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Use when a user wants to fill a portable music player (Walkman, iPod, USB drive) with a curated random selection from a music library on a NAS or local directory. Handles format filtering, artist/album diversity balancing, and size targeting.
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SOC 職業分類に基づく
Expert tutor that gets you from zero to working knowledge on any TOPIC fast, grounded in real sources rather than generic filler. Use this whenever the user wants to LEARN, understand, ramp up on, or get up to speed on something and has limited time: a new codebase or project they have been assigned, an unfamiliar technology or framework, a domain concept, an API, a paper, a business area. Triggers on phrases like "help me learn X", "I have N hours to understand X", "teach me X", "get me up to speed on X", "crash course on X", "quiz me on X", "make me a cheat sheet for X", "explain X like I am 5", "I got assigned X and have no context". Runs a timed 4-hour sprint by default, or a single mode on request (cheat sheet, learning ladder, quiz-me, Feynman loop, resource curation). Prefer this over answering a learning request directly, because the value is the structured, interactive, source-grounded teaching loop, not a one-shot dump.
Expert tutor that gets you from zero to working knowledge on any TOPIC fast, grounded in real sources rather than generic filler. Use this whenever the user wants to LEARN, understand, ramp up on, or get up to speed on something and has limited time: a new codebase or project they have been assigned, an unfamiliar technology or framework, a domain concept, an API, a paper, a business area. Triggers on phrases like "help me learn X", "I have N hours to understand X", "teach me X", "get me up to speed on X", "crash course on X", "quiz me on X", "make me a cheat sheet for X", "explain X like I am 5", "I got assigned X and have no context". Runs a timed 4-hour sprint by default, or a single mode on request (cheat sheet, learning ladder, quiz-me, Feynman loop, resource curation). Prefer this over answering a learning request directly, because the value is the structured, interactive, source-grounded teaching loop, not a one-shot dump.
Expert tutor that gets you from zero to working knowledge on any TOPIC fast, grounded in real sources rather than generic filler. Use this whenever the user wants to LEARN, understand, ramp up on, or get up to speed on something and has limited time: a new codebase or project they have been assigned, an unfamiliar technology or framework, a domain concept, an API, a paper, a business area. Triggers on phrases like "help me learn X", "I have N hours to understand X", "teach me X", "get me up to speed on X", "crash course on X", "quiz me on X", "make me a cheat sheet for X", "explain X like I am 5", "I got assigned X and have no context". Runs a timed 4-hour sprint by default, or a single mode on request (cheat sheet, learning ladder, quiz-me, Feynman loop, resource curation). Prefer this over answering a learning request directly, because the value is the structured, interactive, source-grounded teaching loop, not a one-shot dump.
Use claude-relay to run a long or rate-limit-prone task autonomously across subscription accounts. Invoke this skill whenever the user says "use relay", "run this with relay", "do this overnight", "run this autonomously", "use relay for X", or has a multi-hour / multi-step task they want to hand off completely. Also use proactively when a task looks like it will take many turns and the user hasn't thought about rate limits yet. Guides goal writing, picks the right flags, and starts the run.
Use claude-relay to run a long or rate-limit-prone task autonomously across subscription accounts. Invoke this skill whenever the user says "use relay", "run this with relay", "do this overnight", "run this autonomously", "use relay for X", or has a multi-hour / multi-step task they want to hand off completely. Also use proactively when a task looks like it will take many turns and the user hasn't thought about rate limits yet. Guides goal writing, picks the right flags, and starts the run.
Adversarially critique your own last substantial answer before the user has to. Spawn a critic agent that verifies every claim against live sources, checks similar and related issues, finds patterns, and addresses comments directly to you. Loop (revise, re-score) until satisfied, then report where you were wrong, iterations-to-satisfy, the numeric improvement, and a final score. Use when the user asks you to criticize, challenge, stress-test, or red-team your own answer, or accepts a "critical-thinking review" offer.
| name | fill-music-player |
| description | Use when a user wants to fill a portable music player (Walkman, iPod, USB drive) with a curated random selection from a music library on a NAS or local directory. Handles format filtering, artist/album diversity balancing, and size targeting. |
| license | MIT |
| allowed-tools | Bash |
| compatibility | Codex, Claude Code, Cursor, GitHub Copilot, Windsurf, Kiro, and other Agent Skills compatible tools. Requires shell access and the fill-music-player CLI or underlying script in the target environment. |
| metadata | {"targets":["cursor"],"author":"Oleg Koval","tags":["music","media","curation","copy","cli"]} |
Curates a DJ-balanced selection of tracks from a source music library and copies them to a portable player, respecting device capacity and supported formats.
