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

With no annotations, the description must carry the behavioral load. It usefully discloses the verification method (EIP-712 signature checked against the published public key) and that the operation is free, but says nothing about what a failed verification yields, whether it errors or returns a negative result, or any side effects.

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?

Two short sentences with no filler; the core action leads and the pricing note trails. Nothing could be cut without losing information.

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 single-parameter verification tool with no output schema and no annotations, the description omits the most important remaining detail: what the result looks like (boolean, recovered signer, error on failure). Otherwise it is adequate.

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?

Only one parameter and the schema description coverage is 100%, so the schema already documents 'attestation' as a stringified JSON object. The description adds no format, encoding, or validity details beyond that, which is the expected baseline when the schema does the 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 (verify) and resource (EIP-712 attestation) plus the trust anchor (published public key), so the agent knows exactly what the call does. It does not name or contrast any sibling, but the siblings (canonicalize, create_receipt, structure_extraction) are unrelated enough that confusion is unlikely.

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?

'Always free' is pricing information, not usage guidance; it does tell the agent cost is never a reason to avoid the call, but there is no statement of when to use this versus alternatives or any prerequisites (e.g. needing a published key to exist).

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