index_option_50index_qvix

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

Annotations already declare the operation as read-only, idempotent, and non-destructive. The description adds the return type (pandas.DataFrame) and a source URL, providing some behavioral context beyond the annotations, but it does not disclose response structure, data frequency, or potential limitations such as missing historical data.

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 essential information, but it redundantly repeats the same phrase multiple times (title, description, return, rtype). This repetition wastes a sentence but the overall length remains acceptable.

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?

For a no-parameter data retrieval tool, the description provides the core information (what data and return type) and a reference URL. However, it lacks details about the DataFrame's columns, date range, or whether it returns historical or current data, leaving some ambiguity despite the annotations indicating a safe read operation.

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?

This tool accepts zero parameters, so the empty schema requires no explanation. The description correctly notes the return type but adds no parameter semantics, which is appropriate given the absence of parameters. The baseline of 4 applies here.

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 identifies the data as the SSE 50 Stock Index Option Volatility Index (QVIX) with a source URL, making the tool's purpose understandable. It distinguishes from sibling tools that target other underlyings (e.g., 50etf) through the explicit '50index' designation, though it does not clarify the daily vs. minute granularity offered by sibling tools.

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 alternative QVIX tools (e.g., index_option_50index_min_qvix or index_option_50etf_qvix). The description only states what data is returned, not the selection criteria, prerequisites, or scenarios where this tool is preferred.

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