list_append_multiple · Amazon MQ MCP Server MCP

WHAT IT DOES

What list_append_multiple does on Amazon MQ MCP Server

AI agents use list_append_multiple to create or update resources in Amazon MQ MCP Server — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Amazon MQ MCP Server environment.

WHY IT NEEDS A POLICY

Why list_append_multiple needs a policy

Appending to a list is a write/modification operation (reversible, as items can be removed). However, the description is minimal and the tool name/description don't clearly connect to AmazonMQ broker management, reducing confidence. Based on available information, this creates/modifies data by appending values, fitting the Write category.

From the tool's definition 'Append multiple values to list' — modifies a list by adding values

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

list_append_multiple Rate-limited

list_append_multiple stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "list_append_multiple": {
      "limits": [
        {
          "counter": "list_append_multiple_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches Amazon MQ MCP Server, so you can run agents against it safely.

FAQ

Questions about list_append_multiple

What does the list_append_multiple tool do? +

Append multiple values to list. It is categorised as a Write tool in the Amazon MQ MCP Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on list_append_multiple? +

Register the Amazon MQ MCP Server MCP server in PolicyLayer and add a rule for list_append_multiple: 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 MQ MCP Server. Nothing to install.

What risk level is list_append_multiple? +

list_append_multiple is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit list_append_multiple? +

Yes. Add a rate_limit block to the list_append_multiple 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 list_append_multiple completely? +

Set action: deny in the PolicyLayer policy for list_append_multiple. 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 list_append_multiple? +

list_append_multiple is provided by the Amazon MQ MCP Server MCP server (awslabs.amazon-mq-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.