision: 2025-11-25

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​

{
  "description": "Reads a file from disk",
  "inputSchema": { "type": "object" }
}

Valid​

{
  "name": "read-file",
  "title": "Read File",
  "description": "Reads a file from disk and returns its contents",
  "inputSchema": {
    "type": "object",
    "properties": {
      "path": { "type": "string" }
    },
    "required": ["path"]
  },
  "outputSchema": {
    "type": "object"
  },
  "icons": [{"src": "https://example.com/icon.png"}]
}