jog · Cnc Fluidnc MCP: Risk & Policy

WHAT IT DOES

What jog does on Cnc Fluidnc

AI agents invoke jog to trigger actions in Cnc Fluidnc. What it does depends on the arguments the agent supplies, and its effects often reach beyond the immediate call — builds kicked off, notifications sent, workflows started.

WHY IT NEEDS A POLICY

Why jog needs a policy

This tool directly commands physical movement of a CNC router's axes. Misuse could cause tool crashes, workpiece damage, or physical harm to operators. It is an Execute-category tool (triggers external physical operation) with high severity due to real-world mechanical consequences.

From the tool's definition 'Jog the CNC machine along an axis by a specified distance at a given feed rate. Uses incremental mode ($J=G91)' — triggers physical movement of CNC hardware

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

jog Rate-limited

jog stays usable, but rate-capped — a runaway agent can't fire it dozens of times a minute. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "jog": {
      "limits": [
        {
          "counter": "jog_rate",
          "window": "minute",
          "max": 10,
          "scope": "grant"
        }
      ]
    }
  }
}

RATE-LIMIT THIS TOOL →

Instant setup, no code required.

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

FAQ

Questions about jog

What does the jog tool do? +

Jog the CNC machine along an axis by a specified distance at a given feed rate. Uses incremental mode ($J=G91). It is categorised as a Execute tool in the Cnc Fluidnc MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on jog? +

Register the Cnc Fluidnc MCP server in PolicyLayer and add a rule for jog: 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 Cnc Fluidnc. Nothing to install.

What risk level is jog? +

jog is a Execute tool with high risk. Execute tools should be rate-limited and have argument validation enabled.

Can I rate-limit jog? +

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

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

jog is provided by the Cnc Fluidnc MCP server (whitneydesignlabs/cnc-fluidnc-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.