128-java-generics SKILL.md skillA
128-java-generics from jabrena/plinth is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add jabrena/plinth/128-java-generics@v0.19.0Pins v0.19.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- jabrena/plinth
- Path
skills/128-java-generics/SKILL.md- Versions recorded
- 6
- Latest version
- v0.19.0, committed Sep 26, 2026
- First version recorded
- Apr 26, 2026
- Size
- 3,828 bytes
- Repository stars
- 461
- License
- Apache-2.0
Use when you need to review, improve, or refactor Java code for generics quality — including avoiding raw types, applying the PECS (Producer Extends Consumer Super) principle for wildcards, using bounded type parameters, designing effective generic methods, leveraging the diamond operator, understanding type erasure implications, handling generic inheritance correctly, preventing heap pollution with @SafeVarargs, and integrating generics with modern Java features like Records, sealed types…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Java Generics Best Practices Review and improve Java code using comprehensive generics best practices that enforce compile-time type safety and enable flexible, reusable APIs. **What is covered in this Skill?** - Type safety: avoiding raw types, eliminating unsafe casts - Code reusability: generic methods and types for multiple type contexts - PECS wildcards: `? extends` for producers, `? super` for consumers - Diamond operator for type inference - Type erasure awareness: type tokens, factory patterns, array creation - Generic inheritance and variance: invariance, covariance, contravariance - `@SafeVarargs` for heap pollution prevention - Wildcard capture helpers, self-bounded generics (CRTP) for fluent builders - Proper wildcard API design: `Comparator<? super T>`, `Function<? super T, ? extends R>` - Arrays-vs-generics covariance pitfalls, serialization with `TypeReference`/`TypeToken` - Generic naming conventions (`T`, `E`, `K/V`, `?`), typesafe heterogeneous containers - Integration with Records, sealed types, and pattern matching …
Read the whole file at its exact version.
How to install
mdr add jabrena/plinth/128-java-generics@sha256:a6ea546a12a126c8The line at the top of this page pins the label v0.19.0, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_y5aoit3a3cq5goce)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 6 versions of this file, between Apr 26, 2026 and Sep 26, 2026, about one every 31 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.19.0 latest | 2026-09-26 | 9569c35 | 3,828 B | A | view · diff |
| v0.18.0 | 2026-08-01 | 26b0e71 | 3,828 B | A | view · diff |
| v0.17.0 | 2026-07-10 | aaee915 | 3,828 B | A | view · diff |
| v0.16.0 | 2026-06-15 | b73c9d3 | 3,657 B | A | view · diff |
| v0.15.0 | 2026-05-29 | a800339 | 3,657 B | A | view · diff |
| v0.15.0-SNAPSHOT | 2026-04-26 | 819f349 | 3,666 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (3828 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
jabrena/plinth · 461 stars · license Apache-2.0 · pushed 2026-11-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_y5aoit3a3cq5goce GET https://markdownregistry.com/api/v1/resolve?ref=jabrena/plinth/128-java-generics GET https://markdownregistry.com/api/v1/blob/a6ea546a12a126c8e4a38b16e8ab1b6d73fe325ce29170e744f02ac73fd2928a
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.