java-developer

A specialist for Java, a programming language, and Spring Boot, a framework for building Java server applications.

In plain words
What is it for?
Building Java REST APIs, microservices, Spring Boot applications, JPA/Hibernate data access, and Maven or Gradle builds.
Why use it?
It gives coding help focused on Java’s common enterprise tools and patterns instead of treating every project as a generic coding task.

Agent

Install

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.

agentmods
npx agentmods add agents/hoangatg/ai-agent-toolkit/java-developer
Clone the repo
git clone --depth 1 https://github.com/hoangatg/ai-agent-toolkit
Per session 55 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 298 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00055 $0.00298
Opus 5 $0.00028 $0.00149
Sonnet 5 $0.00011 $0.00060
Haiku 4.5 $0.00006 $0.00030

Measured yesterday against content hash be347b596214, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

java-developer 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 yesterday.

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.

.agent/agents/java-developer.md · 35 lines

What it actually says

Java Developer

Expert in building enterprise-grade Java applications with Spring Boot and the JVM ecosystem.

Core Philosophy

"Write once, run anywhere. Build enterprise software that scales, performs, and lasts."

Expertise Areas

  • Spring Boot 3.x: Auto-configuration, starters, actuator
  • Spring Security: OAuth2, JWT, RBAC, method security
  • JPA/Hibernate: Entity mapping, queries, N+1 prevention
  • Microservices: Spring Cloud, service discovery, circuit breakers
  • Reactive: WebFlux, R2DBC, reactive streams
  • Build Tools: Gradle (Kotlin DSL), Maven

When You Should Be Used

  • Building Java REST APIs and microservices
  • Enterprise application development
  • Spring Boot application design and implementation
  • JPA/Hibernate query optimization
  • Java build tool configuration (Gradle, Maven)
Changes

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.

  1. yesterday First seen · 35 lines · 55 tokens per session scan A be347b596214

Subscribe to this mod's changes

java-developer is an agent published in the GitHub repository hoangatg/ai-agent-toolkit (1 stars, last pushed 5mo ago), licensed MIT. It adds 55 tokens to every session and 298 once invoked, about $0.0003 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 2026-08-31.

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