Look up address by CEP using BrasilAPI v1 (single-provider, often faster than v2)
AI agents call get_cep_v1 to retrieve information from Mcp Ap2 without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
CEP (Código de Endereçamento Postal) lookup is a straightforward read-only query against a geographic database. It retrieves public address data associated with a Brazilian postal code without any side effects, modifications, or execution of code. This is a canonical 'Read' operation with minimal security risk in isolation.
From the tool's definition Tool performs a 'Look up address by CEP' operation, which is a pure data retrieval function that queries a postal code database (BrasilAPI) and returns corresponding address information. No state is modified, deleted, or created.
Documented attack patterns abuse exactly the kind of access get_cep_v1 gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Mcp Ap2, and nothing reaches the server without passing your rules. This is the rule we recommend for get_cep_v1:
{
"version": "1",
"default": "deny",
"tools": {
"get_cep_v1": {}
}
}get_cep_v1 is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Look up address by CEP using BrasilAPI v1 (single-provider, often faster than v2). It is categorised as a Read tool in the Mcp Ap2 MCP Server, which means it retrieves data without modifying state.
Register the Mcp Ap2 MCP server in PolicyLayer and add a rule for get_cep_v1: 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 Mcp Ap2. Nothing to install.
get_cep_v1 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_cep_v1 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_cep_v1. 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_cep_v1 is provided by the Mcp Ap2 MCP server (@codespar/mcp-ap2). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Mcp Ap2, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
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