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 jd-opensource/JoySafeter --skill pentest-race-conditionsgit clone --depth 1 https://github.com/jd-opensource/JoySafeterWrote 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/jd-opensource/joysafeter/pentest-race-conditions)<a href="https://agentmods.dev/skills/jd-opensource/joysafeter/pentest-race-conditions"><img src="https://agentmods.dev/badge/skills/jd-opensource/joysafeter/pentest-race-conditions/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/jd-opensource/joysafeter/pentest-race-conditions"><img src="https://agentmods.dev/badge/skills/jd-opensource/joysafeter/pentest-race-conditions.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 | $0.00026 | $0.00536 |
| Opus 5 | $0.00013 | $0.00268 |
| Sonnet 5 | $0.00005 | $0.00107 |
| Haiku 4.5 | $0.00003 | $0.00054 |
Grade A, and why
pentest-race-conditions 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 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
| Shell Concurrency | GNU parallel, xargs, curl | Quick parallel request testing | How it starts
The opening of the file, as written. The whole thing — 47 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Pentest Race Conditions
Purpose
Exploit applications that fail to handle concurrent requests atomically — enabling double-spend, limit bypass, privilege escalation through parallel requests. Absent from standard WSTG categories but critical in real-world assessments.
Prerequisites
Authorization Requirements
- Written authorization with explicit scope for concurrency testing
- Test accounts with balances, quotas, or limited-use resources
- Rollback plan for financial or state-mutating operations
- Rate limit awareness — confirm acceptable burst volume with target owner
Environment Setup
- Burp Suite Professional with Turbo Intruder extension
- Python 3.x with asyncio/aiohttp for parallel request scripting
- GNU parallel or xargs for shell-based concurrency
- Multiple authenticated sessions (separate cookies/tokens)
Core Workflow
- Target Identification: Identify race-prone operations — balance transfers, coupon redemption, inventory purchase, vote/like systems, token generation, file operations.
- Single-Endpoint Races: Send N identical requests simultaneously to bypass "one per user" limits, duplicate transactions (limit-overrun).
- Multi-Endpoint TOCTOU: Exploit time gap between check and use — validate coupon then apply coupon, check balance then debit.
- Session-Level Races: Parallel password change + session refresh, simultaneous role change + action execution.
- Database-Level Races: Exploit missing row-level locks, test optimistic vs pessimistic concurrency, trigger deadlocks.
- Timing Synchronization: Use single-packet attack technique (Turbo Intruder) to synchronize requests within microseconds.
- Impact Documentation: Document financial/operational impact with precise reproduction steps and timing requirements.
Tool Categories
| Category | Tools | Purpose |
|---|---|---|
| Timing Attacks | Turbo Intruder, race-the-web | Microsecond-synchronized parallel requests |
| Async Scripting | Python asyncio/aiohttp, httpx | Custom race condition scripts |
| Shell Concurrency | GNU parallel, xargs, curl | Quick parallel request testing |
| Proxy Analysis | Burp Suite Repeater | Request replay and timing observation |
| Database Monitoring | pg_stat_activity, SHOW PROCESSLIST | Observe lock contention and deadlocks |
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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 · 47 lines · 26 tokens per session scan A 351b26386da5
pentest-race-conditions is a skill published in the GitHub repository jd-opensource/JoySafeter (307 stars, last pushed yesterday), licensed Apache-2.0. It adds 26 tokens to every session and 536 once invoked, about $0.0001 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 2026-08-30.
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