argus

A Python security-scanning toolkit for checking web applications, APIs, chatbots, and other language-model features for six classes of bugs, including cross-origin access, header injection, database-query injection, token attacks, blind vulnerabilities, and automated language-model attacks.

In plain words
What is it for?
Use it to scan APIs and websites for CORS and CRLF issues, JSON endpoints for NoSQL injection, JWTs for forgery weaknesses, suspected blind SSRF, XXE, SQL injection, or code execution with out-of-band checks, and chatbots or agents with language-model red-team tests.
Why use it?
It helps find security problems that ordinary scans may miss, including bugs with no visible response. It also groups different checks under one scanning workflow without adding new software dependencies.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/awarexone/agentic-bug-hunter/argus
Any agent
npx skills add Awarexone/Agentic-Bug-Hunter --skill argus
Clone the repo
git clone --depth 1 https://github.com/Awarexone/Agentic-Bug-Hunter

Made for: Claude Code, Codex.

Per session 166 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,943 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00166 $0.01943
Opus 5 $0.00083 $0.00971
Sonnet 5 $0.00033 $0.00389
Haiku 4.5 $0.00017 $0.00194

Measured 3d ago against content hash 5a2803f30da1, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

argus 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.

> `urllib` strips raw `\r\n` from URLs by design — the **encoded** variants are
skills/argus/SKILL.md · 143 lines

How it starts

The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.

ARGUS — THE ALL-SEEING SCANNER SUITE

Named for Argus Panoptes, the hundred-eyed giant. Six "eyes" that surface what ordinary scans miss: two of the most common web2 classes (CORS, CRLF), the NoSQL "db" surface, JWT forging, blind-bug confirmation via OOB (the eye that sees the invisible — unblocks an entire severity band), and automated LLM red-teaming. All pure-Python, no new deps. Core logic is offline-testable.


0. ROUTING — which tool for what

Signal on the target Tool / command
API reflects Origin, or ACAO/ACAC headers seen /cors
Param reaches a redirect / Location / log / response header /crlf
JSON login or {user,pass} body, Mongo/Mongoose stack /nosqli
Authorization: Bearer ey... / JWT in cookie or storage /jwt-scan
Suspected blind SSRF/XXE/SQLi/RCE (no in-band signal) /oob
Chatbot / agent / LLM feature /llm-redteam

1. CORS — /cors

tools/cors_scanner.py https://api.target.com/me --cookie "session=..."
tools/cors_scanner.py -l recon/target.com/urls/api.txt --json

Sends crafted Origin headers, classifies Access-Control-Allow-Origin / Access-Control-Allow-Credentials:

  • CRITICAL — reflects attacker origin with ACAC: true → cookie-auth'd cross-origin read (account-data exfil).
  • HIGHnull origin trusted with credentials.
  • MEDIUM — reflects without creds (exploitable when auth = non-cookie token), or trusts http downgrade.
  • Probes suffix/prefix regex bypass (target.com.evil, notarget.com) and subdomain trust (chains with takeover).

Always pass --cookie with a live session — the credentialed path is the win.

2. CRLF / host-header — /crlf

tools/crlf_scanner.py "https://target.com/r?u=x" --host-header

Injects encoded CRLF (%0d%0a, double-encoded, UTF-8 overlong %E5%98%8A%E5%98%8D) trying to land Set-Cookie: crlftest=1 in the response. --host-header also tests Host / X-Forwarded-Host / Forwarded injection and flags attacker-host reflection in Location (password-reset poisoning). Impact: session fixation, open redirect, cache poisoning, reset poisoning.

Read the full file on GitHub · 143 lines

Changes

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.

  1. 3d ago First seen · 143 lines · 166 tokens per session scan A 5a2803f30da1

Subscribe to this mod's changes

argus is a skill published in the GitHub repository Awarexone/Agentic-Bug-Hunter (4,651 stars, last pushed yesterday), licensed MIT. It adds 166 tokens to every session and 1,943 once invoked, about $0.0008 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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