scope_set_tdiv · LeCroy Oscilloscope MCP: Risk & Policy

WHAT IT DOES

What scope_set_tdiv does on LeCroy Oscilloscope MCP

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

WHY IT NEEDS A POLICY

Why scope_set_tdiv needs a policy

This tool modifies oscilloscope configuration by changing the time base setting. It is a reversible write operation (the setting can be changed back), but misuse by an AI agent could disrupt ongoing measurements or experiments. No data is deleted and no code is executed.

From the tool's definition Set the time base (time per division)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

scope_set_tdiv Rate-limited

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

FAQ

Questions about scope_set_tdiv

What does the scope_set_tdiv tool do? +

Set the time base (time per division). It is categorised as a Write tool in the LeCroy Oscilloscope MCP MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.

How do I enforce a policy on scope_set_tdiv? +

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

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

Can I rate-limit scope_set_tdiv? +

Yes. Add a rate_limit block to the scope_set_tdiv 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_set_tdiv completely? +

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

scope_set_tdiv 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.