AI agents call calculate_statistics to retrieve information from Mdfmcp without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool reads channel data from already-opened MDF files and computes statistics (e.g., min, max, mean, std dev). It does not modify, delete, or write any data, nor does it trigger external operations. It is a pure read/analysis operation.
From the tool's definition 'Calculate statistics for one or more channels' — purely analytical/computational operation on measurement data with no side effects
Attacks that exploit this kind of access
Calculate statistics for one or more channels. It is categorised as a Read tool in the Mdfmcp MCP Server, which means it retrieves data without modifying state.
Register the Mdf MCP server in PolicyLayer and add a rule for calculate_statistics: 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 Mdfmcp. Nothing to install.
calculate_statistics 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 calculate_statistics 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 calculate_statistics. 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.
calculate_statistics is provided by the Mdf MCP server (shanko-26/mdfmcp). 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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