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MCP verified MIT Self-run

Masquerade

mcp-postralai-masquerade · by postralai

The Privacy Firewall for LLMs

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Install

$ agentstack add mcp-postralai-masquerade

✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.

Security review

✓ Passed

No issues found. Passed automated security review. · v0.1.0 How review works →

  • ✓ Prompt-injection patterns
  • ✓ Secret / credential exfiltration
  • ✓ Dangerous shell & filesystem operations
  • ✓ Untrusted network calls
  • ✓ Known-malicious package signatures

What it can access

  • ● Network access Used
  • ✓ Filesystem access No
  • ✓ Shell / process execution No
  • ✓ Environment & secrets No
  • ✓ Dynamic code execution No

From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.

View the full security report →

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Passed review? Show it. Paste this badge into your README, it links to the public security report.

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[![AgentStack Verified](https://agentstack.voostack.com/badges/verified.svg)](https://agentstack.voostack.com/security/report/mcp-postralai-masquerade)

Reliability & compatibility

✓ Security review passed
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Declared compatibility

Claude CodeClaude DesktopCursorWindsurf

Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.

Preview Execution monitoring

We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.

How agent discovery & health will work →
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About

Masquerade MCP: Redact. Replace. Retain Control.

[](https://github.com/user-attachments/assets/80b1d8ac-a012-41ce-8e92-64d567f2427f)

🤐 Problem: Tools like Claude or GPT are incredibly powerful, but they require raw input. If you're dealing with contracts, medical records, or internal documents, that's risky.

🛡️ Solution: Masquerade acts as a privacy firewall for your files. Just paste in the file path to a PDF, and Masquerade will:

  • Automatically detect sensitive data (names, emails, dates, entities)
  • Redact the sensitive data
  • Let you preview before sending to an LLM

Architecture

  1. User Input: The user asks Claude to redact a PDF by providing its file path.
  2. PDF Processing: MCP reads the PDF and converts it to text.
  3. Sensitive Data Detection: The text is sent to Tinfoil (an isolated AI platform using Llama 3.3 70B) to identify sensitive data.
  4. Redaction: MCP removes the sensitive data and creates a redacted PDF.
  5. Summary Return: MCP sends Claude a summary with:
  • Masked versions of the sensitive data
  • Redaction counts per page
  • The path to the redacted file
  1. Quering PDF with Claude: The user can upload the redacted PDF to Claude if satisfied with the redactions.

Installation

[](https://github.com/user-attachments/assets/76dedb64-1ef5-4ab4-afe1-11f399b3653b)

  1. Install Claude desktop
  2. Get Tinfoil API key (create account and API key)
  3. Configure environment

Option 1: Automated

curl -O https://raw.githubusercontent.com/postralai/masquerade/main/setup.sh && bash setup.sh
  1. Restart Claude desktop app (if successfully configured)

Option 2: Manual (click to expand)

  1. Create a virtual environment with **Python ">=3.10,

How to use?

  1. Prompt Claude: "Redact sensitive information from this PDF: /path/to/filename.pdf"
  2. MCP opens the redacted and highlighted PDF files
  3. Manually upload the redacted PDF to Claude for quering

Note: Don't upload the original PDF to Claude, only the file path.

Contributing

If you have a fix or improvement, feel free to submit a pull request. For significant changes, please open an issue first to discuss your proposed updates.

See the [Developer section](docs/developers.md) for the installation of this repository.

License

This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.

Need Help?

For questions and common issues, please see the [FAQ section](docs/faq.md) or open an issue on GitHub.

Source & license

This open-source MCP server is cataloged on AgentStack and links to its original source — we do not rehost the code.

Install and usage instructions live in the source repository linked above.

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Versions

  • v0.1.0 Imported from the upstream source.

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