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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, covering the safety profile. The description adds useful non-obvious behavior by stating that searches come pre-filled from the traveler's home airport and include the drive from each gateway airport to the resort. It does not, however, disclose what the response contains (fares, airlines, drive times).

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 front-loaded sentence that conveys the tool's scope and its distinguishing feature (gateway airports plus drive time) without filler. Slightly clause-heavy 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?

For a read-only, idempotent search tool with full schema coverage and annotations carrying the safety profile, the description supplies the essential purpose and the notable pre-filled/drive-time behavior. Only return-value expectations are left unspecified, which is acceptable since no output schema exists but is not strictly required here.

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 all six parameters (including adults, depart, return, childrenAges) are already documented in the schema. The description only restates the from/to flexibility ('or any airport code') and adds no new syntax or format detail, so the baseline of 3 is appropriate.

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 verb (searches flights) and resource (pre-filled flight searches to gateway airports for a resort), and clarifies the destination can be a resort or any airport code. It is clearly distinguishable from search_beach_resorts or find_lodging, though it never names a sibling explicitly.

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 (flight search to a resort) and the input schema makes the trip-planning context obvious, but there is no explicit when-to-use guidance, no mention of prerequisites, and no routing against alternatives like find_lodging or plan_trip.

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