# Postscript (npm · @pipeworx/mcp-postscript)

Postscript MCP Pack — SMS marketing for Shopify.

- Trust score: 82/100 (high trust)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- remote · `gateway.pipeworx.io`: 71/100, [markdown](https://verifymcp.io/servers/pipeworx-io-postscript/postscript-mcp.md), [page](https://verifymcp.io/servers/pipeworx-io-postscript/postscript-mcp)
- npm · `@pipeworx/mcp-postscript`: 82/100 (this document), [markdown](https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript.md), [page](https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript)

## Channel facts

- Registry: `npm`
- Package: `@pipeworx/mcp-postscript`
- Version: `0.2.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-11-05.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **Provenance & Transparency**: 97/100
  - Source repository is publicly reachable at the declared URL.
  - Cryptographically verified build provenance (signed, bound to pipeworx-io/mcp-postscript).
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 0 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 76/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 532 tokens (~133/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Postscript MCP server?

Postscript runs locally as an npm package, launched with npx -y @pipeworx/mcp-postscript. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add pipeworx-io-postscript -- npx -y @pipeworx/mcp-postscript
```

### Cursor

```json
{
  "mcpServers": {
    "pipeworx-io-postscript": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-postscript"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "pipeworx-io-postscript": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-postscript"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add pipeworx-io-postscript -- npx -y @pipeworx/mcp-postscript
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "pipeworx-io-postscript": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "@pipeworx/mcp-postscript"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add pipeworx-io-postscript --command npx --arg -y --arg @pipeworx/mcp-postscript
```

### Hermes

```yaml
mcp_servers:
  pipeworx-io-postscript:
    command: "npx"
    args: ["-y", "@pipeworx/mcp-postscript"]
```

### Netclaw

```json
{
  "McpServers": {
    "pipeworx-io-postscript": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "@pipeworx/mcp-postscript"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add pipeworx-io-postscript -t stdio -c npx -a -y @pipeworx/mcp-postscript
```

### Other

```json
{
  "mcpServers": {
    "pipeworx-io-postscript": {
      "command": "npx",
      "args": [
        "-y",
        "@pipeworx/mcp-postscript"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-11-05 (score 82, +1)

- [functional regression] Security disclosure: unverified → fail

### 2026-11-04 (score 81)

First indexed and scored.

## MCP tools (4)

### `postscript_list_subscribers` (~281 tokens)

List SMS subscribers for a Postscript (Shopify) shop. Supports filtering by email, phone number, Shopify customer ID, and created/updated timestamps, plus sorting. Page-based pagination: returns { page_info: { page, total_pages }, subscribers: [...] }; pass page to walk results.

Input parameters:

- `_apiKey` (string, required): Postscript Private API token (Bearer). From Settings → API.
- `created_at__gte` (string): ISO timestamp; subscribers created on/after this time.
- `created_at__lte` (string): ISO timestamp; subscribers created on/before this time.
- `email__contains` (string): Substring email match.
- `email__eq` (string): Exact email match.
- `page` (number): 1-indexed page number (default 1). Walk until page === page_info.total_pages.
- `phone_number__contains` (string): Substring phone match.
- `phone_number__eq` (string): Exact phone match (E.164, e.g. +15551234567).
- `shopify_customer_id__eq` (string): Exact Shopify customer ID match.
- `sort` (string): Sort spec like "created_at__desc" or "updated_at__asc".
- `updated_at__gte` (string): ISO timestamp; subscribers updated on/after this time.

### `postscript_get_subscriber` (~67 tokens)

Get a single SMS subscriber by Postscript subscriber ID. Returns phone number, email, subscription status, Shopify customer linkage, and custom properties.

Input parameters:

- `_apiKey` (string, required): Postscript Private API token (Bearer).
- `subscriber_id` (string, required): Postscript subscriber ID.

### `postscript_list_keywords` (~69 tokens)

List all active SMS keywords for the shop. Keywords are the text-to-join words (e.g. "JOIN") subscribers text to opt in. Returns keyword IDs, the keyword text, and associated subscription settings.

Input parameters:

- `_apiKey` (string, required): Postscript Private API token (Bearer).

### `postscript_get_keyword` (~63 tokens)

Get a single SMS keyword by its ID. Returns the keyword text, status, and configuration (welcome message, list assignment).

Input parameters:

- `_apiKey` (string, required): Postscript Private API token (Bearer).
- `keyword_id` (string, required): Postscript keyword ID.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript#diagnostics

## Score history

- 2026-11-05: 82
- 2026-11-04: 81

## Common questions

### What is the Postscript MCP server?

Postscript is an MCP server listed in the public MCP registry as io.github.pipeworx-io/postscript. Postscript MCP Pack, SMS marketing for Shopify. This page covers its npm package (@pipeworx/mcp-postscript).

### Is the Postscript MCP server safe to use?

Postscript scores 82 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 5 November 2026. It declares no install or post-install scripts. Its build provenance is signed and verified. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Postscript MCP server expose?

Postscript exposes 4 tools: postscript_list_subscribers, postscript_get_subscriber, postscript_list_keywords, postscript_get_keyword. Their descriptions and schemas cost roughly 480 tokens of context every time the server is loaded.

### Is the Postscript MCP server still maintained?

Postscript is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the Postscript MCP server under?

Postscript declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

### What did VerifyMCP test on the Postscript MCP server?

VerifyMCP ran 16 checks on Postscript, covering Malware scan, Known CVEs, Install scripts, Dependency health and 12 more. Endpoint Security and Transport & Reachability do not apply to an npm package, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- npm package: https://www.npmjs.com/package/@pipeworx/mcp-postscript
- Socket report: https://socket.dev/npm/package/@pipeworx/mcp-postscript
- Repository: https://github.com/pipeworx-io/mcp-postscript
- Website: https://pipeworx.io/packs/postscript
- Changelog RSS feed: https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript.xml
- Changelog JSON feed: https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript.json
- HTML version of this page: https://verifymcp.io/servers/pipeworx-io-postscript/pipeworx-mcp-postscript