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 sanjaysaini1952/BugBounty-Arsenal --skill prototype-pollutiongit clone --depth 1 https://github.com/sanjaysaini1952/BugBounty-ArsenalWrote 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/sanjaysaini1952/bugbounty-arsenal/prototype-pollution)<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/prototype-pollution"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/prototype-pollution/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/sanjaysaini1952/bugbounty-arsenal/prototype-pollution"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/prototype-pollution.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 | $0.00000 | $0.00250 |
| Opus 5 | $0.00000 | $0.00125 |
| Sonnet 5 | $0.00000 | $0.00050 |
| Haiku 4.5 | $0.00000 | $0.00025 |
Grade A, and why
prototype-pollution 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 12d 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.
Runs shell commandslowCapability
Expected in a hook, worth knowing in a rule or an instructions file.
Chain with template engine or `child_process.exec` gadget. Pollute `shell` or `exec` property. What it actually says
Prototype Pollution Hunting Skill — 4 Test Cases
Load when: prototype pollution, JS prototype,
__proto__,constructor.
252. Basic prototype pollution (medium)
Send {"__proto__":{"isAdmin":true}} in JSON body. Check if new objects have isAdmin: true.
253. Prototype pollution to XSS (hard)
If app uses innerHTML with user-controlled property, pollute toString or valueOf to execute code.
254. Prototype pollution to RCE (hard)
Chain with template engine or child_process.exec gadget. Pollute shell or exec property.
255. Prototype pollution in query string (medium)
Test: ?__proto__[isAdmin]=true in URL. Report if query parser pollutes prototype.
Prototype Pollution Detection
| Test | Expected |
|---|---|
{"__proto__":{"test":"polluted"}} |
New objects have test property |
?__proto__[test]=polluted |
Query parser pollutes prototype |
{"constructor":{"prototype":{"test":"polluted"}}} |
Constructor chain pollution |
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.
- 12d ago First seen · 25 lines · 0 tokens per session scan A d509a9e88b86
prototype-pollution is a skill published in the GitHub repository sanjaysaini1952/BugBounty-Arsenal (2 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 250 tokens. A static security scan graded it A with 1 finding (runs shell commands). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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