list_remove

SERVERAWS SOURCE@awslabs/mcp

Medium RISK CLASS

Category Write

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity verified Pull the record →

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

WHAT IT DOES

What list_remove does on AWS

AI agents use list_remove to create or update resources in AWS, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AWS environment.

RISK

Why list_remove is rated Medium

The tool modifies a list data structure by removing elements. This is a Write operation (reversible data modification) rather than Destructive, since the list itself persists and values could be re-inserted. Misuse could cause data loss from a list, warranting medium severity.

From the tool's definition "Remove occurrences of value from list" — modifies a list by deleting specific values, but this is a reversible data modification (values can be re-added)

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_remove 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 list_remove, this is the rule to start with:

list_remove Rate-limited

list_remove 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_remove": {
      "limits": [
        {
          "counter": "list_remove_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about list_remove

What does the list_remove tool do? +

Remove occurrences of value from list. Args: key: The name of the key value: Value to remove count: Number of occurrences to remove (0 for all, positive for left-to-right, negative for right-to-left) Returns: Success message or error message. It is categorised as a Write tool in the AWS 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_remove? +

Register the AWS MCP server in PolicyLayer and add a rule for list_remove: 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 list_remove? +

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

Can I rate-limit list_remove? +

Yes. Add a rate_limit block to the list_remove 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_remove completely? +

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

list_remove 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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