run_root_macro · CERN ROOT MCP Server MCP: Risk & Policy

WHAT IT DOES

What run_root_macro does on CERN ROOT MCP Server

AI agents invoke run_root_macro to trigger actions in CERN ROOT MCP Server. 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 run_root_macro needs a policy

This tool allows execution of arbitrary C++ code through ROOT's ProcessLine interface. While the context is scientific data analysis on CERN ROOT files, the ability to execute arbitrary C++ macros provides broad computational and system-level capabilities. An AI agent misusing this could execute malicious code, access sensitive files, modify data, or compromise the system.

From the tool's definition Tool description explicitly states 'Execute a ROOT C++ macro via gROOT.ProcessLine'. The name 'run_root_macro' combined with execution via ProcessLine indicates arbitrary code execution capability.

Risk signalsAdmin/system-level operation

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

run_root_macro Rate-limited

run_root_macro 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": {
    "run_root_macro": {
      "limits": [
        {
          "counter": "run_root_macro_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 CERN ROOT MCP Server, so you can run agents against it safely.

FAQ

Questions about run_root_macro

What does the run_root_macro tool do? +

Execute a ROOT C++ macro via gROOT.ProcessLine. It is categorised as a Execute tool in the CERN ROOT MCP Server MCP Server, which means it can trigger actions or run processes. Use rate limits and argument validation.

How do I enforce a policy on run_root_macro? +

Register the CERN ROOT MCP Server MCP server in PolicyLayer and add a rule for run_root_macro: 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 CERN ROOT MCP Server. Nothing to install.

What risk level is run_root_macro? +

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

Can I rate-limit run_root_macro? +

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

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

run_root_macro is provided by the CERN ROOT MCP Server MCP server (mohamedelashri/root-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.