race-condition-test-author SKILL.md skillA
race-condition-test-author from testland/qa is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add testland/qa/race-condition-test-author@v1.2.14Pins v1.2.14 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- testland/qa
- Path
plugins/qa-concurrency/skills/race-condition-test-author/SKILL.md- Versions recorded
- 5
- Latest version
- v1.2.14, committed Oct 11, 2026
- First version recorded
- Jul 19, 2026
- Size
- 8,511 bytes
- Repository stars
- 11
- License
- MIT
Build deterministic race-condition tests - identify shared mutable state, drive interleavings via barriers / latches / manual scheduling; use ThreadSanitizer (clang `-fsanitize=thread`) for C/C++ data race detection; run the Go race detector end-to-end (`go test -race`, GORACE tuning, `-count`/`-cpu` stress, goroutine-leak gating with go.uber.org/goleak - references/go.md); use jcstress (`@JCStressTest` + `@Actor` + `@Outcome`) for JVM stress; use Loom virtual-thread interleavings for parallel…
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
# race-condition-test-author
Race conditions are the canonical "works on my machine, breaks under
load" bug. Tests must drive shared-state access deterministically
(barriers, latches) AND non-deterministically (sanitizers, stress)
to expose them.
## When to use
- Service handles concurrent requests on shared in-process state
(caches, counters, connection pools).
- Race-condition incident retro: build a regression test before
fixing.
- Pre-release smoke: TSan-instrumented binary catches data races
that compile clean.
## Step 1 - Identify shared mutable state
Code-review checklist:
- Static / global / module-level mutable variables
- Singleton instances with mutable fields
- Cache structures with read-and-modify ("get-then-set" without
CAS)
- Per-request state stored on shared objects (mutable request
context)
- Connection pools / object pools without internal lock
- Lazy-init patterns ("if not initialized, initialize")
For each: ask "what if two threads / goroutines / async tasks hit
this concurrently?"
## Step 2 - Deterministic interleaving via barriers
```python
import threading
def test_lazy_init_thread_safe():
…Read the whole file at its exact version.
How to install
mdr add testland/qa/race-condition-test-author@sha256:a36c706eb0baf87dThe line at the top of this page pins the label v1.2.14, 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_qn56ghszly3v2srj)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 5 versions of this file, between Jul 19, 2026 and Oct 11, 2026, about one every 21 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v1.2.14 latest | 2026-10-11 | a1bd3f7 | 8,511 B | A | view · diff |
| git:20260813.2e5e33b | 2026-08-13 | 2e5e33b | 8,491 B | A | view · diff |
| git:20260724.d4db756 | 2026-07-24 | d4db756 | 7,996 B | A | view · diff |
| git:20260719.53f73b7 | 2026-07-19 | 53f73b7 | 8,105 B | A | view · diff |
| git:20260719.6226ac1 | 2026-07-19 | 6226ac1 | 7,889 B | A | view |
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 (8511 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
testland/qa · 11 stars · license MIT · pushed 2026-10-20 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qn56ghszly3v2srj GET https://markdownregistry.com/api/v1/resolve?ref=testland/qa/race-condition-test-author GET https://markdownregistry.com/api/v1/blob/a36c706eb0baf87d0c73c4cc8f149b164304cd276031bf6e2a3a283d557f2bee
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.