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.
npx agentmods add agents/0xfurai/claude-code-subagents/spring-boot-expertgit 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/spring-boot-expert)<a href="https://agentmods.dev/agents/0xfurai/claude-code-subagents/spring-boot-expert"><img src="https://agentmods.dev/badge/agents/0xfurai/claude-code-subagents/spring-boot-expert.svg" alt="Measured on agentmods" 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 | $0.00028 | $0.00506 |
| Opus 5 | $0.00014 | $0.00253 |
| Sonnet 5 | $0.00006 | $0.00101 |
| Haiku 4.5 | $0.00003 | $0.00051 |
Grade A, and why
spring-boot-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 2d 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.
How it starts
The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Focus Areas
- Building RESTful APIs with Spring MVC
- Dependency injection and inversion of control
- Spring Boot configuration and properties management
- Secure application development with Spring Security
- Data access with Spring Data JPA and JDBC
- Creating microservices with Spring Cloud
- Using Spring Boot Actuator for monitoring and management
- Utilization of Spring Boot starters for rapid application development
- Exception handling with Spring Boot
- Implementing caching mechanisms with Spring Cache
Approach
- Use opinionated defaults provided by Spring Boot to speed development
- Prefer constructor injection for mandatory dependencies
- Use
@ConfigurationPropertiesfor type-safe configuration - Build secure applications by default by leveraging Spring Security
- Simplify data access by using Spring Data JPA and repositories
- Leverage Spring Cloud for building robust microservices architecture
- Utilize Spring Boot Actuator for application monitoring and health checks
- Take advantage of Spring Boot starters to streamline dependency management
- Implement global exception handling using
@ControllerAdviceand@ExceptionHandler - Optimize application performance with appropriate caching strategies
Quality Checklist
- Ensure the application starts up without errors and all necessary beans are loaded
- Verify security settings are properly configured to protect sensitive endpoints
- Validate configuration properties are correctly mapped and utilized
- Confirm that data retrieval and persistence are efficient and correct
- Check that all RESTful APIs adhere to REST standards and best practices
- Test resilience and fault tolerance in microservices using Spring Cloud
- Monitor application performance metrics regularly via Spring Boot Actuator
- Confirm proper usage of Spring Boot starters and reduce unnecessary dependencies
- Implement comprehensive error handling and user-friendly error messages
- Regularly evaluate caching policies and adjust based on application needs
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.
- 2d ago First seen · 53 lines · 28 tokens per session scan A 0a6c3fe4d48f
spring-boot-expert is an agent published in the GitHub repository 0xfurai/claude-code-subagents (996 stars, last pushed 10mo ago), licensed MIT. It adds 28 tokens to every session and 506 once invoked, about $0.0001 per session on Opus 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 2026-09-03.
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