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

With no annotations, the description carries the disclosure burden. It does add a genuine behavioral trait: '5 free trial calls per registered wallet' implies an auth/wallet requirement and a rate limit beyond the trial. But it says nothing about side effects, external calls, failure behavior, or whether the operation mutates anything.

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 a single front-loaded sentence with zero wasted words; the purpose comes first and the trial-call note is a compact add-on. It is appropriately small, though the brevity reflects under-specification rather than rich but efficient writing.

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 annotations, no output schema, and three ambiguous string parameters. The description leaves unstated what the search returns, whether the parameters are interchangeable, and how results are presented — gaps that nothing else in the structured data fills.

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?

Although schema coverage is technically 100%, each parameter description is a tautology ('Q to process', 'Query to process', 'Search to process') that conveys no meaning about content, format, or selection. The tool description adds nothing to disambiguate the three redundant-looking string parameters or indicate whether they are aliases.

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 names a specific resource ('x402 service') and scope ('cross-directory'), which hints at differentiation from web-search siblings like x402-web-search. However, it largely restates the tool name and never clarifies what 'service' means, what directory structure is being searched, or what a result looks like.

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?

No when-to-use guidance, no named alternatives, and no exclusions. With thousands of sibling tools including x402-web-search, x402-token-search, service_discovery, and get_stats, an agent has no basis for choosing this tool over them. The free-trial note is pricing context, not usage direction.

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