Sync health data to the local cache.

Fetches data from the Google Health API and stores it in SQLite for fast offline queries. Run this before using other health_get_* tools.

Syncs incrementally: only fetches data newer than the most recent entry in each table. First sync fetches the specified number of days.

Args: data_types: What to sync. Options: "all", "heart_rate", "activity", "exercises", "sleep", "weight", "spo2", "hrv", "azm", "breathing_rate", "skin_temperature", "core_temperature", "cardio_fitness", "food_log", "ecg", "irn". Comma-separated for multiple, e.g. "sleep,hrv". Default: "all". days: Days of history for first sync (default: 30). Ignored on subsequent syncs (uses last synced date). since: Optional "YYYY-MM-DD" backfill date. When set, fetches from this date regardless of what is already cached - use to pull history older than the current cache. Overrides incremental resume and days. until: Optional "YYYY-MM-DD" inclusive end date; requires since. Together they re-fetch and upsert exactly the since..until window - use to repair a gap in the middle of the cache without re-pulling everything from the gap to today.

Returns summary of records synced per data type. Not for querying data - use health_get_heart_rate, health_get_activity, health_get_sleep, etc. instead.

Get daily activity summaries (steps, calories, active minutes, distance).

Returns data from the local cache by default. Use live=True to fetch from the API. Run health_sync first to populate the cache.

Note: live=True fetches one API call per day - avoid large ranges to stay within the 150 requests/hour rate limit.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per day with steps, calories, active minutes, distance. active_minutes = very_active + fairly_active (excludes lightly active).

Analyse trends in cached health data.

Computes averages and totals over time from the local cache, auto-syncing if stale.

Args: data_type: What to analyse. Options: "heart_rate", "activity", "exercises", "sleep", "weight", "spo2", "hrv", "azm", "breathing_rate", "skin_temperature", "core_temperature", "cardio_fitness", "food_log". Default: "activity". period: Aggregation period. Options: "weekly", "monthly", "quarterly". Default: "monthly". start_date: Start date as "YYYY-MM-DD" or "365d". Default: last 12 months. end_date: End date as "YYYY-MM-DD". Default: today. compare: Compare two periods. Format: "last_30d vs previous_30d", "2026-03 vs 2026-02", "2026-Q1 vs 2025-Q4". When set, period/start_date/end_date are ignored.

Returns aggregated averages per period. For activity: steps, distance, active minutes. For exercises: sessions, duration, calories. For sleep: duration, efficiency, stage breakdown. For heart_rate: resting HR min/avg/max. For weight: weight, fat%, BMI. For hrv: daily and deep RMSSD.

Two data types report their history under two definitions, each with the count of readings behind it - never merge them into one series. For spo2, min_spo2/max_spo2 are observed nightly extremes, while avg_nightly_ci_low/avg_nightly_ci_high average the nightly bounds of a confidence interval on each night's own average. For cardio_fitness, avg_vo2_max_low/high average a reported band while avg_vo2_max averages a single value.

Those per-definition fields and their counts appear in the period form only. compare= reports spo2 as avg_spo2 alone, which is deliberate and not a gap: that column means the same thing under both definitions, so it is the one figure two windows either side of the switchover can be compared on. Ask for the period form when you need to know which definition is behind a number. cardio_fitness has no such neutral column, so compare= carries both definitions there. Not for raw data - use health_get_* tools instead.

Get daily Active Zone Minutes (AZM), the headline cardio metric.

AZM counts minutes spent in heart rate zones at or above Fat Burn intensity. total_minutes is the plain sum of the three zone columns as reported, not a weighted one. Returns from local cache by default, auto-syncing if stale.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per day with total_minutes plus per-zone breakdown (fat_burn_minutes, cardio_minutes, peak_minutes). Distinct from active_minutes in health_get_activity, which counts wall-clock minutes regardless of intensity - and which has no source in this API, so it is present only for days that arrived by import.

Get nightly breathing rate (avg breaths per minute during sleep).

Sourced during sleep tracking. Useful as an illness/recovery signal: sustained increases of 2-3 bpm above personal baseline can indicate incipient infection or strain. Returns from cache by default, auto-syncing if stale.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per night with breaths_per_min. Typical adult range: 12-20 bpm at rest.

Get Cardio Fitness Score (VO2 Max estimate).

Estimated from resting HR, HR during walks and runs, and demographics. Updates roughly weekly. Returns from cache by default, auto-syncing if stale.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

A reading usually carries a range or a single value; one re-synced across the switchover between providers can hold both. They are different measurements - do not average them together or fill one from the other. vo2_max_low and vo2_max_high are a reported band (e.g. 39-43); vo2_max is a single figure. All in mL/kg/min, higher being better cardiorespiratory fitness.

List paired devices with battery level and last sync time.

Live-only (no caching) - reflects current device state. Useful for monitoring tracker health, knowing which device produced data, and spotting sync gaps.

Returns one entry per paired device with id, type, device_version, battery (e.g. "High"), battery_level (0-100), last_sync_time, mac, and features list.

Get exercise log entries (individual tracked activities).

