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

Annotations already cover idempotentHint=true and destructiveHint=false, so the description does not need to repeat those. It adds meaningful behavioral facts beyond the annotations: requires x402 payment, costs $0.25 in USDC on Base or Arbitrum One, and uses POST to a specific endpoint. It does not describe failure modes or what exactly is stored, but the payment and side-effect implications are clearly disclosed.

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 short and front-loaded with the core idea, then gives payment and endpoint details. The all-caps 'MONETIZED VIA x402' is slightly noisy, but each sentence carries useful information and there is little wasted text.

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 paid mutation tool with three parameters and an output schema, the description leaves important gaps: it does not clarify the meaning of url, the purpose of idempotency_key, or the shape of the proof/report being returned. Payment mechanics are covered, but an agent still cannot confidently construct a correct call without more parameter context.

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 only 33%: only agent_wallet has a description, while url and idempotency_key do not. The description does not explain what url should contain, what idempotency_key is for, or how the x402 payment maps to parameters. With low schema coverage, the description needed to compensate and did not.

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 says 'Agents pay for work and prove what happened' and gives the POST endpoint, so an agent can infer that this tool is about paying for and reporting/proving work. However, it never states a clear verb+resource such as 'creates a trust report' or 'submits proof of work,' and it does not distinguish this from the sibling verified_check.

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 description gives useful context: this is a paid tool, costs $0.25, and is monetized via x402, so agents should only call it when payment is possible. It does not mention when to use this tool versus alternatives like verified_check or compute_history, and it gives no when-not-to-use guidance.

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