Scope: Japan e-Gov catalog datasets.
List provider agencies with dataset counts (24 total).
Use when the user asks "which ministries publish X" or wants an orientation. Top agencies: 厚生労働省 (2,479) · 農林水産省 (2,210) · 文部科学省 (1,986) · 国土交通省 (1,864) · 内閣府 (1,741).