get_playback_state

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

The description discloses that the tool retrieves playback state, which implies a read operation. However, with no annotations, it fails to provide additional behavioral details such as side effects, permissions needed, or response structure beyond the output schema.

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 concise sentence (10 words) that is front-loaded with the core purpose. Every word is necessary and adds value without redundancy.

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 has no parameters, an output schema exists, and the description covers the key returned elements, the description is largely complete. However, it could be slightly improved by noting that it returns the full playback state versus just the current track (sibling 'get_currently_playing').

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 input schema has zero parameters and is fully covered by the description (100% coverage). The description adds no parameter information, which is acceptable because no parameters exist. Baseline score of 4 is appropriate.

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 action ('Get') and resource ('current playback state'), and specifies the included information (track, device, progress). It effectively distinguishes from siblings like 'get_currently_playing' which likely returns only the current track.

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 usage guidelines are provided. The description does not indicate when to use this tool versus alternatives like 'get_currently_playing' or 'get_queue'. There is no mention of prerequisites, context, or exclusions.

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