Nextcloud Android is the Android mobile app for accessing and managing data stored on a Nextcloud server. It is for Nextcloud users who want to work with their files and other server data from an Android device.
Borrowing it
Nothing to install: this file belongs to nextcloud/android. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/nextcloud/android/master/.claude/skills/android-java-to-kotlin/SKILL.mdgit clone --depth 1 https://github.com/nextcloud/androidWrote 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/nextcloud/android/android-java-to-kotlin)<a href="https://agentmods.dev/skills/nextcloud/android/android-java-to-kotlin"><img src="https://agentmods.dev/badge/skills/nextcloud/android/android-java-to-kotlin/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/nextcloud/android/android-java-to-kotlin"><img src="https://agentmods.dev/badge/skills/nextcloud/android/android-java-to-kotlin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
SkillSpector: 1 finding, up to low
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- low Excessive Agency · line 87 Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.Fix: Limit the skill's scope to its documented purpose. Remove instructions that enable the agent to perform actions outside its stated functionality.
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 | $0.00136 | $0.01630 |
| Opus 5.5 | $0.00054 | $0.00652 |
| Sonnet 5.5 | $0.00027 | $0.00326 |
| Haiku 4.5 | $0.00014 | $0.00163 |
Grade A, and why
android-java-to-kotlin 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 2mo 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.
The source is not reproduced here
Licensed GPL-2.0
The repository is licensed GPL-2.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
What ships with it
7 files 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.
- 2mo ago First seen · 131 lines · 136 tokens per session scan A b6af88591a9d
android-java-to-kotlin is a skill published in the GitHub repository nextcloud/android (5,677 stars, last pushed yesterday), licensed GPL-2.0. It adds 136 tokens to every session and 1,630 once invoked, about $0.0005 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 2026-09-03.
android-java-to-kotlin compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| android-java-to-kotlinnextcloud/android | Skill | 5.7k | yesterday | GPL-2.0 | A | 136 | Claude Code |
| kmp-lspHessesian/kmp-lsp | Skill | 207 | 2d ago | MIT | A | 114 | Claude Code, Codex |
| findviewbyid-to-viewbindingalmasumdev/awesome-java-android-agent-skills | Skill | 1 | 6mo ago | none | A | 54 | Claude Code, Codex |
| compose-animationschrisbanes/skills | Skill | 1.1k | yesterday | Apache-2.0 | A | 64 | Claude Code |
| compose-focus-navigationchrisbanes/skills | Skill | 1.1k | yesterday | Apache-2.0 | A | 41 | Claude Code |
| compose-multiplatformericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 80 | Claude Code, Codex |
| kotlin-androidericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 78 | Claude Code, Codex |