Fitsly API and MCP server Let your AI agent get every client ready for Monday.

ToolWhat it doesAccess

• manage_clients List the roster, add a client and email the invite, or update a client's details. writeAsks first

  A new client starts as Pending until they finish signup from the invite. The invite reaches the client, so the agent shows the name and email first. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → manage_clients

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/clients/manage

  Parameters

  Parameters: manage_clients

  Name	Type	Description
  action string required	string	One of `list`, `create`, `update`, `resend_invite`. `list` and `get` only read.
  client string	string	Client, for `update` and `resend_invite`.
  coaching_mode string	string	`online` (default), `in_person` or `hybrid`.
  first_name string	string	Required for `create`, up to 35 characters.
  last_name string	string	Required for `create`, up to 35 characters.
  email string	string	Required for `create`: login and invitation address.
  details object	object	Optional: date of birth, sex, height, activity level, units.
  send_invite boolean	boolean	Email the invite on save. Defaults to true.
  onboarding_flow string	string	An onboarding flow that assigns programs, plans, forms and habits.

  Example input

  {
    "action": "action"
  }

  Example response

  {
    "client": "Riley Sample",
    "email": "riley@example.com",
    "coaching_mode": "online",
    "status": "Pending",
    "invite_sent": true
  }

• get_client_overview Read a client's Overview snapshot: last check-in, workouts, calories, steps, sleep, weight and program progress. read

  The Overview fills in as the client logs: last check-in, last and next workout, today's kcals, steps and sleep, weight, body fat and program progress. A Pending client has no data yet and shows as pending. Read only.

  MCP callfitsly_read → get_client_overview

  REST endpointGET https://cotlet.dev/api/v1/fitsly/client-overview

  Parameters

  Parameters: get_client_overview

  Name	Type	Description
  client string required	string	Client name or email, as on the Clients roster.

  Example input

  {
    "client": "client"
  }

  Example response

  {
    "client": "Jamie Example",
    "status": "Active",
    "last_check_in": "2026-11-10",
    "last_workout": "2026-11-13",
    "next_workout": "2026-11-15",
    "kcals_today": 1640,
    "steps_today": 8210,
    "weight_kg": 74.2,
    "program_progress": 62
  }

ToolWhat it doesAccess

• build_workout List library workouts or build one with duration, intensity, focus, sections and sets. writeAsks first

  Saves to Training > Workouts as a library workout you can assign or add to a program. Nothing reaches a client until it is assigned. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → build_workout

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/workout/build

  Parameters

  Parameters: build_workout

  Name	Type	Description
  action string required	string	One of `list`, `create`. `list` and `get` only read.
  name string	string	Up to 100 characters, shown to the client.
  duration_min number	number	Up to 999 minutes. Defaults to 45.
  intensity string	string	`low`, `medium` (default), `high` or `max`.
  focus string	string	Shown on the client's workout preview.
  sections array	array	Sections of exercises, each with sets, rest, tempo, tracking columns and notes. Every section needs an exercise; interval sets need a time.

  Example input

  {
    "action": "action"
  }

  Example response

  {
    "workout": "Upper body A",
    "duration_min": 50,
    "intensity": "medium",
    "exercises": 6,
    "saved": true
  }

• manage_phased_program Create a multi-phase, week-based program, add workouts to its weeks and subscribe clients. writeAsks first

  Under Training > Programs > Phased programs. The editor saves each change as it is made. Subscribing clients puts the program in front of them, so that step waits for your OK. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → manage_phased_program

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/phased-program/manage

  Parameters

  Parameters: manage_phased_program

  Name	Type	Description
  action string required	string	One of `list`, `create`, `add_phase`, `add_workout`, `subscribe_clients`. `list` and `get` only read.
  program string	string	Program name, up to 60 characters.
  phases number	number	For `create`: 1 to 50, default 1.
  weeks_per_phase number	number	For `create`: 1 to 16, default 4.
  phase string	string	Phase name, up to 50 characters.
  workout string	string	Library workout, for `add_workout`.
  day string	string	Weekday the workout lands on.
  clients array	array	For `subscribe_clients`.

  Example input

  {
    "action": "action"
  }

  Example response

  {
    "program": "12-week hypertrophy",
    "phases": 3,
    "weeks_per_phase": 4,
    "subscribed_clients": [
      "Jamie Example"
    ]
  }

ToolWhat it doesAccess

• manage_meal_plans List meal plans, build a multi-day plan from foods and recipes, or assign it to clients. writeAsks first

  A library plan is invisible to clients until assigned. Each client gets their own copy and can log food straight from it. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → manage_meal_plans

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/meal-plans/manage

  Parameters

  Parameters: manage_meal_plans

  Name	Type	Description
  action string required	string	One of `list`, `create`, `assign`. `list` and `get` only read.
  plan string	string	Meal plan name.
  days array	array	For `create`: days, then meals, then options of foods and recipes.
  clients array	array	For `assign`: one or many clients.

