open-mcp-guardrailsGuardrails Proxy for MCP Servers

Just prepend to your existing MCP server command to protect your app from PII leaks, secret exposure, and prompt injection

PII & Secret Protection

Automatically detect and block sensitive information like email addresses, phone numbers, API keys, and tokens from leaking between tools

Control dangerous tool call patterns like web fetch → email send, preventing unintended data exfiltration

Just call defineConfig() to enable PII + secret protection by default. Customize rules as needed