gof-patterns-in-modern-java SKILL.md skillA
gof-patterns-in-modern-java from robsonkades/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add robsonkades/agent-skills/gof-patterns-in-modern-java@git:20260927.9ecadfdPins git:20260927.9ecadfd in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- robsonkades/agent-skills
- Path
skills/gof-patterns-in-modern-java/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260927.9ecadfd, committed Sep 27, 2026
- First version recorded
- Sep 3, 2026
- Size
- 9,689 bytes
- Repository stars
- 3
- License
- Apache-2.0
Which Gang-of-Four patterns modern Java and Spring already implement, which they only change the expression of, and which still need writing by hand. Covers records, sealed types and pattern matching against Visitor, State, Composite and Interpreter; lambdas and functional interfaces against Strategy, Command, Factory Method and Observer; the container against Singleton, Abstract Factory and Factory Method; framework mechanisms against Decorator and Proxy; and what virtual threads and…
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
# Patterns in Modern Java
## Purpose
Separate what a pattern _is_ from how it is _written_. Almost no GoF pattern has become obsolete;
many have stopped needing a class hierarchy, and several are now supplied by the language or the
framework so completely that hand-writing them duplicates working machinery.
The distinction to hold throughout:
```text
Design intent "this algorithm varies, and callers must not know
which one runs" → still true, still Strategy
Implementation interface + N classes + a selector
mechanism → optional; a lambda expresses the same intent
```
Name the intent when useful ("Strategy, as a function"); keep established consumer-facing names.
Before replacing a mechanism, inspect ordinary calls, public extension use and failure/misuse
behavior. Reuse known forces and project evidence; ask only for missing identity, ownership,
lifecycle or compatibility requirements that could change the choice. Retaining an adequate
implementation is a valid result; state what evidence would justify changing it.
Inspect compiler release/toolchains, resolved framework versions, CI/runtime and existing extension
…Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/gof-patterns-in-modern-java@sha256:3201083c996d8d82The line at the top of this page pins the label git:20260927.9ecadfd, 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_qqod2wgxdzl42iwa)
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Versions
The registry has recorded 5 versions of this file, between Sep 3, 2026 and Sep 27, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260927.9ecadfd latest | 2026-09-27 | 9ecadfd | 9,689 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 9,296 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 8,983 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 8,492 B | A | view · diff |
| git:20260903.f199530 | 2026-09-03 | f199530 | 7,570 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 (9689 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
robsonkades/agent-skills · 3 stars · license Apache-2.0 · pushed 2026-10-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qqod2wgxdzl42iwa GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/gof-patterns-in-modern-java GET https://markdownregistry.com/api/v1/blob/3201083c996d8d8221b4a8f01c3868e1153a434137d27e249885b08a2d241f17
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.