zzd: Swiss everyday data

At a glance

Runs where

On their server. What you send to it goes to them.

What you need

Nothing: it answered without a login

Tools

7 tools

Its own safety labels

7 read-only

Memory it takes

About 2,200 tokens of your AI's memory, just for its tool descriptions

Largest answer

About 10.7 KB in our test

Speed

Average answer in our test: 411 ms

Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 6 Nov 2026.

Is zzd: Swiss everyday data MCP server safe?

• None of the hidden-instruction wordings we know were found in its 7 tool descriptions.
• Its error messages showed no secrets or internal details.
• All 7 of its tools are labeled read-only.
• Overall it scored 89/100 on 6 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 this test does not check

• Its source code and packages.
• What a tool quietly does behind the scenes, such as writing a file or calling another service.
• Instructions hidden inside live tool answers. We only look for those in tool descriptions.
• Hidden instructions worded in a way our list doesn't know yet.
• Tools that could change something. Those are read, never run.

What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection

Known security advisories

It lists no public code, so there is nothing to look up in GitHub Security Advisories or OSV.dev. QAmcp tests how a server behaves. It does not scan source code.

What it can do

7 tools, in the server's own words.

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
• !
  Every tool is described

  4 warnings

  • !find_wedding_venues: Inputs with no description: town, from, to, minGuests
  • !get_wedding_venue: Inputs with no description: id
  • !rent_reference: Inputs with no description: lang
  • !ev_cost_per_km: Inputs with no description: homeElectricityChfPerKwh, publicChargingChfPerKwh, acquisitionType, make
  note
• ✓
  ConnectsConnected in 1.1 s
  pass
• ✓
  Lists its toolsFound 7 tools
  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

  • ✓search_grocery_prices: Worked (1.2 s)
  • ✓compare_grocery_prices: Answered with an error, probably because of our sample input: Schnäppchen Jäger has no product 1. Search for it first with search_grocery_prices. {"error":"not found"}
  • ✓find_wedding_venues: Worked (274 ms)
  • ✓get_wedding_venue: Answered with an error, probably because of our sample input: No venue with id "test". Find one with find_wedding_venues. {"error":"not found"}
  • ✓rent_reference: Answered with an error, probably because of our sample input: Give canton (e.g. ZH) or place (a postal code or municipality). {"error":"Give canton (e.g. ZH) or place (a postal code or municipality)."}
  • ✓ev_cost_per_km: Worked (133 ms)
  • ✓find_map_posters: Worked (557 ms)
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓search_grocery_prices: Refused missing required input "query" with a clear error
  • ✓search_grocery_prices: Refused wrong type for "query" with a clear error
  • ✓compare_grocery_prices: Refused missing required input "productId" with a clear error
  • ✓compare_grocery_prices: Refused wrong type for "productId" with a clear error
  • ✓find_wedding_venues: Refused wrong type for "canton" with a clear error
  • ✓get_wedding_venue: Refused missing required input "id" with a clear error
  • ✓get_wedding_venue: Refused wrong type for "id" with a clear error
  • ✓rent_reference: Refused wrong type for "canton" with a clear error
  • and 3 more
  pass
• ✓
  Tools work together

  2 chains working

  • ✓find_wedding_venues → get_wedding_venue: get_wedding_venue found what find_wedding_venues returned (id = "gr_moesa_mesocco_al_castello_di_mesocco")
  • ✓search_grocery_prices → compare_grocery_prices: compare_grocery_prices found what search_grocery_prices returned (productId = "147045")
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 1.1 s
  • ✓Listing tools took 135 ms
  • ✓Average tool answer: 411 ms
  • ✓search_grocery_prices: Slowest tool: search_grocery_prices (1.2 s)
  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

Test it yourself

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Show this score on GitHub

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Score over time

• 6 Nov 202689

One test so far. New tests will show here.

Reviews

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