AI agents call open_mdf 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.
Opening a file and creating a session is a read/initialization operation. It accesses the filesystem to read an MDF measurement data file. Severity is medium because it involves filesystem access and session state creation, and misuse could expose sensitive automotive/industrial measurement data, but it does not modify or destroy anything.
From the tool's definition 'Open an MDF file and create a new session' — opens a file for reading and establishes a session; no data is modified or deleted.
Attacks that exploit this kind of access
Open an MDF file and create a new session. 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 open_mdf: 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.
open_mdf 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 open_mdf 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 open_mdf. 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.
open_mdf 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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