AI agents call list_registries to retrieve information from Awslabs Amazon Sns Sqs without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
The 'list_' prefix is a standard AWS SDK pattern for read-only operations that enumerate resources without modification. No side effects, deletions, execution, or financial operations are implied. Empty description reduces confidence slightly, but the semantic meaning of 'list' is unambiguous. Classified as Read with low severity due to the non-sensitive nature of querying available registries.
From the tool's definition Tool name 'list_registries' indicates a retrieval operation that lists registry resources. The description is empty, but the naming convention strongly suggests a read-only listing operation consistent with inventory or metadata queries in AWS services.
Documented attack patterns abuse exactly the kind of access list_registries gives an agent:
PolicyLayer is an MCP gateway — it sits between your AI agents and Awslabs Amazon Sns Sqs, and nothing reaches the server without passing your rules. This is the rule we recommend for list_registries:
{
"version": "1",
"default": "deny",
"tools": {
"list_registries": {}
}
}list_registries is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.
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list_registries. It is categorised as a Read tool in the Awslabs Amazon Sns Sqs MCP Server, which means it retrieves data without modifying state.
Register the Awslabs Amazon Sns Sqs MCP server in PolicyLayer and add a rule for list_registries: 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 Awslabs Amazon Sns Sqs. Nothing to install.
list_registries 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 list_registries 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 list_registries. 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.
list_registries is provided by the Awslabs Amazon Sns Sqs MCP server (awslabs.amazon-sns-sqs-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
Start from Awslabs Amazon Sns Sqs, 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 Awslabs Amazon Sns Sqs tools catalogued and risk-classified — across an index of 43,000+ MCP servers.