list_directory_with_sizes

List files and folders in a directory with size summary (MCP-style output)

SERVERCoWork OS SOURCECoWork-OS/CoWork-OS

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/cowork-os/list-directory-with-sizes.md

WHAT IT DOES

What list_directory_with_sizes does on CoWork OS

AI agents call list_directory_with_sizes to retrieve information from CoWork OS 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_directory_with_sizes is rated Low

This tool only queries and retrieves information about the filesystem structure and file sizes. It performs no writes, deletes, executions, or destructive operations. The blast radius of misuse is minimal—an agent could discover directory structure or file sizes it shouldn't access, but cannot modify or delete data.

From the tool's definition Tool name 'list_directory_with_sizes' and description 'List files and folders in a directory with size summary' indicate a read-only operation that retrieves directory contents and metadata without modification.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_directory_with_sizes safely

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

list_directory_with_sizes Allowed

list_directory_with_sizes 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_directory_with_sizes": {}
  }
}

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

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

FAQ

Questions about list_directory_with_sizes

What does the list_directory_with_sizes tool do? +

List files and folders in a directory with size summary (MCP-style output). It is categorised as a Read tool in the CoWork OS MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_directory_with_sizes? +

Register the CoWork OS MCP server in PolicyLayer and add a rule for list_directory_with_sizes: 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 CoWork OS. Nothing to install.

What risk level is list_directory_with_sizes? +

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

Can I rate-limit list_directory_with_sizes? +

Yes. Add a rate_limit block to the list_directory_with_sizes 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_directory_with_sizes completely? +

Set action: deny in the PolicyLayer policy for list_directory_with_sizes. 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_directory_with_sizes? +

list_directory_with_sizes is provided by the CoWork OS MCP server (CoWork-OS/CoWork-OS). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

KEEP EXPLORING

More on CoWork OS, and thousands of servers like it.

This server

All 342 CoWork OS tools →

Across the catalogue

aiva_list_affiliates on AIVA MCP Server →list_agents on 0rca Dojo MCP Server → The MCP Attack Database →

Guides

Roll out MCP under one policy →Data exfiltration →MCP token cost →