bootenv_activate

Activate a boot environment so it will be used on next boot.

SERVERTruenas SOURCEspranab/truenas-mcp

High RISK CLASS

Category Execute

Parameters 00 required

Recommended Rate-limitedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/spranab-truenas-mcp/bootenv-activate.md

WHAT IT DOES

What bootenv_activate does on Truenas

AI agents invoke bootenv_activate to trigger actions in Truenas. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call: builds kicked off, notifications sent, workflows started.

RISK

Why bootenv_activate is rated High

Activating a boot environment changes which OS/system state will be loaded on the next reboot. This is an external system operation with significant impact — it can cause the system to boot into a different configuration or version, potentially causing instability or service disruption. It's not purely a write (data modification) but triggers a consequential system-level state change.

From the tool's definition Activate a boot environment so it will be used on next boot

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs bootenv_activate 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 bootenv_activate, this is the rule to start with:

bootenv_activate Rate-limited

bootenv_activate 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.

View as policy code

policy.json

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

RATE-LIMIT THIS TOOL → Instant setup, no code required.

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

FAQ

Questions about bootenv_activate

What does the bootenv_activate tool do? +

Activate a boot environment so it will be used on next boot. 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 bootenv_activate? +

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

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

Can I rate-limit bootenv_activate? +

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

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

bootenv_activate 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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