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Agent use case: Look up addresses by postal code

Document v1 · published by Koskamo · updated 2026-10-18

Original source

Retrieve the full standardized address details for a given Japanese postal code, useful for verifying customer locations or populating address fields in forms.

The agent takes a valid Japanese postal code as input. It calls the lookup_zipcode tool to retrieve the associated address components. The agent returns the prefecture, city, and town name to the user, ensuring the data is accurate and up-to-date with Japan Post's official data.

Prompt: What is the full address for postal code 100-0005? Provide the prefecture, city, and town.

Source and provenance

Original source
addresstozip.jp
Published on Koskamo by
Koskamo
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