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

Annotations already cover the safety profile with readOnlyHint, openWorldHint, idempotentHint, and destructiveHint. The description adds useful behavioral context by stating that results distinguish free versus paid sources and that access/integration caveats are included. It does not detail the output format, but with annotations carrying the safety burden this is a reasonable level of transparency.

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 one tightly worded, front-loaded sentence. The core action and scope appear immediately, and the caveats promise adds meaningful information without filler. It is appropriately sized for a low-complexity, two-parameter tool.

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?

The tool is simple, with only two optional parameters and no output schema, and the description conveys what the directory offers. However, an agent still lacks guidance on how to use the query and category parameters, which keeps this from being fully complete.

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 0%, and the description does not explain what 'query' or 'category' mean or how they affect results. With two undocumented parameters and no enums, the description should compensate for the schema gap, but it does not.

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 specific verb ('Discover') and names concrete resource types: aviation APIs, regulatory portals, and licensed suppliers. It also communicates a clear differentiator by distinguishing free versus paid sources, which positions this as a directory tool rather than an analysis or events tool. It does not explicitly differentiate itself from sibling tools by name, so it falls just short of a 5.

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 the tool should be used when someone wants to find aviation/aerospace data sources with cost and access caveats. However, it provides no explicit when-to-use versus when-not-to-use guidance, and none of the many sibling tools are referenced as alternatives. This is implied usage only.

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