125-java-concurrency
Use when you need to apply Java concurrency best practices — including thread safety fundamentals, ExecutorService thread pool management, concurrent design patterns like Producer-Consumer, asynchronous programming with CompletableFuture, immutability and safe publication, deadlock avoidance, virtual threads, scoped values, backpressure, cancellation discipline, and observability for concurrent systems. Part of the skills-for-java project
88
85%
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
Passed
No known issues
Quality
Discovery
100%Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.
This is a strong skill description that excels across all dimensions. It provides comprehensive coverage of Java concurrency topics with specific, actionable terminology that developers would naturally use. The explicit 'Use when' clause at the beginning and the detailed enumeration of capabilities make it highly effective for skill selection.
| Dimension | Reasoning | Score |
|---|---|---|
Specificity | Lists multiple specific concrete actions and concepts: thread safety fundamentals, ExecutorService thread pool management, Producer-Consumer pattern, CompletableFuture, immutability, deadlock avoidance, virtual threads, scoped values, backpressure, cancellation discipline, and observability. | 3 / 3 |
Completeness | Explicitly answers both what (Java concurrency best practices with detailed list of topics) and when ('Use when you need to apply Java concurrency best practices') with clear trigger guidance at the start of the description. | 3 / 3 |
Trigger Term Quality | Excellent coverage of natural terms users would say: 'thread safety', 'ExecutorService', 'thread pool', 'Producer-Consumer', 'CompletableFuture', 'deadlock', 'virtual threads', 'concurrency', 'async' concepts. These are terms Java developers naturally use when seeking concurrency help. | 3 / 3 |
Distinctiveness Conflict Risk | Highly distinctive with Java-specific concurrency terminology (ExecutorService, CompletableFuture, virtual threads, scoped values). Unlikely to conflict with general programming skills or other language-specific skills due to explicit Java focus and specialized concurrency terms. | 3 / 3 |
Total | 12 / 12 Passed |
Implementation
70%Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.
This skill provides good structure and workflow clarity with explicit validation checkpoints, but relies heavily on the reference file for actual actionable content. The extensive topic list in 'What is covered' adds tokens without providing executable guidance, making it more of an index than a standalone skill. The constraint section is well-designed with clear blocking conditions.
Suggestions
Add 1-2 concrete code examples of the most common patterns (e.g., ExecutorService setup or CompletableFuture composition) directly in the skill to improve actionability
Trim the 'What is covered' bullet list to 5-7 key categories, since detailed patterns are in the reference file anyway
Consider adding a 'Quick reference' section with the most frequently needed patterns inline to reduce round-trips to the reference file
| Dimension | Reasoning | Score |
|---|---|---|
Conciseness | The skill lists many topics comprehensively but the 'What is covered' section is essentially a verbose table of contents that could be trimmed. The bullet list is informative but somewhat redundant given the reference file exists. | 2 / 3 |
Actionability | Provides concrete commands for compilation/verification but lacks any executable code examples in the skill itself. All actual code patterns are deferred to the reference file, making this more of a pointer than actionable guidance. | 2 / 3 |
Workflow Clarity | Clear workflow with explicit validation checkpoints: compile first (blocking condition), apply changes, then verify. The MANDATORY/SAFETY/VERIFY structure provides explicit sequencing with error handling. | 3 / 3 |
Progressive Disclosure | Excellent structure with a clear overview, well-organized sections, and a single-level reference to the detailed guidance file. The skill serves as an effective entry point without being monolithic. | 3 / 3 |
Total | 10 / 12 Passed |
Validation
100%Checks the skill against the spec for correct structure and formatting. All validation checks must pass before discovery and implementation can be scored.
Validation — 11 / 11 Passed
Validation for skill structure
No warnings or errors.
- Repository
- jabrena/cursor-rules-java
- Commit
7772a1b
- Reviewed
Table of Contents
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