List DICT keys registered to the merchant
AI agents call list_dict_keys 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 and returns existing configuration data (DICT keys associated with a merchant account). It performs no write, deletion, execution, or financial operations. The read of merchant configuration keys poses minimal risk even if exposed to an AI agent, as it returns metadata about registered payment identifiers rather than sensitive transaction data or payment-altering capabilities.
From the tool's definition Tool name 'list_dict_keys' and description 'List DICT keys registered to the merchant' indicate a retrieval operation with no side effects. The verb 'list' is explicitly retrieval-focused.
Documented attack patterns abuse exactly the kind of access list_dict_keys 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_dict_keys:
{
"version": "1",
"default": "deny",
"tools": {
"list_dict_keys": {}
}
}list_dict_keys is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List DICT keys registered to the merchant. 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_dict_keys: 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_dict_keys 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_dict_keys 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_dict_keys. 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_dict_keys 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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