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Directory / Acorn Harness

Acorn Harness

Q: Is Acorn Harness MCP server safe?

QAmcp's test on 3 Nov 2026: None of the hidden-instruction wordings we know were found in its tool descriptions. Its error messages showed no secrets or internal details. 3 of its 4 tools are labeled read-only; the others may change or send things. Overall it scored 95/100 on 3 Nov 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by acornharness.com · https://acornharness.com/mcp

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

4 tools✓ no account neededPricing: not listed

Visit website

95 /100

PASS · WITH NOTES

12 of 12 checks · 3 Nov 2026

Is Acorn Harness MCP server safe?

None of the hidden-instruction wordings we know were found in its tool descriptions.
Its error messages showed no secrets or internal details.
3 of its 4 tools are labeled read-only; the others may change or send things.
Overall it scored 95/100 on 3 Nov 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What it can do

4 tools, in the server's own words.

list_optionsread-only

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 …

quote_harnessread-only

Price one or more custom wire harness designs exactly as acornharness.com checkout will.

create_order

Create an unpaid order for one or more wire harness designs and get a checkout_url on acornharness.com for the buyer.

get_order_statusread-only

Check an order by the id create_order returned (starts with cs_).

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
✓
ConnectsConnected in 463 ms
pass
✓
Lists its toolsFound 4 tools
pass
✓
Every tool is describedAll 4 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
pass
✓
Tools work with good inputs
All good
- ✓list_options: Worked (89 ms)
- ✓quote_harness: Answered with an error, probably because of our sample input: The design isn't complete yet, so nothing was priced. The acornharness.com configurator makes each of these choices, and the user hasn't ma…
- ✓get_order_status: Answered with an error, probably because of our sample input: MCP error -32602: Input validation error: Invalid arguments for tool get_order_status: Invalid string: must match pattern /^cs_(test|live)_…
- –create_order: Not run: labeled as changing data
pass
✓
Bad inputs give a clean error
All good
- ✓quote_harness: Refused missing required input "items" with a clear error
- ✓quote_harness: Refused wrong type for "items" with a clear error
- ✓get_order_status: Refused missing required input "order_id" with a clear error
- ✓get_order_status: Refused wrong type for "order_id" with a clear error
pass
✓
Fast enough
All good
- ✓Connecting took 463 ms
- ✓Listing tools took 60 ms
- ✓Average tool answer: 74 ms
- ✓list_options: Slowest tool: list_options (89 ms)
pass
✓
No secrets leakedChecked 8 error messages: no secrets or internal details
pass
✓
Follows MCP best practices (not scored yet)Tool names, safety labels and tool list size follow the MCP guide
pass
✓
Resources and prompts work
All good (2 resources)
- ✓Opened 2 of 2 resources
- ✓An address that does not exist gets a clean "not found" error
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://acornharness.com/mcp

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/com-acornharness-acorn.svg)](https://qamcp.dev/s/com-acornharness-acorn.html)

Score over time

3 Nov 202695

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Acorn Harness, signed in with GitHub, one per person. Reviews never change the score.

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