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

With no annotations, the description carries the full burden. It does disclose the return payload (markdown table, page URL, booking dates, holidays used, factor) and scope (six best, non-overlapping), but says nothing about permissions, rate limits, caching, or why the list is capped at six. Read-only intent is only implied.

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 dense sentence that front-loads the core result and then the output contents. No filler, though the parenthetical examples make it slightly long.

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 output schema and only three well-documented parameters, the description usefully compensates by describing the returned fields (booking dates, holidays used, factor, markdown table, URL). Enough for an agent to call correctly, though boundary behavior (invalid region, out-of-range year) is unaddressed.

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 description coverage is 100%, so the schema already documents year, locale and region with examples and defaults. The description only gestures at 'of a year for a region' and adds no syntax or format detail beyond the schema; 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?

The description states a specific verb and resource: it returns the six best non-overlapping vacation levers for a region, with defined types (classic bridge days, holiday clusters). It is clear what the tool produces, though it never names or contrasts with siblings such as plan_vacation or public_and_school_holidays.

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?

Usage is implied by the content (planning vacation around bridge days), but there is no explicit statement of when to choose this over plan_vacation or public_and_school_holidays, and no prerequisites or exclusions. The agent must infer the selection context.

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