list_insert_after · Amazon MQ MCP Server MCP: Risk & Policy

WHAT IT DOES

What list_insert_after does on Amazon MQ MCP Server

AI agents use list_insert_after 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_insert_after needs a policy

The tool inserts a new value into a list after a specified pivot element, which is a reversible data modification (Write). It creates/modifies data but does not delete or irreversibly destroy anything. Severity is medium as misuse could corrupt list data structures in the broker configuration.

From the tool's definition Insert value after pivot in list

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

list_insert_after Rate-limited

list_insert_after 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_insert_after": {
      "limits": [
        {
          "counter": "list_insert_after_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_insert_after

What does the list_insert_after tool do? +

Insert value after pivot in 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_insert_after? +

Register the Amazon MQ MCP Server MCP server in PolicyLayer and add a rule for list_insert_after: 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_insert_after? +

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

Can I rate-limit list_insert_after? +

Yes. Add a rate_limit block to the list_insert_after 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_insert_after completely? +

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

list_insert_after 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.