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

Annotations already declare readOnlyHint=true and openWorldHint=true, so safety and external-data exposure are covered. The description adds genuine behavioral detail beyond that: the window is computed relative to today, exactly three weekends are returned (nearest plus two after), and each carries a leave-required flag.

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?

Two sentences, no padding, and the return window leads the sentence before the usage examples. Every clause carries information the agent can act on.

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 an output schema present, return-value detail is not required, yet the description still summarizes the payload (dates, days away, leave needed, two following weekends) and the 'from today' computation basis. Nothing needed to call it correctly is missing.

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 coverage is 100% and the single 'country' parameter is fully documented in the schema, including accepted formats (DE or Germany). The description adds nothing about the parameter, so baseline 3 applies.

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?

States a specific resource and scope: the nearest upcoming long weekend in a country, counted from today, plus the two following it. The singular 'next' framing implicitly distinguishes it from the plural sibling find_long_weekends, but no sibling is named so the agent must infer the boundary.

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?

Gives concrete trigger phrasings ('when is the next long weekend?', 'any time off coming up?') that map user intent directly onto the tool. It stops short of stating when NOT to use it or pointing to find_long_weekends/plan_annual_leave as the alternative.

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