compute_histogram · CERN ROOT MCP Server MCP: Risk & Policy

WHAT IT DOES

What compute_histogram does on CERN ROOT MCP Server

AI agents invoke compute_histogram 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 compute_histogram needs a policy

This tool executes computational operations (histogram computation and curve fitting) on data. It does not merely read/retrieve raw data but actively processes and transforms it, potentially running statistical fitting algorithms. Fitting support implies execution of numerical methods. It does not delete data or involve financial transactions, placing it in Execute category.

From the tool's definition 'Compute 1D histogram with fitting support' — performing computation and fitting operations on data from ROOT files

Attacks that exploit this kind of access

Recommended rule Ready

Verdict

compute_histogram Rate-limited

compute_histogram 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": {
    "compute_histogram": {
      "limits": [
        {
          "counter": "compute_histogram_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 compute_histogram

What does the compute_histogram tool do? +

Compute 1D histogram with fitting support. 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 compute_histogram? +

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

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

Can I rate-limit compute_histogram? +

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

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

compute_histogram 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.

// THE FULL RECORD

compute_histogram is one line of CERN ROOT MCP Server's registry record.

The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.

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