Returns exercise sessions from the local cache by default. Use live=True to fetch from the API. Run health_sync first to populate the cache.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. exercise_type: Filter by activity name (case-insensitive substring match), e.g. "cycling", "walk", "run". Default: all types. live: If true, re-fetch this window from the API before reading the cache.

Returns exercise entries with name, duration, calories, avg heart rate, distance, and source (auto-detect vs manual). Note: HR data from cycling may be unreliable (optical sensor vs handlebar grip).

Get daily food and water log summary.

Returns calories consumed and water intake (in mL) per day. Only populated where the user logs food or water by hand in a connected app. Returns from cache by default, auto-syncing if stale.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per day with calories_in and water_ml. Days with no logging are omitted.

Get daily resting heart rate and heart rate zones.

Returns resting HR and zone breakdown (Out of Range, Fat Burn, Cardio, Peak) from the local cache by default, auto-syncing if stale.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per day with resting_hr and zones array. Zone data: name, minutes, caloriesOut, max/min HR for each zone.

Get nightly HRV (heart rate variability) data.

Returns data from the local cache by default. Use live=True to fetch from the API. Run health_sync first to populate the cache.

HRV data is sparse: only nights with on-wrist sleep tracking produce readings.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per night with daily_rmssd and deep_rmssd (ms). RMSSD = root mean square of successive RR interval differences. Higher values generally indicate better recovery and parasympathetic activity.

Get all-time activity totals and personal best records.

Totals for steps, floors, distance and calories over every day held in the cache, plus the best single day for steps, floors and distance with the date each record was set.

The answer is bounded by what has been synced, so it is returned with a coverage block giving the first and last dates and the number of days counted - read it before quoting a total as all-time. There is no tracker-versus-total split and no "active score"; neither has a source.

Get electrocardiogram (ECG) readings taken on the watch.

Each reading is a single-lead trace the user started by hand, with a rhythm classification - NORMAL_SINUS_RHYTHM, ATRIAL_FIBRILLATION, or one of several inconclusive results (low or high heart rate, poor reading, unclassified). Use it for questions about heart rhythm or AFib checks; for resting rate over time use health_get_heart_rate instead.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache. include_waveform: If true, include the raw voltage samples. These are thousands of integers per reading - ask for them only to analyse the trace itself. Multiply by scaling_factor for millivolts, and read them at sampling_hz samples per second.

Returns one entry per reading with classification, avg_bpm, duration_sec, sampling_hz, scaling_factor and waveform_samples (null where no trace was stored, or where the stored one cannot be read).

Get irregular heart rhythm notifications raised by the watch.

These are background checks the watch runs while the user is still - an alert means it saw a rhythm consistent with atrial fibrillation over one or more windows, not a diagnosis. Most accounts never have one. For a deliberate reading with a trace behind it, use health_get_ecg.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per notification with start_time, end_time and alert_windows (the periods that triggered it).

Get nightly sleep data (duration, stages, efficiency).

Returns sleep data from the local cache by default. Use live=True to fetch from the API. Run health_sync first to populate the cache.

Sleep data is sparse: only nights with watch-tracked sleep are present. Travel, off-wrist nights, or manual logs may be missing.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per night with total_minutes, efficiency, start/end times, and stage breakdown (deep, light, REM, wake minutes).

Get nightly SpO2 (blood oxygen saturation) data.

Returns data from the local cache by default. Run health_sync first to populate it.

SpO2 data is sparse: only nights with on-wrist sleep tracking produce readings.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per night with avg SpO2 percentage, and a pair of bounds whose meaning depends on which provider recorded the night: min/max are the observed nightly extremes, avg_ci_low/avg_ci_high are a confidence interval on that night's average. Only an import fills the first pair and only this API fills the second, so a night covered by both carries all four - which is the ordinary case wherever an imported history overlaps the synced one. They are different measurements: never compare or average across them. Normal range: 95-100%. Below 90% may indicate sleep apnea.

Get nightly skin temperature variation (degrees Celsius from personal baseline).

This is the device-derived RELATIVE deviation recorded during sleep, NOT an absolute body temperature - for fever / body-temperature readings use health_get_core_temperature instead. A baseline takes about three nights to establish before values appear. Useful as an illness/cycle/recovery signal.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per night with nightly_relative (degrees C, can be negative) and log_type (e.g. "dermal").

Get manually-logged core (body) temperature readings (degrees Celsius).

These are absolute body temperatures the user enters by hand - a thermometer reading logged in an app - and are the right source for fever / body-temperature questions. They are NOT the device-derived nightly skin-temperature variation from health_get_skin_temperature. A single day can hold several readings (each timestamped), useful for tracking a fever over time.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per logged reading with datetime (YYYY-MM-DDThh:mm:ss) and temp_celsius.

Get weight log entries (weight, BMI, body fat percentage).

Returns data from the local cache by default. Use live=True to fetch from the API. Run health_sync first to populate the cache.

Weight data is sparse: only days with weigh-in entries are present.

Args: start_date: Start date as "YYYY-MM-DD", "YYYY-MM", or "30d". Default: last 30 days. end_date: End date as "YYYY-MM-DD". Default: today. live: If true, re-fetch this window from the API before reading the cache.

Returns one entry per weigh-in with weight_kg, bmi, fat_pct.