AI agents call KendraListIndexesTool 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 slightly, the naming convention 'List' + index resource type clearly indicates this retrieves index metadata without modification or execution. Kendra index listing has minimal blast radius—it exposes metadata about search indexes but cannot modify data, execute code, or cause financial impact. Classified as Read with low severity.
From the tool's definition Tool name 'KendraListIndexesTool' contains 'List' which indicates a query/retrieval operation. The tool appears to be for listing Kendra search indexes, a read-only data retrieval action.
Documented attack patterns abuse exactly the kind of access KendraListIndexesTool 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 KendraListIndexesTool:
{
"version": "1",
"default": "deny",
"tools": {
"KendraListIndexesTool": {}
}
}KendraListIndexesTool is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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KendraListIndexesTool. 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 KendraListIndexesTool: 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.
KendraListIndexesTool 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 KendraListIndexesTool 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 KendraListIndexesTool. 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.
KendraListIndexesTool 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.