setVolume

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

With no annotations provided, the description carries the burden of disclosing behavioral traits. It adds the useful context that Spotify Premium is required, which is not present in the schema. However, it does not disclose potential side effects, failure modes (e.g., no active device), or whether the operation is reversible, leaving some gaps.

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 that front-loads the primary action and includes the key prerequisite. Every word provides value, with no filler or 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?

For a two-parameter tool with no output schema, the description covers the essential purpose and a prerequisite. However, it lacks contextual completeness by not distinguishing from the sibling 'adjustVolume', and it does not mention behaviors like auto-selecting a device or what happens if no active playback device exists.

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 covers 100% of the parameters with descriptions, so the baseline is 3. The description merely restates the volume range ('0-100') already present in the schema and does not add additional semantic meaning beyond the structured parameter descriptions.

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 ('Set the playback volume to a specific percentage') and the resource (playback volume), with the valid range included. It is a specific verb+resource combination, but it does not explicitly differentiate from the sibling tool 'adjustVolume', so it does not fully achieve the level of distinguishing from siblings.

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 the similar-sounding sibling 'adjustVolume'. It only mentions a prerequisite (Spotify Premium), which is a constraint rather than usage context. There is no mention of alternatives or exclusions.

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