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DataNexus MCP

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Python
Hybrid

domain_fetch_domain_rdap

Read-onlyIdempotent

Retrieve registration metadata for any domain using IANA RDAP, the modern structured replacement for WHOIS. Get registrar, registration/expiry dates, nameservers, and registrant info where public.

Instructions

Fetch domain registration details via IANA RDAP (the modern structured replacement for WHOIS). Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. example.com not https://example.com. Required. Returns registrar, registration date, expiry date, nameservers, and registrant info where publicly available. Use this when you need registration metadata. Use domain_fetch_ssl_certificate_chain instead when you need certificate history. Use domain_fetch_dns_records instead when you need live DNS resolution. Verified source: IANA RDAP. 4-hour cache. If this tool's response does not serve the user's need, call report_feedback with feedback_type="agent_gap", tool_id="domain_fetch_domain_rdap", intended_query="{what the user needed}", gap_description="{what was missing or wrong in the result}".

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
domainYesDomain without protocol e.g. example.com. Required.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv2.1.16
    • addedInput schema / properties / domain / description
      Added value: +"Domain without protocol e.g. example.com. Required."
  2. Addedv2.1.8
  3. Removedv2.1.7
  4. First observedv0.1.0

TDQS

A4.4/5.0
Behavior4/5

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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description reinforces these ('Read-only. No side effects. Idempotent.') and adds cache duration (4-hour cache) and data source (IANA RDAP), providing useful context beyond annotations.

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

Conciseness4/5

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

The description is well-structured with clear sections but contains some redundancy (e.g., repeating annotations). It is front-loaded with the primary purpose and remains concise overall.

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

Completeness5/5

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

Given the single parameter, strong annotations, explicit usage guidelines, output schema existence, and a fallback feedback instruction, the description is fully complete for an agent to select and invoke the tool correctly.

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

Parameters3/5

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

Schema coverage is 100% and the description repeats the parameter format ('domain without protocol'). It adds minor clarity ('not https://example.com') but does not significantly enhance the schema information.

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 fetches domain registration details via IANA RDAP and lists the returned fields (registrar, dates, nameservers, registrant info). It distinguishes from sibling tools like domain_fetch_ssl_certificate_chain and domain_fetch_dns_records.

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

Usage Guidelines5/5

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

Explicitly states when to use ('when you need registration metadata') and provides alternatives for certificate history and DNS resolution. Also includes a feedback mechanism for cases where the response is insufficient.

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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