Acorn Harness
REMOTE · ACORNHARNESS.COM
Configure, price and order custom XT30, XT30(2+2) and XT30 + JST GH wire harnesses.
Available components
Last scanned (3 hours ago)
Scores higher than 64% of remote servers
Reachable. Last reached 5 Nov 2026.
Category E-commerce
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability76
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 1179 tokens (~196/item across 6 items; 4 tools + 2 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management7
- Stability observed for 2 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
- Structured output schemas are declared (75% of tools); any adoption earns full credit.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
- Supports UI / widget rendering.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 4 Nov 26 0
- Stability: unverified → 0.03 ▲ functional
- 3 Nov 26 74
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://acornharness.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.acornharness.com | CN=YR2,O=Let's Encrypt,C=US | 26 Oct 2026 | 24 Jan 2027 | RSA 2048 | SHA256-RSA | 5a92b460a6a14ffbe856225fcf059d96a8b |
| SANs: *.acornharness.com, acornharness.com | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of acornharness.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| acornharness.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://acornharness.com/mcp | Verified | 200 | |
| http (plaintext) | http://acornharness.com/mcp | HTTPS enforced | 308 | https://acornharness.com/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
create_order Create a wire harness order ~252
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 US shipping address and shipping speed; 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.
| Name | Type | Req | Description |
|---|---|---|---|
| string | – | Buyer's email, only if they gave it: prefills checkout; the receipt, invoice and tracking go there. | |
| idempotency_key | string | – | Any unique string. Retrying with the same key and the same items returns the same order instead of a second one. |
| items | array | yes | 1–40 wire harness designs. Volume discounts count every harness across all items. |
| reference | string | – | Buyer's PO number or note, echoed back on the order. |
| Name | Type | Req | Description |
|---|---|---|---|
| checkout_url | string | yes | Where the buyer pays, on acornharness.com |
| currency | string | yes | – |
| excludes | string | yes | – |
| expires_at | string | yes | checkout_url stops working after this time (ISO 8601) |
| harnesses | number | yes | Total harnesses across all items |
| id | string | yes | Order id; pass to get_order_status |
| items | array | yes | – |
| lead_time_business_days | number | yes | – |
| next_volume_break | – | yes | – |
| reference | string|null | yes | – |
| shipping_options | array | yes | – |
| ships_to | string | yes | – |
| status | string | yes | – |
| subtotal | number | yes | USD |
| volume_discount | number | yes | Fraction off every item, e.g. 0.1 |
No examples provided.
get_order_status Get wire harness order status ~108
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.
| Name | Type | Req | Description |
|---|---|---|---|
| order_id | string | yes | The order id from create_order, e.g. cs_live_a1B2… |
| Name | Type | Req | Description |
|---|---|---|---|
| checkout_url | string | – | Only while awaiting_payment |
| created | string | yes | – |
| currency | string | yes | – |
| discount | number | yes | USD |
| expires_at | string | – | – |
| fulfillment | string|null | yes | – |
| harnesses | number | yes | – |
| id | string | yes | – |
| items | array | yes | – |
| reference | string|null | yes | – |
| shipping | – | yes | – |
| status | string | yes | – |
| subtotal | number | yes | USD |
| tax | number | yes | USD |
| total | number | yes | USD |
No examples provided.
list_options List wire harness options ~140
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
quote_harness Quote wire harnesses ~212
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. Prices exclude shipping (chosen at checkout) and sales tax. Nothing is ordered or saved.
| Name | Type | Req | Description |
|---|---|---|---|
| items | array | yes | 1–40 wire harness designs. Volume discounts count every harness across all items. |
| Name | Type | Req | Description |
|---|---|---|---|
| currency | string | yes | – |
| excludes | string | yes | – |
| harnesses | number | yes | Total harnesses across all items |
| items | array | yes | – |
| lead_time_business_days | number | yes | – |
| next_volume_break | – | yes | – |
| shipping_options | array | yes | – |
| ships_to | string | yes | – |
| subtotal | number | yes | USD |
| volume_discount | number | yes | Fraction off every item, e.g. 0.1 |
No examples provided.
How do I install the Acorn Harness MCP server?
Acorn Harness is a hosted endpoint at https://acornharness.com/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · acornharness.com
claude mcp add --transport http com-acornharness-acorn 'https://acornharness.com/mcp'
What is the Acorn Harness MCP server?
Acorn Harness is an MCP server listed in the public MCP registry as com.acornharness/acorn. Configure, price and order custom XT30, XT30(2+2) and XT30 + JST GH wire harnesses. This page covers its hosted endpoint (https://acornharness.com/mcp).
Is the Acorn Harness MCP server safe to use?
Acorn Harness scores 75 out of 100 on VerifyMCP. 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 Acorn Harness MCP server expose?
Acorn Harness exposes 4 tools: list_options, quote_harness, create_order, get_order_status. Their descriptions and schemas cost roughly 712 tokens of context every time the server is loaded.
Does the Acorn Harness MCP server require authentication?
No. We connected to Acorn Harness without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the Acorn Harness MCP server still maintained?
Acorn Harness 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.