histogram_arithmetic · CERN ROOT MCP Server MCP

WHAT IT DOES

What histogram_arithmetic does on CERN ROOT MCP Server

AI agents invoke histogram_arithmetic 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 histogram_arithmetic needs a policy

This tool performs computational operations on histogram data (arithmetic like asymmetry, difference, ratio). It executes a calculation/transformation on data rather than simply reading it or writing/storing new data. The results depend on the arguments provided (which histograms and which operation).

From the tool's definition Perform bin-by-bin arithmetic on two histograms (e.g. asymmetry, difference, ratio)

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

histogram_arithmetic Rate-limited

histogram_arithmetic 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": {
    "histogram_arithmetic": {
      "limits": [
        {
          "counter": "histogram_arithmetic_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 histogram_arithmetic

What does the histogram_arithmetic tool do? +

Perform bin-by-bin arithmetic on two histograms (e.g. asymmetry, difference, ratio). 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 histogram_arithmetic? +

Register the CERN ROOT MCP Server MCP server in PolicyLayer and add a rule for histogram_arithmetic: 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 histogram_arithmetic? +

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

Can I rate-limit histogram_arithmetic? +

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

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

histogram_arithmetic 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.