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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered without description help. The description adds that results bundle coordinates and booking links from multiple sources, which is useful, but it says nothing about latency, result limits, or whether booking links carry commercial terms.

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 states the payoff first and then lists outputs, with no filler or restated name/title. Every clause carries information.

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 multi-source aggregator with no output schema, the description does sketch the return payload (hotels, sights, food, booking links), which is the right instinct. However, with five parameters at 20% schema coverage and no output schema, an agent still lacks the parameter guidance and response-shape detail needed to call it confidently.

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 only 20% — check_in is the sole documented parameter, and the description adds no parameter meaning whatsoever. Nothing explains what values 'interests' accepts, how 'days' interacts with the returned itinerary length (default 3, max 14), or how 'travellers' affects hotel options, leaving the description to compensate for a real gap that it ignores.

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 names a concrete deliverable (a day-by-day itinerary) and enumerates its contents: hotel options, sights, food spots with coordinates, and booking links. The phrase 'in one call' implicitly distinguishes it from the single-purpose siblings (find_food_spots, search_hotels), though it never names them 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 only implied: an agent can infer this is the aggregator to reach for when a full itinerary is wanted instead of several individual find_* calls. There is no explicit when-to-use statement, no exclusion of cases where a targeted search would be cheaper, and no prerequisites such as a required city.

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