cloudsync_list_buckets

THE RISK

Low Risk

Why cloudsync_list_buckets needs a policy

This tool queries and returns information about remote cloud storage buckets associated with a given credential. It performs a read-only operation with no side effects, matching the Read category definition of retrieving or querying data. The severity is low because misuse would only expose metadata about available buckets, not compromise data integrity or enable destructive operations.

From the tool's definition Tool name includes 'list' and description states 'List remote buckets' — both indicate data retrieval with no modification or deletion.

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

POLICY

How to control cloudsync_list_buckets

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

policy.json

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

cloudsync_list_buckets 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 Truenas — 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

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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.
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Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about cloudsync_list_buckets

What does the cloudsync_list_buckets tool do? +

List remote buckets for a cloud credential. It is categorised as a Read tool in the Truenas MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on cloudsync_list_buckets? +

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

What risk level is cloudsync_list_buckets? +

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

Can I rate-limit cloudsync_list_buckets? +

Yes. Add a rate_limit block to the cloudsync_list_buckets 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 cloudsync_list_buckets completely? +

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

cloudsync_list_buckets is provided by the Truenas MCP server (spranab/truenas-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Truenas tool call.

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

CHECK YOUR STACK →