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makesh-kumar

Spotify MCP Server

by makesh-kumar

getPlaylistTracks

Retrieve track listings from Spotify playlists by specifying playlist ID, with options for pagination and result limits.

Instructions

Get a list of tracks in a Spotify playlist

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
playlistIdYesThe Spotify ID of the playlist
limitNoMaximum number of tracks to return (1-50)
offsetNoOffset for pagination (0-based index)

Implementation Reference

  • The handler function fetches tracks from the specified Spotify playlist using the playlists.getPlaylistItems API method, handles pagination with limit and offset, filters and formats track information (name, artists, duration, ID), and returns a markdown-formatted text response with the list of tracks.
    handler: async (args, _extra: SpotifyHandlerExtra) => {
      const { playlistId, limit = 50, offset = 0 } = args;
    
      const playlistTracks = await handleSpotifyRequest(async (spotifyApi) => {
        return await spotifyApi.playlists.getPlaylistItems(
          playlistId,
          undefined,
          undefined,
          limit as MaxInt<50>,
          offset,
        );
      });
    
      if ((playlistTracks.items?.length ?? 0) === 0) {
        return {
          content: [
            {
              type: 'text',
              text: "This playlist doesn't have any tracks",
            },
          ],
        };
      }
    
      const formattedTracks = playlistTracks.items
        .map((item, i) => {
          const { track } = item;
          if (!track) return `${offset + i + 1}. [Removed track]`;
    
          if (isTrack(track)) {
            const artists = track.artists.map((a) => a.name).join(', ');
            const duration = formatDuration(track.duration_ms);
            return `${offset + i + 1}. "${track.name}" by ${artists} (${duration}) - ID: ${track.id}`;
          }
    
          return `${offset + i + 1}. Unknown item`;
        })
        .join('\n');
    
      return {
        content: [
          {
            type: 'text',
            text: `# Tracks in Playlist (${offset + 1}-${offset + playlistTracks.items.length} of ${playlistTracks.total})\n\n${formattedTracks}`,
          },
        ],
      };
    },
  • Zod schema for input validation: requires playlistId (string), optional limit (1-50 number), optional offset (number >=0).
    schema: {
      playlistId: z.string().describe('The Spotify ID of the playlist'),
      limit: z
        .number()
        .min(1)
        .max(50)
        .optional()
        .describe('Maximum number of tracks to return (1-50)'),
      offset: z
        .number()
        .min(0)
        .optional()
        .describe('Offset for pagination (0-based index)'),
    },
  • src/read.ts:531-539 (registration)
    The getPlaylistTracks tool is included in the readTools export array, which collects read-related tools.
    export const readTools = [
      searchSpotify,
      getNowPlaying,
      getMyPlaylists,
      getPlaylistTracks,
      getRecentlyPlayed,
      getUsersSavedTracks,
      getQueue,
    ];
  • src/index.ts:12-14 (registration)
    All tools from readTools (including getPlaylistTracks), playTools, and albumTools are registered to the MCP server using server.tool() for each tool.
    [...readTools, ...playTools, ...albumTools].forEach((tool) => {
      server.tool(tool.name, tool.description, tool.schema, tool.handler);
    });

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv1.0.0

TDQS

B3.2/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description carries the full burden of behavioral disclosure. It only says 'Get a list of tracks' without explaining pagination (offset/limit), return structure, whether tracks are full objects or references, authentication needs, or error behavior. This is a minimal read operation but lacks important context.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, concise sentence with no redundant words. It is front-loaded and gets straight to the point. This is appropriately sized for the simplicity of the tool.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

There is no output schema and no annotations. The description fails to explain what a 'list of tracks' actually contains (e.g., track metadata, audio features) or how pagination works. This is insufficient for a tool that has no other documentation beyond the schema.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so the baseline is 3. The description adds no parameter-specific meaning beyond what the schema already provides; all parameters are documented in the input schema with descriptions.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action ('Get') and the resource ('a list of tracks in a Spotify playlist'), which distinguishes it from siblings like getAlbumTracks or getPlaylist. The verb+resource structure is specific and unambiguous.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is provided on when to use this tool versus alternatives such as getAlbumTracks or getUsersSavedTracks. The description only states what it does, leaving the agent to infer usage context. There are no exclusions or alternative mentions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.