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

Annotations already cover readOnlyHint and openWorldHint, and there IS an output schema, so return format needn't be described. The description adds 'credential-free' and 'normalized' context which is useful, but doesn't disclose pagination behavior, rate limits, or whether data is live vs cached. With annotations covering safety, this is adequate but not rich.

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?

Single sentence, front-loaded with the action and resource. No waste. Slightly terse given the complexity of the tool's domain context (NFT aggregation), but structurally sound.

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?

Given an output schema exists and annotations cover safety, the remaining gap is guidance on when this tool is preferred over coingecko_nfts and what a 'category slug' corresponds to among the many possible values. The description mentions the page pattern but leaves the agent to infer list-tool semantics.

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% with descriptions for slug, page, limit, and vs_currency. The description adds nothing parameter-specific beyond the schema. Baseline 3 is appropriate since the schema does all the parameter documentation work.

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 ('Returns normalized NFT collection rows') and resource (CoinGecko NFT category page), with a concrete URL example. It's clear what the tool does, though it doesn't explicitly distinguish itself from the sibling coingecko_nfts, which likely also returns NFT collections at a broader scope.

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?

No when-to-use guidance is given. The agent is not told when to choose this category-scoped tool over coingecko_nfts or how 'slug' relates to coingecko_categories. It only hints at the input mechanism (category page URL) without articulating the selection criteria.

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