Lucairn MCP

An MCP server that pseudonymizes PII in prompts before they reach the LLM and returns a cryptographically signed receipt. It integrates with Claude Desktop via stdio, scanning text messages for sensitive data like names and emails, replacing them with placeholders, and restoring original values in responses by default.

Package and access

Local package with source-attributed installation metadata. Koskamo does not execute packages during review.

Community listingLocal stdioSource reviewed; not executedPublished by Lucairn

You need:You need your Lucairn API key plus at least one upstream BYOK keysign up at /account/signup

Vendor documentation

What you can do with it

Scan prompts for PII before LLM processing
Generate cryptographic privacy certificates
Integrate privacy pipeline with Claude Desktop

Source and maintenance

Community listingRegistry 1.2.9

mcp-registry: io.github.Declade/lucairn-mcp-server@1.2.9 Source repository Project website

Maintenance checked: Oct 31, 2026, 10:59 PM UTC

Packages and installation

Source-provided package data. Koskamo has not executed or live-probed this package.

@lucairn/mcp-server 1.2.9

npm

@lucairn/mcp-server package definition

{
  "version": "1.2.9",
  "transport": "stdio",
  "identifier": "@lucairn/mcp-server",
  "registryType": "npm",
  "environmentVariables": [
    {
      "name": "LUCAIRN_API_KEY",
      "format": "string",
      "isRequired": true,
      "description": "Lucairn gateway API key (lcr_live_*). Issued at https://lucairn.eu/account/keys. Free tier requires BYOK upstream LLM keys (ANTHROPIC_API_KEY or OPENAI_API_KEY)."
    },
    {
      "name": "ANTHROPIC_API_KEY",
      "format": "string",
      "description": "Upstream Anthropic API key. Used when the requested model is claude-* / anthropic-*. Required if you call Claude models on the free tier (BYOK)."
    },
    {
      "name": "OPENAI_API_KEY",
      "format": "string",
      "description": "Upstream OpenAI API key. Used when the requested model routes to OpenAI. Required if you call OpenAI models on the free tier (BYOK)."
    },
    {
      "name": "LUCAIRN_BASE_URL",
      "format": "string",
      "description": "Override the gateway URL. Defaults to https://gateway.lucairn.eu (production). Set this to point at a self-hosted Lucairn deployment."
    },
    {
      "name": "LUCAIRN_TRANSPORT",
      "format": "string",
      "description": "Transport mode for the MCP server. One of 'direct-http' (default; v1.1+ behavior) or 'stdio-bridge' (v1.2+ opt-in)."
    }
  ]
}

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

Connect from your client

Each snippet configures the same source-provided package; replace placeholders before use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Cursor

Merge this local stdio configuration, replace every placeholder environment value, and restart Cursor. Koskamo has not executed this package.

Cursor configuration

{
  "mcpServers": {
    "lucairn-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server@1.2.9"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<YOUR_LUCAIRN_API_KEY>",
        "ANTHROPIC_API_KEY": "<YOUR_ANTHROPIC_API_KEY>",
        "OPENAI_API_KEY": "<YOUR_OPENAI_API_KEY>",
        "LUCAIRN_BASE_URL": "<YOUR_LUCAIRN_BASE_URL>",
        "LUCAIRN_TRANSPORT": "<YOUR_LUCAIRN_TRANSPORT>"
      }
    }
  }
}

Cline

Merge this local stdio configuration, replace every placeholder environment value, and restart Cline. Koskamo has not executed this package.

Cline configuration

{
  "mcpServers": {
    "lucairn-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server@1.2.9"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<YOUR_LUCAIRN_API_KEY>",
        "ANTHROPIC_API_KEY": "<YOUR_ANTHROPIC_API_KEY>",
        "OPENAI_API_KEY": "<YOUR_OPENAI_API_KEY>",
        "LUCAIRN_BASE_URL": "<YOUR_LUCAIRN_BASE_URL>",
        "LUCAIRN_TRANSPORT": "<YOUR_LUCAIRN_TRANSPORT>"
      }
    }
  }
}

VS Code

Merge this local stdio configuration, replace every placeholder environment value, and restart VS Code. Koskamo has not executed this package.

VS Code configuration

{
  "servers": {
    "lucairn-mcp": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server@1.2.9"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<YOUR_LUCAIRN_API_KEY>",
        "ANTHROPIC_API_KEY": "<YOUR_ANTHROPIC_API_KEY>",
        "OPENAI_API_KEY": "<YOUR_OPENAI_API_KEY>",
        "LUCAIRN_BASE_URL": "<YOUR_LUCAIRN_BASE_URL>",
        "LUCAIRN_TRANSPORT": "<YOUR_LUCAIRN_TRANSPORT>"
      }
    }
  }
}

Claude Desktop

Merge this local stdio configuration, replace every placeholder environment value, and restart Claude Desktop. Koskamo has not executed this package.

Claude Desktop configuration

{
  "mcpServers": {
    "lucairn-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server@1.2.9"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<YOUR_LUCAIRN_API_KEY>",
        "ANTHROPIC_API_KEY": "<YOUR_ANTHROPIC_API_KEY>",
        "OPENAI_API_KEY": "<YOUR_OPENAI_API_KEY>",
        "LUCAIRN_BASE_URL": "<YOUR_LUCAIRN_BASE_URL>",
        "LUCAIRN_TRANSPORT": "<YOUR_LUCAIRN_TRANSPORT>"
      }
    }
  }
}

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