How do I install Redacta?

Redacta is a local plugin. Install it using npm package: redacta-mcp and add the generated configuration snippet to your AI app's MCP config file. Then restart your AI app.

What AI apps work with Redacta?

Redacta uses the Model Context Protocol (MCP) and works with any MCP-compatible AI app, including Claude, ChatGPT / Codex, Gemini, Copilot, Cursor, and more.

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Redacta MCP Server

by Nickjlamb

Developer ToolsModerate5.2MCP RegistryLocal

Free

Server data from the Official MCP Registry

Pseudonymise and restore patient identifiers & PII in text — local, HIPAA Safe Harbor mode.

About

Pseudonymise and restore patient identifiers & PII in text — local, HIPAA Safe Harbor mode.

Security Report

5.2

Moderate5.2Moderate Risk

Redacta is a well-designed, security-conscious redaction engine with clean architecture and appropriate authentication handling. The code demonstrates strong input validation, proper use of checksums and keyword anchoring to prevent false positives, and maintains safe patterns for handling sensitive token maps. No network access, no credential storage, no dangerous operations detected. Minor code quality observations noted but do not substantiate security concerns. Supply chain analysis found 3 known vulnerabilities in dependencies (0 critical, 3 high severity). Package verification found 1 issue.

6 files analyzed · 7 issues found

Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.

Permissions Required

This plugin requests these system permissions. Most are normal for its category.

File System Read

Reads files on your machine. Normal for tools that analyze or process local data.

File System Write

Writes or modifies files on your machine. Check that this is expected for the tool.

env_vars

Check that this permission is expected for this type of plugin.

How to Install

Add this to your MCP configuration file:

{
  "mcpServers": {
    "io-github-nickjlamb-redacta-mcp": {
      "args": [
        "-y",
        "redacta-mcp"
      ],
      "command": "npx"
    }
  }
}

Documentation

View on GitHub

From the project's GitHub README.

Redacta

Pseudonymise medical and clinical documents before they're processed by AI or shared. Redacta replaces patient identifiers with labelled tokens — [PATIENT_NAME_1], [NHS_NUMBER_1], [DATE_OF_BIRTH_1], … — while leaving the clinical meaning intact, and returns a redaction report alongside the cleaned text.

It's an Agent Skill (the open standard used by Claude and other agents), so it drops into Claude Code, the Claude apps, or the API.

How it works

Two layers:

Patterns (deterministic). A bundled script (scripts/redact_structured.py, Python standard library only, no network) matches fixed-format identifiers: NHS numbers (Modulus-11 validated), UK National Insurance numbers, dates of birth, UK postcodes, phone numbers, emails, and hospital/MRN numbers. US SSN and ZIP codes are also handled.
Reasoning (judgement). The skill then has the agent handle what patterns can't: patient names (told apart from the clinicians treating them), relatives and carers, postal addresses, and identifying ages.
Self-check. A final pass re-reads the output for any identifier that slipped through before the report is written.

It also works in reverse. Re-identification (scripts/reinstate.py) takes the token map from an earlier redaction and restores the original values — so you can redact a document, run it through another AI tool, and put the real details back locally. Redact → process → re-identify is a complete round trip, and identifiers only ever exist on your machine.

Safe Harbor mode. Ask for HIPAA Safe Harbor (or "US de-identification") and Redacta applies a stricter pass: all dates (not just the date of birth), all specific ages, and the remaining HIPAA identifiers — fax, certificate/licence, device serial, VIN, and health-plan beneficiary numbers.

Install

Claude Code

git clone https://github.com/nickjlamb/redacta ~/.claude/skills/redacta

Then invoke it with /redacta, or let it trigger automatically when you ask to redact or de-identify clinical text.

Claude apps / API

Zip the repository folder and upload it as a skill.

Path	What it is
`SKILL.md`	The skill — instructions plus metadata
`reference.md`	Pattern specs, the Modulus-11 algorithm, NI prefix rules, the date-of-birth vs clinical-date rule, token vocabulary, limitations
`scripts/redact_structured.py`	The deterministic pattern layer
`scripts/reinstate.py`	The re-identification layer (restore originals from a token map)
`scripts/test_redact_structured.py`	Tests for the pattern layer
`scripts/test_reinstate.py`	Tests for the re-identification layer
`evaluations.json`	Example evaluation scenarios

Run the tests:

python3 scripts/test_redact_structured.py
python3 scripts/test_reinstate.py

A note on limits

Redacta is a strong first line of defence, not a guarantee. It won't catch every possible identifier and isn't a substitute for formal data-protection processes. Always review the redaction report before sharing text.

License

MIT-0 (MIT No Attribution). Built by PharmaTools.AI.

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Redacta MCP Server

About

Security Report

Findings (7)Action required

Permissions Required

How to Install

Documentation

Redacta

How it works

Install

Contents

A note on limits

License

Reviews

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