compare_exchange_fees

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

Annotations only declare readOnlyHint and openWorldHint; the description adds genuinely new behavioral context — compliance filtering via country code, full VIP tier resolution, referral and optional token discounts, and a defined sort order. It stops short of 5 because nothing is said about error handling, coverage limits, or rate constraints.

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 trigger condition is correctly front-loaded, but the description is essentially written twice in full (Chinese and English), doubling the length without adding information. The parameter hints at the end are useful, but the bilingual duplication is redundant padding.

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 9 parameters, no output schema, and only light annotations, the description carries real weight and handles it: it explains the returned ordering and the referral/token discount components, and flags the country-code compliance requirement. A brief note on what happens when tier inputs are omitted or unknown would close the remaining gap.

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 the baseline is 3. The description goes beyond the schema by telling the agent when to supply monthlyVolumeUsd, useToken=true, and makerShare (0-1), which is decision guidance rather than restated field docs.

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+resource (compare exchange fees) and scopes it well: spot and futures, VIP tier resolution, output sorted by weighted effective fee rate. That scope implicitly distinguishes it from withdrawal-fee or total-cost siblings, but no sibling is named explicitly, so it stops short of a 5.

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?

Gives explicit trigger conditions ('Use when the user asks about crypto exchange fees, fee comparison, or which exchange has the lowest trading cost') plus conditional parameter guidance (pass monthlyVolumeUsd, useToken, makerShare under stated circumstances). It lacks any when-not-to-use or named alternative, so it's a strong but not complete 4.

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