Appointo MCP by usefulapi
io.usefulapi/appointousefulapi.iostreamable-httpv1.0.0Scanned
Read Appointo bookings, availability and subscriptions; create, reschedule and cancel bookings.
10 tools: 4 can delete or cancel things and 6 only read.
- Reads private data · 1
- Reads text others write · 10
- Can send data out · 0
- No findings
Anlyon alternative
4 of these tools change something. Run those as governed actions.
Declare what an action changes, and Anlyon puts it under a shared limit, binds every approval to the exact request, and grades the outcome. It works on any HTTPS API you can describe as an action.
Anlyon does not run, proxy or govern this MCP server. A tool your own code calls directly is not routed through Anlyon and is not governed by it.
Import an OpenAPI spec →Tools
Grouped by what each tool does, most consequential first. Open one for its reasons and full description; descriptions are the publisher's own words.
10 tools
Deletes or cancels 4Claude Code: deny
appointo_cancel_bookingWRITE: cancel a booking, or only some of its customers.Reads text others writeNo findings
Why it is in this group
- The name "appointo_cancel_booking" says "cancel": a word for removing or ending something.
- The description says "Cannot be undone".
- The server marks it destructive (destructiveHint: true).
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it WRITE: cancel a booking, or only some of its customers. The slot is freed and Appointo may notify the customers; whether a Shopify order is refunded is not controlled by this call. Cannot be undone through this server (create a new booking instead). The docs cap this at 100 requests per day. PUT /bookings/cancel.
Annotations the server declares
- title: Cancel booking
- readOnlyHint: false
- destructiveHint: true
- idempotentHint: true
- openWorldHint: true
appointo_create_bookingWRITE: create a booking for a customer on an appointment (bookable service) at a time slot.Reads text others writeNo findings
Why it is in this group
- The name "appointo_create_booking" says "create": a word for a change.
- The server marks it destructive (destructiveHint: true).
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it WRITE: create a booking for a customer on an appointment (bookable service) at a time slot. This is a real booking: Appointo may email the customer a confirmation and reserve the slot; the booking can later be cancelled with appointo_cancel_booking. Check appointo_get_availability first. Not idempotent: calling twice creates two bookings. The docs cap this at 100 requests per day. POST /bookings.
Annotations the server declares
- title: Create booking
- readOnlyHint: false
- destructiveHint: true
- idempotentHint: false
- openWorldHint: true
appointo_reschedule_bookingWRITE: move a booking (or only some of its customers) to a new time slot.Reads text others writeNo findings
Why it is in this group
- The name "appointo_reschedule_booking" says "reschedule": a word for a change.
- The server marks it destructive (destructiveHint: true).
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it WRITE: move a booking (or only some of its customers) to a new time slot. Appointo may notify the customers of the change. override=true forces the booking into the slot even if it is unavailable or full, so leave it off unless the user explicitly asked for it. The docs cap this at 100 requests per day. PUT /bookings/reschedule.
Annotations the server declares
- title: Reschedule booking
- readOnlyHint: false
- destructiveHint: true
- idempotentHint: true
- openWorldHint: true
appointo_update_booking_buffersWRITE: set the start and/or end buffer time (minutes blocked before/after) of one booking.Reads text others writeNo findings
Why it is in this group
- The name "appointo_update_booking_buffers" says "update": a word for a change.
- The server marks it destructive (destructiveHint: true).
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it WRITE: set the start and/or end buffer time (minutes blocked before/after) of one booking. At least one value is required. The docs cap this at 100 requests per day. PUT /bookings/{booking_id}.
Annotations the server declares
- title: Update booking buffer times
- readOnlyHint: false
- destructiveHint: true
- idempotentHint: true
- openWorldHint: true
Only reads 6Show 6 read-only tools
appointo_get_availabilityThe free time slots of one appointment (bookable service) from start_date, optionally to end_date.Reads text others writeNo findings
Why it is in this group
- The name "appointo_get_availability" says "get": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it The free time slots of one appointment (bookable service) from start_date, optionally to end_date. Use it before creating or rescheduling a booking. GET /appointments/{appointment_id}/calendar_availability.
Annotations the server declares
- title: Get availability
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: true
appointo_list_appointmentsList appointments, i.e.Reads text others writeNo findings
Why it is in this group
- The name "appointo_list_appointments" says "list": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it List appointments, i.e. the bookable services/variants, with name, price, currency and configuration. Filter by product or fetch one by id. These are the services customers book, not the bookings themselves (use appointo_list_bookings for those). GET /appointments.
Annotations the server declares
- title: List appointments
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: true
appointo_list_bookingsList bookings with time, product, duration, quantity, price and the customers (name, email, phone, address).Reads private dataReads text others writeNo findings
Why it is in this group
- The name "appointo_list_bookings" says "list": a word for reading.
What it can reach
- private-dataThe description's first sentence says "list" and "email": it reads mail.
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
- untrusted-inputThe description's first sentence says "list" and "email": it reads inbound email, which other people can write.
Description, as the server wrote it List bookings with time, product, duration, quantity, price and the customers (name, email, phone, address). Filter upcoming/past or search; pass booking_id for one booking. The customers' cancel/reschedule link ids are never returned. GET /bookings.
