国土交通省の不動産情報ライブラリから不動産価格（取引価格・成約価格）情報を取得します。取引時期、地域（都道府県、市区町村、駅）などを指定して検索することが可能。
Part of the 不動産情報サービス MCP server.
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AI agents call reinfolib-real-estate-price to retrieve information from 不動産情報サービス MCP without modifying any data. This is common in research, monitoring, and reporting workflows where the agent needs context before taking action. Because read operations don't change state, they are generally safe to allow without restrictions -- but you may still want rate limits to control API costs.
Even though reinfolib-real-estate-price only reads data, uncontrolled read access can leak sensitive information or rack up API costs. An agent caught in a retry loop could make thousands of calls per minute. A rate limit gives you a safety net without blocking legitimate use.
Read-only tools are safe to allow by default. No rate limit needed unless you want to control costs.
{
"version": "1",
"default": "deny",
"tools": {
"reinfolib-real-estate-price": {}
}
}See the full 不動産情報サービス MCP policy for all 3 tools.
These attack patterns abuse exactly the kind of access reinfolib-real-estate-price gives an agent. Each links to the full case and the policy that stops it:
Other read tools across the catalogue. The same approach applies to each: allow, with a rate cap to control cost.
国土交通省の不動産情報ライブラリから不動産価格（取引価格・成約価格）情報を取得します。取引時期、地域（都道府県、市区町村、駅）などを指定して検索することが可能。. It is categorised as a Read tool in the 不動産情報サービス MCP MCP Server, which means it retrieves data without modifying state.
Register the 不動産情報サービス MCP server in PolicyLayer and add a rule for reinfolib-real-estate-price: 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 不動産情報サービス MCP. Nothing to install.
reinfolib-real-estate-price 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 reinfolib-real-estate-price 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 reinfolib-real-estate-price. 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.
reinfolib-real-estate-price is provided by the 不動産情報サービス MCP server (https://mcp.n-3.ai/mcp?tools=get-time,reinfolib-real-estate-price,reinfolib-city-list). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 不動産情報サービス MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
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