ListKnowledgeBases

THE RISK

Low Risk

Why ListKnowledgeBases needs a policy

The verb 'List' strongly suggests a read-only query operation that enumerates knowledge bases. Even though the description is missing, the naming convention indicates data retrieval with no side effects. This falls squarely in the Read category with low severity due to its query-only nature.

From the tool's definition Tool name 'ListKnowledgeBases' indicates a list operation, which retrieves data without modification. Description is empty, reducing confidence slightly.

Documented attack patterns abuse exactly the kind of access ListKnowledgeBases gives an agent:

POLICY

How to control ListKnowledgeBases

PolicyLayer is an MCP gateway — it sits between your AI agents and Prometheus MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ListKnowledgeBases:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "ListKnowledgeBases": {}
  }
}

ListKnowledgeBases is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Prometheus MCP Server — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about ListKnowledgeBases

What does the ListKnowledgeBases tool do? +

ListKnowledgeBases. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on ListKnowledgeBases? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for ListKnowledgeBases: 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 Prometheus MCP Server. Nothing to install.

What risk level is ListKnowledgeBases? +

ListKnowledgeBases is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit ListKnowledgeBases? +

Yes. Add a rate_limit block to the ListKnowledgeBases 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.

How do I block ListKnowledgeBases completely? +

Set action: deny in the PolicyLayer policy for ListKnowledgeBases. 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.

What MCP server provides ListKnowledgeBases? +

ListKnowledgeBases is provided by the Prometheus MCP Server MCP server (awslabs.prometheus-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Prometheus MCP Server tool call.

Start from Prometheus MCP Server, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →