detecting-race-conditions SKILL.md skillA
detecting-race-conditions from unboundcompute/security-agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add unboundcompute/security-agent-skills/detecting-race-conditions@git:20260816.faa9c07Pins git:20260816.faa9c07 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- unboundcompute/security-agent-skills
- Path
skills/detecting-race-conditions/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260816.faa9c07, committed Aug 16, 2026
- Size
- 5,848 bytes
- Repository stars
- 26
- License
- MIT
Find concurrency and time-of-check/time-of-use bugs - TOCTOU, unsynchronized shared state, check-then-act, and atomicity violations - by reasoning about what state is shared, what can interleave, and where a window opens between a check and its use. Use on an authorized source target when the risk is ordering, not a single tainted value; when reviewing multithreaded code, shared caches/counters, filesystem checks, or "verify then act" sequences (balance checks, auth-then-use, dedup guards).…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Detecting race conditions Race bugs don't live in one line - they live in the *gap* between two operations that another actor can slip through. There's no tainted value to trace and no single sink to grep; you find them by asking what state is shared, what runs concurrently, and where a window opens between deciding something and acting on it. This skill covers the recurring shapes and how to confirm a real window. ## When to use - Multithreaded / async / multiprocess code, or a shared resource (DB row, cache, counter, file, in-memory map) touched by concurrent requests. - A "check then act" sequence where the check's truth can expire before the act: balance/quota checks, auth-then-use, uniqueness/dedup guards, file existence checks, one-time tokens. ## Scope check Authorized source only. If you can't name the authorization, stop. ## The shapes and how to confirm each Confirmation of a race is an **interleaving witness**: two concrete operation orders where one is safe and the other, achievable by an attacker, is not. 1. **TOCTOU (time-of-check to time-of-use).** State is validated, then used, and …
Read the whole file at its exact version.
How to install
mdr add unboundcompute/security-agent-skills/detecting-race-conditions@sha256:847e5e6b72561664The line at the top of this page pins the label git:20260816.faa9c07, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_dvttcsr5yekw6br4)
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Versions
The registry has recorded 1 version of this file, committed on Aug 16, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5848 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
unboundcompute/security-agent-skills · 26 stars · license MIT · pushed 2026-09-08 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_dvttcsr5yekw6br4 GET https://markdownregistry.com/api/v1/resolve?ref=unboundcompute/security-agent-skills/detecting-race-conditions GET https://markdownregistry.com/api/v1/blob/847e5e6b72561664aefae3ea0a5a1927aeff34ce335ef861da26e48a81369dae
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.