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Directory / compoundsim

compoundsim

Q: Is compoundsim MCP server safe?

QAmcp's test on 1 Nov 2026: None of the hidden-instruction wordings we know were found in its tool descriptions. Its error messages showed no secrets or internal details. All 5 of its tools are labeled read-only. Overall it scored 100/100 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.

by compoundsim.app · https://compoundsim.app/mcp

Compound interest and Monte Carlo simulators for investing, retirement and past asset returns.

5 tools✓ all read-only✓ no account neededPricing: not listed

Visit website

100 /100

PASS

11 of 11 checks · 1 Nov 2026

Is compoundsim 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 5 of its tools are labeled read-only.
Overall it scored 100/100 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

5 tools, in the server's own words.

simulate_portfolioread-only

Monte Carlo simulation of investing monthly (plus an optional starting sum) in one asset or a mix rebalanced monthly.

compare_portfoliosread-only

Runs the same monthly-investing plan through 2 to 4 portfolios (the same simulation as simulate_portfolio) and returns each one's final outcome range, deepest …

simulate_withdrawalread-only

Monte Carlo simulation of withdrawing a yearly percentage of a starting balance, raised with inflation every month, from a portfolio (the 4% rule and its varia…

simulate_fixed_rateread-only

Deterministic compound growth of monthly contributions (plus an optional starting sum) at a fixed annual return.

get_asset_returnsread-only

Annualised past returns of the assets compoundsim simulates, over the last 5, 10 or 20 years, all the data, or a calendar span: total return with dividends rei…

Test results

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

✓
ConnectsConnected in 340 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 5 tools
pass
✓
Every tool is describedAll 5 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
- ✓simulate_portfolio: Worked (162 ms)
- ✓compare_portfolios: Answered with an error, probably because of our sample input: Input validation error: Invalid arguments for tool compare_portfolios: portfolios: Too small: expected array to have >=2 items
- ✓simulate_withdrawal: Worked (342 ms)
- ✓simulate_fixed_rate: Worked (19 ms)
- ✓get_asset_returns: Worked (21 ms)
pass
✓
Bad inputs give a clean error
All good
- ✓simulate_portfolio: Refused missing required input "portfolio" with a clear error
- ✓simulate_portfolio: Refused wrong type for "monthly" with a clear error
- ✓compare_portfolios: Refused missing required input "portfolios" with a clear error
- ✓compare_portfolios: Refused wrong type for "portfolios" with a clear error
- ✓simulate_withdrawal: Refused missing required input "portfolio" with a clear error
- ✓simulate_withdrawal: Refused wrong type for "balance" with a clear error
- ✓simulate_fixed_rate: Refused missing required input "monthly" with a clear error
- ✓simulate_fixed_rate: Refused wrong type for "monthly" with a clear error
- and 1 more
pass
✓
Fast enough
All good
- ✓Connecting took 340 ms
- ✓Listing tools took 433 ms
- ✓Average tool answer: 121 ms
- ✓simulate_withdrawal: Slowest tool: simulate_withdrawal (342 ms)
pass
✓
No secrets leakedChecked 10 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.

npx qamcp-cli https://compoundsim.app/mcp

Show this score on GitHub

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[![QAmcp score](https://qamcp.dev/s/app-compoundsim-compoundsim.svg)](https://qamcp.dev/s/app-compoundsim-compoundsim.html)

Score over time

1 Nov 2026100

One test so far. New tests will show here.

Reviews

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

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