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

Annotations already declare readOnly/idempotent/non-destructive, so the safety profile is covered; the description adds operator-relevant behavior beyond that — the Foreca data source and attribution duty, the data-only (non-booking) nature, the place_url handoff, and the mandatory downstream render_destination_weather call.

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?

Front-loaded with scope and exclusions, and every clause carries actionable content (attribution, render step, booking exclusion). It is on the long side with several short imperative sentences that could be consolidated, but nothing is wasted.

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?

Since an output schema exists, return values need not be explained, and the description still covers the source, the attribution requirement, the downstream render step, and the booking boundary. An agent has everything needed to call it and follow through correctly.

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%, so the baseline is 3; however the description adds routing meaning beyond the schema by requiring a sitemap-style handle and instructing the agent to call resolve_destination first when it only has a city/country/airport name. That extra constraint is genuinely useful, though it is partly usage guidance rather than parameter semantics.

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 opening sentence states a specific verb and resource ('Get current weather, forecast, climate, and best time for one place') and immediately differentiates from the sibling get_destination_info by naming the generic-info case it does NOT cover. An agent can select it without opening a schema.

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?

Explicit when-to-use triggers (current weather, 7-day forecast, monthly climate, 'when should I go'), explicit when-not-to-use examples, and named alternatives (get_destination_info, resolve_destination, render_destination_weather). It also clarifies there is no separate best-time tool, closing a likely routing ambiguity.

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