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 jabrena/cursor-rules-examples --skill 122-java-type-designgit clone --depth 1 https://github.com/jabrena/cursor-rules-examplesWrote 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/jabrena/cursor-rules-examples/122-java-type-design)<a href="https://agentmods.dev/skills/jabrena/cursor-rules-examples/122-java-type-design"><img src="https://agentmods.dev/badge/skills/jabrena/cursor-rules-examples/122-java-type-design/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/jabrena/cursor-rules-examples/122-java-type-design"><img src="https://agentmods.dev/badge/skills/jabrena/cursor-rules-examples/122-java-type-design.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 | $0.00091 | $0.00580 |
| Opus 5.5 | $0.00036 | $0.00232 |
| Sonnet 5.5 | $0.00018 | $0.00116 |
| Haiku 4.5 | $0.00009 | $0.00058 |
Grade A, and why
122-java-type-design 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.
How it starts
The opening of the file, as written. The whole thing — 51 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Type Design Thinking in Java
Review and improve Java code using comprehensive type design principles that apply typography concepts to code structure and organization for maximum clarity and maintainability.
What is covered in this Skill?
- Clear type hierarchies: nested static classes, logical structure
- Consistent naming conventions: domain-driven patterns, uniform interface/implementation naming
- Strategic whitespace for readability
- Type-safe wrappers: value objects replacing primitive obsession (EmailAddress, Money)
- Generic type parameters: flexible reusable types, bounded parameters
- Domain-specific fluent interfaces: builder pattern, method chaining
- Type "weights": conceptual importance — core domain vs supporting vs utility
- Type contrast through interfaces: contract vs implementation separation
- Aligned method signatures: consistent parameter and return types across related classes
- Self-documenting code: clear descriptive names
- BigDecimal for precision-sensitive calculations (financial/monetary operations)
- Strategic type selection: Optional, Set vs List, interfaces over concrete types
Scope: The reference is organized by examples (good/bad code patterns) for each core area. Apply recommendations based on applicable examples.
Constraints
Before applying any type design changes, ensure the project compiles. If compilation fails, stop immediately — do not proceed until resolved. After applying improvements, run full verification.
- MANDATORY: Run
./mvnw compileormvn compilebefore applying any change - SAFETY: If compilation fails, stop immediately and do not proceed — compilation failure is a blocking condition
- VERIFY: Run
./mvnw clean verifyormvn clean verifyafter applying improvements - BEFORE APPLYING: Read the reference for detailed examples, good/bad patterns, and constraints
When to use this skill
- Review Java code for type design
- Improve type design in Java code
- Fix primitive obsession in Java code
- Create value objects in Java code
- Create type hierarchies in Java code
- Create fluent interfaces in Java code
What ships with it
1 file 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.
- 1mo ago First seen · 51 lines · 91 tokens per session scan A 5ed24d072d74
122-java-type-design is a skill published in the GitHub repository jabrena/cursor-rules-examples (2 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 91 tokens to every session and 580 once invoked, about $0.0004 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 2026-08-31.
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