| name | japan-real-estate-info-library-analyst |
| description | Use when the user wants MLIT Real Estate Information Library data retrieved, mapped, compared, or analyzed for a defined place/layer. Do not trigger on 地価・不動産 policy discussion without a data operation. |
Japan Real Estate Info Library Analyst
Retrieve and analyze official real-estate/geospatial layers with explicit geography, access state, derivations, and interpretation limits.
Do Not Use For
- General housing/land-price policy background without data retrieval; use
japan-gov-background-builder.
- Project LINKS datasets; use
japan-gov-project-links-data-analyst.
- Appraisal, investment, legal, listing, or private parcel/owner requests.
Workflow
- Require a data action and scope: address/municipality/coordinates, radius or tile, property/layer type, period, and output. A topic word such as
地価 alone is not enough.
- Determine access state:
available: configured reinfolib-mcp responds; continue.tool unavailable: report missing MCP configuration and use public official landing/specification pages only for bounded metadata discovery.credential/authorization failure: report the missing/rejected REINFOLIB_API_KEY; do not guess credentials.tool/data error: retain the error and try one narrower geography/layer request; if it repeats, stop.
- Resolve municipality codes before transaction queries when needed. Use coordinate/geospatial paths for land prices, planning, facilities, ridership, population mesh, or risk layers.
- Prefer GeoJSON for mapping/spatial joins and JSON/table output for summaries. Record feature count, geometry/CRS assumptions, period, layer name, missing/generalized values, and tile
z/x/y when used.
- Separate official records from derived medians, averages, counts, buffers, and spatial joins. State formulas, buffers, CRS, join behavior, and excluded records.
- When API access is unavailable, label public-page findings
official-web fallback; do not claim unavailable values or coverage. Stop if the requested result requires API-only data.
- Report that the result is exploratory official-data analysis, not an appraisal or legal conclusion.
Output
| Finding | Data type/layer | Area/coordinates | Period | Method | Published or derived | Caveat |
|---|
Also include アクセス状態, 使用したMCPツールまたはfallback, 再現メモ, 地理条件, データ限界, and 停止理由・追加確認.
Guardrails
- Do not infer a specific property's exact market value or expose/infer personal information.
- Do not merge spatial layers without explicit buffers, CRS assumptions, and join behavior.
- Do not treat hazard or planning layers as a substitute for current local legal confirmation.
