martinholovsky/sota-skills · skills/sota-jvm/SKILL.md

sota-jvm skillA

sota-jvm is agent-read markdown (skill) from martinholovsky/sota-skills: State-of-the-art JVM engineering rules (2026 baseline) for Java and Kotlin that Claude applies when writing or auditing JVM code. Baseline Java 25 LTS (virtual threads final since 21; structured concurrency still preview), Kotlin 2.x. Covers modern idioms (records, sealed types, pattern matching, Kotlin null-safety/coroutines), API/null/immutability design, concurrency (virtual threads, JMM, java.util.concurrent, coroutines), security (deserialization/gadget chains, XXE, JNDI/Log4Shell-class, in.

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add martinholovsky/sota-skills/sota-jvm@git:20260820.7720f5a
Exact content
mdr add martinholovsky/sota-skills/sota-jvm@sha256:4875f1e85e4ed0a6

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_hjhsugu6u5sunzx7.svg)](https://markdownregistry.com/a/art_hjhsugu6u5sunzx7)

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Versions

versioncommittedcommitsizeaudit
git:20260820.7720f5a latest2026-08-20 7720f5a 9,589 BA view · diff
git:20260708.1a1eff62026-07-08 1a1eff6 9,486 BA view · diff
git:20260701.1c5bd882026-07-01 1c5bd88 9,397 BA view · diff
git:20260629.2ffd9f52026-06-29 2ffd9f5 9,320 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (9589 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

GitHub

martinholovsky/sota-skills · 18 stars · license CC-BY-4.0 · pushed 2026-09-05 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_hjhsugu6u5sunzx7
GET https://markdownregistry.com/api/v1/resolve?ref=martinholovsky/sota-skills/sota-jvm
GET https://markdownregistry.com/api/v1/blob/4875f1e85e4ed0a6b2ff9c6db0fbfafa3762afe83814a2ec6b5128aa0c0e0cd9