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

Annotations already declare openWorldHint=true and destructiveHint=true, so the safety profile is partly covered externally. The description itself adds no behavioral context at all — nothing about caching (no_cache), the latency cost of deep_search, token-based multi-step flows, or credit consumption. For a 32-parameter scraper with non-trivial side effects, this is a meaningful gap.

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 with zero filler. It is efficient, though for a 32-parameter tool with a multi-step booking workflow the extreme brevity borders on under-specification rather than optimal conciseness.

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?

This is a complex tool — 32 params, no output schema, round-trip/multi-city flows involving departure_token and multi_city_json — yet the description is one trigger clause. It omits the two-step selection workflow and cost/latency trade-offs that an agent needs to call it correctly, so it is not complete for the tool's complexity.

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% and every one of the 32 parameters carries its own inline description, so the schema does the heavy lifting. The tool description supplies no additional parameter meaning, which matches the baseline 3 for fully documented schemas.

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 specific verb and resource (查询 Google Flights 航班信息/机票价格) and enumerates the concrete query dimensions it supports (round-trip/one-way/multi-city, cabin, airlines, stops, baggage, emissions). It clearly distinguishes this from sibling search tools. However, it is framed as a trigger condition rather than a purpose statement and does not explicitly differentiate itself from e.g. google_hotels or google_search.

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?

The entire sentence is a when-to-trigger condition, so usage context is implied and reasonably clear. It never states when NOT to use it, nor names an alternative tool, and it omits key prerequisites such as needing a departure_id/outbound_date before it is useful.

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