watchface_get_brightness

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

No annotations exist, so the description must disclose behavior. 'Call Sys/GetBrightness' reveals no behavioral traits such as side effects, permissions, or rate limits. It does not even confirm it is a read operation.

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 extremely concise but at the cost of substance. Front-loading is irrelevant because there is only one short phrase; it is under-specified rather than efficiently spare.

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 nested parameter and no output schema, the description should explain the action and return value. 'Call Sys/GetBrightness' is insufficient.

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% with descriptions for all parameters, so the baseline is 3. The description adds no value beyond the schema; it does not mention parameters at all.

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 'Call Sys/GetBrightness' barely clarifies the purpose beyond the tool name. It indicates calling a system function for brightness but lacks specificity on what it retrieves or the context. It does not differentiate from 17 sibling tools.

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 usage guidelines are provided. The description gives no advice on when to use this tool versus alternatives, no prerequisites, and no context for invocation.

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