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

No annotations are provided, so the description carries the full burden, and it does disclose the key behavioral trait: results are ranked by net profit. It omits the assumptions behind that calculation (default cash payout, how tax and shipping are folded in) and does not state that the tool only computes and has no side effects.

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?

A single well-formed sentence that front-loads the action and the resource with zero filler. It is efficient, though the brevity tips into under-specification rather than true conciseness for a tool with 10 inputs.

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?

This is a complex tool: 10 parameters, one enum, one nested object, no output schema and no annotations. A one-sentence description leaves the agent without guidance on defaults, marketplace coverage, or what the ranked comparison returns, so it is not complete enough for the tool's complexity.

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?

With 10 parameters at 60% schema description coverage and a nested payoutMethod object, the one-sentence description mentions none of them. It implies that costBasis, shippingCost and fee-related inputs feed the net profit figure, but it adds no meaning beyond the field-level schema descriptions.

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?

States a specific verb and resource ('Compare all marketplaces') plus the ranking criterion ('ranked by net profit') and the domain ('card sale'), so the operation is immediately identifiable. It does not distinguish itself from siblings calculate_fees or evaluate_flip, leaving the agent to infer which one to pick.

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?

There is no explicit when-to-use or when-not guidance and no mention of the sibling tools. The phrase 'Compare all marketplaces' hints at the use case, but nothing tells the agent why it would choose this over calculate_fees or evaluate_flip.

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