Look up a participating bank by its ABM/SPEI code (first 3 digits of CLABE)
AI agents call lookup_bank_by_code 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.
This tool performs a simple lookup of reference data (bank codes and names) based on a code parameter. It has no side effects, does not execute code, does not modify data, does not delete anything, and does not involve financial transactions—it merely retrieves or queries existing bank directory information. This is a classic Read operation.
From the tool's definition Tool name 'lookup_bank_by_code' and description 'Look up a participating bank by its ABM/SPEI code' indicate a query operation that retrieves information about banks without modifying, executing, or moving money.
Documented attack patterns abuse exactly the kind of access lookup_bank_by_code 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 lookup_bank_by_code:
{
"version": "1",
"default": "deny",
"tools": {
"lookup_bank_by_code": {}
}
}lookup_bank_by_code 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 a participating bank by its ABM/SPEI code (first 3 digits of CLABE). 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 lookup_bank_by_code: 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.
lookup_bank_by_code 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 lookup_bank_by_code 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 lookup_bank_by_code. 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.
lookup_bank_by_code 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.
1300 Mcp Ap2 tools catalogued and risk-classified — across an index of 43,000+ MCP servers.