The Developer's Dilemma
You're debugging a production issue. The stack trace includes customer email addresses. The fastest solution? Paste it into Claude and ask for help.
But that customer data is now:
- Stored in Anthropic's systems
- Potentially used for training (depending on your plan)
- Visible to anyone with access to your chat history
77% of developers paste sensitive data into AI tools. Most don't realize the implications until it's too late.
The MCP Server Solution
The Model Context Protocol (MCP) Server acts as a transparent proxy between you and AI assistants. It:
- Intercepts your prompts before they reach the AI
- Detects and anonymizes PII automatically
- Sends only anonymized data to the AI
- De-anonymizes responses so you see original context
You interact with AI normally—the protection is invisible.
Setting Up MCP Server
Prerequisites
- Node.js 18+
- Claude Desktop, Cursor, or VS Code with Claude extension
- anonym.legal API key (get one free at anonym.legal/auth/signup)
Step 1: Get Your API Key
- Sign up at anonym.legal/auth/signup
- Navigate to Settings → API Tokens
- Generate a new token
- Copy the token (you'll only see it once)
Step 2: Configure Claude Desktop
Edit your Claude Desktop configuration file:
macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\Claude\claude_desktop_config.json
Linux: `~/.config/Claude/claude_...