set_appearance

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

With no annotations, the description must disclose behavioral traits. It only states the action but does not reveal whether the change is reversible, what permissions are needed, or how it affects the device state (e.g., restarts UI). This is insufficient.

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 very concise (three words) but is not a full sentence. While brevity is good, it could be improved by providing a complete sentence that includes the required parameters, which would not compromise conciseness significantly.

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 simple setter with two parameters and no output schema, the description is too sparse. It fails to explain the effect of the operation, any side effects, or how the tool fits into the broader device management workflow. The schema covers parameters, but context is lacking.

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%, so the baseline is 3. The description adds no extra meaning beyond the schema; it does not explain the format or constraints of the 'appearance' parameter beyond what the schema already provides ('light/dark').

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 'Set device appearance' clearly states the action (set) and the resource (device appearance), effectively distinguishing it from sibling tool 'get_appearance'. However, it does not specify the allowed values (light/dark), which are only in the schema.

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?

No guidance on when to use this tool versus alternatives like 'get_appearance' or other device settings tools. It does not mention prerequisites, such as whether the device must be booted or whether a specific runtime is required.

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