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

Annotations already declare readOnlyHint, idempotentHint, and destructiveHint. The description adds valuable context beyond those annotations: the paid nature ($0.005 USDC on Base or Solana) and the promise of an exact EIP-712 digest. It does not contradict the annotations, though it omits output format and failure behavior.

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 a single short sentence, so it is concise in length, but the word order is awkward and the payment detail is front-loaded ahead of the core function. It is under-specified rather than efficiently structured.

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?

The tool has four required nested parameters, no parameter descriptions, and no output schema. The description does not explain return format, how the paid aspect works, or how to construct the EIP-712 inputs, so an agent cannot confidently call the tool correctly from this definition alone.

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 0%, so the description must compensate by explaining the parameters. It does not mention domain, types, primaryType, or message beyond the general EIP-712 context, leaving the agent without meaningful parameter guidance.

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 identifies the deliverable as an exact EIP-712 typed-data digest for signing and verification, which is distinct from generic hashing tools like keccak256 or hash_encode. However, it lacks an explicit verb and is somewhat grammatically garbled ('Paid $0.005 USDC on Base or Solana exact EIP-712 typed-data digest...').

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 phrase 'for signing and verification workflows' provides a clear use context, but there is no guidance on when to prefer this tool over sibling hashing utilities or when not to use it. No alternatives or exclusions are mentioned.

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