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 skills add kdr/overcast --skill overcast-attack-surfacegit clone --depth 1 https://github.com/kdr/overcastWrote 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/kdr/overcast/overcast-attack-surface)<a href="https://agentmods.dev/skills/kdr/overcast/overcast-attack-surface"><img src="https://agentmods.dev/badge/skills/kdr/overcast/overcast-attack-surface/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/kdr/overcast/overcast-attack-surface"><img src="https://agentmods.dev/badge/skills/kdr/overcast/overcast-attack-surface.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 5.1 | $0.00044 | $0.01539 |
| Opus 5.5 | $0.00018 | $0.00616 |
| Sonnet 5.5 | $0.00009 | $0.00308 |
| Haiku 4.5 | $0.00004 | $0.00154 |
Grade A, and why
overcast-attack-surface scanned grade A with 0 findings 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 1mo 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 119 lines — stays where its author put it; the contents beside it link to each section on GitHub.
overcast-attack-surface
Use this skill to inventory a target's internet-exposed infrastructure with
Shodan: open ports, products/versions, banners, TLS certs, and known CVEs, keyed
by org, network, hostname, or a single IP. Use the broad overcast skill and
overcast/reference/verbs.md for exact flags.
⚠️ Authorized recon only. Shodan reports real hosts' exposed services and vulnerabilities. Run it only against infrastructure you are permitted to investigate.
shodanis never a default source — you bind it deliberately.
Setup
overcast doctor --sources --json # confirm SHODAN_API_KEY is set
overcast case init --json
overcast case setup --target "<org or domain>" --yes --json
overcast source add 'shodan:org:"<Org Name>"' --json # register the shodan source
Enumerate the surface
Each host hit carries ip/port/transport/org/product/cpe/os/vulns
- geolocation in the payload;
media.refis theshodan.io/host/<ip>report page, so--pullstores a real evidence page. The ad-hoc--queryoverrides the bound ref, so one registered source serves every pivot.
overcast scan --source shodan --limit 25 --pull --json # the bound org query
overcast scan --source shodan --query 'net:<CIDR>' --limit 25 --pull --json # pivot by IP range
overcast scan --source shodan --query 'ssl:<domain>' --limit 25 --pull --json # pivot by TLS certificate
overcast scan --source shodan --query 'hostname:<domain>' --limit 25 --pull --json
overcast scan --source shodan --query '<ip>' --json # deep-dive ONE host: full service map
Useful filters for --query: org:"…", net:<CIDR>, ssl:<domain>,
hostname:<domain>, product:<name>, port:<n>, country:<ISO2>,
vuln:<CVE> (membership). Every service on a host is a distinct hit (the
media.ref/url carry a #<port>-<transport> fragment), so monitor catches
newly exposed ports on an already-seen IP.
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.
- 1mo ago First seen · 119 lines · 44 tokens per session scan A c36088765bd4
overcast-attack-surface is a skill published in the GitHub repository kdr/overcast (17 stars, last pushed 15d ago), licensed Apache-2.0. It adds 44 tokens to every session and 1,539 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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