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 the core read-only behavior (fetching time and trading-day info) but does not disclose details such as timezone, data source, network dependency, or the structure of the trading-day information. Adequate for a simple utility but not rich.

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 sentence that front-loads the core function and appends the usage recommendation. Every part earns its place with zero waste.

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 description covers what the tool does and when to use it, which is good for a zero-parameter utility. However, with no output schema present, the description does not explain the return format (timezone, date format, or what 'trading day information' includes), leaving the agent to infer the output.

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 100% schema coverage, so the baseline of 4 applies. There is no parameter information needed in the description, and nothing is missing.

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 clear verb and resource: obtaining current system time plus A-share trading day information. It is specific enough to convey what the tool does, though it does not explicitly differentiate itself from the calendar-related sibling tools (calendar_seed, calendar_upcoming, etc.), 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?

The description gives explicit usage context: '建议在调用其他需要日期参数的工具前使用该工具' (recommended to use before calling other tools that need date parameters). This tells an agent when to invoke it, even though it does not mention excluded scenarios or alternative tools.

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