tunable_delete

Delete a tunable by its ID. Use tunable_list to find the ID.

SERVERTruenas SOURCEspranab/truenas-mcp

Critical RISK CLASS

Category Destructive

Parameters 00 required

Recommended Hiddensee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/tunable-delete.md

WHAT IT DOES

What tunable_delete does on Truenas

AI agents call tunable_delete to permanently remove resources in Truenas, typically in cleanup and lifecycle workflows. It does its job in a single call, and there is no undo.

RISK

Why tunable_delete is rated Critical

The tool irreversibly deletes system tunables (kernel/system configuration parameters) from TrueNAS. Tunables are persistent configuration settings; deletion cannot be undone without manual reconfiguration or backups. This is a destructive operation that could impact system stability or behavior if critical tunables are deleted.

From the tool's definition Delete a tunable by its ID — explicit deletion operation on system configuration parameters that cannot be trivially restored without knowing previous values.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs tunable_delete safely

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

tunable_delete Hidden

tunable_delete is removed from the agent's tool list entirely, so the agent never calls it. The rest of the server keeps working.

View as policy code

policy.json

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

RESTRICT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about tunable_delete

What does the tunable_delete tool do? +

Delete a tunable by its ID. Use tunable_list to find the ID. 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 tunable_delete? +

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

tunable_delete 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 tunable_delete? +

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

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

tunable_delete 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.

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