Lucairn MCP Server

by decladeio.github.Declade/lucairn-mcp-serverv1.2.9

Privacy gateway that sanitizes German and English PII before prompts reach an LLM and issues a signed, timestamped certificate for each call.

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Active2d ago

Install Lucairn MCP server

claude mcp add lucairn -e LUCAIRN_API_KEY='<lucairn-api-key>' -e ANTHROPIC_API_KEY='<anthropic-api-key>' -e OPENAI_API_KEY='<openai-api-key>' -- npx -y @lucairn/mcp-server

{
  "mcpServers": {
    "lucairn": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<lucairn-api-key>",
        "ANTHROPIC_API_KEY": "<anthropic-api-key>",
        "OPENAI_API_KEY": "<openai-api-key>"
      }
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (project).

{
  "mcpServers": {
    "lucairn": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<lucairn-api-key>",
        "ANTHROPIC_API_KEY": "<anthropic-api-key>",
        "OPENAI_API_KEY": "<openai-api-key>"
      }
    }
  }
}

Settings → Developer → Edit Config (claude_desktop_config.json), then restart.

{
  "servers": {
    "lucairn": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<lucairn-api-key>",
        "ANTHROPIC_API_KEY": "<anthropic-api-key>",
        "OPENAI_API_KEY": "<openai-api-key>"
      }
    }
  }
}

Add to .vscode/mcp.json in your workspace.

{
  "mcpServers": {
    "lucairn": {
      "command": "npx",
      "args": [
        "-y",
        "@lucairn/mcp-server"
      ],
      "env": {
        "LUCAIRN_API_KEY": "<lucairn-api-key>",
        "ANTHROPIC_API_KEY": "<anthropic-api-key>",
        "OPENAI_API_KEY": "<openai-api-key>"
      }
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

Configuration

Variable	Required	Secret	Description
LUCAIRN_API_KEY	yes	yes	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).
ANTHROPIC_API_KEY	—	yes	Upstream Anthropic API key. Used when the requested model is claude-* / anthropic-*. Required if you call Claude models on the free tier (BYOK).
OPENAI_API_KEY	—	yes	Upstream OpenAI API key. Used when the requested model routes to OpenAI. Required if you call OpenAI models on the free tier (BYOK).
LUCAIRN_BASE_URL	—	—	Override the gateway URL. Defaults to https://gateway.lucairn.eu (production). Set this to point at a self-hosted Lucairn deployment.
LUCAIRN_TRANSPORT	—	—	Transport mode for the MCP server. One of 'direct-http' (default; v1.1+ behavior) or 'stdio-bridge' (v1.2+ opt-in).

Freshness

Active — last maintenance signal 2d ago. The newest of the signals below sets the band.

Last commit (default branch)
2026-10-08 · 2d ago · GitHub
Latest release
2026-10-08 · 2d ago · GitHub · bundle-verify-v1.2.0
Package published
no data · npm/PyPI
Registry entry updated
2026-07-31 · 2mo ago · official registry · v1.2.9

FAQ

›How do I install the Lucairn MCP server in Claude Code?

Run: claude mcp add lucairn -e LUCAIRN_API_KEY='<lucairn-api-key>' -e ANTHROPIC_API_KEY='<anthropic-api-key>' -e OPENAI_API_KEY='<openai-api-key>' -- npx -y @lucairn/mcp-server. For Cursor, VS Code, Claude Desktop and Windsurf, use the install tabs above.

›Does Lucairn require an API key?

Yes. It expects LUCAIRN_API_KEY, ANTHROPIC_API_KEY, OPENAI_API_KEY, of which 3 are secrets.

›Can I use Lucairn as a remote (hosted) MCP server?

No hosted endpoint is published; it runs locally over stdio.

›Is Lucairn in the official MCP registry?

Yes, as io.github.Declade/lucairn-mcp-server.