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Directory / Holos33

Holos33

Q: Is Holos33 MCP server safe?

QAmcp's test on 2 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. All 11 of its tools are labeled read-only. Overall it scored 95/100 on 2 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 holos33.com · https://mcp.holos33.com/mcp

Read-only facts on Holos33, an EU privacy-first wellbeing platform: modules, Early Access, privacy.

11 tools✓ all read-only✓ no account neededPricing: not listed

Visit website

95 /100

PASS · WITH NOTES

12 of 12 checks · 2 Nov 2026

Is Holos33 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.
All 11 of its tools are labeled read-only.
Overall it scored 95/100 on 2 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

11 tools, in the server's own words.

get_overviewread-only

What Holos33 is, its launch status, who it is for and not for, the company behind it, the six modules and the official links.

list_modulesread-only

The six wellbeing modules (stress, sleep, breathing, hypnosis, nutrition, movement) with a one-line summary and URL.

get_moduleread-only

Full text of one module as Markdown, with related knowledge-base articles.

search_contentread-only

Keyword search across Holos33 knowledge-base articles, modules, site pages and FAQ.

get_articleread-only

Full text of one knowledge-base article as Markdown, with publication date, categories and the translated version's URL.

get_pageread-only

Full text of one holos33.com page as Markdown, including legal and privacy pages.

get_faqread-only

Frequently asked questions and answers.

get_access_and_pricingread-only

Current price (free Early Access), fair-use limits, who can join, supported wearables, what happens after Early Access, and the waitlist link.

get_privacy_and_dataread-only

Where data is stored, how health-related data is handled under the GDPR, who the controller is, and links to the privacy policy and sub-processor register.

get_partner_inforead-only

What Holos33 offers coaches and therapists, organisations, research partners or investors, and where to take the next step (demo, partner interest).

get_contact_and_linksread-only

Company details and official links: waitlist, business demo, partner interest, contact form, FAQ and legal pages.

Test results

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

!
Resources and prompts work
5 warnings (4 templates, 1 prompt)
- !holos33://facts/{lang}: A made-up value (holos33://facts/qamcp-test) gets an internal error instead of a clean "not found": Error reading resource 'holos33://facts/qamcp-test'
- !holos33://page/{lang}/{key}: A made-up value (holos33://page/qamcp-test/qamcp-test) gets an internal error instead of a clean "not found": Error reading resource 'holos33://page/qamcp-test/qamcp-test'
- !holos33://module/{lang}/{key}: A made-up value (holos33://module/qamcp-test/qamcp-test) gets an internal error instead of a clean "not found": Error reading resource 'holos33://module/qamcp-test/qamcp-test'
- !holos33://article/{lang}/{key}: A made-up value (holos33://article/qamcp-test/qamcp-test) gets an internal error instead of a clean "not found": Error reading resource 'holos33://article/qamcp-test/qamcp-test'
- !explain_holos33: Our sample inputs get an internal error instead of an "invalid input" error: Error rendering prompt 'explain_holos33': audience moet individual, professional of business zijn; lang nl of en
- and 1 more
note
✓
ConnectsConnected in 514 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 11 tools
pass
✓
Every tool is describedAll 11 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
- ✓get_overview: Worked (206 ms)
- ✓list_modules: Worked (162 ms)
- ✓get_module: Answered with an error, probably because of our sample input: Onbekende module 'test'. Geldige keys: breathing-relaxation, hypnosis-mindset, movement-vitality, nutrition-rhythm, sleep-recovery, stress-…
- ✓search_content: Worked (191 ms)
- ✓get_article: Answered with an error, probably because of our sample input: Onbekend artikel 'test' in taal en. Gebruik search_content om de key te vinden.
- ✓get_page: Answered with an error, probably because of our sample input: Onbekende pagina 'test'. Geldige keys: ai-coach, biofeedback, contact, cookie-policy, data-management, disclaimer, early-access-terms, faq,…
- ✓get_faq: Worked (150 ms)
- ✓get_access_and_pricing: Worked (158 ms)
- and 3 more
pass
✓
Bad inputs give a clean error
All good
- ✓get_overview: Refused wrong type for "lang" with a clear error
- ✓list_modules: Refused wrong type for "lang" with a clear error
- ✓get_module: Refused missing required input "module" with a clear error
- ✓get_module: Refused wrong type for "module" with a clear error
- ✓search_content: Refused missing required input "query" with a clear error
- ✓search_content: Refused wrong type for "query" with a clear error
- ✓get_article: Refused missing required input "article" with a clear error
- ✓get_article: Refused wrong type for "article" with a clear error
- and 8 more
pass
✓
Fast enough
All good
- ✓Connecting took 514 ms
- ✓Listing tools took 306 ms
- ✓Average tool answer: 170 ms
- ✓get_overview: Slowest tool: get_overview (206 ms)
pass
✓
No secrets leakedChecked 19 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
–
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://mcp.holos33.com/mcp

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Score over time

2 Nov 202695

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Holos33, signed in with GitHub, one per person. Reviews never change the score.

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