AI agents call ListAHOReferenceStores 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.
Despite the empty description, the naming convention 'List*' in AWS APIs consistently denotes read operations that query and return resource information. This tool retrieves information about AHO (AWS Health Omics) Reference Stores, which is a non-destructive data retrieval operation.
From the tool's definition Tool name 'ListAHOReferenceStores' indicates a listing/enumeration operation. The 'List' prefix is a standard AWS API pattern for read-only queries that retrieve metadata about resources without modification.
Documented attack patterns abuse exactly the kind of access ListAHOReferenceStores 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 ListAHOReferenceStores:
{
"version": "1",
"default": "deny",
"tools": {
"ListAHOReferenceStores": {}
}
}ListAHOReferenceStores is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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ListAHOReferenceStores. 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 ListAHOReferenceStores: 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.
ListAHOReferenceStores 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 ListAHOReferenceStores 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 ListAHOReferenceStores. 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.
ListAHOReferenceStores 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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