Recomendar si es buen momento para comprar un producto basado en datos reales. Analiza precio actual vs promedio, tendencia, y minimo historico. Responde: "si", "tal vez", o "espera". Args: ml_id: ID del producto en Mercado Libre (ej: "MLM31000132")
Part of the PrecioMX - Price Tracker Mexico server.
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AI agents call is_good_time_to_buy to retrieve information from PrecioMX - Price Tracker Mexico 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 is_good_time_to_buy 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": {
"is_good_time_to_buy": {}
}
}See the full PrecioMX - Price Tracker Mexico policy for all 6 tools.
These attack patterns abuse exactly the kind of access is_good_time_to_buy 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.
Recomendar si es buen momento para comprar un producto basado en datos reales. Analiza precio actual vs promedio, tendencia, y minimo historico. Responde: "si", "tal vez", o "espera". Args: ml_id: ID del producto en Mercado Libre (ej: "MLM31000132"). It is categorised as a Read tool in the PrecioMX - Price Tracker Mexico MCP Server, which means it retrieves data without modifying state.
Register the PrecioMX - Price Tracker Mexico MCP server in PolicyLayer and add a rule for is_good_time_to_buy: 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 PrecioMX - Price Tracker Mexico. Nothing to install.
is_good_time_to_buy 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 is_good_time_to_buy 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 is_good_time_to_buy. 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.
is_good_time_to_buy is provided by the PrecioMX - Price Tracker Mexico MCP server (ing-christopherleon/preciomx). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 6 PrecioMX - Price Tracker Mexico tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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