Get Device

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

No annotations are provided, so the description carries the full disclosure burden. It is clearly a read operation and it enumerates the returned data, but it does not state what happens if the device is offline, uninstalled, or the identifier is invalid, nor whether the call blocks or times out. Adequate but with real gaps for an unannotated tool.

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?

Two short sentences, zero filler, with the resource and its returned fields front-loaded before the optional-parameter note. Every clause carries information the agent needs.

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 single-optional-parameter read tool with an output schema and no annotations, the description covers purpose, output scope, and the default fallback. What remains missing is error/offline behavior and identifier format, which are not covered by the schema either.

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 0%, so the description must compensate, and it does add one genuinely useful instruction: the parameter may be omitted to fall back to the default device. However, it never says what form a device identifier takes (serial, index, alias) or how to obtain one, leaving the only parameter partially specified.

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?

Specific verb+resource ("Get full status of one device") followed by an enumeration of exactly what is returned: boot state, Android version, screen size, foreground app. The singular "one device" implicitly contrasts with the sibling list_devices, but no sibling is named explicitly, so differentiation is left to inference.

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 explicit when-to-use vs when-not guidance, and no mention of how this differs from the sibling `foreground` tool, which appears to overlap on the foreground-app portion of the output. Usage is only implied by the read-status framing; the one line of guidance given ("Omit `device` to use the default") is a parameter default, not a selection rule.

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