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

With no annotations, the description carries the burden and does well: it discloses the $0.001 USDC x402 payment on eip155:8453, the cryptographic verification steps performed, and the shape of the result. The one notable gap is failure behavior — it does not say whether an invalid signer produces an error, a false verdict, or a distinct status.

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?

It is a single dense sentence with the cost/payment metadata front-loaded and the core purpose immediately after. Nothing is redundant, though the bracketed payment prefix competes slightly with the purpose statement for the agent's first attention.

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 one-parameter tool with no output schema, the description covers cost, verification logic, and return fields (verdict, score, jobId, bytes32 reason), which is nearly everything an agent needs. Only the failure/error path is left unspecified.

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?

There is a single required parameter with 100% schema coverage, and the schema already says 'attestation.token from evaluate_deliverable'. The description restates that origin without adding format, encoding, or provenance details, 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 — verifies an attestation token — and then spells out the mechanism (EIP-712 signer recovery, evaluator check) plus the returned fields. It is unmistakably distinct from siblings like verify_usdc_payment or x402_probe, since it names the issuing tool evaluate_deliverable as the token source.

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 'token from evaluate_deliverable' establishes the clear precondition and workflow position: call this after evaluation to confirm authenticity. There is no explicit when-not guidance or named alternative for related verification tasks, so it falls short of a 5.

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