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Acorn Harness MCP Server

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Acorn Harness is listed as active in the registry but did not answer our last check. It exposes 4 tools. Last commit 3 Nov 2026.

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

Uptime history 5 days of history · worst day 0%
5 days agonow
16.5%
Uptime 24h
15 of 91 checks
4
Tools
read from the server
296 ms
Response time
average over 24h
0
Stars
last commit 3 Nov 2026

What changed 4

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 7 November 2026. No other catalogue keeps this.

7 Nov 2 tool descriptions were rewritten create_order, quote_harness
7 Nov 2 tools changed the parameters they ask for create_order, quote_harness

Acorn Harness does not always answer

Over the last week it answered 21.8% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 min ago.

run in your terminal
claude mcp add acorn --transport http https://acornharness.com/mcp
Settings → Connectors → Add custom connector, then paste this address
https://acornharness.com/mcp
~/.codex/config.toml
[mcp_servers.acorn]
url = "https://acornharness.com/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "acorn": {
      "url": "https://acornharness.com/mcp"
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "acorn": {
      "type": "http",
      "url": "https://acornharness.com/mcp"
    }
  }
}

Available tools 4

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

order
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 countries have one service, International Tracked); nothing is charged or built until they pay there, and the link expires after 24 hours. Quote first with quote_harness and confirm the design, quantity and price with the user before calling this. Never ask for or accept card numbers or other payment details in the conversation. Items take the same fields as quote_harness and must be just as complete: pass back each quoted item's config (or design) once the user has confirmed it, and the same ship_to.
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 is emailed to the buyer), plus the charged totals. Never returns addresses or contact details.
options
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 signal pair, JST GH end B), the rules for combining them, required_choices (with the question to ask the user for each), optional_choices and their defaults, pricing rules, lead time, shipping and returns. Call it when you need the allowed values; it takes no arguments and changes nothing.
quote
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 defaults_applied. Every item needs connector, length_mm, power_gauge, end_a, end_b, quantity, or a complete design code / configurator URL in design. Items missing any of them are refused with the questions to ask: ask the user, don't guess, and ask about end A and end B separately. Colors, twisting, crossing and end_b_gh have defaults, listed in defaults_applied for you to tell the user. Volume discounts count every harness across all items. Also returns the shipping options and prices to ship_to (the US if omitted; ask the user where it ships). Prices exclude shipping (chosen at checkout from those options) and sales tax; outside the US the buyer pays import duties and taxes on delivery. Nothing is ordered or saved.

Endpoints

URLTransportStateLatencyChecked
https://acornharness.com/mcp streamable-http answering 121 ms 14 min ago

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Acorn Harness — questions

Answers built from our own checks of this server.

What can Acorn Harness do?
It exposes 4 tools, read directly from the server on our last check. Among them: create_order, get_order_status, list_options, quote_harness. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is Acorn Harness working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 15 of 91 checks got a reply (16.5%), average response time 296 ms. The bar chart above shows every period we have measured.
The registry lists Acorn Harness as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect Acorn Harness?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does Acorn Harness need an API key?
No. Acorn Harness completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 4 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is Acorn Harness?
It answers our handshake in 296 ms on average, which is faster than 47% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is Acorn Harness open source?
The code is open source: it is published under the MIT licence and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at acornharness.com, which runs on its operator's own terms.