Spotify MCP Server

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. It states the tool can 'get the queue or add tracks,' implying both read and write operations, but doesn't detail permissions, rate limits, side effects (e.g., queue modification impact), or response format. This is inadequate for a tool with potential mutations.

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 description is a single, efficient sentence that front-loads the core purpose ('Manage the playback queue') and lists actions. It avoids redundancy, though it could be slightly more structured by separating action contexts.

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 tool's complexity (managing queue with read/write actions), lack of annotations, and no output schema, the description is insufficient. It doesn't cover behavioral aspects like permissions, effects of adding tracks, or return values, leaving significant gaps for agent understanding.

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 100%, so the schema fully documents the two parameters (action and track_id). The description adds no additional meaning beyond what's in the schema, such as explaining track_id format or action nuances. Baseline 3 is appropriate as the schema handles parameter documentation.

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's purpose as managing the playback queue with specific actions (get or add tracks), using a verb+resource structure. However, it doesn't distinguish this queue management from sibling tools like SpotifyPlayback or SpotifyPlaylist, which might handle similar playback or playlist functions, leaving some ambiguity about 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?

No explicit guidance is provided on when to use this tool versus alternatives. The description mentions actions but doesn't specify contexts, prerequisites, or exclusions relative to sibling tools like SpotifyPlayback or SpotifyPlaylist, leaving the agent to infer usage based on action types alone.

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