Query A records (IPv4 addresses) for a domain
AI agents call query_a_record to retrieve information from DNS MCP Server without modifying anything — typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.
This tool performs a straightforward DNS query to retrieve IPv4 address mappings. DNS queries are informational lookups with no side effects, no code execution, no data modification, and no financial implications. The tool falls squarely into the Read category. Severity is low because DNS query results are typically public information, and misuse would only enable reconnaissance rather than direct system compromise.
From the tool's definition Tool name 'query_a_record' and description 'Query A records (IPv4 addresses) for a domain' indicate a read-only DNS query operation that retrieves publicly available DNS information without modifying, executing, or deleting any data.
Attacks that exploit this kind of access
Query A records (IPv4 addresses) for a domain. It is categorised as a Read tool in the DNS MCP Server MCP Server, which means it retrieves data without modifying state.
Register the DNS MCP Server MCP server in PolicyLayer and add a rule for query_a_record: 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 DNS MCP Server. Nothing to install.
query_a_record 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 query_a_record 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 query_a_record. 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.
query_a_record is provided by the DNS MCP Server MCP server (stanibaj/dns-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
query_a_record is one line of DNS MCP Server's registry record.
The record carries the whole server: verified identity, auth posture, risk grade, every tool classified, recommended policy — re-checked continuously.
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