Busca as melhores oportunidades de renda fixa disponíveis na Meelion, com filtros por tipo de investimento, distribuidor, instituição, prazo e limite de resultados. Modo aberto (meelion_pro=0): no máximo 5 itens, seeMoreOnSite aponta para o comparador em www.meelion.com. Modo Pro (meelion_pro=1):...
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AI agents call get_best_investments to retrieve information from Meelion 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 get_best_investments 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": {
"get_best_investments": {}
}
}See the full Meelion MCP policy for all 5 tools.
These attack patterns abuse exactly the kind of access get_best_investments 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.
Busca as melhores oportunidades de renda fixa disponíveis na Meelion, com filtros por tipo de investimento, distribuidor, instituição, prazo e limite de resultados. Modo aberto (meelion_pro=0): no máximo 5 itens, seeMoreOnSite aponta para o comparador em www.meelion.com. Modo Pro (meelion_pro=1): padrão 10 com acesso completo e 5 com acesso limitado; o parâmetro limit respeita teto 200 (completo) ou 10 (limitado). detailUrl e links de site usam a base pública (MCP.public_base_url). Use quando o usuário quiser encontrar onde o dinheiro pode render mais, comparar CDB, LCI, LCA, CRI, CRA, debêntures ou outros produtos de renda fixa, ver rankings de melhores investimentos de hoje, melhores investimentos por prazo, por tipo ou por corretora/banco. Os dados são indicativos e podem mudar; o usuário deve confirmar as condições na instituição financeira antes de investir. English keywords: Brazilian fixed income, best investments today, CDB, LCI, LCA, CRI, CRA, debentures, highest yield, investment ranking, maturity, distributor, issuer, net return, gross yield.. It is categorised as a Read tool in the Meelion MCP MCP Server, which means it retrieves data without modifying state.
Register the Meelion MCP server in PolicyLayer and add a rule for get_best_investments: 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 Meelion MCP. Nothing to install.
get_best_investments 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 get_best_investments 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 get_best_investments. 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.
get_best_investments is provided by the Meelion MCP server (https://mcp.meelion.com/). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Deterministic rules across all 5 Meelion MCP tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.
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