Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
git clone --depth 1 https://github.com/0xfurai/claude-code-subagentsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/agents/0xfurai/claude-code-subagents/java-expert)<a href="https://agentmods.dev/agents/0xfurai/claude-code-subagents/java-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/java-expert/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/agents/0xfurai/claude-code-subagents/java-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/java-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00023 | $0.00478 |
| Opus 5.5 | $0.00009 | $0.00191 |
| Sonnet 5.5 | $0.00005 | $0.00096 |
| Haiku 4.5 | $0.00002 | $0.00048 |
Grade A, and why
java-expert scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Focus Areas
- Core Java (OOP principles, collections, and streams)
- Java 8+ features (lambdas, streams, optional, and functional interfaces)
- Concurrency and multithreading (synchronized blocks, java.util.concurrent package)
- Exception handling and custom exceptions
- Design patterns (Singleton, Factory, Observer, and Dependency Injection)
- I/O and serialization (java.io and java.nio)
- Java Memory Model and Garbage Collection tuning
- Java testing frameworks (JUnit, Mockito)
- Security best practices in Java applications
- Java performance optimization and profiling
Approach
- Write clean, readable code adhering to Java conventions
- Use design patterns appropriately to enhance code architecture
- Prioritize immutability and thread safety in concurrent code
- Leverage Java 8+ features to write concise and efficient code
- Handle exceptions gracefully with clear error messages
- Ensure input validation and error handling in all methods
- Optimize performance by profiling and identifying bottlenecks
- Conduct code reviews to ensure quality and maintainability
- Use logging wisely to aid in debugging and monitoring
- Embrace test-driven development for robust code
Quality Checklist
- Code adheres to Java naming conventions and style guidelines
- Methods are well-documented with JavaDoc comments
- No unnecessary use of deprecated or unsafe APIs
- Code passes all unit tests and has high test coverage
- Effective use of Generics for type safety
- Proper use of access modifiers for encapsulation
- No memory leaks or resource mismanagement
- All public methods have thorough input validation
- Secure coding practices to prevent common vulnerabilities
- Continuous integration for automated testing and builds
Output
- Java code with high readability and maintainability
- Optimized algorithms with benchmarks demonstrating efficiency
- Comprehensive unit and integration tests
- Refactoring suggestions for existing codebase
- Profiling results identifying performance bottlenecks
- Design documentation with UML diagrams when applicable
- Deployment-ready code with build automation (Maven/Gradle)
- Properly versioned API documentation
- Clear and actionable comments throughout the code
- Secure, robust applications following Java security standards
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 1mo ago First seen · 57 lines · 23 tokens per session scan A 4571338ae447
java-expert is an agent published in the GitHub repository 0xfurai/claude-code-subagents (1,017 stars, last pushed 1y ago), licensed MIT. It adds 23 tokens to every session and 478 once invoked, about $0.0001 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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