Reverse Skill is a routing package for AI coding agents that selects appropriate reverse-engineering, penetration-testing, and security-research methods and tools for a given target. It is used for tasks involving APKs, binaries, frontend JavaScript, packet captures, CTF challenges, and authorized penetration testing. Its catalogue add-ons provide the skills and instructions that guide these workflows.
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 zhaoxuya520/reverse-skill --skill competition-race-condition-state-driftgit clone --depth 1 https://github.com/zhaoxuya520/reverse-skillWrote 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/zhaoxuya520/reverse-skill/competition-race-condition-state-drift)<a href="https://agentmods.dev/skills/zhaoxuya520/reverse-skill/competition-race-condition-state-drift"><img src="https://agentmods.dev/badge/skills/zhaoxuya520/reverse-skill/competition-race-condition-state-drift/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/zhaoxuya520/reverse-skill/competition-race-condition-state-drift"><img src="https://agentmods.dev/badge/skills/zhaoxuya520/reverse-skill/competition-race-condition-state-drift.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 | $0.00105 | $0.00556 |
| Opus 5 | $0.00053 | $0.00278 |
| Sonnet 5 | $0.00021 | $0.00111 |
| Haiku 4.5 | $0.00011 | $0.00056 |
Grade A, and why
competition-race-condition-state-drift 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.
Copies of this mod
4 near-identical copies found in the catalogue:
- competition-race-condition-state-drift — 100% identical, 0 lines differ
- competition-race-condition-state-drift — 100% identical, 0 lines differ
- competition-race-condition-state-drift — 100% identical, 0 lines differ
- competition-race-condition-state-drift — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Competition Race Condition State Drift
Use this skill only as a downstream specialization after $ctf-sandbox-orchestrator is already active and has established sandbox assumptions, node ownership, and evidence priorities. If that has not happened yet, return to $ctf-sandbox-orchestrator first.
Use this skill when the decisive behavior depends on request timing, async ordering, lock gaps, or stale state.
Reply in Simplified Chinese unless the user explicitly requests English.
Quick Start
- Identify mutable state first: rows, cache keys, queue payloads, session fields, counters, or files.
- Reproduce with smallest concurrent sequence and fixed timing assumptions.
- Capture one baseline run and one racing run with only one variable changed.
- Track read, check, write, enqueue, and commit boundaries separately.
- Prove final state drift from a clean reset.
Workflow
1. Map Mutable Boundaries
- Record transaction scope, lock behavior, retry logic, idempotency keys, cache invalidation, and queue handoff.
- Note where read-check-write is split across requests, workers, or services.
- Keep each boundary tied to exact timestamps or sequence numbers.
2. Reproduce Timing Window
- Build deterministic concurrent inputs with controlled delay, duplicate requests, or reordered worker execution.
- Compare accepted and rejected paths under identical payloads.
- Record which condition flips when ordering changes.
3. Reduce To Decisive Race Chain
- Compress to: request A and B ordering -> stale check or lock gap -> conflicting writes -> resulting capability or artifact.
- State whether root cause is missing lock, weak idempotency, stale cache read, delayed async commit, or retry side effect.
- If the path becomes queue-dominant, hand off to queue worker drift skill.
Read This Reference
- Load
references/race-condition-state-drift.mdfor race harness ideas, evidence blocks, and parity checks.
What To Preserve
- Mutable keys, transaction boundaries, lock behavior, and idempotency markers
- Timestamped or sequenced traces for baseline and race runs
- One minimal replayable concurrent sequence proving drift
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.
- 12d ago First seen · 51 lines · 105 tokens per session scan A 94338b6e6354
competition-race-condition-state-drift is a skill published in the GitHub repository zhaoxuya520/reverse-skill (35,402 stars, last pushed 8d ago), licensed MIT. It adds 105 tokens to every session and 556 once invoked, about $0.0005 per session on Opus 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 2026-08-30.
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