Machine Relations Index

Is Machine Relations Index MCP server safe?

• No hidden instructions 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 90/100 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

6 tools, in the server's own words.

Test results

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

• !
  Every tool is described

  2 warnings

  • !mri_get_cited_sources: Inputs with no description: limit, offset
  • !mri_get_engine: Inputs with no description: limit, offset
  note
• !
  Fast enough

  1 warning

  • !mri_list_categories: Slowest tool: mri_list_categories (2.1 s): users will notice the wait
  • and 3 more
  note
• ✓
  ConnectsConnected in 181 ms
  pass
• ✓
  Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
  pass
• ✓
  Lists its toolsFound 6 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

  • ✓mri_list_categories: Worked (2.1 s)
  • ✓mri_get_category: Answered with an error, probably because of our sample input: {"error":{"code":"unknown_category","message":"\"test\" is not an MRI category.","hint":"Use one of the category keys below, or call mri_li…
  • ✓mri_get_cited_sources: Answered with an error, probably because of our sample input: {"error":{"code":"unknown_category","message":"\"test\" is not an MRI category.","hint":"Use one of the category keys below, or call mri_li…
  • ✓mri_get_domain: Answered with an error, probably because of our sample input: {"error":{"code":"invalid_domain","message":"Pass a domain such as techcrunch.com or a URL on it."}} {"error":{"code":"invalid_domain","mes…
  • ✓mri_list_engines: Worked (1.4 s)
  • ✓mri_get_engine: Answered with an error, probably because of our sample input: {"error":{"code":"unknown_engine","message":"\"test\" is not an answer engine in this release.","hint":"Use one of the engine keys below, o…
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓mri_get_category: Refused missing required input "category" with a clear error
  • ✓mri_get_category: Refused wrong type for "category" with a clear error
  • ✓mri_get_cited_sources: Refused missing required input "category" with a clear error
  • ✓mri_get_cited_sources: Refused wrong type for "category" with a clear error
  • ✓mri_get_domain: Refused missing required input "domain" with a clear error
  • ✓mri_get_domain: Refused wrong type for "domain" with a clear error
  • ✓mri_get_engine: Refused missing required input "engine" with a clear error
  • ✓mri_get_engine: Refused wrong type for "engine" with a clear error
  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
• –
  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

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

Score over time

• 29 Oct 202690

One test so far. New tests will show here.

Reviews

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