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

No annotations are provided, so the description carries the full behavioral burden. It says what it builds but not what the return value looks like (a list of URLs? per-engine?), whether any network call occurs, or whether output is deterministic. For a stateless generator this is low-risk, but the disclosure is thin.

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?

A single well-structured sentence: toolbox label, then the action and target engines, then the parameter list. It is front-loaded and free of filler. The bracketed toolbox prefix is arguably redundant but small.

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 6-parameter generator with no output schema and no annotations, the description covers purpose and parameter meaning but omits the shape of the output (URLs per engine) and any behavioral notes. It is adequate but not fully complete given the missing structured metadata.

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 description coverage is 0% across 6 parameters, so the description must compensate. The parenthetical list (關鍵字, 完全符合, 排除字, 限定網站, 檔案類型, 時間) does map semantically onto q, exact, exclude, site, filetype and time, giving the agent field meaning. However it provides no syntax, format, or delimiter guidance for those fields, leaving the compensation only partial.

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 a specific verb and resource: generate advanced search URLs for five named engines (Google, Bing, Yahoo Kimo, Baidu, YouTube) in one call. This clearly conveys what the tool does. It does not, however, distinguish itself from the sibling seo__search_operators, which plausibly overlaps in scope, so it stops short of a 5.

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?

There is no when-to-use guidance, no mention of alternatives (e.g. seo__search_operators vs seo__serp_preview), and no prerequisites or exclusions. The usage context is only implied by the tool's nature as a URL generator.

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