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/securitytalent/bugskill-ai/apexdiscoverynpx skills add SecurityTalent/bugskill-ai --skill apexdiscoverygit clone --depth 1 https://github.com/SecurityTalent/bugskill-aiWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/securitytalent/bugskill-ai/apexdiscovery)<a href="https://agentmods.dev/skills/securitytalent/bugskill-ai/apexdiscovery"><img src="https://agentmods.dev/badge/skills/securitytalent/bugskill-ai/apexdiscovery.svg" alt="Measured on agentmods" height="20"></a>What 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 | $0.00058 | $0.02901 |
| Opus 5 | $0.00029 | $0.01451 |
| Sonnet 5 | $0.00012 | $0.00580 |
| Haiku 4.5 | $0.00006 | $0.00290 |
Grade A, and why
ApexDiscovery 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 5d 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.
curl -s "https://crt.sh/?O=Acme+Corporation&output=json" | \ How it starts
The opening of the file, as written. The whole thing — 359 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ApexDiscovery
Discover all apex/root domains owned by a target organization using multiple techniques.
Philosophy:
"For every apex domain you find, you 4x your chance of hacking the target." — Jason Haddix
Why this matters: Companies own many domains — acquisitions, regional sites, product brands, internal tools. Subdomain enumeration only works on domains you know about. This skill finds the domains you don't.
Important: Organization Name Discovery
During recon, you'll often discover additional organization names that should be searched:
- WHOIS shows "Tesla Motors Inc" but ASN shows "Tesla Energy"
- ASN data reveals acquired company "SolarCity"
- Cert org field shows "Acme Holdings LLC" (parent company)
The workflow should be ITERATIVE:
- Search initial org name
- Collect any NEW org names discovered
- Present to user: "Found these related orgs: X, Y, Z. Search them too?"
- If yes → recursive search on new orgs
- Repeat until no new orgs found
Where new orgs appear:
| Source | Field to Check |
|---|---|
| WHOIS | Registrant Organization |
| ASN (bgp.he.net) | AS Organization Name |
| Certificates | O= (Organization) field |
| DomLink | Company Names section |
Workflow Routing
| Workflow | Trigger | What It Does |
|---|---|---|
| Quick | "find related domains", "apex discovery", DEFAULT | Reverse WHOIS + crt.sh org search |
| Full | "full apex discovery", "all company domains", "complete domain footprint" | All techniques in parallel |
| Microsoft | "Microsoft tenant", "M365 domains", "Azure domains" | tenant-domains only |
Techniques Overview
| # | Technique | Tool | API Key Required | Coverage |
|---|---|---|---|---|
| 1 | Reverse WHOIS | knockknock + DomLink | Yes (whoxy) | Excellent |
| 2 | Microsoft Tenant | tenn.sh | No | M365/Azure orgs |
| 3 | ASN Discovery | AsnRecon skill | No | IP-based infra |
| 4 | ASN → Reverse DNS | AsnRecon skill | No | Domains on IP space |
| 5 | Cert Transparency (Org) | crt.sh | No | Good |
| 6 | Amass Intel | amass intel -whois | Optional | Good |
| 7 | Google Dorking | Manual/Script | No | Variable |
| 8 | Acquisitions Research | Crunchbase/Wikipedia | No | Manual |
What ships with it
2 files 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.
- 5d ago First seen · 359 lines · 58 tokens per session scan A 184884814fbd
ApexDiscovery is a skill published in the GitHub repository SecurityTalent/bugskill-ai (5 stars, last pushed 19d ago), licensed MIT. It adds 58 tokens to every session and 2,901 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 2026-08-31.
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