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Directory / Deweloperuch MCP

Deweloperuch MCP

Q: Is Deweloperuch MCP server safe?

QAmcp's test on 2 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 10 of its tools are labeled read-only. Overall it scored 98/100 on 2 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 mcps.wondel.ai · https://mcp.wondel.ai/deweloperuch/mcp

Polish flat prices on deweloperuch.pl: RCN sale prices (valuation, stats, rankings), asking prices.

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

Visit website

98 /100

PASS · WITH NOTES

11 of 11 checks · 2 Nov 2026

Is Deweloperuch 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 10 of its tools are labeled read-only.
Overall it scored 98/100 on 2 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

10 tools, in the server's own words.

deweloperuch_search_locationsread-only

Find cities, districts and streets in Poland by a fragment of the name.

deweloperuch_estimate_property_valueread-only

Estimate the value of a flat of a given area at a point (lat, lng) in Poland from nearby transaction prices of the Real Estate Price Register (RCN), via dewelo…

deweloperuch_get_transaction_statisticsread-only

Transaction prices of flats in one city from the Real Estate Price Register (RCN), month by month or quarter by quarter: the number of transactions and the pri…

deweloperuch_rank_locationsread-only

A ranking of localities (level=city) or powiats (level=powiat) in Poland by Real Estate Price Register (RCN) transactions: the number of transactions and the t…

deweloperuch_get_buildingread-only

A building of the Real Estate Price Register (RCN): address, coordinates, the site's average prices and the flats sold in it with the date, price, price per m²…

deweloperuch_get_market_statisticsread-only

Statistics of the developers' offer market in one city: the number of offers, investments and developers, the distribution of prices (PLN), prices per m² (PLN/…

deweloperuch_search_investmentsread-only

Search investments (developer projects, primary market).

deweloperuch_get_investmentread-only

An investment (developer project): city, street, coordinates, developer, the average prices of active offers, the number of offers and the list of offers (acti…

deweloperuch_get_offerread-only

One offer with its full price history, investment and developer.

deweloperuch_search_developersread-only

Find developers (primary market) by a fragment of the name, e.g.

Test results

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

!
Fast enough
1 warning
- !deweloperuch_search_locations: Slowest tool: deweloperuch_search_locations (2.6 s): users will notice the wait
- and 3 more
note
!
Follows MCP best practices (not scored yet)
2 tips (not scored)
- !The tool list is about 44 KB (roughly 11k tokens). AI apps send it with every message, so it takes that much of the AI's memory before any work starts.
- !2 tools answer with structured data but don't declare its shape (outputSchema): deweloperuch_search_locations, deweloperuch_search_developers. If those answers change shape, nothing can catch it; with a schema, every answer is checked.
note
✓
ConnectsConnected in 26 ms
pass
✓
Ready for the newest MCP versionUses the latest MCP version (2026-07-28)
pass
✓
Lists its toolsFound 10 tools
pass
✓
Every tool is describedAll 10 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
- ✓deweloperuch_search_locations: Worked (2.6 s)
- ✓deweloperuch_estimate_property_value: Worked (1.2 s)
- ✓deweloperuch_get_transaction_statistics: Answered with an error, probably because of our sample input: Error: deweloperuch.pl has no transaction prices of flats for 'test'. Check city_slug with deweloperuch_search_locations (e.g. warszawa, kr…
- ✓deweloperuch_rank_locations: Worked (1.2 s)
- ✓deweloperuch_get_building: Answered with an error, probably because of our sample input: Error: No building 'test'. A building slug is the last part of the address of its page with transaction prices on deweloperuch.pl, e.g. 23-…
- ✓deweloperuch_get_market_statistics: Answered with an error, probably because of our sample input: Error: deweloperuch.pl does not know the city 'test'. Pass a city_slug from deweloperuch_search_locations (market statistics are for one ci…
- ✓deweloperuch_search_investments: Answered with an error, probably because of our sample input: Error: Pass city (a city slug from deweloperuch_search_locations, e.g. sopot) or name (part of an investment name, e.g. Kolibki); both are …
- ✓deweloperuch_get_investment: Answered with an error, probably because of our sample input: Error: No investment 'test'. Get investment_slug from deweloperuch_search_investments (or from a result that names the investment). See htt…
- and 2 more
pass
✓
Bad inputs give a clean error
All good
- ✓deweloperuch_search_locations: Refused missing required input "query" with a clear error
- ✓deweloperuch_search_locations: Refused wrong type for "query" with a clear error
- ✓deweloperuch_estimate_property_value: Refused missing required input "lat" with a clear error
- ✓deweloperuch_estimate_property_value: Refused wrong type for "lat" with a clear error
- ✓deweloperuch_get_transaction_statistics: Refused missing required input "city" with a clear error
- ✓deweloperuch_get_transaction_statistics: Refused wrong type for "city" with a clear error
- ✓deweloperuch_rank_locations: Refused wrong type for "level" with a clear error
- ✓deweloperuch_get_building: Refused missing required input "building_slug" with a clear error
- and 10 more
pass
✓
No secrets leakedChecked 26 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

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Score over time

2 Nov 202698

One test so far. New tests will show here.

Reviews

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

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