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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, structured concurrency, scoped values, backpressure, cancellation discipline, and observability for concurrent systems. This should trigger for requests such as Review Java code for concurrency; Review Java code for thread safety; Fix race conditions in Java concurrency code; Choose ExecutorService or virtual threads in Java; Improve synchronization and shared mutable state handling; Apply structured concurrency for related Java subtasks. Part of Plinth Toolkit

67

Quality

Does it follow best practices?

Impact

No eval scenarios have been run

SecuritybySnyk

Passed

No known issues

SKILL.md
Quality
Evals
Security

Quality

Content

70%

Reviews the quality of instructions and guidance provided to agents. Good implementation is clear, handles edge cases, and produces reliable results.

A well-structured overview skill with clear validation checkpoints and clean one-level-deep reference navigation. It loses points on conciseness (a redundant scope list) and actionability (the core implementation step is vague and deferred).

Suggestions

Collapse the 'What is covered' list so it does not duplicate the description's enumeration, or move the detailed list into the reference.

Make the workflow's 'Apply concurrency improvements' step more concrete, e.g. name the specific good/bad example sections in the reference to consult per issue type.

Consider a short in-body checklist mapping common symptoms (race condition, deadlock, pinning) to reference sections for faster routing.

DimensionReasoningScore

Conciseness

The body is mostly efficient and teaches no basic concepts, but the 16-item 'What is covered' list largely restates the description's enumeration and could be tightened to save tokens.

2 / 3

Actionability

Concrete commands and API names are present ('./mvnw compile', 'StructuredTaskScope', 'Executors.newVirtualThreadPerTaskExecutor()'), but the core step 'Implement suitable concurrency patterns' is vague and defers all executable detail to the reference.

2 / 3

Workflow Clarity

The four-step workflow is clearly sequenced with explicit validation checkpoints — compile-before (stop on failure) and verify-after — and the Constraints section reinforces the blocking feedback loop.

3 / 3

Progressive Disclosure

The body is a concise overview pointing to a single, clearly signaled one-level-deep reference (references/125-java-concurrency.md, which exists), with content appropriately split and easy navigation.

3 / 3

Total

10

/

12

Passed

Description

90%

Based on the skill's description, can an agent find and select it at the right time? Clear, specific descriptions lead to better discovery.

A strong, comprehensive description with explicit what-and-when triggers and a distinct Java concurrency niche. Its only weakness is mild verbosity and the second-person 'you need to apply' framing in the trigger clause.

Suggestions

Rephrase the opening to third person to match the canonical trigger form, e.g. 'Use when applying Java concurrency best practices' instead of 'Use when you need to apply'.

Trim the long topic enumeration slightly to reduce verbosity while keeping the most distinctive capabilities.

DimensionReasoningScore

Specificity

The description enumerates a comprehensive, concrete set of concurrency topics ('thread safety fundamentals, ExecutorService thread pool management ... CompletableFuture ... virtual threads'), but opens with the second-person trigger 'Use when you need to apply', which the rubric penalizes by reducing specificity by one.

2 / 3

Completeness

It clearly answers both what ('apply Java concurrency best practices — including ...') and when (a 'Use when ...' clause plus six concrete 'should trigger for' requests).

3 / 3

Trigger Term Quality

Explicit trigger phrases like 'Review Java code for concurrency', 'Review Java code for thread safety', and 'Fix race conditions in Java concurrency code' are natural wording a user would say, giving strong coverage.

3 / 3

Distinctiveness Conflict Risk

The Java concurrency niche with dedicated triggers ('Choose ExecutorService or virtual threads in Java', 'Apply structured concurrency') is clearly distinguishable and unlikely to fire for unrelated skills.

3 / 3

Total

11

/

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.

Validation16 / 16 Passed

Validation for skill structure

No warnings or errors.

Repository
jabrena/plinth
Reviewed

Table of Contents

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