Create DESCRIPTION.md

skills/domain/DESCRIPTION.md

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+---
+name: domain-intel
+description: Passive domain reconnaissance using Python stdlib. Use this skill for subdomain discovery, SSL certificate inspection, WHOIS lookups, DNS records, domain availability checks, and bulk multi-domain analysis. No API keys required. Triggers on requests like "find subdomains", "check ssl cert", "whois lookup", "is this domain available", "bulk check these domains".
+license: MIT
+---
+
+Passive domain intelligence using only Python stdlib and public data sources.
+Zero dependencies. Zero API keys. Works out of the box.
+
+## Capabilities
+
+- Subdomain discovery via crt.sh certificate transparency logs
+- Live SSL/TLS certificate inspection (expiry, cipher, SANs, TLS version)
+- WHOIS lookup — supports 100+ TLDs via direct TCP queries
+- DNS records: A, AAAA, MX, NS, TXT, CNAME
+- Domain availability check (DNS + WHOIS + SSL signals)
+- Bulk multi-domain analysis in parallel (up to 20 domains)
+
+## Data Sources
+
+- crt.sh — Certificate Transparency logs
+- WHOIS servers — Direct TCP to 100+ authoritative TLD servers  
+- Google DNS-over-HTTPS — MX/NS/TXT/CNAME resolution
+- System DNS — A/AAAA records