device_info

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

No annotations are available, so the description carries the burden of behavioral disclosure. It conveys that the tool returns device metadata and implicitly suggests a read-only operation, but it does not explicitly state side effects, connection requirements, or error behavior. This is adequate for a simple getter but not deeply transparent.

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, with the returned fields front-loaded and the practical use cases in a short second sentence. No filler or redundant wording exists.

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 low-complexity read-only tool with an output schema, the description covers the main purpose and practical context. It lacks parameter guidance and sibling differentiation, but the tool is simple enough that the description is mostly complete.

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 description coverage is 0%, and the description does not mention the serial parameter at all. The parameter name is self-explanatory, but there is no explanation of how it selects a device or what happens when it is omitted, leaving a noticeable gap.

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 identifies the resource (device) and enumerates the returned data: manufacturer, model, Android version, SDK level, and build. It lacks an explicit verb and does not contrast itself with sibling tools like device_capabilities or device_list, so it is clear but not fully differentiating.

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?

It explicitly states when the tool is useful: before any automation and when deciding upgrade options for older devices. It does not mention exclusions or alternatives, but the provided context gives a solid sense of appropriate usage.

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