index_option_50etf_qvix

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

The description adds only a source URL and a DataFrame return type. It does not disclose what columns or time period the DataFrame contains, whether it is historical or current, or any other behavioral traits. Annotations already cover read-only and idempotent safety, so the description's minimal extra information is insufficient for behavioral transparency.

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 but contains redundancy: the same phrase '50ETF 期权波动率指数 QVIX' appears as the first line and again in the ':return:' section. The URL is a useful addition, but the layout is awkward and the repetition wastes space.

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 no output schema, the description should compensate by describing what the returned DataFrame contains and the data frequency. It does not. It also fails to clarify that this is the daily (non-minute) version, which is important context given similar sibling tools.

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 input schema is trivially complete. The description does not need to explain parameter meanings, and the absence of parameters makes this dimension not a concern.

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 essentially restates the tool's name/title: '50ETF 期权波动率指数 QVIX' appears verbatim from the annotations. It lacks an action verb or explicit statement of what the tool does, aside from the docstring's ':return:' line indicating it returns the index. This is closer to a tautology than a clear purpose statement.

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 no guidance on when to use this tool versus alternatives. It does not mention that this is the daily (non-minute) variant, nor does it distinguish it from sibling tools such as index_option_50etf_min_qvix or other QVIX indices.

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