list_position

Find position(s) of value in list. Args: key: The name of the key value: Value to search for rank: Match the Nth occurrence (optional) count: Return this many matches (optional) maxlen: Limit search to first N elements (optional) Returns: Position(s) 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-position.md

WHAT IT DOES

What list_position does on AWS

AI agents call list_position 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_position is rated Low

The tool performs a search operation to locate values within a list structure, comparable to a standard list indexing or search function. It retrieves information without creating, modifying, deleting, or executing any operations. The parameters are all read filters (search terms, limits, occurrence matching). No data is altered, deleted, or executed as a result of this operation.

From the tool's definition Tool description states "Find position(s) of value in list" with parameters for searching (key, value, rank, count, maxlen) and returns "Position(s) or error message". This is a read-only query operation with no modification or side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

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

list_position Allowed

list_position 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_position": {}
  }
}

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_position call is checked against it from then on.

FAQ

Questions about list_position

What does the list_position tool do? +

How do I enforce a policy on list_position? +

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

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

Can I rate-limit list_position? +

Yes. Add a rate_limit block to the list_position 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_position completely? +

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

list_position 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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