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Version: 0.56.5

MCP-001: Invalid JSON-RPC Version - MCP

Summary​

  • Rule ID: MCP-001
  • Severity: HIGH
  • Category: MCP
  • Normative Level: MUST
  • Auto-Fix: Yes (safe)
  • 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​

{
  "jsonrpc": "1.0",
  "method": "tools/list",
  "id": 1
}

Valid​

{
  "jsonrpc": "2.0",
  "method": "tools/list",
  "id": 1
}