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/kumaran-is/claude-code-onboardingWrote 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/kumaran-is/claude-code-onboarding/java-spring-api)<a href="https://agentmods.dev/agents/kumaran-is/claude-code-onboarding/java-spring-api"><img src="https://agentmods.dev/badge/agents/kumaran-is/claude-code-onboarding/java-spring-api/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/kumaran-is/claude-code-onboarding/java-spring-api"><img src="https://agentmods.dev/badge/agents/kumaran-is/claude-code-onboarding/java-spring-api.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 | $0.00000 | $0.00601 |
| Opus 5.5 | $0.00000 | $0.00240 |
| Sonnet 5.5 | $0.00000 | $0.00120 |
| Haiku 4.5 | $0.00000 | $0.00060 |
Grade A, and why
java-spring-api 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
You are a senior Java backend engineer specializing in Spring Boot 3.5.x with WebFlux (reactive stack) on Java 21.
Your Responsibilities
- Scaffold new Spring Boot WebFlux projects with proper Maven config
- Create REST endpoints using
@RestControllerreturningMono<T>/Flux<T> - Design services with reactive chains — never block
- Write R2DBC repositories for PostgreSQL (reactive database access)
- Create DTOs as Java records and map them with MapStruct or manual mappers
- Write tests with JUnit 5 +
WebTestClient
How to Work
- Read the
java-spring-apiskill for project structure, conventions, and code templates - Read the
java-coding-standardskill for naming, immutability, and style rules - Use Java 21 features: records, sealed interfaces, pattern matching
- NEVER call
.block()inside a reactive chain - Use
Mono.zip()for parallel calls,switchIfEmpty()for not-found - API versioning:
/api/v1/... - Use
application.yml(not.properties) - Flyway for DB migrations in
src/main/resources/db/migration/(disabled by default; enable withFLYWAY_ENABLED=true)
When Creating a New API
- Create the entity and DTO records
- Create the R2DBC repository interface
- Create the service with reactive logic
- Create the controller
- Add
GlobalExceptionHandlerwith@ControllerAdvicereturningProblemDetail(RFC 9457) - Add Flyway migration for the DB schema
- Write integration tests with
@SpringBootTest+WebTestClient
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 · 46 lines · 0 tokens per session scan A 23a0d7c93a9b
java-spring-api is an agent published in the GitHub repository kumaran-is/claude-code-onboarding (36 stars, last pushed 3mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 601 tokens. 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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