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

Annotations already declare readOnlyHint, idempotentHint, destructiveHint=false and openWorldHint, so the safety profile is covered. The description still adds real behavioral context beyond that: it resolves IPFS URIs and restricts lookups to EVM chains, which tells the agent something the annotations do not. It lacks failure-mode detail (missing/burned tokens, off-chain metadata unavailable).

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?

Three short sentences, front-loaded with the action and returned fields, followed by the IPFS behavior and the chain restriction. Every clause carries information 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?

An output schema exists, so return values need no explanation, and the annotations plus full param coverage mean the description only needs to add scope and behavior. It largely does, though it omits what happens for non-existent tokens or unresolvable metadata, which would matter for an agent handling failures.

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?

With 100% schema description coverage across all three parameters, the schema already documents contract, tokenId and chain (including the full chain enum and default). The description adds no parameter-level syntax, format, or address-normalization detail, 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 individual NFT token metadata') and enumerates the returned fields (owner, tokenURI, image, attributes), which implicitly separates it from the collection-level siblings nft.collection and nft.holders. It stops short of explicitly naming those siblings as alternatives, so an agent must infer the boundary.

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 'individual NFT token' versus collection-level siblings, and 'EVM chains only' sets a scope constraint, but there is no explicit when-to-use, when-not-to-use, or named alternative. No prerequisite guidance (e.g., needing a contract address for a deployed ERC-721/1155) is given.

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