Pause Spotify

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

Annotations already declare idempotentHint=true, destructiveHint=false, and readOnlyHint=false. The description adds the context that playback pauses on a 'selected or active device', which is useful. It does not disclose error behavior (e.g., if no device is active) or side effects, but given the annotations cover safety, this is adequate.

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 10-word sentence that is up-front and to the point. Every word earns its place; no filler or redundant information.

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?

This is a simple 1-parameter control tool. The description sufficiently covers the action and device targeting. The presence of an output schema and annotations (idempotent, non-destructive) reduces the need for more detail. A minor gap is the lack of mention about what happens when no device is found, but overall it is complete enough for the tool's simplicity.

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 has one optional device_id parameter with 0% description coverage. The description's phrase 'on a selected or active device' gives meaning to device_id: it can specify a device or fall back to the active one. This compensates partially, but it doesn't explain how to obtain a device_id or the exact behavior when null.

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 'Pause Spotify playback on a selected or active device' uses a specific verb ('pause') and resource ('Spotify playback'), and clearly distinguishes it from siblings like spotify_resume, spotify_play, and spotify_next. The scope ('selected or active device') adds precision.

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: when the user wants to pause Spotify playback. However, it does not explicitly mention when NOT to use it or contrast with alternatives (e.g., stop vs pause). The context of 'selected or active device' gives some situational hint, but the guidance is basically implicit rather than explicit.

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