get_currently_playing

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

With no annotations provided, the description carries the full burden. It indicates a read operation but fails to disclose important behavior such as the need for prior authentication (sibling authenticate tool exists), the return format (track object or null), or any side effects. More detail is needed for a complete behavioral picture.

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 12-word sentence with no wasted words. It is front-loaded and immediately conveys the tool's purpose, achieving perfect conciseness.

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 simple tool with no parameters and no output schema, the description covers the essential purpose. However, it could be improved by explicitly stating the return value (e.g., 'Returns a track object or null'). The 'if any' hints at null but does not specify the object structure.

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?

The tool has zero parameters, and schema coverage is 100% (since there are none). The baseline for no parameters is 4. The description adds no parameter info, which is appropriate because there are none to explain.

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 verb 'Show' and the resource 'track currently playing', with scope on the user's Spotify account. It distinguishes from siblings like get_track (specific track) and get_playlist (playlist), making the tool's purpose unambiguous.

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 implies usage for checking current playback and mentions the conditional 'if any', but it does not explicitly state when to use this tool versus alternatives (e.g., get_track) or provide any exclusions or prerequisites like authentication.

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