A list of tags applied to the resource.
AI agents call ListTagsForResource to retrieve information from Prometheus 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 metadata about a resource (its tags) without modifying, deleting, or executing anything. It is a straightforward read operation on AWS Managed Prometheus resources. The blast radius is minimal—an agent misusing this tool would only gain visibility into tag metadata, which typically does not expose highly sensitive data or enable further attack paths on its own.
From the tool's definition Tool name is 'ListTagsForResource' and description states 'A list of tags applied to the resource.' The verb 'List' and the retrieval of metadata (tags) indicate a query operation with no side effects.
Documented attack patterns abuse exactly the kind of access ListTagsForResource gives an agent:
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 ListTagsForResource:
{
"version": "1",
"default": "deny",
"tools": {
"ListTagsForResource": {}
}
}ListTagsForResource is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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A list of tags applied to the resource. It is categorised as a Read tool in the Prometheus MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Prometheus MCP Server MCP server in PolicyLayer and add a rule for ListTagsForResource: 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.
ListTagsForResource 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 ListTagsForResource 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 ListTagsForResource. 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.
ListTagsForResource 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.
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.
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805 Prometheus MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.