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 of behavioral disclosure but fails to mention error conditions (e.g., what happens if nothing is playing), reversibility, or the nature of the output schema which exists but is undocumented.

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?

The single sentence is appropriately front-loaded and efficient, containing no redundant words. However, given the complete lack of schema documentation and annotations, the extreme brevity contributes to informational gaps rather than clarity.

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?

For a tool with an existing output schema and one undocumented parameter, the description is insufficient. It neither describes the return value nor compensates for the 0% schema coverage by explaining the device_id parameter or providing usage examples.

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 description coverage is 0% and the description completely omits mention of the 'device_id' parameter. It fails to explain that this optional parameter specifies which device to pause, leaving a critical gap for an agent to understand when to populate this field.

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 ('Pause') and resource ('current playback'), making the core action clear. While it doesn't explicitly name Spotify (relying on the tool name), the intent is unambiguous and the verb choice implicitly distinguishes it from siblings like 'spotify_resume' or 'spotify_play'.

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 provides no guidance on when to use this tool versus alternatives (e.g., 'spotify_resume' or stopping playback), nor does it explain when to provide the optional 'device_id' parameter versus relying on the default null behavior.

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