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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false, and openWorldHint, so the safe-read profile is fully covered by structured data. The description adds only the activeOnly filter behavior and the 'lightweight' nature of the response; it says nothing about result size, ordering, or whether the list is paginated.

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 and well-organized with headings, but the formatting is disproportionate to a one-parameter read tool. The Quick Start sentence largely repeats the Overview and What You Get sections, so several lines do not earn their place.

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?

With no output schema, the description carries the burden of describing returns, and the 'What You Get' section does name the two returned fields (IATA codes and names). It is adequate for a trivial list endpoint, though it omits response shape and size expectations.

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 the single boolean parameter is already documented in the schema. The description restates the same semantics ('Use activeOnly=true to filter out inactive airlines') without adding format or edge-case detail, so it neither helps nor hurts beyond the baseline.

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 overview names a specific verb and resource: retrieve a lightweight list of airline IATA codes with names. The word 'lightweight' implicitly contrasts it with the heavier sibling get_data_flights_airlines, but that sibling is never named, so the agent must infer the distinction.

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?

A dedicated 'When to Use' section lists three concrete scenarios (autocomplete, client-side filtering, code validation), which is clear context. However, it never names an alternative tool or an exclusion condition, so routing among get_data_flights_airlines, get_data_iatacodes, and get_data_flights_airlines_iatas_iatacode is left to inference.

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