Pesquisa viaturas no catálogo Carvox com filtros opcionais. Devolve lista de carros com preço, km, combustível e link.
Risk signalsHigh parameter count (11 properties)
Part of the Carvox — Carros Usados em Portugal server.
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AI agents call search_cars to retrieve information from Carvox — Carros Usados em Portugal 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_cars 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_cars": {}
}
}See the full Carvox — Carros Usados em Portugal policy for all 4 tools.
These attack patterns abuse exactly the kind of access search_cars 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.
Pesquisa viaturas no catálogo Carvox com filtros opcionais. Devolve lista de carros com preço, km, combustível e link.. It is categorised as a Read tool in the Carvox — Carros Usados em Portugal MCP Server, which means it retrieves data without modifying state.
Register the Carvox — Carros Usados em Portugal MCP server in PolicyLayer and add a rule for search_cars: 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 Carvox — Carros Usados em Portugal. Nothing to install.
search_cars 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_cars 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_cars. 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_cars is provided by the Carvox — Carros Usados em Portugal MCP server (https://www.carvox.pt/api/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 4 Carvox — Carros Usados em Portugal tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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