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PopNx MCPMCP servers for people who use AI · explained in plain words

Acorn Harness

by almond-botversion 1.0.0i★ –iRuns in the cloud
Registry namecom.acornharness/acorn

Install

Overview

Description from the maker (original English)

Configure, price and order custom XT30, XT30(2+2) and XT30 + JST GH wire harnesses.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Install

Pick the AI app you use, then copy the settings.

Before you install

You need

Which app do you use?

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

  1. Open Settings → Connectors
  2. Press Add custom connector
  3. Paste the address below and press Add
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Add2https://…3
https://acornharness.com/mcp

Run this in your terminal

claude mcp add --transport http acorn https://acornharness.com/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "acorn": {
      "url": "https://acornharness.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "acorn": {
      "type": "http",
      "url": "https://acornharness.com/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

  1. Open ChatGPT on the web → Settings → Connectors (Apps)
  2. Press Create or Add (some plans need Developer mode under Advanced first)
  3. Paste the address below, give it a name and save
  4. If it asks you to sign in, sign in with the maker
SettingsConnectors1+ Create2https://…3
https://acornharness.com/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 6, 2026. The maker wrote them, not us; we show them as plain text.

  • list_options

    List every option for an Acorn Harness custom wire harness: connector types (XT30, XT30(2+2), XT30 + JST GH), wire length range, power gauges, end A and end B terminations (straight, right angle up/down, unterminated tinned leads on end B), wire colors, extras (twisted or crossed

  • quote_harness

    Price one or more custom wire harness designs exactly as acornharness.com checkout will. Returns, for each design, a picture (side view plus both ends' rear views, as the configurator draws it: show it to the user), a configurator_url that opens the design on the site, and defaul

  • create_order

    Create an unpaid order for one or more wire harness designs and get a checkout_url on acornharness.com for the buyer. The buyer opens it to pay (card, Link or wallet, via Stripe) and enter the shipping address (in the ship_to country) and, in the US, the shipping speed (other cou

  • get_order_status

    Check an order by the id create_order returned (starts with cs_). Returns status: awaiting_payment (checkout_url still valid), payment_processing (a bank payment settling), payment_failed or expired (create a new order), or paid (built and shipped within 5 business days; tracking

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026

  • ! Caution

    Maker matches the repo

    The publisher (acornharness.com) is not the repo owner (almond-bot); someone else may have listed it

  • … Not checked yet

    Still maintained

    We have not read this repo from GitHub yet

  • … Not checked yet

    Has a licence

    We have not read this repo from GitHub yet

  • ✓ Pass

    Endpoint responds

    Responded in 335 ms (HTTP 200)

  • – Not applicable

    Sign-in with OAuth

    No sign-in needed

  • ✓ Pass

    No hidden instructions in tool descriptions

    Read 4 tool descriptions and found no hidden instructions to the AI

Compared with others in Otheri

  • More stars than 0% of the other 18627 servers in this category
  • Published to the registry more recently than 87% of the other 18627 servers in this category
  • Basic checks equal to or better than 36% of the other 18627 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is Acorn Harness safe?

It passed 2 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 5 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: Spec Driven Development, Remote Desktop Commander, Bestax

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

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by allxsmithGrowing↓ 2.9K/wkUpdated today

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README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

acorn-plugins

Acorn Harness plugins for Claude Code, Codex and ChatGPT: order custom XT30 wire harnesses from AI assistants.

Acorn Harness builds custom XT30, XT30(2+2) and XT30 + JST GH wire harnesses to order, for robots, actuators, batteries and power boards. Describe the cable you need and your assistant turns it into a design, quotes the exact price, and gives you a checkout link on acornharness.com. You pay and enter the shipping address there, never in the chat. Every wire harness is Assembled in the USA, 100% continuity tested, and ships within 5 business days (US only).

All of these connect to the same remote MCP server: https://acornharness.com/mcp (Streamable HTTP, no authentication).

Claude Code

Inside Claude Code:

/plugin marketplace add almond-bot/acorn-plugins

/plugin install acorn@acorn-plugins

Or from a shell:

claude plugin marketplace add almond-bot/acorn-plugins

claude plugin install acorn@acorn-plugins

Run /mcp to confirm plugin:acorn:acorn is connected. The plugin adds the MCP server and an order-wire-harnesses skill. To add only the MCP server:

claude mcp add --transport http acorn https://acornharness.com/mcp

Codex

codex mcp add acorn --url https://acornharness.com/mcp

Or add this to ~/.codex/config.toml (or a trusted project's .codex/config.toml):

[mcp_servers.acorn]

url = "https://acornharness.com/mcp"

See codex/ for more.

ChatGPT

  1. Open chatgpt.com/plugins and click +.
  2. Choose Add custom MCP server.
  3. Enter the URL https://acornharness.com/mcp and pick no authentication.
  4. Click Create as a plugin.

The plugin package for the OpenAI plugin directory is in chatgpt/.

Claude.ai

Custom connectors need a paid Claude plan.

  1. Go to Customize → Connectors → Add → Custom → Web.
  2. Enter the URL https://acornharness.com/mcp.
  3. Choose No sign-in and save.

Try it

Quote 10 XT30(2+2) wire harnesses, 350 mm, 16 AWG, end A straight and end B right angle down.

I need 4 XT30 pigtails, 200 mm of 18 AWG with tinned leads. Send me a checkout link.

Make a 600 mm XT30(2+2) to JST GH CAN cable with the signal pair crossed and order 2.

Repository layout

PathWhat it is
.claude-plugin/marketplace.jsonClaude Code marketplace acorn-plugins, listing the acorn plugin.
plugins/acorn/Claude Code plugin: manifest, icon, .mcp.json and the ordering skill.
codex/Codex config.toml snippet and setup notes.
chatgpt/Agent Plugins package for ChatGPT and the OpenAI plugin directory.
server.jsonOfficial MCP Registry entry (com.acornharness/acorn).

Full setup guide for every assistant: https://acornharness.com/developers#ai

API docs: https://acornharness.com/developers#api

Privacy and terms

Questions: support@almond.bot

License

MIT

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