获取当前时间及A股交易日信息

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It conveys a safe read-only operation and indicates the output includes system time and A-share trading day information, but it does not specify timezone, return format, or the exact content of '交易日信息'. Basic transparency is present, but richer details are missing.

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 a single, front-loaded sentence: it first states the main function, then gives a practical usage recommendation. There is no filler or redundant content, making it highly concise and well-structured.

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 tool is simple with zero parameters and no output schema, so the description does most of the work. It clearly explains the purpose and implies the output can be used as a date parameter for other tools, though it does not explicitly define the return structure. Given the low complexity, this is adequately complete.

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, and the input schema is an empty object, so the description need not document parameter syntax. The baseline for zero-parameter tools is 4, and the description adds a useful hint that its output can be used to fill date parameters in other tools.

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 states the tool's function: '获取当前系统时间及A股交易日信息' (get current system time and A-share trading day information). This is a specific verb+resource combination that distinguishes it from sibling market-data 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?

The description explicitly recommends using this tool before calling other tools that require date parameters ('建议在调用其他需要日期参数的工具前使用该工具'). This provides clear usage context. It does not list exclusions or alternatives, but the recommendation is strong enough for a utility tool.

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