Fetch a payment object by id via GET /v2/payments/{type}/{id}. type is one of
AI agents call get_payment_details 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 is a read-only retrieval operation. Although it accesses payment-related data (which is sensitive), the tool only fetches and returns existing payment information without modifying, deleting, or transferring funds. The GET method confirms no side effects. Severity is low because reading payment details, while sensitive from a privacy perspective, does not commit financial transactions or alter system state.
From the tool's definition Tool description explicitly states "Fetch a payment object by id via GET /v2/payments/{type}/{id}" — uses HTTP GET method and retrieves data without modification.
Documented attack patterns abuse exactly the kind of access get_payment_details 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_payment_details:
{
"version": "1",
"default": "deny",
"tools": {
"get_payment_details": {}
}
}get_payment_details is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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Fetch a payment object by id via GET /v2/payments/{type}/{id}. type is one of. 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_payment_details: 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_payment_details 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_payment_details 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_payment_details. 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_payment_details 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.
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