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

No annotations are provided, so the description carries the full burden. It does disclose the content shape (nine 3+ day weekends, 1–5 day leave combos per weekend, one example), which helps an agent anticipate the return. It says nothing about whether the data is static/precomputed, whether results are paginated or localized, or any access constraints.

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 tight sentence with the resource and the example front-loaded; no filler. The bracketed prefix tag is slightly redundant but costs little.

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 no-param, no-output-schema lookup, the description covers what the tool returns and gives a concrete illustrative example, which is enough for correct invocation. The missing piece is routing versus the near-duplicate sibling tools.

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?

Zero parameters, so the schema imposes no semantic burden and the baseline is 4. The description correctly implies a parameterless, fixed-scope lookup.

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 concrete resource — Taiwan's nine 2027 (ROC 116) long weekends of 3+ days plus the optimal 'take N days off' combinations — and even gives a worked example (春節請5休16). However, it never distinguishes itself from the very similar sibling travel__plan_leave_2027, and the leading tag '訂票' (ticket booking) suggests a booking capability the tool apparently does not have.

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, when-not-to-use, or alternative-tool guidance. With overlapping siblings such as travel__plan_leave_2027, travel__ticket_booking_guide, trip__taiwan_holidays and life__get_holidays, the agent is left to guess which one to call.

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