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 return shape ('in 3 days') and the past-date fallback ('now'), plus the payment model (5 free trial calls per signed wallet). However it says nothing about accepted date formats, timezone handling, error behavior, or what happens with malformed input.

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?

One compact sentence that front-loads the behavior, followed by a short pricing note. No padding, though the emoji pricing blurb is mild noise for a tool-selection context.

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?

No output schema and no annotations, and two undocumented parameters whose roles are unresolved. The description covers what comes back but not how to invoke it, which is a material gap for a zero-coverage schema.

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 coverage is 0% for two parameters, so the description must compensate, and it does not. It never explains the difference between 'date' and 'value' or which one is actually consumed, leaving an agent unable to tell how to populate the 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?

States a specific verb and resource: renders a future date as a relative phrase, with a concrete output example ('in 3 days') and the past-date case ('now'). It is clearly distinguishable from siblings like x402-time-ago or x402-days-until, though it never names an alternative explicitly.

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?

There is no when-to-use guidance and no comparison to alternatives such as x402-time-ago (past) or x402-relative-time. The only extra sentence is a pricing/trial note, which is not usage guidance.

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