Read branch data from a TTree or RNTuple
AI agents call read_branches 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.
This tool retrieves or queries data from CERN ROOT file structures (TTree/RNTuple branches) without modifying, deleting, or executing code. It is a straightforward data access operation with no destructive or execution capabilities. Severity is low because reading scientific data poses minimal risk even if misused by an agent.
From the tool's definition Tool name is 'read_branches' and description states 'Read branch data from a TTree or RNTuple'. The verb 'read' and context of retrieving data from ROOT file structures indicates data retrieval with no side effects.
Attacks that exploit this kind of access
Read branch data from a TTree or RNTuple. 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 read_branches: 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.
read_branches 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 read_branches 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 read_branches. 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.
read_branches 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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