Return the authenticated coach (user id, name, email, role) and trainer id. Use to verify the connection.

List the coach's clients (id, name, email). Use the returned _id as clientId/userId for other tools.

Get a client's fitness profile + computed metrics (BMI, TDEE, recommended calories). Pass the client's user _id.

List a client's active habits with today's log and streaks. Pass the client's user _id as clientId.

Habit compliance percentage (0-100) for a client over a date range (YYYY-MM-DD).

Recent habit completions across all of the coach's clients (newest first).

List the coach's reusable Master Habit library.

Compute BMR, TDEE, and recommended daily calories from client stats.

Compute a macro split (protein/carbs/fat in grams) for a strategy. STANDARD=40/30/30, PRO=g/kg multipliers, KETO=25/5/70.

Estimate a 1-rep max (Epley) and %1RM weight suggestions from a working set.

List a client's workout plans (id, title, dates). Pass the client's user _id.

List a client's diet plans (id, title, dates). Pass the client's user _id.

List check-ins for the coach (optionally filtered to one client by user _id).

List sessions — for one client (pass clientId) or all of the coach's clients.

List the coach's client subscriptions (id, subscriber = client id, status). Use a subscription _id when scheduling a session.

Summarise the coach's payments: total captured amount (minor units), currency, and counts by status.

Create a habit for a client (confirm-gated). daysOfWeek: 0=Sun..6=Sat (empty = every day). reminderTime: 'HH:mm'.

Create a reusable Master Habit in the coach's library (confirm-gated).

Assign a Master Habit to one or more clients — creates a habit per client (confirm-gated).

Schedule a check-in for a client with optional questions (confirm-gated). scheduledFor: ISO date. question.type: TEXT|NUMBER|SCALE|PHOTO.

Book a session for a client (confirm-gated). Needs the client's subscriptionId (see list_subscriptions). Times are ISO strings.

Create a workout plan for a client (confirm-gated). exercises: array of { name, sets, reps, restSeconds?, section? }. section must be one of WARMUP | RESISTANCE | STRETCHING | CARDIO | COOL_DOWN (defaults to RESISTANCE so the app renders them under 'Main Workout'). days: optional [MONDAY..SUNDAY].

Create a diet plan for a client (confirm-gated). meals: array of MealInput objects (e.g. { name, slot, calories, macros, days }).