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

Annotations already cover the safety profile (read-only, idempotent, non-destructive), so the bar is lower. The description adds minimal behavioral context beyond the annotations, only hinting at aggregation scope with 'route aggregates.' It does not describe output format, time coverage, or reliability metrics.

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?

The description is short and starts with the main verb, which is good. However, the repeated word 'loaded loaded' and the unclear term 'route aggregates' make it less polished and precise than it could be.

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?

Given the tool has a single well-documented parameter and rich annotations, the description is not severely incomplete. Yet the lack of an output schema and the cryptic 'loaded loaded route aggregates' leave ambiguity about what signals are actually returned, so more context would help.

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?

The only parameter, airport_code, is fully documented in the schema with an example (ATL). The description itself adds nothing about parameters, but with 100% schema coverage the schema carries the burden, so the 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 uses a clear verb ('Summarize') and identifies the resource ('an airport') and the subject ('delay and reliability signals'), which differentiates it from airline- or route-level flight tools. However, the phrase 'across loaded loaded route aggregates' is vague and contains a typo, which slightly obscures the exact scope.

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 description implies this tool is for airport-level delay/reliability summaries, which gives some basis for selecting it over flight_route_summary or flight_airline_reliability. But it does not explicitly state when to use it or exclude other flight-related siblings, leaving the choice somewhat to inference.

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