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, and it discloses nothing: no indication of whether the data is static or refreshed, how current it is, whether the coverage window is fixed, or what the caller receives. '2026 剩餘' implies a time-relative scope but gives no anchor or update semantics.

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 short, front-loaded sentence with no filler or repetition. It is appropriately sized, though its brevity is partly a symptom of under-specification rather than disciplined editing.

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?

With no annotations, no output schema, and no parameters, the description is the only carrier of information, and it supplies just a topic. An agent cannot tell what form the answer takes, whether the 2026/2027 windows are fixed or rolling, or what a caller should expect to do with the result.

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 takes zero parameters, so there is nothing for the description to disambiguate; the baseline of 4 applies. The description does not need to compensate for schema gaps.

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 identifies the subject matter (Taiwan holidays: remaining 2026 long weekends plus 2027 calendar highlights) but uses a noun phrase with no verb, so it never states what the tool does with that data — return it, summarize it, or something else. It is distinguishable from siblings like convert_currency or entry_requirements, but only by topic, not by action.

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 guidance on when to invoke this tool, what questions it answers, or how it relates to the travel-oriented sibling tools. An agent has no signal about whether this is a lookup for planning, a general reference, or a date-scoped query.

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