Book Fitness

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

Description

This skill should be used when the user asks to "book a class", "check yoga schedule", "sign up for fitness", or wants to book a class exactly 24 hours before it starts. It uses the Chelsea Piers REST API directly - no browser automation needed.

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

Endpoint	Method	Purpose
/user/authenticate	POST	Login, get JWT token
/user/account	GET	Get/refresh user info
/classes/search-booking-participations	POST	Search classes
/booking/create-booking	POST	Book a class
/booking/cancel-booking	POST	Cancel a booking

Known IDs

Entity	ID
User ID	12345
Downtown Brooklyn	14
Prospect Heights	15
Flatiron	16

Location Context

Location	ID
Downtown Brooklyn	14
Prospect Heights	15
Flatiron	16

Default to searching all locations unless user specifies.

Activity Group IDs

Activity	ID
Yoga (all types)	1001

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:

op 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:

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

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

Response:

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

Cache the token in 1Password:

op 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

curl -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:

{
  "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:

Found 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

curl -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:

{
  "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

curl -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

class_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

Error	Cause	Action
booking.tooEarlyToBookParticipant	24h window not open	Wait or inform user
401 Unauthorized	Token expired	Re-authenticate
Class full	bookedCount >= classCapacity	Offer waitlist

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:

   Found 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

Tool	Purpose
Bash	1Password CLI + curl requests
AskUserQuestion	Confirm class selection