php-mcp-sdk

The SDK demonstrates a strong focus on security, employing robust input validation using `InvalidArgumentException` and `JsonSchemaValidator`, structured error handling (`McpError`), and network security features in its transport layers (`allowedHosts`, `allowedOrigins`, `enableDnsRebindingProtection` for HTTP/WebSocket). The OAuth implementation includes client authentication, token verification, PKCE support (configurable for proxy scenarios), and metadata endpoints, showing a good understanding of OAuth best practices. While complex OAuth flows always carry inherent configuration risks, the SDK provides the necessary primitives to implement them securely. No `eval()` or direct code injection vulnerabilities were found. URI validation for `Root` objects also adds a layer of safety.