Agent Skill
Hunt Oauth skill
hunt-oauthelementalsouls/Claude-BugHunterskills/hunt-oauth/SKILL.md
Hunting skill for oauth vulnerabilities. Built from 19 public bug bounty reports. Use when hunting oauth on any target.
always on
27 tokname + description
once used
6,615 tokSKILL.md body
bundled files
0
repo stars
5.2kGitHub
Install the Hunt Oauth skill
Skills CLI (Claude Code, Codex, Cursor and others)
npx skills add https://github.com/elementalsouls/Claude-BugHunter --skill hunt-oauth
Claude Code, by hand (all projects)
git clone --depth 1 https://github.com/elementalsouls/Claude-BugHunter.git /tmp/Claude-BugHunter mkdir -p ~/.claude/skills cp -R /tmp/Claude-BugHunter/skills/hunt-oauth ~/.claude/skills/hunt-oauth
For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.
What it costs your context
Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.
| When | What loads | Cost |
|---|---|---|
| Every session | Name and description | 27 tok |
| When the agent uses it | The SKILL.md instructions | 6,615 tok |
| Only if opened | No bundled files | — |
Until it is used, hunt-oauth costs about 50× less than the median MCP server we measured (1,362 tokens on every turn). Installing all 83 skills from elementalsouls/Claude-BugHunter would load 12,248 tokens of descriptions. Skills vs MCP study
Checks
- The instructions are over 5,000 tokens, the Agent Skills specification's guideline for SKILL.md.
Checked 2026-10-22 · method
What's inside
The headings of its SKILL.md. Read the full file on GitHub.
- Crown Jewel Targets
- Attack Surface Signals
- URL Patterns to Hunt
- Response Headers That Signal OAuth
- JavaScript Patterns (grep in JS bundles)
- Tech Stack Signals
- Step-by-Step Hunting Methodology
- Payload & Detection Patterns
- redirecturi Bypass Payloads
- State CSRF Test
- Nonce Extraction via Referrer
- Mobile Deep Link Exploit (Android)
- Token Endpoint Auth Bypass
- Grep Patterns for Recon
- OIDC Discovery & Dynamic Registration Abuse
- Cross-Client Token Confusion
- OIDC prompt=none Silent Re-Auth Test
- Common Root Causes
- Bypass Techniques
- Defender: Exact-match redirecturi whitelist
- Defender: state parameter required
- Defender: Fragment-only token delivery (responsetype=token)
- Defender: Host validation on mobile deep links
- Defender: Short-lived authorization codes
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