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

With no annotations, the description carries the full burden and does disclose the most important non-obvious traits: the response includes the signed message and signature, and each call costs $0.003 USDC via x402 on Base — a material fact an agent must know before calling. It stops short of describing what happens on payment failure or unauthenticated invocation, leaving a gap for a paid mutation-adjacent tool.

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 sentences, no filler. The payload content is front-loaded and the payment/billing condition follows as a distinct clause. Every element earns its place.

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?

There is no output schema and no annotations, so the description must convey what comes back — it does, naming the time formats, the signed message and the signature, plus cost and payment rail. Only the exact response field layout and failure behavior are left unspecified, which is a minor gap for a zero-parameter tool.

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?

The tool takes zero parameters, so there is nothing for the description to disambiguate; baseline applies. The description correctly implies a parameterless call.

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 states a specific resource and behavior: it returns the current UTC time (ISO and unix ms) signed by the genexxis notary key. That is concrete enough to distinguish it from most siblings. However, it never mentions the close sibling notary_stamp, so an agent cannot tell from the description alone which of the two notary endpoints it should call for a given signing need.

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 independent verification' implies the use case (obtaining a verifiable timestamp), but there is no explicit when-to-use/when-not-to-use guidance and no mention of notary_stamp as the alternative for signing arbitrary payloads. The usage is inferable but not stated.

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