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

Annotations already declare readOnlyHint=true, idempotentHint=true and destructiveHint=false, so the description's 'without changing the volume' largely restates them. The one genuinely additive point is 'without playing audio' (no audible side effect), but nothing is said about failure modes such as an unreachable or unpaired device.

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 tight sentences: the action and target come first, followed by a single negative constraint. No filler, no 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?

With an output schema present and the sole parameter fully documented, the description need only convey scope and safety, which it does. It could add what happens when the paired device is offline, but that gap is minor for a read-only inspection tool.

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 coverage is 100% and the single 'device' parameter already documents that it comes from list_devices. The description adds no further meaning to the parameter, so the 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?

States a specific verb ('inspect') and precise resource ('supported system output volume and mute state on a paired computer'), which an agent can immediately distinguish from the mutating siblings audio_set_volume, audio_mute and audio_unmute.

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 clause 'reads local audio settings without playing audio or changing the volume' implicitly routes the agent here for inspection rather than mutation. It stops short of naming the setter siblings explicitly as alternatives, which a 5 would require.

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