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dns-mcp

dns-mcp

by r0bin2u
OverviewSchemaSourceRelated ServersDiscussionsAdmin
Python
Remote

reverse_dns

Reverse-resolve an IP address to its PTR record, revealing the hostname it points to via a reverse DNS lookup.

Instructions

Reverse-resolve an IP address to its PTR record (the hostname it points to).

Args:
    ip: IPv4 or IPv6 address, e.g. "140.82.121.4".

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "ip": "<ip>"
    },
    "name": "reverse_dns"
  }
}

Input Schema

NameRequiredDescriptionDefault
ipYes

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

A3.8/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations provided, the description must disclose behavioral traits. It mentions the output is a PTR record/hostname and gives an example, but does not cover error handling, support for private IPs, or rate limits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Extremely concise: one sentence for purpose, one for parameter description. No unnecessary words, and the key information is front-loaded.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness4/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a single-parameter tool with no output schema, the description covers the operation and input adequately. It could be improved by explicitly stating the return type, but the mention of 'PTR record (the hostname it points to)' strongly implies the result.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description adds value by specifying that 'ip' accepts both IPv4 and IPv6 addresses and providing an example. However, it could include more detail such as format requirements.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool performs reverse DNS resolution, converting an IP address to its PTR record (hostname). This action is distinct from siblings like geo_ip (geolocation), resolve_dns (forward DNS), and whois_domain (domain registration).

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines3/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage is implied for obtaining a hostname from an IP, but no explicit guidance on when to use this tool versus siblings, or any prerequisites or limitations.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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