AI agents call search_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.
This tool retrieves postcode data from a public geodatabase in response to locality name queries. It has no side effects, creates no data, executes no code, and cannot modify or delete information. It is a straightforward read operation returning structured data. Severity is low because misuse would only retrieve publicly available geographic reference data with no sensitive exposure or destructive potential.
From the tool's definition Tool description states it 'Search[es] Swiss postcodes' and 'Returns all PLZ entries matching the name' from federal geodata. The verb 'Search' and 'Returns' indicate read-only query operations with no modification or execution.
Attacks that exploit this kind of access
Search Swiss postcodes by city or locality name. Returns all PLZ entries matching the name. 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 search_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.
search_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 search_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 search_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.
search_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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