FareDice

Is FareDice 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 6 of its tools are labeled read-only.
• Overall it scored 95/100 on 31 Oct 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

6 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 (2025-06-18). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
  note
• ✓
  ConnectsConnected in 613 ms
  pass
• ✓
  Lists its toolsFound 6 tools
  pass
• ✓
  Every tool is describedAll 6 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

  • ✓find_trips: Answered with an error, probably because of our sample input: {"error":"from is needed: a start city's name or IATA code, or \"anywhere\" (or home, for a home airport outside the region)."}
  • ✓get_trip: Answered with an error, probably because of our sample input: {"error":"link is a FareDice trip link, as find_trips returns it: https://faredice.com/trip?l=..."}
  • ✓swap_stop: Answered with an error, probably because of our sample input: {"error":"link is a FareDice trip link, as find_trips returns it: https://faredice.com/trip?l=..."}
  • ✓nonstop_fares: Answered with an error, probably because of our sample input: {"error":"FareDice has no flights for “test” and “test” together in Europe or Southeast Asia: give a city of the region by name or IATA cit…
  • ✓nonstop_from: Answered with an error, probably because of our sample input: {"error":"FareDice has no flights for “test” together in Europe or Southeast Asia: give a city of the region by name or IATA city code, or …
  • –edit_trip: Not run: labeled read-only, but its name starts with "edit", which usually means it changes something. Skipped to be safe: if it only reads, a clearer name helps AI apps too, or test again with --owner
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓find_trips: Refused wrong type for "region" with a clear error
  • ✓get_trip: Refused missing required input "link" with a clear error
  • ✓get_trip: Refused wrong type for "link" with a clear error
  • ✓swap_stop: Refused missing required input "link" with a clear error
  • ✓swap_stop: Refused wrong type for "link" with a clear error
  • ✓nonstop_fares: Refused missing required input "from" with a clear error
  • ✓nonstop_fares: Refused wrong type for "from" with a clear error
  • ✓nonstop_from: Refused missing required input "from" with a clear error
  • and 1 more
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 613 ms
  • ✓Listing tools took 121 ms
  • ✓Average tool answer: 347 ms
  • ✓get_trip: Slowest tool: get_trip (476 ms)
  pass
• ✓
  No secrets leakedChecked 14 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 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.

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.

Score over time

• 31 Oct 202695

One test so far. New tests will show here.

Reviews

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