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 explicitly discloses a critical behavior: lower-tier subscriptions receive a 403 error. It also describes the return format (JSON array with specific fields). However, it does not mention optionality of parameters or interaction between them, which is a minor gap.

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 includes extensive lists of parameters and return fields that are already captured in the input and output schemas. This redundancy makes the description longer than necessary. Only the PRO requirement sentence adds unique value, so the description is not concise.

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?

The tool has 8 optional parameters and an output schema, so the description does not need to explain return values. It correctly names the resource and adds the PRO requirement. However, it offers no guidance on parameter combinations or typical usage scenarios, and does not differentiate from sibling financial statement tools, leaving the description only minimally complete for a complex tool.

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 Args section in the description merely restates the exact descriptions already present in the input schema, which has 100% coverage. No additional semantic value is added beyond what the schema provides, so the baseline score of 3 is appropriate.

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 opens with '利润表（财务数据）' which clearly identifies the tool as providing income statement financial data. This distinguishes it from sibling tools like balance_sheet and cash_flow. However, it lacks an explicit action verb such as 'get' or 'retrieve', making the purpose slightly less direct.

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 only usage-related guidance is the PRO subscription requirement ('需要 PRO 及以上套餐'). There is no mention of when to prefer this tool over alternate financial statement tools like balance_sheet or cash_flow, nor any exclusions or alternative recommendations.

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