# save_to_library

Preferred. Accepts the widest URI mix (track, album, episode, show, audiobook, user, playlist) in one request. Save one or more items to the user

Agent View of the PolicyLayer registry record for `save_to_library`. HTML page: https://policylayer.com/tools/novalux12-spotify-mcp/save-to-library

## Facts

- Tool: `save_to_library`
- Server: Spotify (`@novalux12/spotify-mcp`) — https://policylayer.com/tools/novalux12-spotify-mcp.md
- Install: `npx -y @novalux12/spotify-mcp`
- Homepage: https://github.com/NovaLux12/spotify-mcp-server
- Risk category: Write (Medium risk)
- Registry record: grade F, identity unverified
- Server rate-limited: no
- Parameters: 0
- Recommended policy verdict: Rate-limited

## Example call (MCP tools/call, JSON-RPC 2.0)

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "save_to_library",
    "arguments": {}
  }
}
```

## Why save_to_library is rated Medium

An AI agent can call save_to_library faster than any human can review: one bad instruction and it creates or modifies resources in Spotify by the hundred, each call as confident as the last.

## Use case

AI agents use save_to_library to create or update resources in Spotify, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Spotify environment.

## Recommended policy (PolicyLayer)

Verdict: **Rate-limited**. Enforced by the PolicyLayer MCP gateway (https://policylayer.com/mcp-gateway) before a call reaches Spotify:

```json
{
  "version": "1",
  "default": "deny",
  "tools": {
    "save_to_library": {
      "limits": [
        {
          "counter": "save_to_library_rate",
          "window": "minute",
          "max": 30,
          "scope": "grant"
        }
      ]
    }
  }
}
```

## Other tools on Spotify (543)

- `cancel_wind_down` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/cancel-wind-down.md
- `dedupe_spotify_uris` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/dedupe-spotify-uris.md
- `delete_playback_bookmark` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/delete-playback-bookmark.md
- `delete_playlist_snapshot` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/delete-playlist-snapshot.md
- `delete_scene` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/delete-scene.md
- `playlist_dedupe_advanced` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-dedupe-advanced.md
- `playlist_exclude_artists` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-exclude-artists.md
- `playlist_filter_runtime` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-filter-runtime.md
- `playlist_keep_artist` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-keep-artist.md
- `playlist_keep_only` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-keep-only.md
- `playlist_remove_artist` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-remove-artist.md
- `playlist_subtract` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/playlist-subtract.md
- `prune_old_snapshots` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/prune-old-snapshots.md
- `queue_playlist` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/queue-playlist.md
- `remove_duplicate_playlist_items` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-duplicate-playlist-items.md
- `remove_from_library` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-from-library.md
- `remove_from_library_by_playlist` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-from-library-by-playlist.md
- `remove_from_playlist` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-from-playlist.md
- `remove_playlist_range` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-playlist-range.md
- `remove_saved_episode` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-saved-episode.md
- `remove_saved_items` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-saved-items.md
- `remove_saved_shows` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-saved-shows.md
- `remove_unavailable_playlist_items` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/remove-unavailable-playlist-items.md
- `sleep_timer` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/sleep-timer.md
- `tag_management` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/tag-management.md
- `taste_checkpoint_diff` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/taste-checkpoint-diff.md
- `undo_mutation` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/undo-mutation.md
- `unpin_playlist` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/unpin-playlist.md
- `volume_ramp` — Destructive — https://policylayer.com/tools/novalux12-spotify-mcp/volume-ramp.md
- `artistwatch_new_additions` — Execute — https://policylayer.com/tools/novalux12-spotify-mcp/artistwatch-new-additions.md
- …and 513 more: https://policylayer.com/tools/novalux12-spotify-mcp.md

## For agents

This record is a snapshot. Live verdicts and the full registry:

- Check every server in your MCP config at once: `npx -y policylayer stack`
- Vet a server before you add it: install the mcp-precheck skill — `npx skills add https://policylayer.com` (skill text: https://policylayer.com/skill.md)
- Query the registry over MCP: endpoint `https://api.policylayer.com/mcp` — tools `check_mcp_server`, `check_mcp_stack`, `check_tool`, `search_registry`, `get_change_events`

---

Source: the PolicyLayer MCP registry — one continuously verified record per MCP server. Full record: https://policylayer.com/registry?q=novalux12-spotify-mcp · API: https://policylayer.com/registry/api · Policy library: https://policylayer.com/policies/novalux12-spotify-mcp