LABSCO SUMMARY

One tool, and the whole of its value sits between your call and the model's reply.

chat_via_lucairn is an ordinary chat call whose point is the substitution step in the middle: PII is detected and replaced with placeholders before the upstream provider ever sees the text, and the provider keys stay in your own configuration rather than in the gateway. Provider selection is derived rather than declared — the model string decides whether ANTHROPIC_API_KEY or OPENAI_API_KEY is used — so moving a workload between Anthropic and OpenAI is a parameter change. With one tool and the Anthropic Messages shape on the wire, the cost of finding out whether the redaction suits your data is a single call.

What it is

A single-tool privacy gateway for chat: chat_via_lucairn detects PII and replaces it with placeholders before the request reaches the upstream model, and routes to Anthropic or OpenAI according to the model name, with bring-your-own keys on both sides.

What you get

PII removed ahead of the upstream call: chat_via_lucairn detects personally identifiable information and substitutes placeholders before the text leaves for the provider.
The provider chosen by the model string rather than by configuration: claude-* and anthropic-* models go upstream on ANTHROPIC_API_KEY, while gpt-*, openai-*, o1-*, o3-* and o4-* go upstream on OPENAI_API_KEY.
The ordinary chat controls preserved: messages, system, model, temperature and max_tokens pass through, in the Anthropic Messages wire format.

Requirements

A Lucairn API key as LUCAIRN_API_KEY, plus the upstream provider keys you intend to use: ANTHROPIC_API_KEY for the claude-* models and OPENAI_API_KEY for the gpt-* ones.

Setup effort

One command plus a key — npx -y @lucairn/mcp-server, then supply credentials

See installation options

USE CASES

01

Sending a customer record to a model without sending the customer

Put the chat request through the gateway so identifying details are replaced with placeholders before the upstream provider sees any of it.

chat_via_lucairn

02

Moving a workload between providers on your own keys

Change the model string and the gateway routes to the matching provider, using the key you supplied for it rather than one of theirs.

chat_via_lucairn

1 tool

Counted once with only startup setup. Other versions, modes or optional credentials may expose a different list.

`chat_via_lucairn`

Send a chat request through the Lucairn privacy gateway with cross-provider BYOK (Anthropic + OpenAI). PII is detected and replaced with placeholders before reaching the upstream LLM. The gateway picks the upstream provider based on the model parameter: claude-* / anthropic-* use ANTHROPIC_API_KEY; gpt-* / openai-* / o1-* / o3-* / o4-* use OPENAI_API_KEY. Wire format follows the Anthropic Messages API. Developer-tier responses contain raw placeholders; Pro and Enterprise tiers can enable automatic re-linking back to the original values.

BEFORE YOU INSTALL

What to know first

Tools you get

1 tool when we connected. On the free Developer tier, placeholders like [PERSON_1] come back unreplaced; Pro and Enterprise restore real values. The GPU-hosted detection layer is Enterprise only.

Requires

npx on PATH
LUCAIRN_API_KEY in your environment

Optional

ANTHROPIC_API_KEY in your environment
OPENAI_API_KEY in your environment

Where it runs

All 3 documented clients run the server on your machine.

CONTEXT COST

Light Standing cost

Rated by the size of the one tool definition that rides along on every turn

INSTALLATION

Connect your client

Server setup

TERMINAL

npx -y @lucairn/mcp-server

MCP Clients

Claude Desktop, Cursor, Cline

JSON

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

Lucairn Privacy Gateway