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

The annotations already declare readOnlyHint=true, destructiveHint=false, and openWorldHint=true, so safety is covered. The description adds only that output includes example types alongside the class names, which is genuinely useful content context, but says nothing about caching, stability of the list, or why idempotentHint is false for what looks like a static catalog — a discrepancy worth explaining.

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?

One compact sentence with the core purpose front-loaded and the workflow hint appended via a semicolon. Nothing is padded, though the phrasing "and more" is slightly vague where an exhaustive count or pointer would be sharper.

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?

An output schema exists, so return structure need not be restated, and the single optional parameter is fully documented in the schema. What remains thin is the relationship to the search siblings, since the description only gestures at how the ids are consumed elsewhere.

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%: the single optional language parameter has an enum and a description covering defaulting via Accept-Language. The prose adds no further parameter meaning, 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 definition gives a specific verb and resource ("Lists aircraft classes") and enumerates sample values (light, midsize, heavy) so an agent immediately knows the taxonomy being returned. The second clause ties the returned ids to the charter and empty-leg search flow, which partially distinguishes it from the search siblings, though it never explicitly contrasts with them.

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?

"ids filter charter and empty leg searches" implies the intended workflow: call this to obtain class ids before calling the search tools. That is useful implicit routing, but there is no explicit when-to-use statement, no mention of calling it once versus per query, and no named alternative.

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