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

Annotations already declare openWorldHint=true, destructiveHint=false, and readOnlyHint=false, covering much of the safety profile. The description adds that results include uncertainty bands and are bounded to 1-15 day horizons, which is useful output context. It says nothing about data freshness, as_of_date semantics, or any cost/rate behavior though.

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?

Two tight sentences with the core purpose and scope front-loaded and the intended use case second. Every clause earns its place and there is no filler.

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?

With an output schema present, return values need not be explained, and the annotations carry the safety profile. The remaining gap is the undocumented as_of_date parameter and lack of guidance on default horizon behavior, but for a forecast tool this is largely 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 coverage is 67%: days_ahead and airport_code are documented in the schema, but as_of_date has no description anywhere. The description reinforces the 1-15 horizon and airport scope, but adds no format or semantics beyond what the schema already states, so the 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?

Names a specific verb (projection/forecast), resource (avgas/jet fuel price), and scope (airport, 1-15 day horizons), which is unambiguous. No sibling tool offers fuel forecasting, so explicit differentiation isn't needed, but the description also stops short of contrasting itself with cost/market siblings like estimate_cost_of_ownership or get_market_metric.

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?

'For trip budgeting and FBO economics' implies the intended context, giving some indication of when it is useful. However, there is no explicit when-to-use versus when-not, no mention of alternatives, and no prerequisites stated, leaving usage to inference.

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