vibe-concurrent-test-safety SKILL.md skillA
vibe-concurrent-test-safety from ash1794/vibe-engineering is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ash1794/vibe-engineering/vibe-concurrent-test-safety@git:20260925.f6554ffPins git:20260925.f6554ff in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ash1794/vibe-engineering
- Path
plugins/vibe-engineering/skills/vibe-concurrent-test-safety/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260925.f6554ff, committed Sep 25, 2026
- Size
- 2,662 bytes
- Repository stars
- 165
- License
- MIT
Audits tests for concurrency safety — race conditions, shared mock state, cleanup ordering. Use when writing tests that involve goroutines, async operations, or shared mutable state.
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
# vibe-concurrent-test-safety
Flaky tests are almost always concurrency bugs in the test, not the code.
## When to Use This Skill
- Writing tests that launch goroutines or async operations
- Tests use shared mock objects accessed by multiple goroutines
- Tests that fail intermittently ("flaky")
- After adding `-race` flag and getting failures
- Tests that involve daemon/server startup and shutdown
## When NOT to Use This Skill
- Purely synchronous tests with no concurrency
- Tests that are already race-free (verified with `-race` flag)
- Simple mock-based tests with single-threaded access
## Common Concurrency Bugs in Tests
### 1. Direct Mock State Access
```go
// BAD: Race condition -- mock.Requests accessed while goroutine writes
go daemon.Run(ctx)
time.Sleep(100 * time.Millisecond)
assert.Equal(t, 3, len(mock.Requests)) // RACE!
// GOOD: Thread-safe accessor
go daemon.Run(ctx)
time.Sleep(100 * time.Millisecond)
assert.Equal(t, 3, mock.RequestCount()) // Safe
```
### 2. Missing Context Cancellation Before Cleanup
```go
// BAD: Close bus while daemon goroutine still using it
go daemon.Run(ctx)
defer bus.Close() // daemon may still be writing!
…Read the whole file at its exact version.
How to install
mdr add ash1794/vibe-engineering/vibe-concurrent-test-safety@sha256:037799cff1a62052The line at the top of this page pins the label git:20260925.f6554ff, 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_qeegy3xrli6maqcj)
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Versions
The registry has recorded 1 version of this file, committed on Sep 25, 2026.
Audit of the latest version
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- pass: Frontmatter declares a description
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- 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
ash1794/vibe-engineering · 165 stars · license MIT · pushed 2026-10-07 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_qeegy3xrli6maqcj GET https://markdownregistry.com/api/v1/resolve?ref=ash1794/vibe-engineering/vibe-concurrent-test-safety GET https://markdownregistry.com/api/v1/blob/037799cff1a620520e024847929adfde22e6e38fb2dd1d24beda276b1e9967f4
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