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NebenkostenPro
de.nebenkostenpro/nebenkosten in the official MCP registry.
Endpoint https://nebenkostenpro.de/mcp.
The registry describes it as: German housing costs: utility costs of 400 cities, property tax rates, housing benefit, deadlines.
We read its 9 tools on 2026-10-28. Nothing in them matched our tool-poisoning rules. It also sets server instructions, text a client puts in front of the model on connect; those were read too.
A clean read means these rules found nothing, not that the server is harmless. A server can change its tools at any time, which is why the index reads it again every week.
Tools it advertises
start_bill_check start_bill_creation search_places get_city_costs get_property_tax_rate get_housing_benefit_rent_level calculate_deadlines get_bill_statistics list_operating_cost_types
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[](https://lazaretto.dev/mcp-registry/de-nebenkostenpro-nebenkosten)How this was checked
Lazaretto connects to the endpoint the way any MCP client does, asks the server to introduce itself and list its tools, and reads every name, description, parameter schema and server instruction for tool poisoning: hidden directive blocks, orders to read local secrets, parameters built to carry secrets or the conversation out, orders that redirect another server's tools, and invisible characters. It never calls a tool. What we found across the registry.
To run the same check every time Claude Code adds a server, install the free lazaretto-guard plugin. Browse every server in the index.