get_device_volume_report

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

With no annotations provided, the description carries the full burden and does disclose the key behavioral trait ('Read-only') plus the exact data points returned (volume_percent, supports_volume, active state) and the active-device highlight. It does not cover edge cases such as behavior when no device is active, but for a simple report tool it is otherwise transparent.

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?

Two brief sentences with zero waste. The main sentence is front-loaded with the verb and key output fields, and the second sentence efficiently appends the read-only safety signal. Nothing could be trimmed without losing 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?

For a tool with one optional parameter, no output schema, and no annotations, the description is largely complete: it enumerates the output fields and declares read-only semantics. The main gaps are the lack of differentiation from several closely named sibling tools and no note on behavior when no device is active or when a device does not support volume.

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?

Schema description coverage is 100% — response_format is fully documented with enum values, a default, and per-format descriptions. The tool description adds nothing about the parameter, but none is needed since the schema already carries the full meaning; baseline 3 applies.

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 uses a specific verb ('Report') and names the exact resource and fields: volume_percent, supports_volume, and active state across every Spotify device, with emphasis on the active device. It is clear and specific, but it does not explicitly differentiate itself from closely related siblings such as get_devices, volume_report, or device_sync_state.

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?

Usage is only implied: an agent can infer this tool is for observing per-device volume and active-device status, and the 'Read-only' tag signals it is for observation rather than control. It provides no explicit when-to-use guidance, exclusions, or alternatives, even though the sibling list contains many overlapping tools (get_devices, volume_report, compare_devices, plan_volume_level_across_devices).

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