update_automation_rule · AC Infinity MCP: Risk & Policy

WHAT IT DOES

What update_automation_rule does on AC Infinity MCP

AI agents use update_automation_rule to create or update resources in AC Infinity MCP — usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your AC Infinity MCP environment.

WHY IT NEEDS A POLICY

Why update_automation_rule needs a policy

The tool modifies existing automation rules governing AC Infinity controllers (fan speeds, port states). This is reversible (rules can be updated again), so it is Write rather than Destructive. Severity is medium because misconfigured automation rules could cause environmental control failures (temperature, humidity drift in grow environments), but the changes are not permanent or financial.

From the tool's definition Tool name 'update_automation_rule' indicates modification of automation rules. Sibling tools include 'add_automation_rule', 'delete_automation_rule', and 'delete_advance_automation', establishing this as a data modification context.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

update_automation_rule Rate-limited

update_automation_rule 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.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "update_automation_rule": {
      "limits": [
        {
          "counter": "update_automation_rule_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

LIMIT THIS TOOL →

Instant setup, no code required.

PolicyLayer is an MCP gateway: every tool call is checked against your rule before it reaches AC Infinity MCP, so you can run agents against it safely.

FAQ

Questions about update_automation_rule

What does the update_automation_rule tool do? +

update_automation_rule. It is categorised as a Write tool in the AC Infinity MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on update_automation_rule? +

Register the AC Infinity MCP server in PolicyLayer and add a rule for update_automation_rule: 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 AC Infinity MCP. Nothing to install.

What risk level is update_automation_rule? +

update_automation_rule is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.

Can I rate-limit update_automation_rule? +

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

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

update_automation_rule is provided by the AC Infinity MCP server (ober37/ac-infinity-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.