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. It successfully documents the input constraint (max 5 users) but does not disclose other behavioral traits like what happens if the playlist doesn't exist, whether the check is real-time, or caching behavior. It implies read-only operation via 'Check' but doesn't confirm this explicitly.

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?

Single sentence, front-loaded with the verb, zero redundancy. The parenthetical constraint '(max 5 user IDs)' is efficiently placed. Every word earns its place—'specific' clarifies the non-global scope, and 'max 5' prevents invalid invocations.

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 2-parameter read operation with an output schema available, the description is sufficiently complete. It covers the core function and the primary API constraint. While it could benefit from ID format examples given the 0% schema coverage, the existence of an output schema means return values need not be described here.

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?

Given 0% schema description coverage, the description compensates by implicitly mapping 'playlist' to playlist_id and 'user IDs' to user_ids. Crucially, it adds the 'max 5' constraint not present in the schema. However, it omits format specifications (e.g., whether these are Spotify URIs or raw IDs) and doesn't explicitly note that user_ids is an array.

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 action ('Check') and resource ('if specific users follow a playlist'), distinguishing it from siblings like check_following_artists or check_saved_tracks by specifying 'playlist' and 'users'. It effectively conveys the bidirectional follow-checking logic specific to this endpoint.

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 a critical usage constraint ('max 5 user IDs') which helps prevent errors, but lacks broader guidance on when to use this versus get_playlist (which retrieves playlist details) or follow_playlist (which modifies state). No prerequisites or rate limiting hints are provided.

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