cycle_resume · Cnc Fluidnc MCP: Risk & Policy

WHAT IT DOES

What cycle_resume does on Cnc Fluidnc

AI agents invoke cycle_resume 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 cycle_resume needs a policy

This tool resumes physical CNC machine motion, triggering real-world mechanical operation. Misuse could cause physical harm, damage workpieces, or injure operators if the machine resumes unexpectedly. It falls under Execute as it triggers an external physical operation whose effects depend on machine state.

From the tool's definition Resume machine motion after a feed hold. Sends

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

cycle_resume Rate-limited

cycle_resume 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": {
    "cycle_resume": {
      "limits": [
        {
          "counter": "cycle_resume_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 cycle_resume

What does the cycle_resume tool do? +

Resume machine motion after a feed hold. Sends. 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 cycle_resume? +

Register the Cnc Fluidnc MCP server in PolicyLayer and add a rule for cycle_resume: 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 cycle_resume? +

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

Can I rate-limit cycle_resume? +

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

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

cycle_resume 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.