spotify-mcp

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

With no annotations provided, the description carries the full burden. It discloses the batch limit constraint ('max 50 per call'), but omits other critical behavioral traits: idempotency (what happens if album already saved), authentication requirements, error handling for invalid IDs, and the nature of the output schema.

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?

Extremely efficient at 9 words. The constraint is parenthetically appended without breaking flow. Every element earns its place—no filler or redundancy while conveying both the action and operational limit.

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?

Given the simple single-parameter operation and existence of an output schema, the description is nearly sufficient. However, with zero schema descriptions and no annotations, it should ideally include guidance on obtaining album IDs or their expected format to be fully complete.

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%, requiring the description to compensate. It mentions 'albums' which maps to the 'album_ids' parameter, and the 'max 50' constraint implies the array length limit. However, it fails to specify ID format (Spotify ID vs URI), source (where to obtain them), or explicitly map the constraint to the 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?

The description uses a specific verb ('Save') and resource ('albums to your library') that clearly distinguishes it from siblings like spotify_save_tracks, spotify_check_saved_albums, and spotify_get_saved_albums. The parenthetical '(max 50 per call)' adds essential operational scope.

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?

While the description implies this is for library storage (vs playlist addition or checking status), it lacks explicit when-to-use guidance, prerequisites (e.g., needing valid Spotify album IDs), or pointers to sibling tools like spotify_check_saved_albums for deduplication checking.

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