Arch

Cursor and Grok Bot plugin with two MCP tools:

• arch_review — paid theological review of faith, Scripture, or doctrinal text

• kjv_lookup — free, offline King James verse lookup from text bundled in this plugin

Arch endpoint: POST https://arch.tnvolman.com/v1/review
Auth (arch_review only): X-API-Key from the plugin variable ARCH_API_KEY (each end user supplies their own key)
Homepage: https://arch.tnvolman.com

kjv_lookup does not use the key, does not call the network, and does not charge.

Install

Install this repository as a Cursor or Grok Bot plugin (marketplace listing, or a local plugin directory that contains .cursor-plugin/plugin.json).

The plugin starts a zero-dependency Node stdio server. The launch command is the arch-mcp executable (bin/arch-mcp), which runs server/index.mjs:

{
  "mcpServers": {
    "arch": {
      "command": "${CURSOR_PLUGIN_ROOT}/bin/arch-mcp",
      "args": [],
      "env": {
        "ARCH_API_KEY": "${ARCH_API_KEY}"
      }
    }
  }
}

The executable basename is arch-mcp. package.json maps that command name to bin/arch-mcp. Node.js 18 or newer is required (fetch is built in). There are no npm dependencies. bin/arch-mcp itself needs Node.js 18.19 or newer, which is when Node runs an extensionless file in a "type": "module" package.

On Windows, bin/arch-mcp is a shebang script. Windows users can still run node server/index.mjs from the plugin directory. Use that same command on Node versions older than 18.19.

Related MCP server: CodeRabbit MCP

Get an Arch API key

Arch does not publish a separate API-key page. https://arch.tnvolman.com/api-key is not a page. The key form is on the homepage: Get your API key. The API docs quick start points at that same page.

Submit your name, email, and privacy consent. The page issues a key immediately and shows it once; a copy is also emailed. Attach a card from the link on that result, or later from the developer dashboard (email magic link), before a paid review.

Configure ARCH_API_KEY

1. Get a key at arch.tnvolman.com/#access, as described above.

2. In the plugin dashboard, open Plugins → Arch → Configure.

3. Set Arch API Key (ARCH_API_KEY).

The plugin stores only the variable name. The key stays in the client configuration and is passed to the server as ARCH_API_KEY. arch_review fails closed when the key is missing. kjv_lookup never reads it.

Pricing

This plugin is free. It calls the Arch API with your own key, and Arch bills each review.

Cost

Each paid review is $2.00. Volume pricing for businesses is by agreement: api@tnvolman.com.

kjv_lookup is free.

Skills

Skills live in skills/*/SKILL.md.

A failed review is not retried, and a long text is not split into extra paid calls, unless the user agrees to another charge.

Fail closed

arch_review returns an error, and never a made-up verdict, when:

• ARCH_API_KEY is missing or empty

• Arch returns any non-2xx status

  • 401 bad API key

  • 400 bad text

  • 402 no payment method, or payment declined

  • 429 rate limit (60 requests per minute)

  • 503 upstream unavailable

• the network fails, or a 2xx body is not JSON

On an error, do not publish the content and do not invent passed, review, or suggestions.

kjv_lookup is separate. A bad reference returns an error and no verse text. It does not change arch_review.

Tool: arch_review

Request:

Success body fields: review, passed, suggestions, charge_id, billing_status, meta.

Tool: kjv_lookup

Offline lookup of the public-domain King James Version (1769). No network call, no API key, and no charge. It returns verse wording only. It does not review theology; use arch_review for that.

Success fields: reference, translation, edition, book, chapter, verse_start, verse_end, and verses (verse, text).

A reference that cannot be read, an unknown book, a missing chapter, or a missing verse returns a clear error. Ranges stay inside one chapter.

KJV text source

Bundled file: server/data/kjv.json (4,248,786 bytes). 66 books, 31,102 verses, no Apocrypha.

The text is the 1769 King James Version, which is in the public domain. It comes from farskipper/kjv json/verses-1769.json at commit 8f06584d580a767425d7d4b4c314b967e6d45ab5. That repository's LICENSE is The Unlicense, a public-domain dedication with no license restrictions, and its README says "Public Domain."

This plugin stores a compact copy of that verse text. A leading # paragraph marker was removed from verses that had one. Words the source marks as italics stay in square brackets, for example [his]. The source titles Song of Solomon as "Solomon's Song"; lookup accepts both, and the book name it returns is "Song of Solomon".

Tests

node --test

npm test runs the same command. The tests do not call Arch.

What this plugin does not do

It does not call or wrap /api/arch/review, /arch/request-access, billing setup, the dashboard, admin or internal routes, or api.arch.tnvolman.com.

kjv_lookup does not call Arch. arch_review reviews the theology of text only.

Data

Review text is sent to the Arch API for review, and Arch does not use it to train AI models. See the Privacy Policy for which services process it.

Legal

• Terms of Service

• Privacy Policy

Support

Contact api@tnvolman.com.

License

MIT. See LICENSE. The bundled King James text is public domain, as noted above.