# Dry run first (always recommend this)
fill-music-player --source /Volumes/music --dest /Volumes/WALKMAN/MUSIC --dry-run
# Copy for real
fill-music-player --source /Volumes/music --dest /Volumes/WALKMAN/MUSIC
# Or run the script directly with uv
uv run fill_music_player.py --source ~/Music --dest /Volumes/USB --dry-run
Run fill-music-player --help for all options.
| Flag | Default | Purpose |
|---|---|---|
--source / -s | required | Source music root (NAS mount, ~/Music, etc.) |
--dest / -d | required | Player destination directory |
--target-gb | 95% of free space | How many GB to fill |
--formats | mp3,m4a,wma,aac | Allowed extensions |
--max-per-artist | 4 | Artist diversity cap |
--max-per-album | 3 | Album diversity cap |
--skip-dirs | (none) | Top-level dirs to skip |
--dry-run | false | Preview without copying |
--dry-run first--skip-dirs, --max-file-mb, or --max-per-artist if needed--dry-run to copy| Device | Recommended --formats |
|---|---|
| Sony Walkman NWZ series | mp3,m4a,wma |
| iPod (classic/nano) | mp3,m4a,aac |
| Generic USB player | mp3 |
| Any modern player | mp3,m4a,wma,aac,ogg,flac |
| Situation | What happens | Fix |
|---|---|---|
| NAS disconnects mid-copy | Copy fails for that file, logged as error, continues with next track | Re-run; already-copied files are skipped (if not dst.exists()) |
| Source has only FLAC/lossless | 0 files selected (FLAC not in default formats) | Use --formats flac or --formats mp3,flac |
| FAT32 filename too long or illegal chars | Filenames are sanitized: <>:"/|?* replaced with _, truncated to 80 chars | Automatic — no action needed |
| Mixed/broken ID3 tags | Falls back to folder name parsing (Genre/Artist - Album/track.mp3) | Works transparently; folder structure is the reliable fallback |
| Very large files (DJ mixes, radio shows) | Skipped by default (>20 MB) | Adjust with --max-file-mb 50 to include mixes |
| Tiny files (jingles, corrupt) | Skipped by default (<300 KB) | Adjust with --min-file-kb 100 to be more permissive |
| One artist dominates the library | Capped at 4 tracks per artist, 3 per album | Lower with --max-per-artist 2 for more variety |
| Empty genre directories | Silently skipped, no error | Normal behavior |
| Destination already has files | Existing files are not overwritten or deleted; new tracks added alongside | Clear destination first if you want a fresh set |
| SMB/NFS mount is slow | Scanning with mutagen tag reading can take 5-10 min for large libraries | Expected; the dry-run output appears once scanning completes |
Filling a Sony Walkman NWZ-B183F (4 GB) from a Synology DS918+ NAS with ~9,000 tracks across blues, funk, hip-hop, soul, IDM, dubstep, dub, indie, and post-rock:
# Step 1: Preview
fill-music-player \
--source /Volumes/music \
--dest /Volumes/WALKMAN/MUSIC \
--skip-dirs "jingles,!recordings,!restored,dubrecords" \
--formats mp3,m4a,wma \
--dry-run
# Output:
# Found 8914 candidate tracks across 14 genres
# Funk → 86 tracks (440.8 MB)
# blues → 38 tracks (316.7 MB)
# hiphop → 33 tracks (234.7 MB)
# ...
# Selected 348 tracks (2473.0 MB)
# Step 2: Copy
fill-music-player \
--source /Volumes/music \
--dest /Volumes/WALKMAN/MUSIC \
--skip-dirs "jingles,!recordings,!restored,dubrecords" \
--formats mp3,m4a,wma
Result: 348 tracks, 2.4 GB, balanced across 14 genres with max 4 tracks per artist. Artists included Fela Kuti, ZZ Top, Mobb Deep, Gregory Porter, Tinariwen, Chick Corea, Hudson Mohawke, and Funkadelic. Total copy time over SMB: ~12 minutes.