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

No annotations are provided, so the description carries full burden. It discloses the cost ($0.01 per call) and data source (adsb.fi), but does not mention rate limits, authentication, or bounding box size limits. Payment info adds value, but missing constraints lower the score.

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 verbose and repetitive, with nearly identical sentences appearing twice. It could be more concise by removing redundancy. The structure is otherwise clear but not optimal.

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, but there is no output schema. The description lists fields (position, altitude, etc.) but does not specify the response structure (e.g., array). For a data retrieval tool, more detail on return format would be helpful.

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 coverage is 100%, so parameters are fully described in the schema. The description repeats the bounding box concept but adds no new semantics beyond what the schema provides. Baseline 3 is appropriate.

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 it returns real-time aircraft states within a bounding box using a specific verb ('get every aircraft') and resource ('aircraft states'). It is distinct from the sibling tools, which are unrelated to flight tracking.

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 mentions it is for 'travel, logistics, airspace-monitoring and tracking agents,' providing context. However, it does not explicitly state when to use versus alternatives or when not to use. Since no sibling tool is similar, this is acceptable but not perfect.

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