modern-kotlin SKILL.md skillA
modern-kotlin from heapy/kortex is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add heapy/kortex/modern-kotlin@git:20260804.a1d1f5bPins git:20260804.a1d1f5b in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- heapy/kortex
- Path
plugins/kortex/skills/modern-kotlin/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260804.a1d1f5b, committed Aug 4, 2026
- First version recorded
- Jul 19, 2026
- Size
- 15,073 bytes
- Repository stars
- 7
- License
- Apache-2.0
Use when writing, reviewing, or modernizing Kotlin code with recent language versions (2.0–2.4.x, including 2.4.10 and 2.4.20-Beta1), including context parameters, collection literals, guard conditions in when, multi-dollar interpolation, non-local break/continue, explicit backing fields, nested type aliases, name-based destructuring, data objects, Enum.entries, rangeUntil, unused-return-value checker, K2 smart casts, contracts, experimental -X compiler flags, exception-handling idioms…
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
# Modern Kotlin Use this skill to write idiomatic Kotlin with the features added in the last four years (mid-2022 → 2026, Kotlin 1.7 → 2.4.20-Beta1) and to know exactly which compiler flag or opt-in each preview feature needs. State as of July 2026: - **Latest stable: 2.4.10** (July 14, 2026). **EAP: 2.4.20-Beta1** (2.4.20 final planned September 2026). - Default language version is 2.4. **K1 is gone**: 2.4.0 dropped `-language-version 1.9`; K2 has been the only compiler since 2.0.0 (May 2024). - Context receivers (`-Xcontext-receivers`) were **removed in 2.3.20** — always migrate to context parameters. Detailed per-version notes with full stdlib/tooling changes live in `references/` (linked at the bottom). Older pre-2022 features (sealed interfaces, value classes, `fun interface`, Duration API, …) are in [references/kotlin-1.4-1.6.md](references/kotlin-1.4-1.6.md). ## Release timeline | Version | Date | Language headliners | |---|---|---| | 1.7.0 / 1.7.20 | Jun / Sep 2022 | K2 Alpha; builder inference, `T & Any`, opt-in stable; `..<` and `data object` previews | …
Read the whole file at its exact version.
How to install
mdr add heapy/kortex/modern-kotlin@sha256:fce20223f7ec0450The line at the top of this page pins the label git:20260804.a1d1f5b, 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_zcwe2zpppy2i5rmd)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 2 versions of this file, between Jul 19, 2026 and Aug 4, 2026, about one every 17 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260804.a1d1f5b latest | 2026-08-04 | a1d1f5b | 15,073 B | A | view · diff |
| git:20260719.4979c22 | 2026-07-19 | 4979c22 | 13,872 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 (15073 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
heapy/kortex · 7 stars · license Apache-2.0 · pushed 2026-11-02 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_zcwe2zpppy2i5rmd GET https://markdownregistry.com/api/v1/resolve?ref=heapy/kortex/modern-kotlin GET https://markdownregistry.com/api/v1/blob/fce20223f7ec0450ee676d9583df339b473fb50a51a80e5ec7fec70fc617154e
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.