  Example input

  {
    "action": "action"
  }

  Example response

  {
    "plan": "High protein, 2,000 kcal",
    "days": 7,
    "assigned": [
      "Jamie Example",
      "Riley Sample"
    ]
  }

• set_macro_targets Read or set a client's daily calorie and macro goals, variance band and date overrides. writeAsks first

  Lives on the client profile under Nutrition > Macro Targets. The client sees new targets in their app. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → set_macro_targets

  REST endpointPUT https://cotlet.dev/api/v1/fitsly/macro-targets

  Parameters

  Parameters: set_macro_targets

  Name	Type	Description
  action string required	string	One of `get`, `update`. `list` and `get` only read.
  client string required	string	Client name or email, as on the Clients roster.
  targets object	object	kcals, protein, carbs and fat per day, a variance band, and dated overrides.

  Example input

  {
    "action": "action",
    "client": "client"
  }

  Example response

  {
    "client": "Jamie Example",
    "kcals": 2100,
    "protein_g": 150,
    "carbs_g": 220,
    "fat_g": 70,
    "variance_pct": 5
  }

• get_food_log Read a client's food log for a day: Breakfast, Lunch, Dinner and Snacks, with calories and macros. read

  Clients log food in the client app by search, barcode scan or from an assigned meal plan; calories and macros add up on their own. This reads the client profile's Nutrition > Food Log. Read only.

  MCP callfitsly_read → get_food_log

  REST endpointGET https://cotlet.dev/api/v1/fitsly/food-log

  Parameters

  Parameters: get_food_log

  Name	Type	Description
  client string required	string	Client name or email, as on the Clients roster.
  date string	string	ISO date. Defaults to today.

  Example input

  {
    "client": "client"
  }

  Example response

  {
    "client": "Jamie Example",
    "date": "2026-11-13",
    "meals": {
      "Breakfast": 420,
      "Lunch": 610,
      "Dinner": 540,
      "Snacks": 180
    },
    "kcals": 1750,
    "protein_g": 138,
    "carbs_g": 172,
    "fat_g": 58
  }

• manage_habits Read habit streaks and completion, or create a habit with a goal, days and reminder for clients. writeAsks first

  Each client gets their own copy, so you can change it for one person. Clients see habits in Today's Tasks and get the push at the time you set. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → manage_habits

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/habits/manage

  Parameters

  Parameters: manage_habits

  Name	Type	Description
  action string required	string	One of `list`, `create`, `assign`. `list` and `get` only read.
  client string	string	For `list`: whose habits to read.
  name string	string	Habit name, for example Daily fruit.
  goal string	string	A measurable amount, such as 8 cups a day or 7,500 steps a day.
  days array	array	Every day, or the weekdays you pick.
  reminder string	string	Push reminder time, in the client's timezone.
  clients array	array	For `create` and `assign`: one or several clients.

  Example input

  {
    "action": "create",
    "name": "Stay hydrated",
    "goal": "8 cups/day",
    "days": [
      "every day"
    ],
    "reminder": "09:00",
    "clients": [
      "Jamie Example",
      "Riley Sample"
    ]
  }

  Example response

  {
    "client": "Jamie Example",
    "habits": [
      {
        "habit": "Stay hydrated",
        "goal": "8 cups/day",
        "streak": 6,
        "completion_7d": 86
      },
      {
        "habit": "Move daily",
        "goal": "7,500 steps/day",
        "streak": 2,
        "completion_7d": 57
      }
    ]
  }

ToolWhat it doesAccess

• send_message Read conversations, or send a direct message, a group message or a broadcast. writeAsks first

  Every message pushes to the client's phone the moment it is sent, and broadcasts arrive with an announcement badge, so the agent shows recipients and text first. `list` reads the inbox with unread counts. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → send_message

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/messages

  Parameters

  Parameters: send_message

  Name	Type	Description
  action string required	string	One of `list`, `send`. `list` and `get` only read.
  to string	string	`direct`, `group` or `broadcast`.
  name string	string	Client or group name.
  text string	string	The message.

  Example input

  {
    "action": "action"
  }

  Example response

  {
    "to": "group",
    "name": "Summer Shred Crew",
    "sent": true
  }

• manage_packages List packages and subscribers, create or edit a Stripe package, or switch one off. writeAsks first

  Packages sell on your storefront through Stripe. A price change is what buyers pay, so it waits for your OK. Switching a package off stops new sales without cancelling anyone on it. By default you confirm each call; you can switch that off for this tool.

  MCP callfitsly_write → manage_packages

  REST endpointPOST https://cotlet.dev/api/v1/fitsly/packages/manage

  Parameters

  Parameters: manage_packages

  Name	Type	Description
  action string required	string	One of `list`, `create`, `update`, `switch_off`. `list` and `get` only read.
  package string	string	Package name.
  price number	number	Price in the package currency.
  billing string	string	`one_time`, `weekly`, `monthly` or `yearly`.
  options object	object	currency, setup fee, free trial days, minimum term, client slots, compare-at price, unlisted.

  Example input

  {
    "action": "action"
  }

  Example response

  {
    "package": "12-Week Transformation",
    "price": 249,
    "currency": "AUD",
    "billing": "monthly",
    "trial_days": 7,
    "slots_left": 20,
    "subscribers": 4
  }