scope_write · LeCroy Oscilloscope MCP: Risk & Policy

WHAT IT DOES

What scope_write does on LeCroy Oscilloscope MCP

AI agents invoke scope_write 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_write needs a policy

The tool name 'scope_write' on a server that sends SCPI commands to physical oscilloscope hardware strongly suggests it writes/sends SCPI commands to the instrument. Writing arbitrary SCPI commands to lab equipment can trigger measurements, change configurations, or alter hardware state in ways that may be difficult to reverse.

From the tool's definition Tool name is 'scope_write' on a LeCroy Oscilloscope MCP server that controls oscilloscopes via SCPI commands. Description is empty.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scope_write Rate-limited

scope_write 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_write": {
      "limits": [
        {
          "counter": "scope_write_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_write

What does the scope_write tool do? +

scope_write. 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_write? +

Register the LeCroy Oscilloscope MCP server in PolicyLayer and add a rule for scope_write: 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_write? +

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

Can I rate-limit scope_write? +

Yes. Add a rate_limit block to the scope_write 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_write completely? +

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

scope_write 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.