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

Annotations cover readOnlyHint and openWorldHint, so the safety profile is handled. The description adds genuinely new behavioral context: the $0.001 x402 payment requirement and the fact that figures are derived solely from public chain state rather than any external price feed. It stops short of describing latency or rate limits, so not a 5.

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 single dense paragraph is front-loaded with the core capability and ends with the payment terms, and every clause adds concrete information (chains, pool depth, confidence). It is slightly long, but no sentence is 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?

A read-only tool with no output schema, so the description reasonably covers what comes back (pool depth, confidence, 24h change, APY, market size) and the cost model. It leaves some gaps around response shape and error behavior, but is largely sufficient for correct invocation.

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 schema already documents tokens, change_24h, and yields_chain with examples and enum. The description only adds marginal interpretation, e.g. clarifying the yields screener returns supply/borrow APY and market size, which is the baseline 3 given the schema does the heavy lifting.

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 (computes live token prices) and resource (on-chain DEX pools across named chains), plus a secondary Aave V3 yield screener. The data-source detail and chain list make it clearly distinguishable from siblings like token_report, token_verdict, or wallet_portfolio.

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?

The description conveys context (derived from public chain state, no third-party feed) and a paid x402 cost, which implies when it's appropriate versus free feeds. However, it never explicitly names an alternative tool or states when-not-to-use, so usage selection is left to inference.

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