spotify_get_album_art_url

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

With no annotations, the description clearly states it returns the largest image URL for the current track. However, it does not address edge cases like no track playing or failed retrieval, which would be useful for transparency.

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 concise sentences front-load the primary purpose and specific output, with no redundant words.

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?

The description is complete for a no-parameter, no-output-schema tool, explaining what it does and a use case. It lacks details on prerequisites or error behavior but is adequate given the tool's simplicity.

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?

No parameters are defined, so the description carries no burden for parameter semantics. The baseline score of 4 is appropriate as the description doesn't need to explain parameters.

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 clearly states the tool retrieves the URL of album artwork for the currently playing track, emphasizing 'ONLY' and 'largest available image URL'. This distinguishes it from sibling tools that return full album info or other details.

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 description mentions it is 'perfect for displaying in HUDs', implying a use case but does not explicitly contrast with alternatives like spotify_get_album_info or provide when-not-to-use guidance.

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