AI agents call lookup_postcode to retrieve information from Mcp Swiss without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The tool performs a simple lookup of public postal code information, returning read-only geographic metadata. It has no side effects, cannot modify data, execute code, or affect financial systems. The severity is low because misuse would only expose publicly available geographic data. High confidence due to clear, informative description indicating a straightforward read operation.
From the tool's definition Tool description: 'Look up a Swiss postcode (PLZ) to get locality name, canton, and coordinates.' This is a pure query operation that retrieves static geodata without modification, deletion, or execution of arbitrary code.
Attacks that exploit this kind of access
Look up a Swiss postcode (PLZ) to get locality name, canton, and coordinates. Source: Swiss federal geodata (swisstopo). It is categorised as a Read tool in the Mcp Swiss MCP Server, which means it retrieves data without modifying state.
Register the Mcp Swiss MCP server in PolicyLayer and add a rule for lookup_postcode: 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 Mcp Swiss. Nothing to install.
lookup_postcode 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 lookup_postcode 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 lookup_postcode. 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.
lookup_postcode is provided by the Mcp Swiss MCP server (mcp-swiss). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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