follow_playlistSave a Spotify playlist to your library using its ID, URI, or open.spotify.com URL so it appears among your followed playlists.
Follow (save) a playlist so it appears in the user's library.
Args:
playlist_id: Playlist ID, URI or open.spotify.com URL
| Name | Required | Description | Default |
|---|---|---|---|
| playlist_id | Yes |
| Name | Required | Description | Default |
|---|---|---|---|
| status | Yes | ||
| message | Yes | ||
| snapshot_id | No |
Changes observed during successful MCP inspections.
v0.8.1Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations already declare non-read-only, idempotent, non-destructive, open-world behavior, so the safety burden is light. The description adds that the result is the playlist appearing in the user's library, which is useful persistent-effect context, but says nothing about auth requirements, what happens on repeat calls, or whether anything is modified server-side beyond the follow relation.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Is the description appropriately sized, front-loaded, and free of redundancy?
Two short front-loaded lines with no wasted wording, and the essential scope statement comes first. The 'Args:' block formatting is slightly mechanical but appropriate for a one-parameter tool.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
An output schema exists, so return values need not be explained, and the single parameter's accepted formats are covered. The main remaining gaps are authentication context and repeat-call semantics, which are minor for a simple one-argument follow operation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 0% and the schema only says 'Playlist Id' as a string, so the description meaningfully adds that a URI or open.spotify.com URL is also accepted. That format guidance is exactly the value the schema fails to provide for this single required parameter.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Does the description clearly state what the tool does and how it differs from similar tools?
Description states a specific verb and resource ('Follow (save) a playlist') and clarifies the effect ('appears in the user's library'), which makes it distinguishable from sibling unfollow_playlist. It does not explicitly name that sibling, so it falls just short of full sibling differentiation.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Does the description explain when to use this tool, when not to, or what alternatives exist?
The parenthetical 'save' and 'appears in the user's library' imply the use case, but the description never says when to choose this over unfollow_playlist, nor what conditions apply (e.g. already-followed playlists, authentication requirement). Usage is inferable but not guided.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.