HomeCalc — Canadian Mortgage & Tax Calculators

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

34 tools

Its own safety labels

34 read-only

Memory it takes

About 15,800 tokens of your AI's memory, just for its tool descriptions

Largest answer

About 4.7 KB in our test

Speed

Average answer in our test: 234 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, 3 Nov 2026.

Is HomeCalc — Canadian Mortgage & Tax Calculators MCP server safe?

• None of the hidden-instruction wordings we know were found in its 34 tool descriptions.
• Its error messages showed no secrets or internal details.
• All 34 of its tools are labeled read-only.
• Overall it scored 100/100 on 3 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

34 tools, in the server's own words.

and 10 more

Test results

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

• !
  Follows MCP best practices (not scored yet)

  1 tip (not scored)

  • !The tool list is about 65 KB (roughly 16k tokens). AI apps send it with every message, so it takes that much of the AI's memory before any work starts.
  note
• ✓
  ConnectsConnected in 426 ms
  pass
• ✓
  Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
  pass
• ✓
  Lists its toolsFound 34 tools
  pass
• ✓
  Every tool is describedAll 34 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

  • ✓mortgage_payment: Answered with an error, probably because of our sample input: { "error": "Missing input: pass homePrice (with downPayment) if the user gave a purchase price, or loanAmount if they gave a mortgage amoun…
  • ✓minimum_down_payment: Worked (389 ms)
  • ✓income_tax: Worked (324 ms)
  • ✓mortgage_penalty: Worked (272 ms)
  • ✓bc_home_flipping_tax: Worked (227 ms)
  • ✓rent_increase: Worked (227 ms)
  • ✓capital_gains_tax: Worked (234 ms)
  • ✓heloc_second_mortgage: Worked (229 ms)
  • and 26 more
  pass
• ✓
  Bad inputs give a clean error

  All good

  • ✓mortgage_payment: Refused missing required input "annualInterestRatePct" with a clear error
  • ✓mortgage_payment: Refused wrong type for "annualInterestRatePct" with a clear error
  • ✓minimum_down_payment: Refused missing required input "homePrice" with a clear error
  • ✓minimum_down_payment: Refused wrong type for "homePrice" with a clear error
  • ✓income_tax: Refused missing required input "annualIncome" with a clear error
  • ✓income_tax: Refused wrong type for "annualIncome" with a clear error
  • ✓mortgage_penalty: Refused missing required input "balance" with a clear error
  • ✓mortgage_penalty: Refused wrong type for "balance" with a clear error
  • and 32 more
  pass
• ✓
  Fast enough

  All good

  • ✓Connecting took 426 ms
  • ✓Listing tools took 344 ms
  • ✓Average tool answer: 234 ms
  • ✓mortgage_payment: Slowest tool: mortgage_payment (752 ms)
  pass
• ✓
  No secrets leakedChecked 76 error messages: no secrets or internal details
  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

• 3 Nov 2026100

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use HomeCalc — Canadian Mortgage & Tax Calculators, signed in with GitHub, one per person. Reviews never change the score.