directory_services_cache_refresh

THE RISK

High Risk

Why directory_services_cache_refresh needs a policy

This tool triggers an external operation (forced re-read from a directory server) rather than simply reading cached data or writing new data. It actively initiates a synchronization process with an external system. Misuse could cause temporary service disruption or load on the directory server, but effects are not permanent/destructive, making it Execute at medium severity.

From the tool's definition Refresh the directory services cache. Forces re-read of users and groups from the directory server.

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

POLICY

How to control directory_services_cache_refresh

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 directory_services_cache_refresh:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "directory_services_cache_refresh": {
      "limits": [
        {
          "counter": "directory_services_cache_refresh_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

directory_services_cache_refresh stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. 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.

RATE-LIMIT THIS TOOL →

Free to start. No card required.

EXPLORE

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Go deeper

High-risk tools in Truenas → Every high-risk tool this server exposes, in one view.
All high-risk MCP tools → Every high-risk tool across the catalogue, and the policy pattern that contains them.
The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Agent sandbox → Bounding what an agent can execute and where the boundary should sit.
Least privilege for MCP → Granting agents the minimum tool surface the task needs.
Rate Limiting MCP Tool Calls: A Practical Guide →
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FAQ

Questions about directory_services_cache_refresh

What does the directory_services_cache_refresh tool do? +

Refresh the directory services cache. Forces re-read of users and groups from the directory server. It is categorised as a Execute tool in the Truenas MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on directory_services_cache_refresh? +

Register the Truenas MCP server in PolicyLayer and add a rule for directory_services_cache_refresh: 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 directory_services_cache_refresh? +

directory_services_cache_refresh is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit directory_services_cache_refresh? +

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

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

directory_services_cache_refresh 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 →