list_accessible_ranges

List ranges accessible to current user.

SERVERLudus FastMCP SOURCEtjnull/ludus-fastmcp

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/tjnull-ludus-fastmcp/list-accessible-ranges.md

WHAT IT DOES

What list_accessible_ranges does on Ludus FastMCP

AI agents call list_accessible_ranges to retrieve information from Ludus FastMCP 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_accessible_ranges is rated Low

This tool retrieves and displays information (ranges and their accessibility status) for the current user. It performs no data modification, deletion, execution of commands, or financial operations. The blast radius is minimal—an AI agent misusing this would at worst enumerate available resources, which poses no direct harm to infrastructure or data integrity.

From the tool's definition Tool name is 'list_accessible_ranges' and description states 'List ranges accessible to current user.' The verb 'list' indicates a read-only query operation with no side effects.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_accessible_ranges safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Ludus FastMCP, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For list_accessible_ranges, this is the rule to start with:

list_accessible_ranges Allowed

list_accessible_ranges 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_accessible_ranges": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about list_accessible_ranges

What does the list_accessible_ranges tool do? +

List ranges accessible to current user. It is categorised as a Read tool in the Ludus FastMCP MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_accessible_ranges? +

Register the Ludus Fast MCP server in PolicyLayer and add a rule for list_accessible_ranges: 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 Ludus FastMCP. Nothing to install.

What risk level is list_accessible_ranges? +

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

Can I rate-limit list_accessible_ranges? +

Yes. Add a rate_limit block to the list_accessible_ranges 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_accessible_ranges completely? +

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

list_accessible_ranges is provided by the Ludus Fast MCP server (tjnull/ludus-fastmcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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