index_option_cyb_qvix

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

Annotations already declare readOnlyHint=true and idempotentHint=true, so the safety profile is covered. The description adds a source URL and return type (pandas.DataFrame), but no behavioral traits such as data updates, rate limits, or whether it returns historical or current values.

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 short and front-loaded with the title. However, it repeats the same phrase in the description, return, and rtype lines, which is slightly redundant. Overall, it is efficient for a tool with no parameters.

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 description does not specify the data frequency (daily vs. minute), which is a critical gap given the existence of the sibling 'index_option_cyb_min_qvix'. It also does not clarify what data range or columns the DataFrame contains, making it incomplete for an agent to understand the tool's output.

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 zero parameters, so the schema is fully covered. Per the baseline for 0 params, the description does not need to add parameter details, and it provides the return type, which is helpful.

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 the resource ('创业板 期权波动率指数 QVIX') and provides a source URL, but it lacks an explicit verb like 'get' or 'fetch'. It does not differentiate itself from the similarly named sibling 'index_option_cyb_min_qvix', leaving ambiguity about whether this is the daily or minute-level index.

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 given on when to use this tool versus alternatives. There is no mention of data frequency, time range, or any prerequisites, making it impossible for an agent to decide between this and the many other QVIX tools.

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