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

The annotations already declare readOnlyHint=true and openWorldHint=true, so the description does not need to restate safety. It adds meaningful behavioral context by disclosing the $0.002 per successful call cost, the x402 payment requirement and supported chains, and that failed calls are not charged. This is valuable operational information beyond the annotations.

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 with the resource and returned fields, followed by scope and pricing details. The long field list is somewhat redundant because an output schema exists, but every sentence still provides useful context and there is no 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?

For a simple one-parameter read-only listing tool with an output schema, the description covers the data source, scope, maximum result count, and cost model. The annotations and output schema supply the remaining structured context, so an agent has enough information to invoke it correctly.

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 limit parameter is already fully documented in the schema with its 1-100 range and default of 10. The description adds only the 'Up to the top 100' scope, which largely duplicates the schema, so the baseline 3 is appropriate.

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 a specific resource: CryptoRank top crypto projects by rank, including the exact fields returned and the API version. It distinguishes itself from generic market-data siblings by naming CryptoRank as the source, though it does not explicitly contrast with the many other crypto listing tools.

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 CryptoRank source and the 'top projects by rank' scope, which tells an agent this is for ranked project listings. However, it gives no explicit guidance on when to choose this over similar siblings such as finance_coinmarketcap, finance_coingecko, or finance_coinlore_crypto.

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