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

Annotations already declare readOnlyHint, idempotentHint, openWorldHint and destructiveHint=false, so the safety profile is covered. The description contributes the ranking methodology (Transfer event count in recent blocks), which is real behavioral context, but the EVM-only constraint it states is already repeated verbatim in the chain parameter schema description.

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, front-loaded with the core purpose before the qualifying detail. Nothing is redundant or padded.

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 and annotations covering the safety profile, the description only needs to establish scope and ranking semantics, which it does. Minor omission: no hint of result volume or ordering beyond 'recent blocks', though the output schema likely handles that.

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%: both `chain` (with its long enum and explicit Solana exclusion) and `hours` (lookback window, 1-6 bounds) are fully documented in the schema. The description adds no syntax or format detail beyond that, so the baseline 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?

States a specific verb and resource ('Get trending tokens') and pins the ranking mechanism to on-chain Transfer event volume, which separates it from token.price or predict.token_momentum. It doesn't explicitly name a sibling it is not, but the mechanism and EVM scoping make the tool's identity 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?

Usage is implied by 'trending tokens' (discovery of what's moving now), but there is no explicit when-to-use statement and no routing to alternatives like token.screener or predict.token_momentum. Adequate but leaves the agent to infer the context.

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