Look up the Japanese address for a 7-digit postal code (郵便番号). Returns prefecture, city, and town(s) in kanji, katakana, and romaji, plus the JIS prefecture code and Soumu city code. Hyphens in the input are allowed.
AI agents call lookup_zipcode to retrieve information from jpzip 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 postal code data from a Japanese address dataset and returns formatted address information. It has no side effects, does not create, modify, or delete data, and does not execute arbitrary code or commands. It is a straightforward read-only query operation with minimal security risk.
From the tool's definition Tool description states 'Look up the Japanese address' and 'Returns prefecture, city, and town(s)' — purely a retrieval operation with no modification, deletion, or execution of code.
Attacks that exploit this kind of access
Look up the Japanese address for a 7-digit postal code (郵便番号). Returns prefecture, city, and town(s) in kanji, katakana, and romaji, plus the JIS prefecture code and Soumu city code. Hyphens in the input are allowed. It is categorised as a Read tool in the jpzip MCP server MCP Server, which means it retrieves data without modifying state.
Register the jpzip MCP server MCP server in PolicyLayer and add a rule for lookup_zipcode: 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 jpzip MCP server. Nothing to install.
lookup_zipcode 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_zipcode 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_zipcode. 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_zipcode is provided by the jpzip MCP server MCP server (jpzip/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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