Wellness Cgm MCP vs Tebra

cgm_glucose_now

Returns the most recent EGV (estimated glucose value) plus trend arrow if available.

cgm_glucose_window

Returns all EGVs over the last N hours (default 24). `hours` is the window REQUESTED; `hours_covered` and `observed_window` state what the provider actually returned. FreeStyle Libre (LibreLink Up) caps a live read at ~12h regardless of the request, so any wider ask comes back short and `notes` says so — read the covered window, not the requested one.

cgm_hypo_events

v0.3.3 — Detect hypoglycemia events between `from` and `to` ISO dates. Returns an array of contiguous below-threshold runs lasting ≥ `min_duration_minutes`, each with `started_at`, `ended_at`, `duration_minutes`, `min_glucose_mg_dl`, `mean_glucose_mg_dl`, `severity` (level_1 = <70 ADA Level 1, level_2 = <54 ADA Level 2), and `recovery_time_minutes` (time to first reading ≥ threshold+10). Also returns `total_events`, `total_minutes_below`, `mean_min_glucose`, `events_per_day`, a `summary` string, and `recommendations` grounded in what was actually observed. `window` is the span REQUESTED; `hours_covered`, `observed_window` and `window_truncated_by_provider` state what the provider actually returned — FreeStyle Libre (LibreLink Up) caps a live read at ~12h, so a 3-day question can be answered from half a day and `notes` says so. "No hypos" is only true for `hours_covered`. **MEDICAL DISCLAIMER: NOT medical advice. Do not use for treatment decisions. Hypo events should be discussed with your clinician.**

cgm_daily_summary

Returns daily glucose stats: mean, median, min/max, stdev, GMI (estimated A1C), CV, time-in-range (diabetic 70-180 + metabolic-health 70-140). `window_hours` is what was REQUESTED; every stat is computed over `hours_covered` / `observed_window`, which can be shorter — FreeStyle Libre (LibreLink Up) caps a live read at ~12h, so a 72h request yields a half-day metric and `notes` flags it. Never report these numbers as covering more than `hours_covered`.

cgm_time_in_range

Compute Time in Range (TIR), Time Below Range, and Time Above Range over a specific time window with a customizable target range. Use this for mealtime TIR (e.g. 7am-10am breakfast window), overnight TIR (e.g. 23:00-07:00), or specific date-range comparisons. Returns total_readings, readings_in_window, mean_glucose, median_glucose, and GMI (Glucose Management Indicator, estimated A1C per ADA / Bergenstal 2018: GMI% = 3.31 + 0.02392 × mean_mg_dL). Supports a `time_window` preset ("wake" = 06:00-22:00, "sleep" = 22:00-06:00, "all") OR explicit `start_hour` / `end_hour` (0-24, UTC) for recurring hour-of-day filtering. Defaults: 24h load, ADA 70-180 mg/dL, time_window=all. Pulls from cgm_glucose_window data; falls back to mock in unauth mode.

cgm_meal_response

Compute glucose response to a meal: baseline → peak → return-to-baseline. Returns peak delta, peak time (min after meal), and a band (excellent/good/moderate/poor).

cgm_authorize_url

Read-only OAuth URL generation; does not exchange tokens. Not a state mutation of glucose data. Gated by: user must open URL themselves (explicit user action). Builds the Dexcom OAuth authorize URL. The user opens it, grants access, and Dexcom redirects to your registered DEXCOM_REDIRECT_URI with an auth code. If credentials are missing, returns a hint with the exact env vars needed.