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

With no annotations, the description must cover behavioral traits. It discloses the cost ($0.10 USDC), payment mechanism, and the shape of the return value. However, it does not explain what happens to the payload (e.g., if it is stored, deleted, or if any side effects occur), and the 'Body: { payload }' line introduces ambiguity regarding the actual request structure.

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 extremely concise: two sentences plus a body note. It front-loads the purpose and cost, then lists the return fields. Every word earns its place, and there is no padding.

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 simple tool with one parameter and no output schema, the description covers the essential context: pricing, required payment, return values, and the payload requirement. However, the ambiguity around the body vs. the x_payment parameter prevents a perfect score. Overall, it is complete enough for an agent to attempt the call, but with some risk of misinterpreting the request format.

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?

While the schema provides 100% coverage for the single parameter x_payment, the description adds confusing extra info with 'Body: { payload }' which seems to contradict the schema that only lists x_payment. This does not clarify the parameter semantics and may mislead an agent about how to structure the request.

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 clearly states the action (timestamp and SHA-256 a JSON payload) and the resource (a paid notary service on Base). It distinguishes itself from sibling tools by being the only one performing this specific function, and it includes payment details.

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 implies usage (pay and submit payload) but provides no explicit guidance on when to use this tool versus alternatives. It does mention 'No account, no API key' which lowers the barrier, but there is no direct comparison or exclusion of other tools.

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