Freestyle Libre MCP Server

freestyle-libre-mcp

An MCP server that gives Claude (or any MCP client) read-only access to FreeStyle Libre CGM glucose readings shared through LibreLinkUp. It talks to the LibreLinkUp API with its own small async client (librelinkup_mcp.core); the API behaviour it relies on follows pylibrelinkup.

Tools

Every reading tool takes an optional patient: a name ("Ann Lee", "ann") or a patient_id from list_patients. It can be omitted when the account follows one person.

Readings include value in the account's unit, value_mg_dl, unit, timestamp (the sensor's local time), timestamp_utc, and is_high/is_low flags. The current reading also has age_minutes, since LibreLinkUp returns the last known value when the sensor or phone is out of range.

Setup

For a step-by-step guide, including account setup and troubleshooting, see the installation guide. Full documentation is at https://freestyle-libre-mcp.readthedocs.io.

You need a LibreLinkUp follower account: invite it from the LibreLink app, accept the invite in the LibreLinkUp app, and accept any terms there before using this server.

git clone https://github.com/osjayaprakash/freestyle-libre-mcp.git && cd freestyle-libre-mcp
uv sync

If the region is wrong, the first tool call tells you which one to set.

Run from PyPI

No clone needed; uv fetches and runs the published package:

uvx freestyle-libre-mcp

In a client config, use "command": "uvx", "args": ["freestyle-libre-mcp"].

Run with Docker

The server speaks MCP over stdio, so keep -i:

docker run -i --rm \
  -e LIBRELINKUP_EMAIL -e LIBRELINKUP_PASSWORD -e LIBRELINKUP_REGION \
  ghcr.io/osjayaprakash/freestyle-libre-mcp:latest

In a client config, use "command": "docker" with those arguments, and pass the variables through the client's env block.

Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "librelinkup": {
      "command": "uv",
      "args": ["--directory", "/absolute/path/to/freestyle-libre-mcp", "run", "freestyle-libre-mcp"],
      "env": {
        "LIBRELINKUP_EMAIL": "you@example.com",
        "LIBRELINKUP_PASSWORD": "your-password",
        "LIBRELINKUP_REGION": "US"
      }
    }
  }
}

Claude Code

claude mcp add librelinkup \
  -e LIBRELINKUP_EMAIL=you@example.com \
  -e LIBRELINKUP_PASSWORD=your-password \
  -e LIBRELINKUP_REGION=US \
  -- uv --directory /absolute/path/to/freestyle-libre-mcp run freestyle-libre-mcp

Langfuse tracing (optional)

Each tool call becomes a Langfuse trace, with a child span for the LibreLinkUp API call. Install the extra and set the keys:

uv sync --extra langfuse

In the server command, use run --extra langfuse freestyle-libre-mcp instead of run freestyle-libre-mcp.

Privacy: glucose readings and patient names are health data. By default, traces hold only tool names, timings, patient UUIDs, and error class names. Setting LANGFUSE_CAPTURE_DATA=true sends readings and names to your Langfuse instance; only do that with an instance you trust, such as a self-hosted one.

Development

uv sync
uv run pytest            # offline suite
uv run pytest -m live    # hits the real API; needs LIBRELINKUP_EMAIL/PASSWORD
uv run ruff check src tests && uv run ruff format --check src tests

License

MIT