SimpMusic is a free and open-source music app for Android and desktop that uses YouTube Music and YouTube as its music backend. It is for people who want to browse, stream, organize, and listen to music with features such as lyrics, equalization, playlists, analytics, caching, and offline playback. The catalogue entries are skills, an instruction, and an agent associated with the app's development.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add skills/maxrave-dev/simpmusic/gradle-build-performancenpx skills add maxrave-dev/SimpMusic --skill gradle-build-performancegit clone --depth 1 https://github.com/maxrave-dev/SimpMusicWrote 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/maxrave-dev/simpmusic/gradle-build-performance)<a href="https://agentmods.dev/skills/maxrave-dev/simpmusic/gradle-build-performance"><img src="https://agentmods.dev/badge/skills/maxrave-dev/simpmusic/gradle-build-performance.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00037 | $0.01950 |
| Opus 5 | $0.00018 | $0.00975 |
| Sonnet 5 | $0.00007 | $0.00390 |
| Haiku 4.5 | $0.00004 | $0.00195 |
Grade A, and why
gradle-build-performance 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 5d 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-3.0
The repository is licensed GPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.
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.
- 5d ago First seen · 347 lines · 37 tokens per session scan A 5927653840ff
gradle-build-performance is a skill published in the GitHub repository maxrave-dev/SimpMusic (10,921 stars, last pushed yesterday), licensed GPL-3.0. It adds 37 tokens to every session and 1,950 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
Other skills, from other repositories
find-missing-translations
Use when comparing Android strings.xml locale files to find untranslated string resources, missing translation keys, or preparing translation work for a specific language.
android-expert
Android platform patterns for the amethyst/ module. Use when working with (1) Android navigation (Navigation Compose, type-safe routes, bottom nav), (2) runtime permissions (camera, notifications, biometrics), (3) platform APIs (Intent, Context, Activity, ContentResolver), (4) Material3 theming and edge-to-edge UI…
kotlin-expert
Advanced Kotlin patterns for AmethystMultiplatform. Flow state management (StateFlow/SharedFlow), sealed hierarchies (classes vs interfaces), immutability (@Immutable, data classes), DSL builders (type-safe fluent APIs), inline functions (reified generics, performance). Use when working with: (1) State management…
compose-expert
Advanced Compose Multiplatform UI patterns for shared composables. Use when working with visual UI components, state management patterns (remember, derivedStateOf, produceState), recomposition optimization (@Stable/@Immutable visual usage), Material3 theming, custom ImageVector icons, or determining whether to share…
compose-modifier-and-layout-style
Use when writing or reviewing Jetpack Compose layout APIs, modifier parameters, modifier chain construction, hardcoded root layout decisions, or layout wrappers around a single conditional. Technique-layer skill — complements the codebase-specific compose-expert.
desktop-expert
Compose Multiplatform Desktop patterns for the desktopApp/ module. Use when working with (1) Desktop-only APIs (Window, WindowState, Tray, MenuBar, Dialog), (2) keyboard shortcuts and menu systems with OS-aware conventions (Cmd vs Ctrl, isMacOS branching), (3) desktop navigation (NavigationRail/sidebar vs Android…