FreeStyle Libre (LibreLinkUp)

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

Tool	Returns
list_patients	People the LibreLinkUp account follows
get_current_glucose	Latest reading with trend arrow
get_glucose_graph	Readings from about the last 12 hours, oldest first
get_glucose_logbook	Logged events from about the last 2 weeks, oldest first

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

Variable	Required	Default	Meaning
LIBRELINKUP_EMAIL	yes		Follower account email
LIBRELINKUP_PASSWORD	yes		Follower account password
LIBRELINKUP_REGION	no	US	One of US, EU, EU2, AE, AP, AU, CA, DE, FR, JP, LA, RU

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": "[email protected]",
        "LIBRELINKUP_PASSWORD": "your-password",
        "LIBRELINKUP_REGION": "US"
      }
    }
  }
}

Claude Code

claude mcp add librelinkup \
  -e [email protected] \
  -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.

Variable	Meaning
LANGFUSE_PUBLIC_KEY, LANGFUSE_SECRET_KEY	Tracing is on only when both are set
LANGFUSE_BASE_URL	Langfuse URL for self-hosted or regional instances (default: Langfuse Cloud)
LANGFUSE_CAPTURE_DATA	true to include tool inputs, outputs and error messages. Default false

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