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Postscript

Read Shopify SMS subscribers and opt-in keywords through Postscript over MCP.

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Install Postscript

Pick your client, then add it in one click or paste the config.

STDIONode.js
~/Library/Application Support/Claude/claude_desktop_config.json
claude_desktop_config.json
{
  "mcpServers": {
    "postscript": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-postscript"
      ]
    }
  }
}

Settings → Developer → Edit Config, merge this into mcpServers, then fully quit and reopen Claude Desktop.

Automated check passed— started and listed 4 tools correctly (5d ago).

Overview

  • postscript
  • shopify
  • sms-marketing
  • subscribers

The Postscript MCP server exposes Postscript SMS marketing data for Shopify shops through four MCP tools. It can list and inspect subscribers, including contact details, subscription status, Shopify customer links, and custom properties, and list or inspect active SMS opt-in keywords. Use the hosted gateway for HTTP-based MCP connections or run the package locally over stdio. The gateway endpoint also includes shared Pipeworx meta-tools, while the standalone package exposes only the Postscript tools.

Use cases

  • List subscribers matching a Shopify customer ID
  • Review a subscriber's SMS subscription status
  • Inspect active opt-in keywords and their settings
  • Check a keyword's welcome message and list assignment

Key features

  • Filter and sort SMS subscriber listings
  • Paginate subscriber results by page
  • Retrieve subscriber and Shopify customer linkage
  • List active SMS opt-in keywords
  • Inspect keyword configuration

Tools4

What Postscript lets your agent do. Expand a tool for its parameters.

Verified live~639 tokens of context

Security & health

What it can reach and how reliably it runs — from our own checks, not the maintainer’s claims.

ActiveLast checked 1d ago

Recent health check succeeded.

7/7 checks healthy over the last 44d

What it can do

From the 4 tools this server returned when we ran it.

Read-only tools · 4
Network at startup3 connections
Files written at startupNone
Install scriptsNone
npm provenanceSigned build
Package age137 days
Maintainers1

Observed 2026-10-17 in an isolated sandbox. A description of reach, not a security audit.

Supply-chain signal

No high-severity advisories surfaced by our automated scan.

Critical 0High 0Medium 0Low 0

Scanned 13d ago via OSV.dev · @pipeworx/mcp-postscript (npm)

Adoption & maintenance

Factual signals from GitHub, npm, and our automated checks — not a rating.

npm downloads445Package downloads in the last 30 days.
Last commit25d agoMost recent push to the default branch.
Availability100%Our rolling endpoint + install checks that succeeded.
Install checkPassedOur sandbox started it and listed its tools.
Tools exposed4Callable tools this server registers over MCP.
Directory activity1 viewsConfig copies, upvotes, and views on AllMCPs.

How Postscript works

What the Postscript MCP server does

The Postscript MCP server connects an MCP client to Postscript data for a Shopify shop. Its focused toolset covers SMS subscribers and the keywords customers use to opt in. This makes it suitable for inspecting subscriber records, checking subscription state, relating a subscriber to a Shopify customer, and reviewing keyword-based signup configuration.

The package does not describe campaign creation, message sending, order data, or subscriber mutations. Its documented operations are read-oriented: two tools retrieve subscriber information and two retrieve keyword information.

How it works

You can connect through the hosted Pipeworx endpoint at https://gateway.pipeworx.io/postscript/mcp, or run @pipeworx/mcp-postscript locally as a stdio MCP server. Both access paths use the same pack tools. The hosted endpoint is part of the Pipeworx gateway and lists the Postscript tools together with shared gateway meta-tools. The local process responds over standard input and output and exposes only the Postscript pack tools.

The gateway also offers a full endpoint at https://gateway.pipeworx.io/mcp. A pack endpoint and the full endpoint reach the same gateway and data sources; the distinction is which pack tools are listed directly. The gateway's ask_pipeworx tool can route questions across the wider catalog, including when the client is connected to the Postscript endpoint.

Setup and configuration

For a client that supports remote MCP connections, add the hosted endpoint as the server URL. A local configuration can start the package with npx -y @pipeworx/mcp-postscript. The package can also be run directly with the same command to verify that it starts.

Calls made through the HTTP tool API require the pack's own API key as _apiKey; the gateway does not provide that key on the user's behalf.

Tools and capabilities

  • postscript_list_subscribers retrieves subscriber pages and supports filters for email, phone number, Shopify customer ID, and created or updated timestamps. Sorting is available, and the response includes page information with the current page and total page count.
  • postscript_get_subscriber retrieves one subscriber by Postscript subscriber ID, including phone, email, subscription status, Shopify customer association, and custom properties.
  • postscript_list_keywords lists active SMS keywords for the shop. Results include keyword IDs, keyword text, and related subscription settings.
  • postscript_get_keyword retrieves a keyword by ID, including its text, status, welcome message, and list assignment.

The Postscript MCP server therefore fits lookup and inspection workflows more closely than write automation. Subscriber pagination requires passing the requested page while walking through results.

Limitations and notes

The hosted pack connection currently includes shared Pipeworx tools in addition to the four pack-specific tools, so tools/list may show more tools than this listing documents. The exact gateway scope is reported by the connection's initialize response. The standalone process avoids those shared meta-tools and does not provide ask_pipeworx routing.

The documented material does not state that the four Postscript tools can create, update, delete, send, or opt subscribers in or out. Treat the pack as a read-access interface unless the connected tool schema documents otherwise. The Postscript MCP server also requires the user's own API key for HTTP tool calls, and no key is supplied by Pipeworx.

Read the full README View source on GitHub

Reviews

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Frequently Asked Questions about Postscript

Postscript is an MCP server that connects AI clients to Postscript SMS marketing data for Shopify shops. Its main tools list and retrieve subscribers, plus list and retrieve active SMS opt-in keywords, including subscription status, Shopify customer links, welcome messages, and list assignments.

Install it locally by configuring your MCP client to run `npx -y @pipeworx/mcp-postscript`. This starts the package as a stdio server. You can also connect to the hosted endpoint at `https://gateway.pipeworx.io/postscript/mcp` instead of running the package locally.

Configure Cursor with the hosted Postscript endpoint or the local `npx -y @pipeworx/mcp-postscript` command, depending on whether you want the gateway connection or standalone stdio mode.

Use `postscript_list_subscribers`. It supports filters for email, phone number, Shopify customer ID, and created or updated timestamps, along with sorting. Results are paginated, so pass the requested page to continue through the subscriber list.

Yes, use `postscript_list_keywords` to list active keywords or `postscript_get_keyword` to retrieve one by ID. The results include keyword text and subscription settings; an individual keyword also includes status, welcome message, and list assignment.

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