Spec Driven Development
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
Description from the maker (original English)
Configure, price and order custom XT30, XT30(2+2) and XT30 + JST GH wire harnesses.
These three are never merged into one score: opinions, measurements and popularity are different things.
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
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Works in Claude on the web, desktop and mobile:
https://acornharness.com/mcpRun this in your terminal
claude mcp add --transport http acorn https://acornharness.com/mcpPaste 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.
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:
https://acornharness.com/mcpMenu 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.
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_optionsList 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_harnessPrice 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_orderCreate 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_statusCheck 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
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
The publisher (acornharness.com) is not the repo owner (almond-bot); someone else may have listed it
We have not read this repo from GitHub yet
We have not read this repo from GitHub yet
Responded in 335 ms (HTTP 200)
No sign-in needed
Read 4 tool descriptions and found no hidden instructions to the AI
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
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.
The registry does not list a required key, though some servers ask you to sign in on first use.
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.
The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 5 days ago.
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.
In the same category: Spec Driven Development, Remote Desktop Commander, Bestax
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
MCP Server that facilitates spec-driven development workflows, not just Vibe Coding.
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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 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).
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 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.
https://acornharness.com/mcp and pick no authentication.The plugin package for the OpenAI plugin directory is in chatgpt/.
Custom connectors need a paid Claude plan.
https://acornharness.com/mcp.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.
| Path | What it is |
|---|---|
.claude-plugin/marketplace.json | Claude 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.json | Official MCP Registry entry (com.acornharness/acorn). |
Full setup guide for every assistant: https://acornharness.com/developers#ai
API docs: https://acornharness.com/developers#api
Questions: support@almond.bot
MIT