AI agents call mx_check to retrieve information from Idig Dns without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a DNS query operation to retrieve MX record information and detect associated email providers. It is a read-only diagnostic function that returns data about existing DNS configurations without creating, modifying, deleting, or executing any external operations. The low severity reflects minimal blast radius—misuse would only expose DNS infrastructure details already publicly queryable.
From the tool's definition MX health check and provider detection function queries DNS MX records to identify email service providers. The tool name 'mx_check' and description indicate it retrieves and analyzes DNS mail exchange records without modifying them.
Attacks that exploit this kind of access
MX health + provider detection: Google Workspace, M365, Proofpoint, Zoho, 35+ providers. It is categorised as a Read tool in the Idig Dns MCP Server, which means it retrieves data without modifying state.
Register the Idig Dns MCP server in PolicyLayer and add a rule for mx_check: 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 Idig Dns. Nothing to install.
mx_check 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 mx_check 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 mx_check. 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.
mx_check is provided by the Idig Dns MCP server (https://mcp.softricks.net/sse). 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.
Teams ship this data inside their own products. See what a licence covers →