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

With no annotations, the description carries the full burden; it usefully discloses that data is end-of-day rather than real-time and that it covers TWSE/TPEx markets, which prevents a mistimed query. It omits what happens on an unknown ticker, whether the response is a single record or a list, and any rate or availability limits.

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?

Two short bilingual sentences, each front-loaded with the resource and the key caveat ('非即時' / 'not real-time'). The duplication costs some tokens but keeps the definition readable for either language.

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 one-parameter read tool with no output schema, the description covers purpose, market scope, and non-real-time behavior, which is close to sufficient. It falls short on return shape, invalid-input behavior, and how it differs from the overlapping stock_dividends sibling.

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?

Schema coverage is 0%, so the description must compensate; saying the single query accepts a ticker code or a name adds real meaning beyond the bare 'query' string. It still lacks format examples (e.g., numeric code vs Chinese name) and doesn't state whether partial matches are accepted.

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 names a specific resource (TWSE/TPEx end-of-day quote) and what it returns (price, PE ratio, dividend yield) by code or name. It does not, however, distinguish this tool from the sibling stock_dividends, which overlaps on the dividend-yield data.

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?

'by code or name' and 'not real-time' imply usage context, but there is no explicit when-to-use or when-not-to-use guidance, and no routing to alternatives such as tra_live for real-time data or stock_dividends for dividend detail.

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