check_dmarc

A read tool on the Mcp Nettools MCP server.

SERVERMcp Nettools SOURCEaaronckj/mcp-nettools

Low RISK CLASS

Category Read

Parameters 00 required

Recommended Allowedsee the rule below

Registry record Grade F, identity unverified Pull the record →

This record as markdown: /tools/aaronckj-mcp-nettools/check-dmarc.md

WHAT IT DOES

What check_dmarc does on Mcp Nettools

AI agents call check_dmarc to retrieve information from Mcp Nettools without modifying anything. It is typically the context-gathering step in research, monitoring, and reporting workflows, before the agent takes action elsewhere.

RISK

Why check_dmarc is rated Low

DMARC checking is a read-only network query operation that retrieves DNS records related to email authentication policy for a domain. While the description is empty, the tool name combined with the server's stated purpose (network diagnostics including DNS lookup) strongly suggests this is a passive information retrieval tool.

From the tool's definition Tool name 'check_dmarc' indicates DMARC (Domain-based Message Authentication, Reporting & Conformance) record lookup, consistent with the server's DNS lookup and network diagnostics capabilities.

Attacks that exploit this kind of access

RECOMMENDED RULE

The rule that runs check_dmarc safely

PolicyLayer is an MCP gateway: it sits between your AI agents and Mcp Nettools, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For check_dmarc, this is the rule to start with:

check_dmarc Allowed

check_dmarc is read-only, so it stays allowed. Everything else on the server is denied unless you say otherwise.

View as policy code

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "check_dmarc": {}
  }
}

ALLOW ONLY THIS TOOL → Instant setup, no code required.

The button opens the PolicyLayer dashboard: create your workspace, connect Mcp Nettools, apply this rule, and every check_dmarc call is checked against it from then on.

FAQ

Questions about check_dmarc

What does the check_dmarc tool do? +

check_dmarc is a read tool on the Mcp Nettools MCP server. It is categorised as a Read tool in the Mcp Nettools MCP Server, which means it retrieves data without modifying state.

How do I enforce a policy on check_dmarc? +

Register the Mcp Nettools MCP server in PolicyLayer and add a rule for check_dmarc: 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 Mcp Nettools. Nothing to install.

What risk level is check_dmarc? +

check_dmarc is a Read tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit check_dmarc? +

Yes. Add a rate_limit block to the check_dmarc 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.

How do I block check_dmarc completely? +

Set action: deny in the PolicyLayer policy for check_dmarc. 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.

What MCP server provides check_dmarc? +

check_dmarc is provided by the Mcp Nettools MCP server (aaronckj/mcp-nettools). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

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