AI agents call list_chargebacks 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.
Listing or retrieving chargeback data is a read operation with no direct side effects. However, the severity is elevated to medium rather than low because chargebacks are sensitive financial data whose exposure could reveal payment disputes, customer financial stress, or vulnerability patterns.
From the tool's definition Tool name is 'list_chargebacks' and description states 'List chargebacks', indicating a retrieval operation that queries existing chargeback data without modification.
Documented attack patterns abuse exactly the kind of access list_chargebacks 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_chargebacks:
{
"version": "1",
"default": "deny",
"tools": {
"list_chargebacks": {}
}
}list_chargebacks is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List chargebacks. 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_chargebacks: 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_chargebacks 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_chargebacks 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_chargebacks. 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_chargebacks 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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