snapshot_rollback

THE RISK

Critical Risk

Why snapshot_rollback needs a policy

Rolling back a dataset to a snapshot permanently destroys all data written after that snapshot was taken. This is irreversible and affects potentially large storage volumes, making it critical severity. The description itself flags it as destructive.

From the tool's definition 'Rollback a dataset to a snapshot (destructive — requires confirm)' — explicitly labeled destructive; rolling back a dataset overwrites all current data irreversibly

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

POLICY

How to control snapshot_rollback

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 snapshot_rollback:

policy.json

{
  "version": "1",
  "default": "deny",
  "hide": [
    "snapshot_rollback"
  ]
}

snapshot_rollback disappears from the agent's tool list entirely, and any attempt to call it is denied. The rest of the server keeps working.

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.

RESTRICT THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 279 Truenas tools →

Destructive tools on other servers

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Go deeper

Critical-risk tools in Truenas → Every critical-risk tool this server exposes, in one view.
All critical-risk MCP tools → Every critical-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.
Blast radius → How much damage one compromised or confused agent can do — and how to bound it.
Tool call approval → Approval gates on individual tool calls: auto-allow, prompt, or deny.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about snapshot_rollback

What does the snapshot_rollback tool do? +

Rollback a dataset to a snapshot (destructive — requires confirm). It is categorised as a Destructive tool in the Truenas MCP Server, which means it can permanently delete or destroy data. Block by default and require explicit approval.

How do I enforce a policy on snapshot_rollback? +

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

snapshot_rollback is a Destructive tool with critical risk. Critical-risk tools should be blocked by default and only enabled with explicit human approval.

Can I rate-limit snapshot_rollback? +

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

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

snapshot_rollback 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 →