client_list

Get a list of connected clients to the Valkey server.

SERVERAWS SOURCE@awslabs/mcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity verified Pull the record →

This record as markdown: /tools/aws/client-list.md

WHAT IT DOES

What client_list does on AWS

AI agents call client_list to retrieve information from AWS without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why client_list is rated Low

This tool only retrieves a list of connected clients from a Valkey (Redis-compatible) server. It performs no modification, deletion, execution of arbitrary code, or financial operations. It is a straightforward read/query operation with minimal blast radius—knowledge of connected clients alone poses low risk unless combined with other attacks.

From the tool's definition Tool name 'client_list' and description 'Get a list of connected clients to the Valkey server' indicate a query operation that retrieves information without modifying state.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs client_list safely

PolicyLayer is an MCP gateway: it sits between your AI agents and AWS, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For client_list, this is the rule to start with:

client_list Allowed

client_list is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "client_list": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect AWS, apply this rule, and every client_list call is checked against it from then on.

FAQ

Questions about client_list

What does the client_list tool do? +

Get a list of connected clients to the Valkey server. It is categorised as a Read tool in the AWS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on client_list? +

Register the AWS MCP server in PolicyLayer and add a rule for client_list: 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 AWS. Nothing to install.

What risk level is client_list? +

client_list is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit client_list? +

Yes. Add a rate_limit block to the client_list 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.

How do I block client_list completely? +

Set action: deny in the PolicyLayer policy for client_list. 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.

What MCP server provides client_list? +

client_list is provided by the AWS MCP server (@awslabs/mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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