concurrency-review SKILL.md skillA
concurrency-review from decebals/claude-code-java is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add decebals/claude-code-java/concurrency-review@git:20260828.702770aPins git:20260828.702770a in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- decebals/claude-code-java
- Path
skills/concurrency-review/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260828.702770a, committed Aug 28, 2026
- Size
- 12,333 bytes
- Repository stars
- 759
- License
- MIT
Review Java concurrency code for thread safety, race conditions, deadlocks, and modern patterns (Virtual Threads, CompletableFuture, @Async). Use when user asks "check thread safety", "concurrency review", "async code review", or when reviewing multi-threaded code.
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
# Concurrency Review Skill
Review Java concurrent code for correctness, safety, and modern best practices.
## Why This Matters
> Nearly 60% of multithreaded applications encounter issues due to improper management of shared resources. - ACM Study
Concurrency bugs are:
- **Hard to reproduce** - timing-dependent
- **Hard to test** - may only appear under load
- **Hard to debug** - non-deterministic behavior
This skill helps catch issues **before** they reach production.
## When to Use
- Reviewing code with `synchronized`, `volatile`, `Lock`
- Checking `@Async`, `CompletableFuture`, `ExecutorService`
- Validating thread safety of shared state
- Reviewing Virtual Threads / Structured Concurrency code
- Any code accessed by multiple threads
---
## Modern Java (21/25): Virtual Threads
### When to Use Virtual Threads
```java
// ✅ Perfect for I/O-bound tasks (HTTP, DB, file I/O)
try (ExecutorService executor = Executors.newVirtualThreadPerTaskExecutor()) {
for (Request request : requests) {
executor.submit(() -> callExternalApi(request));
}
}
// ❌ Not beneficial for CPU-bound tasks
// Use platform threads / ForkJoinPool instead
```
…Read the whole file at its exact version.
How to install
mdr add decebals/claude-code-java/concurrency-review@sha256:f608137b58bf7fb7The line at the top of this page pins the label git:20260828.702770a, 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_k3quhacu4zxkfgeh)
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Versions
The registry has recorded 1 version of this file, committed on Aug 28, 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 (12333 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
decebals/claude-code-java · 759 stars · license MIT · pushed 2026-09-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_k3quhacu4zxkfgeh GET https://markdownregistry.com/api/v1/resolve?ref=decebals/claude-code-java/concurrency-review GET https://markdownregistry.com/api/v1/blob/f608137b58bf7fb7c1007a318108a14411ae87f73ab42c674b94854704113ea5
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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.