---

name: book-fitness description: Book fitness classes at Chelsea Piers via REST API with JWT caching. Use when the user asks to book a class, check yoga schedule, sign up for fitness, or book a class exactly 24 hours before it starts.

Book Fitness

A skill for checking and booking fitness classes at Chelsea Piers via direct API calls.

Trigger Phrases

• "book yoga" / "book a yoga class"
• "check yoga schedule"
• "book [class type] at Chelsea Piers"
• "what classes are available tomorrow"
• "sign me up for [class name]"
• "cancel my [class] booking"
• /book-fitness [class type]
• /book-fitness (defaults to yoga)

Prerequisites

1. 1Password CLI must be installed and configured (op command available)
2. Chelsea Piers credentials stored in 1Password with title "Chelseapiers"

API Reference

Base URL: https://mymembership.chelseapiers.com/api

Endpoints

Known IDs

Location Context

Default to searching all locations unless user specifies.

Activity Group IDs

Other activity IDs TBD - discover by removing filter and inspecting responses.

Workflow

Step 1: Check for Cached Token

First, try to get a cached token from 1Password:

Copyop item get "Chelseapiers" --fields token,token_expiry --format json

If token exists and token_expiry > now, skip to Step 3.

Step 2: Authenticate (if needed)

Get credentials and authenticate:

Copyop item get "Chelseapiers" --fields username,password --format json

Copycurl -s -X POST https://mymembership.chelseapiers.com/api/user/authenticate -H "Content-Type: application/json" -d '{"email":"<username>","password":"<password>","sessionTimeoutOneMonth":false}'

Response:

Copy{
  "user": {"userId": 12345, "centerId": 14, "firstName": "Demo", ...},
  "token": "eyJ...",
  "expiry": "2026-01-02T19:37:58.202Z"
}

Cache the token in 1Password:

Copyop item edit "Chelseapiers" token="<jwt_token>" token_expiry="<expiry_timestamp>"

This avoids re-authenticating on every request.

Notes:

• Use single-line curl commands. Multi-line commands with \ continuations can fail.
• Avoid complex $() command substitution chains. Run commands separately and use the output directly.
• Store the token in a variable or substitute it directly into the curl command.

Step 3: Search for Classes

Copycurl -s -X POST "https://mymembership.chelseapiers.com/api/classes/search-booking-participations?selectedUserId=12345&selectedUserCenterId=14" -H "Content-Type: application/json" -H "Authorization: Bearer <token>" -d '{"activityGroupIds":[1001],"activityIds":[],"centers":[14,15,16],"dateFrom":"<date>","dateTo":"<date>"}'

Response: Array of class objects:

Copy{
  "centerId": 14,
  "centerName": "Downtown Brooklyn",
  "personId": 12345,
  "participationListIndex": -1,
  "waitingListIndex": -1,
  "booking": {
    "id": 151433,
    "name": "Yoga Restorative",
    "date": "2026-01-02",
    "startTime": "18:30",
    "endTime": "19:30",
    "durationMinutes": 60,
    "instructorNames": ["Jane Doe"],
    "roomNames": ["Yoga Studio"],
    "bookedCount": 0,
    "classCapacity": 20,
    "waitingListCount": 0
  }
}

Key fields:

• booking.id -> The bookingId for create-booking
• participationListIndex -> -1 = not booked, else your position
• waitingListIndex -> -1 = not on waitlist
• bookedCount vs classCapacity -> availability

Step 4: Present Options to User

Parse the response and show matching classes:

CopyFound 3 yoga classes on Jan 2:

1. Hot Yoga Flow - 9:30 AM @ Downtown Brooklyn
   Instructor: Alex Smith | 38/38 (FULL, 7 waitlist)

2. Hot Yoga Athletic - 12:30 PM @ Downtown Brooklyn
   Instructor: Sam Johnson | 17/40 spots

3. Yoga Restorative - 6:30 PM @ Downtown Brooklyn
   Instructor: Jane Doe | 0/20 spots

Use AskUserQuestion to confirm which class to book.

Step 5: Book the Class

Copycurl -s -X POST https://mymembership.chelseapiers.com/api/booking/create-booking -H "Content-Type: application/json" -H "Authorization: Bearer <token>" -d '{"selectedUserId":12345,"selectedUserCenterId":14,"bookingCenterId":<centerId>,"bookingId":<bookingId>}'

Success: Returns updated booking info.

Too Early Error:

Copy{
  "errorI18NMessage": "booking.tooEarlyToBookParticipant",
  "httpCode": 400
}

Step 6: Report Result

Confirm to user:

• Class name, time, location
• Instructor
• Whether booked or added to waitlist

Cancellation

Cancel a Booking

Copycurl -s -X POST https://mymembership.chelseapiers.com/api/booking/cancel-booking -H "Content-Type: application/json" -H "Authorization: Bearer <token>" -d '{"bookingId":<bookingId>}'

To find bookings to cancel, search classes and look for participationListIndex >= 0.

24-Hour Advance Booking

Classes open for booking exactly 24 hours before start time.

Logic

Copyclass_start = "2026-01-02T18:30:00"
booking_opens = class_start - 24h = "2026-01-01T18:30:00"
current_time = now()

if current_time >= booking_opens:
    -> Book immediately
elif booking_opens - current_time < 5 minutes:
    -> Wait and retry
else:
    -> Tell user when booking opens

Handling "Too Early" Error

If create-booking returns booking.tooEarlyToBookParticipant:

1. Calculate when booking opens (class time - 24h)
2. If within 5 minutes, wait and retry
3. Otherwise, inform user of opening time

Error Handling

Example Session

User: "book yoga tomorrow morning"

Assistant:

1. Check for cached token in 1Password
2. Search yoga classes for tomorrow across all locations
3. Present options:

   CopyFound 3 morning yoga classes for Jan 2:
   
   1. Hot Yoga Flow - 9:30 AM @ Downtown Brooklyn
      Instructor: Alex Smith | 38/38 (FULL)
   
   2. Yoga Flow - 8:30 AM @ Prospect Heights
      Instructor: Jordan Lee | 25/40 spots
   
   3. Hot Yoga Flow - 7:15 AM @ Flatiron
      Instructor: Morgan Chen | 10/48 spots
   
   Which would you like to book?
   

4. User picks #2
5. Book it -> success
6. "Booked Yoga Flow at 8:30 AM tomorrow at Prospect Heights"

Tools Used