MCP Servers Validator

The MCP validator checks .mcp.json configuration files for transport types, URLs, environment variables, and server configuration.

What It Checks

• Transport type validity (stdio, SSE, HTTP, WebSocket)
• URL format validation per transport type
• Environment variable syntax
• Variable expansion patterns
• Command validation for stdio transport

Rules

This validator includes 11 rules. See the MCP rules category for the complete list.

Rule	Severity	Description
mcp-invalid-transport	error	Unknown transport type
mcp-stdio-empty-command	error	Stdio transport command is empty
mcp-http-invalid-url	error	Invalid HTTP URL
mcp-invalid-env-var	warn	Invalid environment variable

CLI Usage

claudelint validate-mcp
claudelint validate-mcp --verbose

See Also

• Claude Code MCP Servers - Official MCP documentation
• Configuration - Customize rule severity