Query available cuota programs for a given card BIN and amount. Returns the list of issuer-offered installment plans (number of cuotas, with/without interest) that can be attached via create_installment_plan.
AI agents call list_installment_options 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 queries installment options from a payment provider and returns information without creating, modifying, deleting, or executing any financial transaction. It is a read-only lookup that gathers data to inform downstream decisions (evidenced by the reference to 'create_installment_plan' as a separate subsequent action).
From the tool's definition Tool description states it 'Query available cuota programs' and 'Returns the list' — purely retrieval operations with no state changes. Keywords: 'Query', 'Returns the list'.
Documented attack patterns abuse exactly the kind of access list_installment_options 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 list_installment_options:
{
"version": "1",
"default": "deny",
"tools": {
"list_installment_options": {}
}
}list_installment_options is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
Free to start. No card required.
Query available cuota programs for a given card BIN and amount. Returns the list of issuer-offered installment plans (number of cuotas, with/without interest) that can be attached via create_installment_plan. 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 list_installment_options: 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.
list_installment_options 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 list_installment_options 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 list_installment_options. 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.
list_installment_options 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.