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 race-conditiongit 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/race-condition)<a href="https://agentmods.dev/skills/sanjaysaini1952/bugbounty-arsenal/race-condition"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/race-condition/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/race-condition"><img src="https://agentmods.dev/badge/skills/sanjaysaini1952/bugbounty-arsenal/race-condition.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 | $0.00407 |
| Opus 5 | $0.00000 | $0.00204 |
| Sonnet 5 | $0.00000 | $0.00081 |
| Haiku 4.5 | $0.00000 | $0.00041 |
Grade A, and why
race-condition scanned grade A with 0 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 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Race Condition Hunting Skill — 8 Test Cases
Load when: race condition, TOCTOU, time-of-check time-of-use, concurrent request.
140. Race condition in fund transfer (medium)
Send 10 simultaneous transfer requests (same amount, same account). Check if balance allows multiple transfers beyond available funds.
141. Race in coupon redemption (medium)
Send simultaneous requests to redeem same coupon code. Check if used once or multiple times.
142. Race in OTP verification (medium)
Send parallel OTP verification requests. Check if multiple attempts bypass rate limiting.
143. Race in inventory (medium)
Send concurrent add-to-cart or purchase requests for limited stock. Check overselling.
144. Race in token generation (medium)
Request password reset or API tokens simultaneously. Check if multiple valid tokens are generated (only last should be valid).
145. Race in account creation (medium)
Create same user simultaneously. Check if duplicate accounts or inconsistent state results.
146. Race in multi-step process (hard)
In workflows (checkout, onboarding), send intermediate steps out of order or concurrently. Check state inconsistencies.
147. Race in file operations (hard)
Upload and delete same file simultaneously. Check for TOCTOU vulnerability (file exists check vs. actual operation).
Testing Methodology
- Identify state-changing endpoints
- Use multiple threads (Turbo Intruder, Burp Group Send, custom script)
- Send 10-50 concurrent requests
- Analyze response for anomalies
- Check state after race (balance, count, state)
- Verify reproducibility
- Document with timestamps and evidence
Race Detection Heuristics
| Signal | Description |
|---|---|
| Balance anomaly | More transfers than balance allows |
| Duplicate resources | Two users with same username |
| Count mismatch | Counter says 5, actual items 7 |
| State corruption | Mixed/invalid state in database |
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 · 47 lines · 0 tokens per session scan A 0b48041350bf
race-condition 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 407 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
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