AI agents call ListPullThroughCacheRules to retrieve information from Amazon EKS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'List' prefix indicates a read-only retrieval operation querying pull-through cache rules. No side effects or modifications to resources are implied. This is consistent with AWS API patterns where List* operations are read-only queries. Severity is low because discovering cache rules poses minimal risk even if exposed to an AI agent without proper access controls.
From the tool's definition Tool name 'ListPullThroughCacheRules' contains the verb 'List', which retrieves/queries data without modification. The EKS context suggests querying ECR pull-through cache configuration. Empty description reduces confidence slightly.
Documented attack patterns abuse exactly the kind of access ListPullThroughCacheRules gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Amazon EKS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ListPullThroughCacheRules:
{
"version": "1",
"default": "deny",
"tools": {
"ListPullThroughCacheRules": {}
}
}ListPullThroughCacheRules is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ListPullThroughCacheRules. It is categorised as a Read tool in the Amazon EKS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Amazon EKS MCP Server MCP server in PolicyLayer and add a rule for ListPullThroughCacheRules: 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 Amazon EKS MCP Server. Nothing to install.
ListPullThroughCacheRules 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 ListPullThroughCacheRules 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 ListPullThroughCacheRules. 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.
ListPullThroughCacheRules is provided by the Amazon EKS MCP Server MCP server (awslabs.eks-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Amazon EKS 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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