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

No annotations are present, so the description carries the behavioral disclosure burden. It discloses that the tool calculates specific cost outputs and that missing inputs fall back to defaults, which is useful. However, this fallback behavior is already evident from schema defaults, and the description does not disclose return formatting, side effects, or units.

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 compact and effectively front-loaded with a colon-led list of outputs, followed by a useful fallback note. Every sentence contributes relevant information, though the structure could be slightly more polished.

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?

Given 9 parameters, no annotations, and no output schema, the description provides the output categories but leaves return shape, units, and interpretation details unspecified. It also omits any relationship to sibling tools, so an agent must rely on inference; adequate overall but with clear gaps.

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%, so the baseline of 3 applies. The description adds no parameter-level meaning beyond the schema; it mentions output dimensions like 'per flight hour' and 'per year', but these are outputs, not parameter explanations.

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 and resource, 'Run the Jet operating cost model calculator', and clearly enumerates the four outputs it produces. It does not explicitly distinguish itself from sibling tools, but those are describe/enquiry tools, so the purpose is unambiguous.

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 offers no explicit when-to-use guidance or alternative routing, but the note that missing inputs fall back to documented defaults implicitly tells callers they can invoke the tool with partial input. Sibling tool names suggest the context, but no direct exclusions or conditions are provided.

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