MCP Shield PII Proxy

Example Use Cases

• 1

  Ensure GDPR/HIPAA compliance by redacting PII in real-time before data reaches LLMs.

• 2

  Integrate a privacy-preserving proxy between MCP clients and servers with customizable masking strategies.

• 3

  Audit trails, compliance reporting, and webhook alerts for sensitive data detection.

Description

mcp-shield-pii is an intercepting gateway proxy designed to sit between MCP clients and downstream MCP servers, masking sensitive PII data such as SSNs, credit cards, and medical records before it reaches large language models. It supports regex and NLP-based detection, multiple masking strategies, and compliance features like audit trails and GDPR/HIPAA reporting. The tool offers zero-latency privacy enforcement with optional acceleration via Python subinterpreters, making it suitable for enterprise-grade privacy protection.