AI agents call list_postcodes_in_canton 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 and queries publicly available geodata without modification, deletion, execution, or financial impact. It is a straightforward data lookup utility with no capability to alter state or trigger external operations. Low severity due to read-only nature and public data source.
From the tool's definition Tool name and description explicitly state 'List' (retrieves data) and 'Accepts... canton codes' (queries with no side effects). Returns postcode reference data from federal geodata source (swisstopo).
Attacks that exploit this kind of access
List all Swiss postcodes (PLZ) in a given canton. Accepts 2-letter canton codes (ZH, BE, GR…) or full names. 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 list_postcodes_in_canton: 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.
list_postcodes_in_canton 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 list_postcodes_in_canton 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 list_postcodes_in_canton. 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.
list_postcodes_in_canton 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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