openpanel_get_device_data

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

No annotations are provided, so the description must carry full disclosure burden. It fails to indicate whether this is read-only (presumed but not stated), what the return format looks like, rate limits, or pagination behavior. The only behavioral note is the project_id environment fallback.

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 appropriately brief at two sentences. Information is front-loaded with the purpose first, followed by the parameter note. The '[UNIFIED]' prefix adds confusion without value, otherwise structure is efficient.

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 five parameters with zero schema documentation, no annotations, and no output schema, the description is insufficient. A data retrieval tool of this complexity requires documentation of date formats, breakdown categories, and response structures, which are absent.

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?

With 0% schema description coverage across 5 parameters, the description inadequately compensates. It only explains project_id's optionality. It fails to document the 'breakdown' parameter values (implied to be device/browser/OS but not explicitly mapped), 'date_range' format, or 'limit' constraints. The parameter semantics are largely undocumented.

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 tool retrieves a 'device/browser/OS breakdown of users' with specific resource types listed. However, it doesn't explicitly distinguish when to use this versus sibling analytics tools like openpanel_get_geo_data or openpanel_get_overview_report, and the '[UNIFIED]' prefix is unexplained noise.

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 concrete usage guidance noting that 'project_id is optional if configured in environment,' which helps users know when they can omit the parameter. However, it lacks strategic guidance on when this tool should be preferred over other OpenPanel reporting tools or what prerequisites exist.

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