Integration · Marketing

Connect Claude & ChatGPT to Postscript

Ask your AI to find an SMS subscriber in Postscript, check whether they are subscribed, or tag them for a campaign. It can subscribe a phone number to one of your keywords, send a text to one existing subscriber, record custom events that can start your automations and read the details of sent messages. It can also unsubscribe someone who asks to stop getting texts.

Connect Postscript free

Free plan, no credit card. Takes about a minute.

Try asking

“Is 555-0142 subscribed to our SMS list?”
The AI searches your subscribers by phone number and shows the subscription status, email, tags and custom properties.
“Which of our opt-in keywords are set up?”
It lists the shop's SMS keywords with their IDs.
“Tag [email protected] as VIP.”
It finds the subscriber by email and adds the tag. Tags are added, not replaced.

What your AI can do

Subscribers

Search subscribers by email, phone or Shopify customer ID, add tags and custom properties, and see who is still pending.

Messages and events

Send an SMS to one existing subscriber, check the status of the send and read sent messages. Record custom events for automations.

Keywords and compliance

List opt-in keywords, subscribe a phone number to a keyword, and unsubscribe people who ask to stop.

“Text subscriber 83921 that her order is ready for pickup.”
It sends one SMS to that existing subscriber. You can also schedule it for later.
“Record a quiz_completed event for [email protected].”
It records the custom event with the properties you give it. Events can start Postscript automations.
“Who signed up but has not confirmed their opt-in yet?”
It lists pending subscribers, filtered by phone number or date if you want.

14 tools for Postscript

These tools are switched on when you connect. You can switch any of them off, or require your approval before it runs.

create_custom_eventChanges dataRecord a custom event for a subscriber (by `subscriber_id`, `email` or `phone`) with an event `type` name and optional `properties`. Events can trigger Postscript automations that text the subscriber.
create_subscriberChanges dataSubscribe a phone number to SMS marketing through a keyword. Needs `phone_number`, `keyword` and `keyword_id` (get both from list_keywords); optional email, tags, origin and custom properties.
get_keywordGet one opt-in keyword by `keyword_id`.
get_message_requestCheck the status of a send request by `message_request_id` (returned by send_message).
get_pending_subscriberGet one pending (not yet confirmed) subscriber by `pending_id`.
get_sent_messageGet one sent message by `message_id`, including its text, recipient and delivery details.
get_shopGet the connected Postscript shop's own details. Use to confirm which shop you are working in.
get_subscriberGet one subscriber by `subscriber_id`, including phone, email, tags, custom properties and subscription status.
list_keywordsList the shop's SMS opt-in keywords with their IDs. Use to find the keyword and keyword ID needed to create a subscriber.
list_pending_subscribersList pending subscribers who have not yet confirmed their opt-in, filtered by phone number, Shopify customer ID or created/updated date ranges.
list_subscribersList SMS subscribers, filtered by `email_eq`, `email_contains`, `phone_number_eq`, `phone_number_contains`, `shopify_customer_id_eq`, `subscription_type` or created/updated date ranges. Paginated with `page`.
send_messageVisible to othersSend an SMS to one existing subscriber, by `subscriber_id` or `phone`, with the text in `body`; optional `media_url` image, `category` and `scheduled_at` for later delivery. This sends a real text message to the customer.
unsubscribe_subscriberVisible to othersUnsubscribe a person from SMS by `phone_number` or `postscript_subscriber_id`. They stop receiving texts from the shop.
update_subscriberChanges dataUpdate a subscriber by `subscriber_id`: add `tags` (tags are added, not replaced), set custom `properties`, or set an email if none is stored yet.

Set up in three steps

1
Pick the app
Create a free PipMCP account and choose Postscript from the app list.
2
Paste your key
Paste your Postscript Private API key (it starts with sk_). In Postscript open Account > API and copy the Private API key, not the Public key. Custom API use requires a Postscript Enterprise plan or older API access.
3
Add the link to your AI
You get a personal MCP link. Add it to Claude, ChatGPT or Cursor:
1. Click your name, then Settings › Connectors › Add custom connector.
2. Paste your link as the Remote MCP server URL.
3. Switch it on from the + menu in a chat.

Questions

What can the AI do in Postscript?

It can read your shop details, subscribers, pending subscribers, keywords, sent messages, send requests and webhooks. It can create and update subscribers, send an SMS to one existing subscriber, record custom events, unsubscribe people and manage webhooks, if you switch those tools on.

Does the AI see my Postscript credentials?

No. Your Postscript credentials are encrypted at rest and never shown to the AI. After you save them, they are not shown again, not even to you. The AI only sees the results of the tools it calls.

Can I control what the AI is allowed to do?

Yes. You choose which tools are switched on, so you can start with lookups only. Sending a text reaches a real person, and unsubscribing someone stops their texts, so those actions can require your approval before they run. Every tool call is logged.

Does it work with ChatGPT?

Yes. In ChatGPT go to Settings › Apps & Connectors › Advanced and turn on Developer mode, then add your PipMCP link. Developer mode needs a paid ChatGPT plan: Plus, Pro, Business or Enterprise. The same link also works in Claude (Settings › Connectors › Add custom connector), Cursor and other MCP clients.

What does it cost?

PipMCP has a free plan with no credit card required. Paid plans bill per completed task. You also need your own Postscript account with API access.

Can the AI send a campaign to my whole list?

No. The send tool texts one existing subscriber at a time, by subscriber ID or phone number, with an optional image and send time. It can tag subscribers and record events, which your own Postscript campaigns and automations can then use.