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 Miosa-osa/OSA --skill offensive-race-conditiongit clone --depth 1 https://github.com/Miosa-osa/OSAWrote 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/miosa-osa/osa/offensive-race-condition)<a href="https://agentmods.dev/skills/miosa-osa/osa/offensive-race-condition"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-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/miosa-osa/osa/offensive-race-condition"><img src="https://agentmods.dev/badge/skills/miosa-osa/osa/offensive-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 | $0.00066 | $0.00471 |
| Opus 5.5 | $0.00026 | $0.00188 |
| Sonnet 5.5 | $0.00013 | $0.00094 |
| Haiku 4.5 | $0.00007 | $0.00047 |
Grade A, and why
offensive-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 1mo 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
SKILL: Race Conditions
Metadata
- Skill Name: race-condition
- Folder: offensive-race-condition
- Source: https://github.com/SnailSploit/offensive-checklist/blob/main/race-condition.md
Description
Race condition (TOCTOU) testing checklist: identifying timing windows, Burp Suite Turbo Intruder, Last-Byte sync technique, rate limit bypass, double-spend attacks, and concurrent request exploitation. Use for web app race condition testing or bug bounty time-of-check-to-time-of-use bugs.
Trigger Phrases
Use this skill when the conversation involves any of:
race condition, TOCTOU, timing attack, Turbo Intruder, last-byte sync, rate limit bypass, double spend, concurrent request, race window, time of check, time of use
Methodology references
Read the relevant sections below before following a technique. Read them in order for the complete original methodology. Confirm the target and testing scope with the user before performing any active checks.
- Full Methodology — part 1; consult for this stage and its examples.
- Database Isolation Level Testing — part 2; consult for this stage and its examples.
- Testing Strategies — part 3; consult for this stage and its examples.
What ships with it
3 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.
- 1mo ago Changed · -863 lines scan B → A 41386c68e477
- 1mo ago First seen · 913 lines · 66 tokens per session scan B 5fd2add117fb
offensive-race-condition is a skill published in the GitHub repository Miosa-osa/OSA (78 stars, last pushed 11d ago), licensed Apache-2.0. It adds 66 tokens to every session and 471 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-09-14.
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