set_oplock_state · mcpXL30 MCP: Risk & Policy

WHAT IT DOES

What set_oplock_state does on mcpXL30

AI agents invoke set_oplock_state to trigger actions in mcpXL30. 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 set_oplock_state needs a policy

The tool name suggests setting an 'oplock' (operator lock) state on a Philips XL30 ESEM microscope. In electron microscopy systems, an operator lock controls access to microscope controls, potentially enabling or disabling operator override of safety systems.

From the tool's definition Tool name 'set_oplock_state' on a microscope control server; description is empty and uninformative.

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

set_oplock_state Rate-limited

set_oplock_state 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": {
    "set_oplock_state": {
      "limits": [
        {
          "counter": "set_oplock_state_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 mcpXL30, so you can run agents against it safely.

FAQ

Questions about set_oplock_state

What does the set_oplock_state tool do? +

set_oplock_state. It is categorised as a Execute tool in the mcpXL30 MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on set_oplock_state? +

Register the mcpXL30 MCP server in PolicyLayer and add a rule for set_oplock_state: 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 mcpXL30. Nothing to install.

What risk level is set_oplock_state? +

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

Can I rate-limit set_oplock_state? +

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

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

set_oplock_state is provided by the mcpXL30 MCP server (tspspi/mcpxl30). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.