List currently connected MDP clients and their path catalogs.
AI agents call listClients to retrieve information from Model Drive Protocol MCP Server 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 operation that discovers and returns metadata about currently connected clients and their available paths. There are no side effects, no code execution, no data modification, and no destructive operations.
From the tool's definition Tool name 'listClients' and description 'List currently connected MDP clients and their path catalogs' indicate a query/enumeration operation that retrieves information about connected clients without modifying, executing, or deleting anything.
Documented attack patterns abuse exactly the kind of access listClients gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Model Drive Protocol MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for listClients:
{
"version": "1",
"default": "deny",
"tools": {
"listClients": {}
}
}listClients is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List currently connected MDP clients and their path catalogs. It is categorised as a Read tool in the Model Drive Protocol MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Model Drive Protocol MCP Server MCP server in PolicyLayer and add a rule for listClients: 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 Model Drive Protocol MCP Server. Nothing to install.
listClients 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 listClients 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 listClients. 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.
listClients is provided by the Model Drive Protocol MCP Server MCP server (modeldriveprotocol/modeldriveprotocol). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Model Drive Protocol MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
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4 Model Drive Protocol MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.