get_display_brightness

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

The description discloses the underlying HTTP GET request and the return object (DisplayBrightnessInfo with an integer value), making the read-only nature clear. Given the absence of annotations, this is good coverage, though it does not address potential errors or edge cases.

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 well-structured with a clear lead sentence, technical detail, return type, and use case. It is slightly longer than strictly necessary but each sentence adds value, so it is appropriately sized without waste.

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 getter with no output schema and no annotations, the description is remarkably complete. It explains the purpose, the HTTP method, the return type and field, and a relevant use case. This fully equips an agent to use the tool correctly.

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?

The tool has no parameters, so the baseline for this dimension is 4. The description does not need to add parameter semantics since the schema is empty and no parameter information is provided or required.

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 clearly states the specific action ('Retrieve the display brightness setting') and the resource ('Busy Bar device'), distinguishing it from the many sibling get_* tools that retrieve different settings. The verb 'retrieve' is precise and the resource 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?

The description provides explicit use cases ('Check brightness before adjusting display behavior, or audit settings during device configuration management') which clarifies when to use the tool. However, it does not discuss alternatives or when not to use it, so it stops short of a 5.

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