claude-skills is a collection of specialized skills that extends Claude Code for full-stack development. Developers use it for programming languages, frameworks, infrastructure, APIs, testing, DevOps, security, data and machine learning, platform tasks, and project workflows.
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 skills add Jeffallan/claude-skills --skill spring-boot-engineergit clone --depth 1 https://github.com/Jeffallan/claude-skillsWrote 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/skills/jeffallan/claude-skills/spring-boot-engineer)<a href="https://agentmods.dev/skills/jeffallan/claude-skills/spring-boot-engineer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/spring-boot-engineer/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/skills/jeffallan/claude-skills/spring-boot-engineer"><img src="https://agentmods.dev/badge/skills/jeffallan/claude-skills/spring-boot-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- Socket pass
- Snyk pass
- NVIDIA SkillSpector pass
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 | $0.00091 | $0.01602 |
| Opus 5 | $0.00046 | $0.00801 |
| Sonnet 5 | $0.00018 | $0.00320 |
| Haiku 4.5 | $0.00009 | $0.00160 |
Grade A, and why
spring-boot-engineer 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 9d 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.
Copies of this mod
2 near-identical copies found in the catalogue:
- spring-boot-engineer — 97% identical, 2 lines differ
- spring-boot-engineer — 97% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 198 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Spring Boot Engineer
Core Workflow
- Analyze requirements — Identify service boundaries, APIs, data models, security needs
- Design architecture — Plan microservices, data access, cloud integration, security; confirm design before coding
- Implement — Create services with constructor injection and layered architecture (see Quick Start below)
- Secure — Add Spring Security, OAuth2, method security, CORS configuration; verify security rules compile and pass tests. If compilation or tests fail: review error output, fix the failing rule or configuration, and re-run before proceeding
- Test — Write unit, integration, and slice tests; run
./mvnw test(or./gradlew test) and confirm all pass before proceeding. If tests fail: review the stack trace, isolate the failing assertion or component, fix the issue, and re-run the full suite - Deploy — Configure health checks and observability via Actuator; validate
/actuator/healthreturnsUP. If health isDOWN: check thecomponentsdetail in the response, resolve the failing component (e.g., datasource, broker), and re-validate
Reference Guide
Load detailed guidance based on context:
| Topic | Reference | Load When |
|---|---|---|
| Web Layer | references/web.md |
Controllers, REST APIs, validation, exception handling |
| Data Access | references/data.md |
Spring Data JPA, repositories, transactions, projections |
| Security | references/security.md |
Spring Security 6, OAuth2, JWT, method security |
| Cloud Native | references/cloud.md |
Spring Cloud, Config, Discovery, Gateway, resilience |
| Testing | references/testing.md |
@SpringBootTest, MockMvc, Testcontainers, test slices |
Quick Start — Minimal Working Structure
A standard Spring Boot feature consists of these layers. Use these as copy-paste starting points.
Entity
@Entity
@Table(name = "products")
public class Product {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
@NotBlank
private String name;
@DecimalMin("0.0")
private BigDecimal price;
// getters / setters or use @Data (Lombok)
}
What ships with it
5 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 198 lines · 91 tokens per session scan A 6dcc68c578ad
spring-boot-engineer is a skill published in the GitHub repository Jeffallan/claude-skills (11,361 stars, last pushed 1mo ago), licensed MIT. It adds 91 tokens to every session and 1,602 once invoked, about $0.0005 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 2026-08-30.
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