U-App get custom event data

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

No annotations are provided, so the description carries the full burden. It only states the basic function 'get statistics' without disclosing behavioral traits like read-only nature, required permissions, rate limits, or what the returned data represents (e.g., count, distribution).

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 extremely concise with no wasted words, using a single sentence plus a reference. However, it could be structured more clearly by separating the action from the API reference or including key details in a bulleted format.

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 the lack of output schema and annotations, the description provides minimal context. It does not explain the return format, whether results are aggregated or daily, or how to interpret the statistics. For a data-fetching tool, this is insufficient.

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?

All parameters are described in the input schema (100% coverage). The description adds no additional meaning beyond the schema, such as date format details or event name constraints. Baseline 3 is appropriate as schema already provides sufficient semantic information.

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 action 'Get statistics' and the resource 'custom event', linking to the official API. It is distinct from siblings like umeng_uapp_event_list (list events) or umeng_uapp_event_get_unique_users (unique users) by focusing on statistics, but does not explicitly differentiate from all siblings.

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 guidance is provided on when to use this tool versus alternatives, such as umeng_uapp_event_param_get_data for parameter data. There are no usage conditions, prerequisites, or exclusions mentioned.

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