Annotations the server declares
- title: List bookings
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: true
appointo_list_cancelled_bookingsList cancelled bookings, same shape as appointo_list_bookings.Reads text others writeNo findings
Why it is in this group
- The name "appointo_list_cancelled_bookings" says "list": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it List cancelled bookings, same shape as appointo_list_bookings. GET /bookings/cancelled_bookings.
Annotations the server declares
- title: List cancelled bookings
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: true
appointo_list_productsList the Shopify products that are set up as bookable in Appointo: name, appointment type, whether the widget is shown, and each product's appointments (the bookable variants/servi…Reads text others writeNo findings
Why it is in this group
- The name "appointo_list_products" says "list": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it List the Shopify products that are set up as bookable in Appointo: name, appointment type, whether the widget is shown, and each product's appointments (the bookable variants/services with price, currency and id). Use an appointment id for availability and bookings. GET /products.
Annotations the server declares
- title: List bookable products
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: true
appointo_list_subscription_contractsList the recurring booking subscription contracts (customers who subscribed to repeat appointments).Reads text others writeNo findings
Why it is in this group
- The name "appointo_list_subscription_contracts" says "list": a word for reading.
What it can reach
- untrusted-inputThe server marks it openWorldHint: true: it reaches things outside the server's own data.
Description, as the server wrote it List the recurring booking subscription contracts (customers who subscribed to repeat appointments). Search by product, variant, order number or customer name. The API documents no paging for this list. GET /appointment_subscriptions.
Annotations the server declares
- title: List subscription contracts
- readOnlyHint: true
- destructiveHint: false
- openWorldHint: true
This is not a safety rating, and no finding is not a safety guarantee. The groups and findings come from fixed checks of the tool definitions the server returned on the date shown, not from its code or what it does when called. How the checks work.
Exfil surface
Which tools read private data, which read text someone else can write, and which can send data out. One of each is a path a prompt injection can use.
No private-data, untrusted-input, outbound path in this server alone: no tool is tagged outbound.
- Reads private data1
- Reads files, mail, messages, databases, secrets, calendars or repositories.
- Reads text others write10
- Brings in text someone else can write: web pages, inbound email, messages, issues and comments.
- Can send data out0
- Can carry data to people or systems: it sends, posts or publishes, or takes a recipient, channel or URL.
Other servers in the same agent add their own tools to these paths. Audit your whole setup to see them together.
Findings
Matches of fixed checks, with the text they matched.
No check matched anything in these tool definitions. That is not a safety guarantee.
History
Changes to its tool definitions and to its remote endpoint, newest first.
No change seen yet. Its tools are rescanned every day, and a remote endpoint is looked at once a week.
Install
Pinned to version 1.0.0. Values in angle brackets are yours to fill in.
claude mcp add --transport http appointo https://appointo.usefulapi.io/mcpclaude mcp add --transport http appointo https://appointo.usefulapi.io/mcpRun in a terminal.
Claude Code permissions
Allow the reads, ask before a change or a way out, deny the deletes. Paste into .claude/settings.json.
{
"permissions": {
"allow": [
"mcp__appointo__appointo_list_products",
"mcp__appointo__appointo_list_appointments",
"mcp__appointo__appointo_get_availability",
"mcp__appointo__appointo_list_bookings",
"mcp__appointo__appointo_list_cancelled_bookings",
"mcp__appointo__appointo_list_subscription_contracts"
],
"ask": [],
"deny": [
"mcp__appointo__appointo_create_booking",
"mcp__appointo__appointo_reschedule_booking",
"mcp__appointo__appointo_cancel_booking",
"mcp__appointo__appointo_update_booking_buffers"
]
}
}Tools that only read are allowed, tools that change things ask first, tools that delete or cancel are denied. A read that can send data out (it takes a URL, say) asks first too. It assumes the server is installed as appointo. Review it before you use it.
Capability tags behind 10 rules
- mcp__appointo__appointo_list_products untrusted-input
- mcp__appointo__appointo_list_appointments untrusted-input
- mcp__appointo__appointo_get_availability untrusted-input
- mcp__appointo__appointo_list_bookings private-data, untrusted-input
- mcp__appointo__appointo_list_cancelled_bookings untrusted-input
- mcp__appointo__appointo_list_subscription_contracts untrusted-input
- mcp__appointo__appointo_create_booking untrusted-input
- mcp__appointo__appointo_reschedule_booking untrusted-input
- mcp__appointo__appointo_cancel_booking untrusted-input
- mcp__appointo__appointo_update_booking_buffers untrusted-input
Pin
Keep the decision: fail CI when the tools change, follow every change, or show a badge.
Pin in CI
Fail a build when the tools you reviewed are not the tools the server serves today.
curl -s "https://anlyon.dev/api/v1/servers/io.usefulapi/appointo/verify?hash=f51f2d4bd63c874f6d6268384054ca8c2a502c30794467d16b1b67dd18dab87f" | jq -e '.changed == false'Pinned hash f51f2d4bd63c, from Oct 24, 2026, 12:18 UTC.
Watch
Get told when its tools change: a new tool, a new description, a new class.
https://anlyon.dev/servers/io.usefulapi/appointo/changes.xmlAn Atom feed. Works in any feed reader or Slack's RSS app.
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[](https://anlyon.dev/servers/io.usefulapi/appointo)Source: MCP Registry · repository. Synced Oct 24, 2026, 12:17 UTC.