spotify_pause

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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It simply says 'pause playback' without explaining what happens if no device is specified, whether authentication is needed, or how errors are handled. The tool's side effects are not described.

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 short phrase, making it concise and front-loaded. There is no redundant wording. However, it is under-specified, but for conciseness alone it earns a high score.

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 one optional parameter and no output schema, the description is incomplete. It does not explain the effect on playback state, whether device_id defaults to the active device, or any potential errors. An agent would need to infer behavior from the name alone.

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 schema describes the optional device_id parameter, and schema coverage is 100%. The description does not mention the parameter, but the schema adequately documents it. Baseline 3 applies because the description adds no extra parameter context.

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 '暂停播放' (pause playback) clearly states a specific verb and resource. It is unambiguous that the tool pauses current playback. However, it does not differentiate from siblings like spotify_next or spotify_previous, though the purpose is distinct enough.

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. It does not mention prerequisites such as an active playback session, or whether to specify a device. No exclusions or alternative tools are referenced.

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