list-custom-line-item-versions

THE RISK

Low Risk

Why list-custom-line-item-versions needs a policy

The verb 'list' in the tool name strongly suggests this tool retrieves or queries data about custom line item versions. The empty description reduces certainty, but the naming convention is consistent with Read operations (e.g., 'list' typically retrieves). The tool appears to be part of AWS/billing infrastructure (line-item-versions suggests cost/billing data), making accidental misuse low-risk.

From the tool's definition Tool name 'list-custom-line-item-versions' uses the 'list' verb, which typically indicates a retrieval operation with no side effects.

Documented attack patterns abuse exactly the kind of access list-custom-line-item-versions gives an agent:

POLICY

How to control list-custom-line-item-versions

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 list-custom-line-item-versions:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list-custom-line-item-versions": {}
  }
}

list-custom-line-item-versions 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 →

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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 list-custom-line-item-versions

What does the list-custom-line-item-versions tool do? +

list-custom-line-item-versions. 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 list-custom-line-item-versions? +

Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for list-custom-line-item-versions: 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 list-custom-line-item-versions? +

list-custom-line-item-versions is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit list-custom-line-item-versions? +

Yes. Add a rate_limit block to the list-custom-line-item-versions 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 list-custom-line-item-versions completely? +

Set action: deny in the PolicyLayer policy for list-custom-line-item-versions. 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 list-custom-line-item-versions? +

list-custom-line-item-versions 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 →