list_range

Get range of values from list. Args: key: The name of the key start: Start index (inclusive, default 0) stop: Stop index (inclusive, default -1 for end) Returns: List of values or error message

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/list-range.md

WHAT IT DOES

What list_range does on AWS

AI agents call list_range 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 list_range is rated Low

This tool retrieves a subset of data from a list by index range. It is a read-only operation with no capability to modify, delete, or execute external operations. The parameters are straightforward data access controls (start/stop indices). Blast radius is minimal as misuse would only expose already-accessible data.

From the tool's definition Tool name 'list_range' and description 'Get range of values from list' indicate retrieval of data with parameters for start and stop indices. The function returns 'List of values or error message' with no mention of modifications or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

list_range Allowed

list_range 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": {
    "list_range": {}
  }
}

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 list_range call is checked against it from then on.

FAQ

Questions about list_range

What does the list_range tool do? +

Get range of values from list. Args: key: The name of the key start: Start index (inclusive, default 0) stop: Stop index (inclusive, default -1 for end) Returns: List of values or error message. 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 list_range? +

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

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

Can I rate-limit list_range? +

Yes. Add a rate_limit block to the list_range 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_range completely? +

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

list_range 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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