get_folder

THE RISK

Low Risk

Why get_folder needs a policy

This tool retrieves folder metadata by ID. It is a read-only query operation that returns data without side effects, matching the Read category definition. The severity is low because folder retrieval poses minimal risk—it accesses only the structure/metadata of an existing folder without executing code, modifying data, or exposing sensitive content beyond normal access control.

From the tool's definition Tool name 'get_folder' and description 'Get a folder by its ID' indicate a retrieval operation with no modification or deletion capability.

Documented attack patterns abuse exactly the kind of access get_folder gives an agent:

POLICY

How to control get_folder

PolicyLayer is an MCP gateway — it sits between your AI agents and Carbon Voice, and nothing reaches the server without passing your rules. This is the rule we recommend for get_folder:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "get_folder": {}
  }
}

get_folder is read-only, so it stays allowed — but everything else on the server is denied unless you say otherwise.

Create a free account and register Carbon Voice — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

CAP THIS TOOL →

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EXPLORE

Related tools and policies

More Carbon Voice tools

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Data exfiltration → How read access becomes an exfiltration channel when chained with untrusted content.
MCP token cost → What connecting this server costs in context-window tokens on every request.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about get_folder

What does the get_folder tool do? +

Get a folder by its ID. It is categorised as a Read tool in the Carbon Voice MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on get_folder? +

Register the Carbon Voice MCP server in PolicyLayer and add a rule for get_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 Carbon Voice. Nothing to install.

What risk level is get_folder? +

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

Can I rate-limit get_folder? +

Yes. Add a rate_limit block to the get_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 get_folder completely? +

Set action: deny in the PolicyLayer policy for get_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 get_folder? +

get_folder is provided by the Carbon Voice MCP server (phononx/cv-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Carbon Voice tool call.

Start from Carbon Voice, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

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