Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/Mikacr1138/claude-bug-bountynpx agentmods add skills/mikacr1138/claude-bug-bounty/bug-bountyWrote 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/mikacr1138/claude-bug-bounty/bug-bounty)<a href="https://agentmods.dev/skills/mikacr1138/claude-bug-bounty/bug-bounty"><img src="https://agentmods.dev/badge/skills/mikacr1138/claude-bug-bounty/bug-bounty/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/mikacr1138/claude-bug-bounty/bug-bounty"><img src="https://agentmods.dev/badge/skills/mikacr1138/claude-bug-bounty/bug-bounty.svg" alt="Reviewed on agentmods" width="80" 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 5.1 | $0.00323 | $0.13132 |
| Opus 5 | $0.00161 | $0.06566 |
| Sonnet 5 | $0.00065 | $0.02626 |
| Haiku 4.5 | $0.00032 | $0.01313 |
Grade C, and why
bug-bounty scanned grade C with 5 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Instruction-override phrasingmediumPrompt injection
Text telling the model to disregard its earlier instructions or safety rules is the shape of a prompt injection, whoever wrote it.
| ASI01 | Prompt injection | Override system prompt via user input -- make agent ignore its rules | Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Sends data to an external URLlowData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
curl -s -X PUT "https://TARGET-APP.firebaseio.com/test.json" -d '"pwned"' Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Cloud metadata endpointmediumServer-side request forgery
One request to 169.254.169.254 can return temporary IAM credentials.
| SSRF (any) | Cloud metadata 169.254.169.254 | IAM credential exfil -> RCE | Downgraded: this mod is about security review, or the phrase is quoted, so it is likely naming the pattern rather than instructing it.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
code=$(curl -s -o /dev/null -w "%{http_code}" "https://${TARGET}-${suffix}.s3.amazonaws.com/") Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
grep -rn "eval(\|innerHTML\|dangerouslySetInner\|execSync" --include="*.ts" --include="*.js" | grep -v node_modules This is a copy
95% identical to bug-bounty — 8 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 1,222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Bug Bounty Master Workflow
Full pipeline: Recon -> Learn -> Hunt -> Validate -> Report. One skill for everything.
THE ONLY QUESTION THAT MATTERS
"Can an attacker do this RIGHT NOW against a real user who has taken NO unusual actions -- and does it cause real harm (stolen money, leaked PII, account takeover, code execution)?"
If the answer is NO -- STOP. Do not write. Do not explore further. Move on.
Theoretical Bug = Wasted Time. Kill These Immediately:
| Pattern | Kill Reason |
|---|---|
| "Could theoretically allow..." | Not exploitable = not a bug |
| "An attacker with X, Y, Z conditions could..." | Too many preconditions |
| "Wrong implementation but no practical impact" | Wrong but harmless = not a bug |
| Dead code with a bug in it | Not reachable = not a bug |
| Source maps without secrets | No impact |
| SSRF with DNS-only callback | Need data exfil or internal access |
| Open redirect alone | Need ATO or OAuth chain |
| "Could be used in a chain if..." | Build the chain first, THEN report |
You must demonstrate actual harm. "Could" is not a bug. Prove it works or drop it.
CRITICAL RULES
- READ FULL SCOPE FIRST -- verify every asset/domain is owned by the target org
- NO THEORETICAL BUGS -- "Can an attacker steal funds, leak PII, takeover account, or execute code RIGHT NOW?" If no, STOP.
- KILL WEAK FINDINGS FAST -- run the 7-Question Gate BEFORE writing any report
- Validate before writing -- check CHANGELOG, design docs, deployment scripts FIRST
- One bug class at a time -- go deep, don't spray
- Verify data isn't already public -- check web UI in incognito before reporting API "leaks"
- 5-MINUTE RULE -- if a target shows nothing after 5 min probing (all 401/403/404), MOVE ON
- IMPACT-FIRST HUNTING -- ask "what's the worst thing if auth was broken?" If nothing valuable, skip target
- CREDENTIAL LEAKS need exploitation proof -- finding keys isn't enough, must PROVE what they access
- STOP SHALLOW RECON SPIRALS -- don't probe 403s, don't grep for analytics keys, don't check staging domains that lead nowhere
- BUSINESS IMPACT over vuln class -- severity depends on CONTEXT, not just vuln type
- UNDERSTAND THE TARGET DEEPLY -- before hunting, learn the app like a real user
- DON'T OVER-RELY ON AUTOMATION -- automated scans hit WAFs, trigger rate limits, find the same bugs everyone else finds
- HUNT LESS-SATURATED VULN CLASSES -- XSS/SSRF/XXE have the most competition. Expand into: cache poisoning, Android/mobile vulns, business logic, race conditions, OAuth/OIDC chains, CI/CD pipeline attacks
- ONE-HOUR RULE -- stuck on one target for an hour with no progress? SWITCH CONTEXT
- TWO-EYE APPROACH -- combine systematic testing (checklist) with anomaly detection (watch for unexpected behavior)
- T-SHAPED KNOWLEDGE -- go DEEP in one area and BROAD across everything else
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.
- 11d ago First seen · 1,222 lines · 323 tokens per session scan C 0416ecfa1a70
bug-bounty is a skill published in the GitHub repository Mikacr1138/claude-bug-bounty (2 stars, last pushed today), licensed MIT. It adds 323 tokens to every session and 13,132 once invoked, about $0.0016 per session on Opus 5. A static security scan graded it C with 5 findings (instruction-override phrasing, sends data to an external url, cloud metadata endpoint). It is 95% identical to bug-bounty, differing in 8 lines, and is treated as a copy.
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