domain_fetch_subdomains

Active

declared in 3.4.2

Enumerate subdomains for a domain via Certificate Transparency logs. Read-only. No side effects. Idempotent. domain: Domain name without protocol e.g. anthropic.com. Required. Returns deduplicated list of known subdomains. Primary source: crt.sh Certificate Transparency (free). Fallback source: RapidDNS (free, passive CT + DNS) — used automatically when crt.sh is unavailable. Response includes source field indicating which source was used. Results are cached 24h — second call returns in under 500ms. First call may be slower (8s max per source). Circuit breaker trips after 3 timeouts or 5xx errors within 600s. Verified sources: crt.sh Certificate Transparency, RapidDNS. 24-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_subdomains", intended_query="{what the user needed}", gap_description="{what was missing or wrong in the result}".

Parameters schema

{
  "type": "object",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "description": "Domain without protocol e.g. anthropic.com. Required."
    }
  },
  "additionalProperties": false
}

What this tool wraps· 0 endpoints

min confidence0.70 0.50

No endpoints wrapped at confidence ≥ 0.50.

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DataNexus MCP

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