AI agents call ListAHOReferences to retrieve information from Amazon ECS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
List operations in AWS services typically retrieve or enumerate existing resources without modifying them. Given the tool name pattern and context within an AWS ECS automation server, this tool most likely queries or lists existing AHO (Athena Handler Objects or similar AWS resource) references. No mutation, deletion, or execution is indicated.
From the tool's definition Tool name 'ListAHOReferences' contains the verb 'List', which is a query operation that retrieves data without side effects. The description is empty, limiting confidence, but the naming convention strongly suggests a read-only retrieval of references.
Documented attack patterns abuse exactly the kind of access ListAHOReferences gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Amazon ECS MCP Server, and nothing reaches the server without passing your rules. This is the rule we recommend for ListAHOReferences:
{
"version": "1",
"default": "deny",
"tools": {
"ListAHOReferences": {}
}
}ListAHOReferences is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ListAHOReferences. It is categorised as a Read tool in the Amazon ECS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the Amazon ECS MCP Server MCP server in PolicyLayer and add a rule for ListAHOReferences: 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 ECS MCP Server. Nothing to install.
ListAHOReferences 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 ListAHOReferences 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 ListAHOReferences. 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.
ListAHOReferences is provided by the Amazon ECS MCP Server MCP server (awslabs.ecs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Amazon ECS 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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