AI agents call list-clusters to retrieve information from Novita MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'list-clusters' operation retrieves or enumerates cluster resources without modifying, deleting, or executing operations. This aligns with the Read category pattern (list operations). While the description is uninformative, the tool name and server context provide sufficient evidence that this is a data retrieval operation. Severity is low because listing clusters poses minimal risk even if misused by an agent.
From the tool's definition Tool name 'list-clusters' indicates a retrieval operation. Description is empty, but the sibling tools context shows this is part of GPU instance/resource management where 'list' operations are standard read-only queries.
Documented attack patterns abuse exactly the kind of access list-clusters gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Novita MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for list-clusters:
{
"version": "1",
"default": "deny",
"tools": {
"list-clusters": {}
}
}list-clusters is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list-clusters. It is categorised as a Read tool in the Novita MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Novita MCP Server MCP server in PolicyLayer and add a rule for list-clusters: 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 Novita MCP Server. Nothing to install.
list-clusters 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-clusters 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-clusters. 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-clusters is provided by the Novita MCP Server MCP server (novitalabs/novita-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Novita 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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20 Novita MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.