AI agents call readonly_query 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 lowering confidence somewhat, the name 'readonly_query' unambiguously indicates a Read operation—it queries data in read-only mode with no capability to create, modify, delete, or execute. The minimal blast radius of a misused read-only query operation further supports a 'low' severity classification.
From the tool's definition Tool name is 'readonly_query', which explicitly indicates read-only access with no modification capability. The 'readonly' prefix strongly suggests this tool retrieves or queries data without side effects.
Documented attack patterns abuse exactly the kind of access readonly_query 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 readonly_query:
{
"version": "1",
"default": "deny",
"tools": {
"readonly_query": {}
}
}readonly_query is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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readonly_query. 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 readonly_query: 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.
readonly_query 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 readonly_query 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 readonly_query. 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.
readonly_query 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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805 Amazon ECS MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.