PromptZero — Transparent Claude API proxy that anonymizes PII before it leaves your environment

PromptZero is a local proxy that detects and replaces sensitive data (IPs, hostnames, emails, credentials, names, national IDs, etc.) in prompts sent to Claude API, then restores real values in responses. It uses NLP (spaCy/Presidio) and regex patterns, substitutes with IANA-reserved ranges (RFC 5737/3849/2606), maintains session mapping tables, and supports pentest mode to disable name/organization detection. Runs via Docker or native install, works as a drop-in replacement for api.anthropic.com, and can route Claude Code CLI through it. Includes demo datasets, document summarization, and pentest report generator examples. From pentesters to pentesters. MIT license. 

https://github.com/openbashok/promptzero

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