get_current_glucose

Instructions

Implementation Reference

• src/index.ts:253-272 (handler)

  Main tool handler for 'get_current_glucose'. Calls client.getCurrentGlucose() and returns a JSON response with current_glucose, timestamp, trend, status, and color.

  case 'get_current_glucose': {
    if (!client) {
      throw new Error('LibreLinkUp not configured. Use configure_credentials first.');
    }
  
    const reading = await client.getCurrentGlucose();
  
    return {
      content: [{
        type: 'text',
        text: JSON.stringify({
          current_glucose: reading.value,
          timestamp: reading.timestamp,
          trend: reading.trend,
          status: reading.isHigh ? 'High' : reading.isLow ? 'Low' : 'Normal',
          color: reading.color
        }, null, 2)
      }]
    };
  }

• src/index.ts:80-91 (schema)

  Tool definition and input schema for 'get_current_glucose'. Has an empty input schema (no parameters) and readOnlyHint annotation.

  const tools = [
    {
      name: 'get_current_glucose',
      description: 'Get the most recent glucose reading from your FreeStyle Libre sensor. Returns current glucose value in mg/dL, trend direction (rising/falling/stable), and whether the value is in target range. Use this for real-time glucose monitoring.',
      inputSchema: {
        type: 'object',
        properties: {},
        required: []
      },
      annotations: {
        readOnlyHint: true
      }

• src/librelink-client.ts:399-407 (helper)

  LibreLinkClient.getCurrentGlucose() method. Fetches graph data and maps the current glucose measurement to a GlucoseReading via mapGlucoseItem().

  /**
   * Get current glucose reading
   */
  async getCurrentGlucose(): Promise<GlucoseReading> {
    const data = await this.getGraphData();
    const current = data.connection.glucoseMeasurement;
  
    return mapGlucoseItem(current, this.config.targetLow, this.config.targetHigh);
  }

• src/librelink-client.ts:71-84 (helper)

  mapGlucoseItem() helper that transforms raw API data (RawGlucoseItem) into a GlucoseReading with value, timestamp, trend, isHigh/isLow flags, and color.

  /**
   * Convert raw glucose item to GlucoseReading
   */
  function mapGlucoseItem(item: RawGlucoseItem, targetLow: number, targetHigh: number): GlucoseReading {
    return {
      value: item.ValueInMgPerDl,
      timestamp: item.Timestamp,
      trend: TREND_MAP[item.TrendArrow || 3] || 'Flat',
      trendArrow: item.TrendArrow || 3,
      isHigh: item.isHigh,
      isLow: item.isLow,
      color: getGlucoseColor(item.ValueInMgPerDl, targetLow, targetHigh)
    };
  }

• src/index.ts:243-245 (registration)

  Tool registration via ListToolsRequestSchema handler. Returns the tools array (which includes get_current_glucose) in response to list requests.

  server.setRequestHandler(ListToolsRequestSchema, async () => {
    return { tools };
  });