Compute 2D histogram (supports derived variables via defines)
AI agents call compute_histogram_2d to retrieve information from CERN ROOT MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
Computing a 2D histogram is a read/query operation: it reads data from a ROOT file, applies optional transformations (defines), and returns a histogram result. No data is written, deleted, or externally triggered. The blast radius is low since misuse would at most produce incorrect analysis results, not damage data or systems.
From the tool's definition 'Compute 2D histogram' — this is a data analysis/computation operation that reads data from ROOT files and produces a histogram; 'supports derived variables via defines' indicates it may perform transformations on read data
Attacks that exploit this kind of access
Compute 2D histogram (supports derived variables via defines). It is categorised as a Read tool in the CERN ROOT MCP Server MCP Server, which means it retrieves data without modifying state.
Register the CERN ROOT MCP Server MCP server in PolicyLayer and add a rule for compute_histogram_2d: 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.
compute_histogram_2d is a Read tool with low risk. Read-only tools are generally safe to allow by default.
Yes. Add a rate_limit block to the compute_histogram_2d 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.
Set action: deny in the PolicyLayer policy for compute_histogram_2d. 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.
compute_histogram_2d 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.
Every MCP server has a record like this.
Type a name, get the same breakdown: verified identity, auth posture, risk grade, capabilities, recommended policy.
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