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 forefy/.context --skill ssrf-oobgit clone --depth 1 https://github.com/forefy/.contextWrote 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/forefy/.context/ssrf-oob)<a href="https://agentmods.dev/skills/forefy/.context/ssrf-oob"><img src="https://agentmods.dev/badge/skills/forefy/.context/ssrf-oob/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/forefy/.context/ssrf-oob"><img src="https://agentmods.dev/badge/skills/forefy/.context/ssrf-oob.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 | $0.00037 | $0.02673 |
| Opus 5 | $0.00018 | $0.01337 |
| Sonnet 5 | $0.00007 | $0.00535 |
| Haiku 4.5 | $0.00004 | $0.00267 |
Grade A, and why
ssrf-oob 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.
import urllib.parse, urllib.request, ssl How it starts
The opening of the file, as written. The whole thing — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Contents
- Scope & authorization
- Step 0 - stand up the collaborator / OAST listener
- Injection points (query params, headers, bulk sweep)
- Port -> scheme logic
- Methodology
- Runnable snippets
- Output
Scope & authorization
Only run against hosts you own or are contractually engaged to test. This check is active and aggressive: it sends live HTTP requests that try to coerce the target into making outbound DNS/HTTP requests to infrastructure you control. Do not point it at third parties.
The whole method is out-of-band: the target's HTTP response usually will not tell you whether SSRF fired. The signal is the interaction (a DNS resolution and/or an HTTP hit) arriving at your callback host. So the OAST listener is the instrument - stand it up first and keep watching it throughout.
Step 0 - stand up the collaborator / OAST listener
You need a host that logs inbound DNS and HTTP and that you can attribute hits back to. Any of these works; they are interchangeable for this method:
- Interactsh (
interactsh-client) - self-hostable, gives you a unique callback domain and a live feed of DNS/HTTP/SMTP hits. - Burp Collaborator - "Copy to clipboard" a payload domain; poll for interactions.
- Your own authoritative DNS + web log - a domain whose NS you control;
tailthe query log and a listener on 80/443.
Call this callback host OAST_HOST below. The core trick: encode who fired the callback into the hostname itself by prefixing a unique label, e.g. dest.OAST_HOST, xforwardedfor.OAST_HOST, or t3-url.OAST_HOST. Because every injection point uses a distinct subdomain label, a single lookup in your OAST feed tells you exactly which param/header on which target reached out - even though the HTTP response was silent.
Injection points
A server-side fetch can be triggered from three places an app commonly trusts. Test all three.
A. Query params - parameters whose value the app treats as a URL/host/path to fetch, follow, or render. Wordlist (24, carry verbatim):
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 Changed · +1 lines 71a764d91cd8
- 9d ago First seen · 143 lines · 37 tokens per session scan A 963475607086
ssrf-oob is a skill published in the GitHub repository forefy/.context (144 stars, last pushed 2d ago), licensed MIT. It adds 37 tokens to every session and 2,673 once invoked, about $0.0002 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.
Other skills, from other repositories
eresus-manual-security-audit
Elite manual security code review skill for deep, adversarial vulnerability hunting and exploit-chain discovery. Trigger when the user asks to: "do a deep security audit", "manual code review", "find exploit chains", "hunt for logic bugs", "red-team this codebase", "do an offensive security review", "review this like…
eresus-sast-scanner
General-purpose Static Application Security Testing (SAST) skill for code vulnerability analysis. Trigger when the user asks to: "analyze code for vulnerabilities", "review code security", "find security bugs", "do a SAST scan", "check for [vulnerability type] in code", "audit source code", or requests a security code…
eresus-php-audit
Deep PHP-specific security audit skill covering injection, deserialization, file operations, auth bypass, POP chain discovery, and CMS-specific patterns. Trigger when auditing PHP code: "audit this PHP app", "find PHP security issues", "check Laravel/WordPress for vulnerabilities", "PHP SAST review", "check for PHP…
eresus-python-audit
Deep Python-specific security audit skill with 50+ vulnerability class coverage across 7 categories. Trigger when auditing Python code: "audit this Python app", "find Python security issues", "check Flask/Django for vulnerabilities", "Python SAST review", "check for pickle vulnerabilities", "review this FastAPI code".…
eresus-remediator
Security remediation skill for fixing confirmed or likely SAST findings in source code. Trigger when the user asks to: "fix a vulnerability", "patch this security bug", "remediate SAST findings", "harden this endpoint", "make this auth flow safe", or wants code changes that remove a confirmed security issue while…
eresus-variant-analysis
GHSA/CVE variant analysis workflow for finding similar vulnerability patterns across a codebase. Trigger when the user asks to: "find variants of this CVE", "GHSA variant analysis", "find similar bugs", "hunt for the same pattern", "are there other places with this vulnerability?", or when a known vulnerability is…