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Directory / Meridian

Meridian

Q: Is Meridian 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 4 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 meridian.clawhard.com · https://meridian.clawhard.com/mcp

Convert times between zones with daylight saving right, see who is awake, find meeting slots.

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

Visit website

95 /100

PASS · WITH NOTES

12 of 12 checks · 2 Nov 2026

Is Meridian 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 4 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

4 tools, in the server's own words.

meridian_nowread-only

Use whenever you need to know what time or date it is right now somewhere.

meridian_convert_timeread-only

Use to convert a specific wall-clock time from one place to others, for any date.

meridian_meeting_slotsread-only

Use to schedule a call across several places.

meridian_zone_inforead-only

Use to answer "what is the UTC offset of X", "does X observe daylight saving" and "when do the clocks change".

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 157 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
- ✓meridian_now: Answered with an error, probably because of our sample input: Could not find a time zone for "test". Use a city like "Tokyo", an IANA zone like "Asia/Tokyo", an abbreviation like "PST", or "UTC+5:30".
- ✓meridian_convert_time: Answered with an error, probably because of our sample input: Could not find a time zone for "test" (from). Use a city like "Tokyo", an IANA zone like "Asia/Tokyo", an abbreviation like "PST", or "UTC+…
- ✓meridian_meeting_slots: Answered with an error, probably because of our sample input: Invalid argument "places": needs at least 2 item(s).
- ✓meridian_zone_info: Answered with an error, probably because of our sample input: Could not find a time zone for "test". Use a city like "Tokyo", an IANA zone like "Asia/Tokyo", an abbreviation like "PST", or "UTC+5:30".
pass
✓
Bad inputs give a clean error
All good
- ✓meridian_now: Refused missing required input "places" with a clear error
- ✓meridian_now: Refused wrong type for "places" with a clear error
- ✓meridian_convert_time: Refused missing required input "time" with a clear error
- ✓meridian_convert_time: Refused wrong type for "time" with a clear error
- ✓meridian_meeting_slots: Refused missing required input "places" with a clear error
- ✓meridian_meeting_slots: Refused wrong type for "places" with a clear error
- ✓meridian_zone_info: Refused missing required input "place" with a clear error
- ✓meridian_zone_info: Refused wrong type for "place" with a clear error
pass
✓
Fast enough
All good
- ✓Connecting took 157 ms
- ✓Listing tools took 21 ms
- ✓Average tool answer: 29 ms
- ✓meridian_meeting_slots: Slowest tool: meridian_meeting_slots (43 ms)
pass
✓
No secrets leakedChecked 12 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 (6 resources, 1 prompt)
- ✓Opened 6 of 6 resources
- ✓An address that does not exist gets a clean "not found" error
- ✓Opened 1 of 1 prompts
pass
–
Tools work togetherNo safe tool returned data to start a chain from, so chains were not tested (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://meridian.clawhard.com/mcp

Show this score on GitHub

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

Score over time

2 Nov 202695

One test so far. New tests will show here.

Reviews

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

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