Fragt Fahrgastzahlen der Verkehrsbetriebe Zürich (VBZ) ab.
AI agents call zurich_vbz_passengers to retrieve information from Zurich Open Data MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves historical or real-time passenger count data from Zurich's public transport system. It performs a read-only query operation with no side effects, no data modification, no code execution, and no destructive capabilities. The data is public open data from the City of Zurich. Misuse would at worst return irrelevant statistics but could not harm systems or data integrity.
From the tool's definition Tool name 'zurich_vbz_passengers' and description 'Fragt Fahrgastzahlen der Verkehrsbetriebe Zürich (VBZ) ab' (translates to 'Queries passenger numbers of Zurich Transport (VBZ)') indicate data retrieval without modification or execution.
Documented attack patterns abuse exactly the kind of access zurich_vbz_passengers gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Zurich Open Data MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for zurich_vbz_passengers:
{
"version": "1",
"default": "deny",
"tools": {
"zurich_vbz_passengers": {}
}
}zurich_vbz_passengers is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Fragt Fahrgastzahlen der Verkehrsbetriebe Zürich (VBZ) ab. It is categorised as a Read tool in the Zurich Open Data MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Zurich Open Data MCP Server MCP server in PolicyLayer and add a rule for zurich_vbz_passengers: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Zurich Open Data MCP Server. Nothing to install.
zurich_vbz_passengers is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the zurich_vbz_passengers rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for zurich_vbz_passengers. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
zurich_vbz_passengers is provided by the Zurich Open Data MCP Server MCP server (pypi:zurich-opendata-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Zurich Open Data MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
24 Zurich Open Data MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.