CarrierTrail

Is CarrierTrail MCP server safe?

• No hidden instructions were found in its tool descriptions.
• Its error messages showed no secrets or internal details.
• All 3 of its tools are labeled read-only.
• Overall it scored 83/100 on 29 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

3 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
• !
  Every tool is described

  2 warnings

  • !search_carriers: Inputs with no description: limit
  • !get_recent_changes: Inputs with no description: days
  note
• !
  Bad inputs give a clean error

  3 warnings

  • !search_carriers: Accepted wrong type for "name" without complaining
  • !get_carrier: Accepted wrong type for "number" without complaining
  • !get_recent_changes: Accepted wrong type for "dot" without complaining
  • and 3 more
  note
• ✓
  ConnectsConnected in 1.1 s
  pass
• ✓
  Lists its toolsFound 3 tools
  pass
• ✓
  Tools are labeled safe or dangerousEvery tool has a safety label
  pass
• ✓
  No hidden instructionsNo hidden instructions found in tool descriptions
  pass
• ✓
  Tools work with good inputs

  All good

  • ✓search_carriers: Worked (1.1 s)
  • ✓get_carrier: Answered with an error, probably because of our sample input: { "error": "Give a USDOT, MC, FF or MX number, e.g. \"2233441\" or \"MC-123456\"." } {"error":"Give a USDOT, MC, FF or MX number, e.g. \"22…
  • ✓get_recent_changes: Answered with an error, probably because of our sample input: { "error": "Give a USDOT number." } {"error":"Give a USDOT number."}
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 1.1 s
  • ✓Listing tools took 429 ms
  • ✓Average tool answer: 733 ms
  • ✓search_carriers: Slowest tool: search_carriers (1.1 s)
  pass
• ✓
  No secrets leakedChecked 5 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.

Show this score on GitHub

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Score over time

• 29 Oct 202683

One test so far. New tests will show here.

Reviews

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