AI agents call dd_list_users to retrieve information from Ppdm without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves user configuration data from a Data Domain storage appliance without creating, modifying, deleting, or executing any operations. It is a passive read operation that poses minimal risk if invoked by an AI agent, as it only exposes existing user account metadata.
From the tool's definition Tool name contains 'list' and description states 'List local users configured on Data Domain' — a straightforward information retrieval operation with no modification or execution.
Attacks that exploit this kind of access
List local users configured on Data Domain. It is categorised as a Read tool in the Ppdm MCP Server, which means it retrieves data without modifying state.
Register the Ppdm MCP server in PolicyLayer and add a rule for dd_list_users: 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 Ppdm. Nothing to install.
dd_list_users 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 dd_list_users 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 dd_list_users. 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.
dd_list_users is provided by the Ppdm MCP server (moodswing9/ppdm-mcp-server). 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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