claude-red is a library of structured skills that give Claude specialized offensive-security methods for areas such as web vulnerabilities, shellcode, exploit development, and identity systems. It is intended for authorized red-team work, bug-bounty triage, security research, CTF preparation, and operator training. Its catalogue contains the project's skills for loading these security specializations into Claude.
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/snailsploit/claude-red/offensive-oauthnpx skills add SnailSploit/Claude-Red --skill offensive-oauthgit clone --depth 1 https://github.com/SnailSploit/Claude-RedWrote 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/snailsploit/claude-red/offensive-oauth)<a href="https://agentmods.dev/skills/snailsploit/claude-red/offensive-oauth"><img src="https://agentmods.dev/badge/skills/snailsploit/claude-red/offensive-oauth.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 | $0.00000 | $0.03498 |
| Opus 5 | $0.00000 | $0.01749 |
| Sonnet 5 | $0.00000 | $0.00700 |
| Haiku 4.5 | $0.00000 | $0.00350 |
Grade C, and why
offensive-oauth scanned grade C 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.
Cloud metadata endpointhighServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
- Set redirect_uri to internal service (http://169.254.169.254) How it starts
The opening of the file, as written. The whole thing — 365 lines — stays where its author put it; the contents beside it link to each section on GitHub.
SKILL: OAuth Security Testing
Metadata
- Skill Name: oauth-attacks
- Folder: offensive-oauth
- Source: https://github.com/SnailSploit/offensive-checklist/blob/main/oauth.md
Description
OAuth 2.0 attack checklist: authorization code interception, redirect_uri bypass, CSRF on OAuth flow, state parameter abuse, open redirector chaining, token leakage via Referer, PKCE bypass, and scope escalation. Use when testing OAuth implementations in web apps or bug bounty.
Trigger Phrases
Use this skill when the conversation involves any of:
OAuth, OAuth 2.0, authorization code, redirect_uri bypass, OAuth CSRF, state parameter, PKCE bypass, scope escalation, token leakage, open redirector, OAuth attack
Instructions for Claude
When this skill is active:
- Load and apply the full methodology below as your operational checklist
- Follow steps in order unless the user specifies otherwise
- For each technique, consider applicability to the current target/context
- Track which checklist items have been completed
- Suggest next steps based on findings
Full Methodology
OAuth Security Testing
Shortcut
- Check for improper redirect validation (open redirects)
- Test state parameter manipulation/absence
- Manipulate OAuth flows to bypass authentication
- Try URL path traversal in redirect_uri
- Hunt for client secret leakage in source code/repos
- Look for improper scope validation
Mechanisms
- OAuth 2.0 authorizes limited access to resources via tokens; pair with OIDC for identity.
- Core Flows:
- Authorization Code (with PKCE for public clients)
- Client Credentials (service-to-service)
- Avoid Implicit and ROPC where possible
- Key Components:
- Resource Owner (user)
- Client (third-party app)
- Authorization Server (issues tokens)
- Resource Server (hosts protected resources)
- Tokens (access and refresh)
- Hardening Extensions:
- PAR (Pushed Authorization Requests), JAR (Request Objects), JARM (JWT-secured responses)
- Sender‑constrained tokens (DPoP, mTLS)
private_key_jwtor mTLS client authentication for confidential clients
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 · 365 lines · 0 tokens per session scan C 1202b700fac0
offensive-oauth is a skill published in the GitHub repository SnailSploit/Claude-Red (3,023 stars, last pushed 5d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 3,498 tokens. A static security scan graded it C with 1 finding (cloud metadata endpoint). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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