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

Annotations already declare the tool as read-only, idempotent, non-destructive, and closed-world, so the safety profile is covered. The description adds useful behavioral context beyond annotations: it is a frozen monthly edition, fragile rows yield only the central count, and prices are asking prices rather than closing prices.

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 front-loaded and dense but purposeful, covering the index scope, metrics, and caveats without filler. The main sentence is long and parenthetical, which slightly reduces readability, but every clause contributes information.

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?

For a read-only one-parameter index tool with an output schema, the description is complete: it explains the source, cadence, segment behavior, returned metrics, and important caveats such as fragile rows and asking versus closing price. Annotations and schema cover the remaining safety and parameter details.

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%, and the single optional segment parameter is fully documented in the schema, including the behavior when omitted. The description reinforces that results are per segment but does not add parameter semantics beyond the schema, so the baseline score of 3 applies.

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 identifies the resource: the Jet Tracker Index for the Brazilian used business aviation market, broken down by segment. It specifies the exact metrics returned, so an agent can tell what the tool does, though it does not explicitly name sibling tools like jt_market_listings or jt_fleet_stats as alternatives.

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?

Usage is implied by the description: it returns the published monthly index, with per-segment fleet base, for-sale counts, share of fleet, and asking prices. There is no explicit guidance on when to use this versus similar siblings such as jt_market_listings or jt_price_history, and no exclusions are stated.

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