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

No annotations exist, so the description carries the full behavioral burden, and it discloses almost nothing: no return shape, no ranking behavior, no rate limits or auth needs. Only the vague hint that the search spans multiple directories is added.

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?

A single short, front-loaded sentence with no waste. It is well-sized; the problem is under-specification rather than verbosity.

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?

With no annotations, no output schema, and three ambiguous parameters, the description is far too thin. It never explains what a directory is, what kind of services are returned, or how the three query parameters interact.

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 near-identical parameters (q, query, search) exist and the description does nothing to explain whether they are aliases or distinct filters. Although schema description coverage is nominally 100%, the schema texts are placeholders ('Q to process'), so the schema is not doing meaningful lifting and the description fails to compensate.

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 verb (search) and a scope (cross-directory x402 service search), which is more than a tautology. However, it does not distinguish this tool from the many other search-like siblings (x402-web-search, x402-token-search, x402-twitter-search, x402-find), and 'cross-directory' is left unexplained.

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 guidance on when to use this over the numerous sibling search tools, no prerequisites, and no exclusions. The phrase 'Cross-directory' hints at scope but the agent gets no routing rule.

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