Concurrency Review

by decebals

Concurrency Review is a Quality skill for Claude Code, published by decebals in claude-code-java.

714 stars142 forkson decebals/claude-code-javaAdded 2026/08/23+1% in starsRepository updated 2026/02/08

View source on GitHub Download repo ZIP

ai-assisted-developmentclaude-codeclaude-code-skillsdeveloper-toolsjava

Install in seconds

Install Concurrency Review

Copy Concurrency Review into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/decebals/claude-code-java/tree/main/.claude/skills/concurrency-review ~/.claude/skills/concurrency-review

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/decebals/claude-code-java.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: .claude/skills/concurrency-review/SKILL.md in decebals/claude-code-java
Installs to: ~/.claude/skills/concurrency-review
Collection: One of 18 skills cataloged from this repository
Category: Quality — 1354 skills

What Concurrency Review does

Concurrency Review checks Java code for thread safety, race conditions, deadlocks, and async pitfalls. Use it when reviewing multi-threaded code, CompletableFuture, @Async, or modern concurrency patterns.

Concurrency Review is cataloged under Quality on DirSkills. Concurrency Review comes from a repository tagged ai-assisted-development, claude-code, claude-code-skills, developer-tools and java.

Documentation

README

Excerpt

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

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Concurrency Review

What else does decebals publish alongside Concurrency Review?
Concurrency Review is one of 18 skills that DirSkills catalogs from decebals/claude-code-java, the repository it ships in. Its siblings there include API Contract Review, Architecture Review and Changelog Generator. Each one is a separate skill with its own page in this directory, installs the same way Concurrency Review does, and is maintained by decebals in that same repository. The rest of the collection is listed on the decebals/claude-code-java page.
How does Concurrency Review compare to other Quality skills?
Concurrency Review ranks #1034 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Concurrency Review against them. Open each page to compare what they document and how they install.