scope_beep · LeCroy Oscilloscope MCP: Risk & Policy

WHAT IT DOES

What scope_beep does on LeCroy Oscilloscope MCP

AI agents invoke scope_beep to trigger actions in LeCroy Oscilloscope MCP. 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 scope_beep needs a policy

This tool executes a command on remote hardware (the oscilloscope beeper) but with minimal blast radius. It produces only an audible signal with no data modification, deletion, or financial impact. While it is an Execute category action (triggers external hardware operation), the severity is low because misuse would only result in unwanted beeping, not harm to data, measurements, or the instrument's state.

From the tool's definition Tool description states 'Trigger the oscilloscope audible beeper' - an action that causes external hardware to perform an operation. The verb 'trigger' indicates execution of a command with observable side effects.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scope_beep Rate-limited

scope_beep 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": {
    "scope_beep": {
      "limits": [
        {
          "counter": "scope_beep_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 LeCroy Oscilloscope MCP, so you can run agents against it safely.

FAQ

Questions about scope_beep

What does the scope_beep tool do? +

Trigger the oscilloscope audible beeper. Useful for confirming operations. It is categorised as a Execute tool in the LeCroy Oscilloscope MCP MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on scope_beep? +

Register the LeCroy Oscilloscope MCP server in PolicyLayer and add a rule for scope_beep: 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 LeCroy Oscilloscope MCP. Nothing to install.

What risk level is scope_beep? +

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

Can I rate-limit scope_beep? +

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

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

scope_beep is provided by the LeCroy Oscilloscope MCP server (lucasgerads/lecroy-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.