MCP-026: Reserved MCP Server Name - MCP

Summary

• Rule ID: MCP-026
• Severity: HIGH
• Category: MCP
• Normative Level: MUST
• Auto-Fix: No
• Verified On: 2026-05-06

Applicability

• Tool: claude-code
• Version Range: >=2.1.128
• Spec Revision: unspecified

Evidence Sources

• https://github.com/anthropics/claude-code/releases/tag/v2.1.128

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": {
    "workspace": {"type": "stdio", "command": "node"}
  }
}

Valid

{
  "mcpServers": {
    "fs": {"type": "stdio", "command": "node"}
  }
}