AI agents call list_refunds to retrieve information from Paymongo without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool queries and retrieves existing refund records using cursor pagination. It performs a data retrieval operation with no side effects, reversible actions, code execution, destructive operations, or financial transactions. The retrieval of refund history poses minimal security risk when properly authorized, as it returns metadata about past transactions rather than initiating or modifying them.
From the tool's definition Tool is named 'list_refunds' and described as retrieving refunds with pagination—query-only operation with no modification or deletion of data.
Attacks that exploit this kind of access
List refunds with cursor pagination (before/after by refund ID). It is categorised as a Read tool in the Paymongo MCP Server, which means it retrieves data without modifying state.
Register the Paymongo MCP server in PolicyLayer and add a rule for list_refunds: 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 Paymongo. Nothing to install.
list_refunds 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_refunds 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_refunds. 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_refunds is provided by the Paymongo MCP server (theyahia/paymongo-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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