list_folder

List contents of Dropbox folder

SERVERNcp SOURCE@portel/ncp

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/io-github-portel-dev-ncp/list-folder.md

WHAT IT DOES

What list_folder does on Ncp

AI agents call list_folder to retrieve information from Ncp 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_folder is rated Low

This tool retrieves and queries folder contents from Dropbox without creating, modifying, or deleting data. It is a read-only operation. Severity is medium rather than low because listing folder contents could expose sensitive file names, metadata, or organizational structure depending on permissions and what data is stored in the Dropbox folder.

From the tool's definition Tool name 'list_folder' combined with description 'List contents of Dropbox folder' indicates data retrieval with no modification capability.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs list_folder safely

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

list_folder Allowed

list_folder 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_folder": {}
  }
}

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

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

FAQ

Questions about list_folder

What does the list_folder tool do? +

List contents of Dropbox folder. It is categorised as a Read tool in the Ncp MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on list_folder? +

Register the Ncp MCP server in PolicyLayer and add a rule for list_folder: 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 Ncp. Nothing to install.

What risk level is list_folder? +

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

Can I rate-limit list_folder? +

Yes. Add a rate_limit block to the list_folder 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_folder completely? +

Set action: deny in the PolicyLayer policy for list_folder. 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_folder? +

list_folder is provided by the Ncp MCP server (@portel/ncp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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