Spotify MCP Server

Instructions

Implementation Reference

• src/spotify.ts:442-448 (handler)

  Core implementation of the saveTracks function in SpotifyService. Extracts track IDs, formats them, and makes a PUT request to Spotify API endpoint /me/tracks to save tracks to user's library.
  async saveTracks(token: string, trackIds: string | string[]): Promise<void> { const ids = Array.isArray(trackIds) ? trackIds.map((id) => this.extractId(id)) : [this.extractId(trackIds)]; const params = { ids: ids.join(",") }; return await this.makeRequest<void>("me/tracks", token, params, "PUT"); }
• src/mcp/tools/tracks.ts:204-207 (handler)

  The MCP tool handler for 'save_tracks' that validates arguments and delegates execution to the SpotifyService.saveTracks method.
  handler: async (args: any, spotifyService: SpotifyService) => { const { token, trackIds } = args; return await spotifyService.saveTracks(token, trackIds); },
• src/mcp/tools/tracks.ts:198-203 (schema)

  Zod-based input schema definition for the 'save_tracks' tool, requiring a Spotify token and an array of track IDs.
  schema: createSchema({ token: commonSchemas.token(), trackIds: z .array(z.string()) .describe("Array of Spotify track IDs to save"), }),
• src/mcp/tools/tracks.ts:156-208 (registration)

  Complete registration of the 'save_tracks' tool as part of the trackTools object, including title, detailed description, schema, and handler reference.
  save_tracks: { title: "Save Tracks to Library", description: `Add tracks to the user's personal library, creating a permanent collection of favorite music. 🎯 USE CASES: • Save discovered tracks for future listening • Build personal music library from recommendations • Like tracks during music discovery sessions • Create permanent collections of favorite songs • Save music for offline listening and easy access 📝 WHAT IT RETURNS: • Confirmation of successful track saves • Updated library count and collection size • Timestamp information for when tracks were saved • Error details for tracks that couldn't be saved • Success status for bulk save operations 🔍 EXAMPLES: • "Save 'Bohemian Rhapsody' to my library" • "Add these 5 discovered tracks to my liked songs" • "Save track IDs: 4uLU6hMCjMI75M1A2tKUQC, 7qiZfU4dY1lWllzX7mkmht" • "Like all tracks from this great album" 💖 BUILDING YOUR COLLECTION: • Creates permanent access to favorite music • Tracks appear in your "Liked Songs" playlist • Enables offline playback for saved content • Perfect for building personalized music libraries • Essential for music discovery and curation 💡 COLLECTION STRATEGIES: • Save tracks immediately during discovery • Build thematic collections of related music • Use bulk saves for efficiency with multiple tracks • Regular saving helps track music evolution • Create personal "greatest hits" collections ⚠️ REQUIREMENTS: • Valid Spotify access token with user-library-modify scope • Tracks must be available in user's market • Maximum 50 tracks can be saved per request`, schema: createSchema({ token: commonSchemas.token(), trackIds: z .array(z.string()) .describe("Array of Spotify track IDs to save"), }), handler: async (args: any, spotifyService: SpotifyService) => { const { token, trackIds } = args; return await spotifyService.saveTracks(token, trackIds); }, },
• src/mcp/tools/index.ts:27-27 (registration)

  Registration of trackTools (including save_tracks) into the central allTools registry used by ToolRegistrar for MCP tool definitions.
  ...trackTools,