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

No annotations are present, so the description carries the full burden. It usefully discloses that the data is live, geographically bounded, and sourced from OpenSky, but it does not describe error behavior, the empty-q case, or any other operational traits.

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 a single compact sentence that front-loads the purpose and adds the key radius and source details. The opening 'Flights Nearby:' partially restates the title, but there is no meaningful wasted content.

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?

Although the tool is simple and has an output schema, the missing q format is a blocking ambiguity, and there is no usage guidance. The description is too thin to ensure correct invocation without prior knowledge of the tool.

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, q, is a generic string with 0% schema description coverage. The description says 'coords' but does not specify the expected coordinate format (e.g., lat,lon vs lon,lat vs DMS) or how the default empty value should be handled, so an agent cannot reliably construct a valid call.

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 clearly states that the tool returns live aircraft near given coordinates, with a defined geographic scope (~1°) and a named data source (OpenSky). It lacks an explicit verb, but the behavior is unambiguous and distinct from the sibling tools.

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?

There is no guidance on when to use flightsnear versus any alternative, nor any statement about when it is not appropriate. The intended use is only implied by the description, and no sibling tools are mentioned.

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