get_device_status

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

Annotations declare readOnlyHint=true, and the description aligns with this by framing the operation as 'Get information' — no contradiction. The description adds value by specifying what kind of information is returned (model, brand, OS version, etc.), which helps the agent anticipate output. It doesn't cover edge cases like device-not-connected errors, but for a read-only info tool, the coverage is reasonable.

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, efficient sentence that gets straight to the point. It's front-loaded with the core purpose and enumerates example fields for concreteness without padding. Slightly more structure (e.g., a separate note on return behavior) could help, but it's appropriately lean for a zero-parameter tool.

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?

Given 0 parameters, a readOnlyHint annotation, no output schema, and low conceptual complexity, the description is largely sufficient. What's missing: no explicit mention of failure modes (e.g., what happens when no device is connected), but for a zero-param info retrieval tool, the description covers the essentials well.

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 0 parameters, and with no params, the baseline is 4 per the rubric. There are no parameters to document, so semantic gaps don't apply. The description appropriately explains what the tool retrieves rather than trying to document nonexistent parameters.

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 specific verb+resource ('Get information about the connected phone device') and enumerates example fields (model, brand, OS version), making the purpose clear. However, it doesn't explicitly distinguish itself from sibling tools, though the sibling set (memory, tasks, screenshots) is clearly different enough that no confusion is likely.

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 implies usage context (checking device details) but provides no explicit when-to-use guidance or exclusions. With 8 siblings spanning memory, task, and screen operations, the absence of any 'use this for X, not Y' type guidance leaves some room for ambiguity, though the tool's domain (device info) is fairly self-apparent.

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