Scheduleonce for AI agents

ScheduleOnce, part of OnceHub, is a scheduling platform that captures inbound leads, qualifies them, and books meetings directly on a booking calendar. Connect it once through Arc0, and your agent, or Claude, ChatGPT and Cursor, can use it through one MCP endpoint, limited to what each user approved.

Connect Scheduleonce See the 27 actions ↓

SchedulingOAuth 2.0MCP + RESToncehub.com

AUDIT LOG · SCHEDULEONCEPOLICY: acme-support

09:41:07 · claude · u_8f2read

scheduleonce.list_all_teams

List All Teams✓ allowed · 212ms

09:41:08 · claude · u_8f2read

scheduleonce.test_api_key

Test API Key✓ allowed · 164ms

09:41:09 · claude · u_8f2write

scheduleonce.create_user

Create User✓ approved · approved by user

09:41:12 · claude · u_8f2destructive

scheduleonce.delete_user

Delete User✕ blocked · policy: deny

EVERY SCHEDULEONCE CALL, ON THE RECORD

01 · USE CASES

What agents do in Scheduleonce.

Check available time slots

Reads open slots on a booking calendar before offering times to a lead.

Book a time slot for a lead

Reserves a meeting slot on the calendar and links it to the lead's contact record.

Cancel a booking only after confirmation

Cancels a scheduled meeting only once the requester confirms the change with the lead.

02 · ACTIONS

27 Scheduleonce actions, graded by risk.

Every Scheduleonce action is tagged read, write or destructive, so one policy covers the whole app and new actions inherit the right default.

read

Look things up. Allowed by default.

scheduleonce.list_all_teams
List All Teams
scheduleonce.list_all_users
List All Users
scheduleonce.get_single_user
Get Single User
scheduleonce.list_all_bookings
List All Bookings
scheduleonce.list_all_contacts
List All Contacts
scheduleonce.get_single_booking
Get Single Booking
scheduleonce.get_single_contact
Get Single Contact
scheduleonce.list_all_event_types
List All Event Types
scheduleonce.list_all_master_pages
List All Master Pages
scheduleonce.get_single_master_page
Get Single Master Page
scheduleonce.list_all_booking_pages
List All Booking Pages
scheduleonce.get_available_time_slots
Get Available Time Slots
scheduleonce.list_all_booking_calendars
List All Booking Calendars
scheduleonce.get_single_booking_calendar
Get Single Booking Calendar
scheduleonce.get_user_scheduling_availability
Get User Scheduling Availability
scheduleonce.test_api_key
Test API Key

write

Create and change things. Allow, or ask the user first.

scheduleonce.create_user
Create User
scheduleonce.update_user
Update User
scheduleonce.create_contact
Create Contact
scheduleonce.update_contact
Update Contact
scheduleonce.update_user_scheduling_availability
Update User Scheduling Availability
scheduleonce.create_one_time_link_for_booking_calendar
Create One-Time Link for Booking Calendar
scheduleonce.book_time_slot
Book Time Slot
scheduleonce.mark_booking_as_no_show
Mark Booking as No-Show

destructive

Delete, cancel or archive. Ask first, or deny outright.

scheduleonce.delete_user
Delete User
scheduleonce.cancel_booking
Cancel Booking
scheduleonce.delete_contact
Delete Contact

03 · HOW IT WORKS

Scheduleonce in three steps.

01Your users connect ScheduleonceThey sign in to Scheduleonce on Arc0 Connect, under your brand, and approve the access you ask for.
02You set the rulesReads run, writes like “create User” can wait for the user, and “delete User” can be denied outright.
03Any agent can actYour agent calls Scheduleonce through the Arc0 SDK or MCP, and so can Claude, ChatGPT and Cursor. Every call lands on the audit log.

POLICY.TS

await arc0.policies.set('scheduleonce', {
  read: 'allow',
  write: 'ask',        // create_user
  destructive: 'deny',  // delete_user
})

# Claude Code: the same connection, one URL
$ claude mcp add --transport http arc0 \
    https://mcp.arc0.ai/u/u_8f2

04 · AUTH AND DATA

How Scheduleonce connects.

Users sign in to Scheduleonce on Arc0 Connect and approve the scopes you request. Build with Arc0’s Scheduleonce OAuth app, or bring your own so the Scheduleonce consent screen names you. Tokens refresh automatically, and you can export them whenever you want.

The same Scheduleonce connection serves your agent over MCP and your own backend over REST and the proxy, so a user connects once. How Arc0 handles credentials →

AUTH: API key · OAuth 2.0
CREDENTIALS: Per-tenant encrypted vault
MODEL SEES: Results only, never credentials
AUDIT LOG: Every call, on every plan

05 · WORKS WITH

Use Scheduleonce from any agent.

Claude

ChatGPT

Cursor

Codex

VS Code

OpenAI Agents SDK

Claude Agent SDK

Vercel AI SDK

Mastra

LangGraph

06 · RELATED

More scheduling apps.

Google Calendar50 actions

Calendly57 actions

Apaleo29 actions

Cal175 actions

Bookingmood142 actions

Eventbrite95 actions

Etermin78 actions

Ticket Tailor77 actions

ALL SCHEDULING APPS →

07 · FAQ

Scheduleonce and Arc0, answered.

Q01

Can I use Scheduleonce with Claude, ChatGPT or Cursor?

Yes. Connect Scheduleonce to Arc0 once, then add your Arc0 MCP URL to Claude, ChatGPT, Cursor, Claude Code or any other remote-MCP client. Each assistant only gets the Scheduleonce actions you allow.

Q02

How do users connect Scheduleonce?

Q03

Which Scheduleonce actions can my agent take?

27 in total: 16 read, 8 write and 3 destructive, such as “create User”. Your policies decide which of them each agent may call.

Q04

Can I stop my agent from deleting things in Scheduleonce?

Yes. Actions like “delete User” are graded destructive. Set destructive actions to deny, or to ask so the user approves each one, and blocked calls still show up on the audit log.

Q05

Can my own backend call Scheduleonce too?

Yes. The same Scheduleonce connection is available over REST and through the Arc0 proxy, so your product and your agent share one connection per user.

Get started

Plug Scheduleonce into your agent.

Your users connect Scheduleonce once, under your brand. Your agent gets 27 actions behind your policies, with every call on the record.

Connect Scheduleonce Browse all apps →

Free to build · MCP + REST · Audit log on every plan