Update UPS service configuration. All fields are optional — only provide the ones you want to change.
AI agents use ups_config_update to create or update resources in Truenas — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Truenas environment.
This tool modifies system configuration (UPS service settings) but does not delete data or execute arbitrary code. Changes to UPS configuration are reversible by issuing another update. However, severity is elevated to 'high' because misconfigured UPS settings could impact power management, system shutdown behavior, and data integrity during power events—affecting the entire NAS infrastructure's resilience.
From the tool's definition Tool name and description indicate 'Update UPS service configuration' with optional field modifications. The verb 'Update' and context of modifying UPS (Uninterruptible Power Supply) settings confirms reversible state changes.
Documented attack patterns abuse exactly the kind of access ups_config_update gives an agent:
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 ups_config_update:
{
"version": "1",
"default": "deny",
"tools": {
"ups_config_update": {
"limits": [
{
"counter": "ups_config_update_rate",
"window": "minute",
"max": 30,
"scope": "grant"
}
]
}
}
}ups_config_update stays usable, but capped — an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
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Update UPS service configuration. All fields are optional — only provide the ones you want to change. It is categorised as a Write tool in the Truenas MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Truenas MCP server in PolicyLayer and add a rule for ups_config_update: 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.
ups_config_update is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the ups_config_update 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.
Set action: deny in the PolicyLayer policy for ups_config_update. 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.
ups_config_update 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.
Start from Truenas, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.
Free to start. No card required.
279 Truenas tools catalogued and risk-classified — across an index of 43,000+ MCP servers.