set_relay · Zont MCP: Risk & Policy

WHAT IT DOES

What set_relay does on Zont

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

WHY IT NEEDS A POLICY

Why set_relay needs a policy

The name 'set_relay' strongly implies writing/modifying the state of a relay (on/off). In the context of a heating system (ZONT), relays control physical hardware like boilers, pumps, or valves. This is a Write action with high severity because misconfiguration could disrupt heating, cause equipment damage, or affect safety systems. Confidence is reduced due to the empty description.

From the tool's definition Tool name 'set_relay' with empty description. Based on name, it sets a relay state in a heating system.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_relay Rate-limited

set_relay 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": {
    "set_relay": {
      "limits": [
        {
          "counter": "set_relay_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}

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Instant setup, no code required.

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

FAQ

Questions about set_relay

What does the set_relay tool do? +

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

How do I enforce a policy on set_relay? +

Register the Zont MCP server in PolicyLayer and add a rule for set_relay: 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 Zont. Nothing to install.

What risk level is set_relay? +

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

Can I rate-limit set_relay? +

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

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

set_relay is provided by the Zont MCP server (mab2908/zont-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.