Compound Mint Money Calculator

Is Compound Mint Money Calculator 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 12 of its tools are labeled read-only.
• Overall it scored 92/100 on 1 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

12 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
• !
  Bad inputs give a clean error

  4 warnings

  • !answer_money_question: Accepted missing required input "question" without complaining
  • !answer_money_question: Accepted wrong type for "question" without complaining
  • !search: Accepted missing required input "query" without complaining
  • !search: Accepted wrong type for "query" without complaining
  • and 15 more
  note
• !
  Follows MCP best practices (not scored yet)

  1 tip (not scored)

  • !Very common tool names: search, fetch. Next to other servers' tools the AI may mix them up; a short prefix helps (like "github_search" instead of "search").
  note
• ✓
  ConnectsConnected in 848 ms
  pass
• ✓
  Lists its toolsFound 12 tools
  pass
• ✓
  Every tool is describedAll 12 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

  • ✓answer_money_question: Worked (167 ms)
  • ✓calculate_compound_interest: Answered with an error, probably because of our sample input: {"error":"missing_param","message":"Send a principal (starting amount), a monthly_contribution, or both. Both were 0 or missing.","param":"…
  • ✓rule_of_72: Answered with an error, probably because of our sample input: {"error":"missing_param","message":"Send annual_rate (to get years to double) or years (to get the rate needed to double in that time).","p…
  • ✓calculate_coast_fire: Answered with an error, probably because of our sample input: {"error":"bad_request","message":"current_age must be from 14 to 99 (your age now). Got 1.","param":"current_age","got":"1","valid":"a numb…
  • ✓calculate_fire_number: Answered with an error, probably because of our sample input: {"error":"missing_param","message":"Send annual_spending (yearly spending in retirement, today's dollars) or fire_number (the total you nee…
  • ✓calculate_holiday_budget: Worked (177 ms)
  • ✓calculate_401k_match: Answered with an error, probably because of our sample input: {"error":"bad_request","message":"salary must be from 1000 to 10000000 (yearly pay in USD). Got 1.","param":"salary","got":"1","valid":"a n…
  • ✓calculate_debt_payoff: Answered with an error, probably because of our sample input: {"error":"missing_param","message":"balance is required (what you owe in USD).","param":"balance","required":[],"docs":"https://compoundmin…
  • and 4 more
  pass
• ✓
  Tools work together

  3 chains working

  • ✓search → fetch: fetch found what search returned (id = "296")
  • ✓calculate_holiday_budget → fetch: fetch found what calculate_holiday_budget returned (id = "https://compoundmint.com/how-much-to-spend-on-christmas-gif…")
  • ✓calculate_savings_goal → fetch: fetch found what calculate_savings_goal returned (id = "https://compoundmint.com/how-compound-interest-works/")
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 848 ms
  • ✓Listing tools took 180 ms
  • ✓Average tool answer: 176 ms
  • ✓search: Slowest tool: search (222 ms)
  pass
• ✓
  No secrets leakedChecked 26 error messages: no secrets or internal details
  pass
• ✓
  Resources and prompts work

  All good (9 resources, 1 template, 5 prompts)

  • ✓Opened 9 of 9 resources
  • ✓compoundmint://calculator/{slug}: A made-up value gets a clean error (compoundmint://calculator/qamcp-test)
  • ✓An address that does not exist gets a clean "not found" error
  • ✓Opened 5 of 5 prompts
  pass

Test it yourself

Free and open source. Same checks, same score.

Show this score on GitHub

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Score over time

• 1 Nov 202692

One test so far. New tests will show here.

Reviews

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