List all playlists in the user's library (owned and followed).

Get a playlist's details and its full track list.

Create a new playlist for the user.

Rename a playlist or change its description/visibility.

Add tracks (ids or spotify:track: URIs) to a playlist, skipping ones already present.

Remove tracks from a playlist.

Remove a playlist from the user's library (unfollow). Irreversible for owned playlists.

Merge several playlists into one (existing target or a new one), deduplicating tracks. Optionally delete sources.

Find one track, verifying the artist is on the result (avoids karaoke/cover mismatches). Returns null if no verified match.

Add tracks to the user's Liked Songs.

Remove tracks from Liked Songs.

Remaining /search calls for today, cache size, and whether a Spotify search ban is active. Check before bulk searching.

What this Spotify app can and cannot do (endpoints removed/renamed by Spotify for new apps).

Stats for one playlist: runtime, top artists, decades, duplicates, over-representation.

Whole-library health: liked songs in no playlist, stale/empty playlists, cross-playlist overlaps, per-playlist counts, liked-songs stats. Use before any reorganisation.

Which of the user's playlists contain a track (by name/artist substring, id, or uri); also whether it is Liked.

Duplicate tracks (same artist + title, ignoring remaster/edit suffixes) inside each playlist, with ids to remove.

Tracks only in A, only in B, and shared count.

Save a full snapshot of all playlists + liked songs to disk (backup; enables changes_since).

List saved snapshots.

What changed since a snapshot (default: latest): playlists created/deleted/renamed, tracks added/removed per playlist, likes added/removed.

Liked songs from years ago that no longer appear in top tracks or recent plays — forgotten favourites, spread across artists.

All tracks the user has Liked.

Search Spotify.

The user's most-played tracks.

The user's most-played artists.

Recently played tracks.