compare_devices

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

With no annotations provided, the description carries the full burden. It explicitly discloses that the tool is read-only, which is critical safety information. It also describes output behavior (listing every available device and sorting by active state, type, and volume). It does not mention authorization or failure behavior, but for a simple read-only listing tool 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 dense sentence that front-loads the core purpose and ordering rules, then appends the safety note. Every word adds value, and the structure is easy to parse.

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 provides enough information to invoke it correctly: it lists the resource, scope, ranking criteria, and safety profile. A slightly more explicit note about how this differs from get_devices would make it fully complete, but it is not a significant gap.

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 only parameter, response_format, already has a full schema description covering the three enum options. Since schema coverage is 100%, the description does not need to add parameter details. The baseline of 3 applies here.

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 ('List'), the resource ('every available Spotify device'), and the exact ordering logic (active state, device type, volume). This distinguishes it from raw device-listing siblings like get_devices by specifying a comparison-oriented ranked output.

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 makes the use case clear: retrieve and compare all available devices in a defined priority order. It does not explicitly name alternative tools or state when not to use it, but the ranking behavior and 'read-only' note provide sufficient context for selection.

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