convert_units · Server MCP: Risk & Policy

WHAT IT DOES

What convert_units does on Server

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

WHY IT NEEDS A POLICY

Why convert_units needs a policy

An AI agent can call convert_units faster than any human can review — one bad instruction and it creates or modifies resources in Server by the hundred, each call as confident as the last.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

convert_units Rate-limited

convert_units 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": {
    "convert_units": {
      "limits": [
        {
          "counter": "convert_units_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 Server, so you can run agents against it safely.

FAQ

Questions about convert_units

What does the convert_units tool do? +

Convert temperature between Celsius and Fahrenheit. It is categorised as a Write tool in the Server MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on convert_units? +

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

What risk level is convert_units? +

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

Can I rate-limit convert_units? +

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

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

convert_units is provided by the Server MCP server (@nest-mcp/server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.