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

No annotations are provided, so the description carries the full disclosure burden, and it discloses almost nothing. 'Search' implies a read, but there is no statement about whether results are live directory data, whether the call is metered/paid (notable given the x402 payment context), pagination, or result limits.

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?

It is short and front-loaded, so there is little wasted text, but it is under-specified rather than concise and repeats the word 'search' twice in one sentence without adding information.

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 tool with three undocumented parameters, no annotations, no output schema, and dozens of overlapping search siblings, the description supplies none of the context needed to invoke it correctly.

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?

Three string parameters (q, query, search) share 0% schema description coverage, and the description adds no meaning whatsoever. The near-synonymous names actively create ambiguity about which to use and whether they are aliases, which the description does nothing to resolve.

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 verb (search) and a resource domain (x402 services across directories), so the general intent is inferable. However, 'Cross-directory' is undefined jargon and the description does nothing to distinguish this tool from siblings like service_discovery, x402-find, or x402-web-search, leaving the agent unable to tell which search surface this covers.

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, no prerequisites, and no named alternative. With a sibling list containing service_discovery, x402-web-search, x402-token-search, and x402-find, the absence of routing guidance is a real gap.

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