io.github.Mameta29/japan-data-mcp
Japan Data MCP
Is the Japan Data MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-30.
30 tools for Japanese data: address, furigana, transit, Diet, holidays, weather, corporate registry
alive probed 2026-11-14 · unchanged since 2026-10-30
- Run it
- npx -y @mameta/japan-data-mcp@1.1.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- japan-data-mcp 1.0.0
- Capabilities
- tools
- Instructions
- 1 025 characters
- Of a 1M window
- 0.6 % of a 1M context window
- Count
- 5.8k tokens in Claude Opus 5.5, exact, measured 2026-10-16. With the Claude Code prefix mcp__…__ on each tool name: 6.2k. The o200k_base estimate is 3.2k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/Mameta29/japan-data-mcp
- Website
- https://agentic-jp.com
- Registry
- active, updated 2026-07-07 · registry entry
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.80×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| diet_minutes_search | 415 | 230 | 7 % |
| houjin_kyb_report | 352 | 195 | 6 % |
| diet_members_search | 344 | 191 | 6 % |
| diet_topic_track | 325 | 180 | 6 % |
| houjin_search | 283 | 157 | 5 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- MakeMyClip Editor io.github.MakeMyClip/editor · needs env
- io.github.MakkCH/minecraft-mcp · needs env
- Frame Lens io.github.Makkov-design/framelens · alive
- Vaults Diagram Tools io.github.Malnati/vaults-diagram-tools · crashed on start
- ManaBuy MCP Server io.github.ManaBuyTeam/manabuy-mcp · alive
- io.github.MananSingh2001/figma-react · alive
- designlang io.github.Manavarya09/designlang · alive
- Spreadsheet DB io.github.ManddarinShop/spreadsheet-db-mcp · needs env
Servers that mention japan.
- 障害福祉AI辞典 (Japan Disability Welfare Dictionary) ai.fukushi/dictionary · alive
- KIKARET ai.kikaret/mcp · alive
- RoamTime Japan Foliage Forecast ai.roamtime/foliage · alive
- app.netlify.japan-data-mcp/japan-data-mcp · alive
- Japanese Order Eval app.netlify.shigoto-dogu/order-eval · alive
- app.potto/potto-japan · needs auth
- Japan Logistics (Ship&co: Yamato / Sagawa / Japan Post labels + tracking) app.wishpool/japan-logistics-mcp · no DNS
- Japan Payments (KOMOJU — konbini / cards / PayPay) app.wishpool/japan-payments-mcp · no DNS
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- The server answers initialize and tools/list. Nothing to fix.