Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/codecast-sh/codecast/domain-searchnpx skills add codecast-sh/codecast --skill domain-searchgit clone --depth 1 https://github.com/codecast-sh/codecastWhat it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00054 | $0.00990 |
| Opus 5 | $0.00027 | $0.00495 |
| Sonnet 5 | $0.00011 | $0.00198 |
| Haiku 4.5 | $0.00005 | $0.00099 |
Grade A, and why
domain-search scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
2. **Find the endpoint** in the IANA bootstrap: `curl -s https://data.iana.org/rdap/dns.json` maps each TLD to its server. A TLD absent from the file has no RDAP; use registry whois. How it starts
The opening of the file, as written. The whole thing — 50 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Domain search
Check availability against registry data, never against parsed whois text alone. Report only verified results, and say which method verified each one.
The one rule that prevents false positives
Every check method must pass a control: a domain you know is registered on the same TLD, through the same route. If the control does not read as "taken", the route is broken and its results are worthless. A broken route returns the same answer as "available" (example failures: rdap.org returns 404 for vine.co, greenhouse.io, and notion.so — all registered). Never report a domain as available from a route with no passing control.
Grepping whois output for "no match" is the classic trap: registrar boilerplate and rate limit text match those patterns. It once reported showtell.com as available when it had been registered since 1995.
Method
- RDAP first. RDAP is the registries' official JSON API. HTTP 200 = registered, 404 = available (on a validated route). Prefer direct registry endpoints over the rdap.org proxy, which is slow and misroutes some TLDs.
- Find the endpoint in the IANA bootstrap:
curl -s https://data.iana.org/rdap/dns.jsonmaps each TLD to its server. A TLD absent from the file has no RDAP; use registry whois. - Registry whois fallback for TLDs without RDAP. Find the server with
whois -h whois.iana.org <tld>(therefer:line), thenwhois -h <server> <domain>. "Domain Name:" present = taken. Still needs a control. - DNS as a fast signal:
dig +short NS <domain>— nameservers present proves registered (absence proves nothing). Parking nameservers (afternic, sedo, bodis, parkingcrew) mean the domain is listed for sale on the aftermarket.
Known endpoints and quirks
| Registry | TLDs | Endpoint | Quirks |
|---|---|---|---|
| Verisign | .com .net | https://rdap.verisign.com/com/v1/domain/X (swap com→net) |
Reliable, fast |
| .app .dev .page .new | https://pubapi.registry.google/rdap/domain/X |
Aggressive rate limits — sleep 5s or more between queries; 429 means retry slower, not "taken" | |
| Identity Digital | .ai .studio .video .show .live .media .tools .pub .wtf and many ngTLDs | https://rdap.identitydigital.services/rdap/domain/X |
Reliable |
| No RDAP | .io .sh .so | whois -h whois.nic.io / whois.nic.sh / whois.nic.so |
rdap.org silently 404s these — never use it for them |
| .co | .co | whois -h whois.registry.co |
Not whois.nic.co; rdap.org misroutes .co |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 3d ago First seen · 50 lines · 54 tokens per session scan A 4e65048df57d
domain-search is a skill published in the GitHub repository codecast-sh/codecast (30 stars, last pushed 3d ago), licensed MIT. It adds 54 tokens to every session and 990 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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