set_io_port_value · Zont MCP: Risk & Policy

WHAT IT DOES

What set_io_port_value does on Zont

AI agents use set_io_port_value 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_io_port_value needs a policy

The name suggests this tool sets a value on an I/O port of a ZONT heating system device, which would constitute a write/control action on physical hardware. Setting I/O port values on heating systems could have significant real-world consequences (e.g., enabling/disabling actuators, sensors, or control outputs). However, the description is empty, which lowers confidence.

From the tool's definition Tool name 'set_io_port_value' implies writing a value to an I/O port on a physical heating device.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_io_port_value Rate-limited

set_io_port_value 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_io_port_value": {
      "limits": [
        {
          "counter": "set_io_port_value_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 Zont, so you can run agents against it safely.

FAQ

Questions about set_io_port_value

What does the set_io_port_value tool do? +

set_io_port_value. 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_io_port_value? +

Register the Zont MCP server in PolicyLayer and add a rule for set_io_port_value: 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_io_port_value? +

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

Can I rate-limit set_io_port_value? +

Yes. Add a rate_limit block to the set_io_port_value 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_io_port_value completely? +

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

set_io_port_value 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.