Pseudonym MCP

Local pseudonymisation tools for LLM workflows - replace detected PII with opaque tokens before you hand text to a cloud LLM, then restore those tokens afterward.

People who work with gdpr and privacy and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in TypeScript.

VERIFIED ACTIVE

LAST COMMIT 2026-09-04 · ★ 2 · #271 OF 945 MAINTAINED OTHER · VERIFIED 2026-09-18

MIT · TypeScript servers · how we verify → /methodology

01 · Install Pseudonym MCP

Claude Code

claude mcp add woladi-pseudonym-mcp -- npx -y pseudonym-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "woladi-pseudonym-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "pseudonym-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license MIT - declared in the repository

npm package pseudonym-mcp - unscoped; check the name against the project README before installing

registry namespace io.github.woladi is GitHub-verified and matches the repo owner

03 · What Pseudonym MCP can do

Prose above is summarized from the project's README and registry record - no invented capabilities.

What you can build

An agent gets 2 documented tools across mask, unmask, including mask_text, unmask_text.

The 2 tools it gives your agent

Extracted from the project's README - what pseudonym-mcp lets an agent do.

mask_text
- Pseudonymise detected PII in text. Returns masked_text + session_id.
unmask_text
- Restore original values from a session. Pass the session_id returned by mask_text.

Limitations (from the README)

pseudonym-mcp is a technical privacy control, not a legal guarantee of compliance. - Detection is best-effort. False negatives and false positives are both possible. Indirect references (e.g. _"the tall guy from accounting"_, _"my landlord"_, _"the place near the bridge"_) are not detected. Nicknames, initials, and partial names are typically missed. - Structure still travels. Amounts, relationships between tokens, n

Latest releases

v0.9.0 · 2026-08-25

Recognize every locale pack by default, and make mcp-config.json reachable. · A server started without --lang recognized the English pack only. A Polish · document went through with its PESEL, NIP and phone number…

v0.8.2 · 2026-08-25

adds three illustrations to the README - the mask/restore flow, · the recognizer coverage across Poland, the EU and the US, and how a match's · confidence is scored against the sensitivity thresholds.

v0.8.1 · 2026-08-25

the contributor guide described the pre-0.8 rule API · (pattern, engines, toPatternDef), the pipeline diagram still listed the · original five entity types, and the limitations section said dates always reach · the…

04 · Who maintains Pseudonym MCP

pseudonym-mcp is maintained by woladi. We track 2 MCP servers from woladi - 2 actively maintained, 8 combined GitHub stars, oldest repo from Apr 2026. Full record: all servers from woladi.

  1. macos-vision-mcp Local OCR & screen understanding for agents: read any window, find what to click. No uploads. ★ 6

05 · Facts

repository
github.com/woladi/pseudonym-mcp
category
other - ranked #271 of 945 actively-maintained other servers as of 2026-09-18.
release cadence
5 releases in the last 90 days (latest 2026-08-25)
registry
io.github.woladi/pseudonym-mcp (active, first published 2026-04-12 · 6 versions)
packages
npm:pseudonym-mcp

06 · Pseudonym MCP FAQ

What is Pseudonym MCP?

Local pseudonymisation tools for LLM workflows - replace detected PII with opaque tokens before you hand text to a cloud LLM, then restore those tokens afterward.

Is Pseudonym MCP still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-04 and it shipped 5 releases in the last 90 days. We re-verify nightly.

How do I install Pseudonym MCP?

Run `npx -y pseudonym-mcp`. You can also paste the ready-made client config above.

Does Pseudonym MCP run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

07 · Alternatives to Pseudonym MCP

Alternatives to Pseudonym MCP

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  6. Microsoft Fabric MCP Server MCP tools for interacting with Microsoft Fabric ★ 3,681 · 2026-09-17

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