Individual skill
race-condition-testing
Application-level concurrency abuse - identify race-prone business operations (coupons, payments, withdrawals, quotas, OTP, invites) and synchronize parallel requests with bounded concurrency to prove a duplicated persistent effect: double-spend, limit overrun, duplicate creation, TOCTOU.
internal/tools/skills/data/application-security/race-condition-testing/SKILL.md
Source commit d42f381ad34843e71a42658e5c57290c713e85af
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- Instructions only
- Last checked
- Nov 9, 2026
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- Repository last updated
- Nov 9, 2026
- License
- Apache-2.0
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- cybersecurity Repository topic
- security Repository topic
- bug-bounty Repository topic
- automation Repository topic
- autonomous-pentesting Repository topic
- ai-agent Repository topic
- ai-security Repository topic
- ethical-hacking Repository topic
- golang Repository topic
- penetration-testing Repository topic
- race-condition Declared skill tag
- concurrency Declared skill tag
- toctou Declared skill tag
- double-spend Declared skill tag
- limit-overrun Declared skill tag
- single-packet-attack Declared skill tag
- operations Derived category
- testing Derived category
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SKILL.mdcore · 8,173 bytes
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# Race Condition and Concurrency Testing
## Purpose
Many business invariants ("once per user", "balance cannot go negative", "limited stock") are enforced with check-then-act logic that two near-simultaneous requests defeat. This skill covers WHICH operations are race-prone, HOW to synchronize concurrent requests from inside Xalgorix with bounded concurrency, and WHAT proof looks like (a duplicated persistent effect, never N status codes).
## Entry Conditions
- A state-changing operation whose business rule implies exactly-once or limit enforcement
- The operation can be triggered repeatedly in quick succession within scan policy
## Race-Prone Operation Candidates
- Coupon / discount / gift-card redemption (limit: one per user)