set_display_brightness

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

Annotations already record that this is a non-read-only, non-idempotent, non-destructive operation, but the description adds no behavioral detail beyond the word 'Set'. It does not mention value bounds, side effects on connected displays, or whether the change is applied immediately.

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, front-loaded sentence with no filler. It is concise, though the brevity comes at the cost of essential parameter and usage 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 setter with one parameter and no output schema, the description is incomplete: an agent cannot know whether 'value' expects 0-100, 0-255, or another scale, nor what the tool returns. More detail is needed for correct invocation.

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?

With 0% schema description coverage, the description must clarify the 'value' parameter, but it only implies that it is the brightness level. It fails to specify units, valid range, or scale, leaving an agent to guess the correct integer.

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 states a clear verb and resource: it sets screen brightness, which distinguishes it from get_display_brightness and other display tools. It does not explicitly contrast itself with sibling tools like set_night_light, but the purpose is unambiguous.

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?

There is no guidance on when to use this tool, what value range is acceptable, or how it relates to alternatives such as get_display_brightness or set_night_light. The intended use is only implied by the tool's name and brief description.

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