AI agents call list_nodes to retrieve information from EVE-NG MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool retrieves or queries data about nodes in a lab without creating, modifying, or deleting any resources. It is a straightforward read operation with minimal risk if misused by an AI agent, as it only returns information about the lab topology.
From the tool's definition Tool name is 'list_nodes' and description states 'List all nodes in a lab' — a pure query operation with no modification or side effects.
Documented attack patterns abuse exactly the kind of access list_nodes gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and EVE-NG MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list_nodes:
{
"version": "1",
"default": "deny",
"tools": {
"list_nodes": {}
}
}list_nodes is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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List all nodes in a lab. It is categorised as a Read tool in the EVE-NG MCP Server MCP Server, which means it retrieves data without modifying state.
Register the EVE-NG MCP Server MCP server in PolicyLayer and add a rule for list_nodes: 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 EVE-NG MCP Server. Nothing to install.
list_nodes 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_nodes 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_nodes. 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_nodes is provided by the EVE-NG MCP Server MCP server (moimran/eveng-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from EVE-NG 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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26 EVE-NG MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.