Use ONLY when the query consists entirely of explicit numeric/categorical constraints with NO descriptive language (no mood, view, atmosphere, or aesthetic words). Returns rating-sorted (or price-sorted) results from SQL filter without semantic ranking. For ANY query containing descriptors like '...
Risk signalsHigh parameter count (15 properties)
Part of the Arcasos Rentals server.
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AI agents call search_rentals_structured to retrieve information from Arcasos Rentals 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 search_rentals_structured 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": {
"search_rentals_structured": {}
}
}See the full Arcasos Rentals policy for all 3 tools.
These attack patterns abuse exactly the kind of access search_rentals_structured 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.
Use ONLY when the query consists entirely of explicit numeric/categorical constraints with NO descriptive language (no mood, view, atmosphere, or aesthetic words). Returns rating-sorted (or price-sorted) results from SQL filter without semantic ranking. For ANY query containing descriptors like 'cozy', 'quiet', 'luxury', 'river view', 'modern', use search_rentals_natural instead — it produces better results in a single call. Returns Schema.org Accommodation format.. It is categorised as a Read tool in the Arcasos Rentals MCP Server, which means it retrieves data without modifying state.
Register the Arcasos Rentals MCP server in PolicyLayer and add a rule for search_rentals_structured: 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 Arcasos Rentals. Nothing to install.
search_rentals_structured 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 search_rentals_structured 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 search_rentals_structured. 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.
search_rentals_structured is provided by the Arcasos Rentals MCP server (https://mcp.arcasos.com). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 3 Arcasos Rentals tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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