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

The annotations already declare readOnlyHint=true, lowering the burden on the description. The description adds valuable behavioral context by specifying the returned fields (price, schemas, networks, verification) and the verified-first sort behavior. It does not contradict the annotations, though it omits details like pagination or open-world result semantics.

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 four sentences with no filler: purpose, return payload, sort guidance, and usage trigger each occupy one sentence. It is front-loaded and every clause adds 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 read-only search tool with no output schema, the description covers the primary use case and return behavior well. However, with five parameters and zero schema-level documentation, the missing explanations for max_usd, network, and limit leave notable gaps for an agent trying 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?

With schema description coverage at 0%, the description must compensate for parameter meaning. It hints at query through 'by task description' and at sort through 'Sort by verified', but leaves limit, max_usd, and network unexplained, including their format constraints.

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 verb ('Search') with a concrete resource ('paid agent capabilities') and a clear search criterion ('by task description'). It also lists what is returned and the scenario where it should be used, making its purpose unambiguous and distinguishable from siblings like get_capability.

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?

Provides an explicit trigger: 'Use before paying an x402 endpoint you have not used.' However, it does not name alternatives or state when not to use it, so it stops short of a perfect 5.

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