Lucairn Privacy Gateway

Lucairn is an EU-based privacy gateway for AI APIs.

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What it can do

  • Chat Via Lucairn: Send an Anthropic Messages API request through the Lucairn privacy gateway. PII is detected and replaced with placeholders before reaching the upstream LLM. On the Developer (free) t

What data it sees

Do you need an account

No: the server works without sign-in

Lucairn is an EU-based privacy gateway for AI APIs.

Every request through this MCP server runs through a 3-layer PII pipeline before the upstream LLM (Claude, GPT-4o, o1/o3/o4) ever sees it:

Layer 1 — known-entity matching (your tenant's named entities) Layer 2 — Presidio NER (names, emails, IBANs, addresses, phone numbers, customer IDs, …) Layer 3 — GPU-hosted custom-trained PII shield (Enterprise tier, optionally trained on your domain corpus) Detected PII is replaced with placeholders ([PERSON_1], [EMAIL_2], [IBAN_3], …) before the request reaches the upstream model. The model never receives raw personal data. Every response carries a signed Lucairn certificate (Ed25519 witness signature + RFC 3161 timestamp + Sigstore Rekor inclusion proof) that proves what was redacted, when, and by which sanitizer layer.

Tiers:

Developer (free) — 500 requests/month, no credit card. Placeholders returned verbatim (useful for testing the redaction surface). Pro — placeholders are re-linked back to the originals on the gateway before the response reaches your application; programmatic certificate JSON access; audit-event export; higher quota. Enterprise — self-host the entire stack inside your environment (no raw identity data leaves it), BYOK with provider-side billing isolation, optional custom-trained PII shield priced per scope. One MCP tool exposed: chat_via_lucairn. Sign up at https://lucairn.eu.

How to connect

How to connect Lucairn Privacy Gateway to Claude

The server address to paste into Claude settings:

https://gatewayai--lucairneu.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect Lucairn Privacy Gateway to ChatGPT

The server address to paste into ChatGPT settings:

https://gatewayai--lucairneu.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect Lucairn Privacy Gateway to Cursor

The server address to paste into Cursor settings:

https://gatewayai--lucairneu.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (1)

Raw names from tools/list. Only developers need these.

chat_via_lucairnSend an Anthropic Messages API request through the Lucairn privacy gateway. PII is detected and replaced with placeholders before reaching the upstream LLM. On the Developer (free) tier responses contain those placeholders verbatim — upgrade to Pro or Enterprise to enable automatic re-linking.
Lucairn Privacy Gateway: connect to Claude, ChatGPT, Cursor · Connectors.fun