商品名・型番を指定して楽天市場内で最安値を比較します。送料・ポイント還元込みの実質価格で順位付けして返します。
Risk signalsAccepts freeform code/query input (query)
Part of the HoShy server.
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AI agents call compare_prices to retrieve information from HoShy 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 compare_prices 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": {
"compare_prices": {}
}
}See the full HoShy policy for all 3 tools.
These attack patterns abuse exactly the kind of access compare_prices 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.
商品名・型番を指定して楽天市場内で最安値を比較します。送料・ポイント還元込みの実質価格で順位付けして返します。. It is categorised as a Read tool in the HoShy MCP Server, which means it retrieves data without modifying state.
Register the HoShy MCP server in PolicyLayer and add a rule for compare_prices: 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 HoShy. Nothing to install.
compare_prices 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 compare_prices 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 compare_prices. 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.
compare_prices is provided by the HoShy MCP server (https://hoshy.negimaru1025.workers.dev/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 HoShy tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
Free to start. No card required.
4,600+ MCP servers and 31,000+ tools scanned and risk-classified.