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

With no annotations supplied, the description carries the full burden and does disclose two genuinely behavioral facts: an auth/configuration requirement and a billing/quota model tied to a signed wallet. It stops short of describing result format, result limits, rate-limit behavior, or what happens when the free trial is exhausted.

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?

Three short statements, front-loaded with what the tool does, then the prerequisite and the cost notice. No filler; the only weakness is that brevity comes at the cost of the missing parameter guidance.

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 zero schema description coverage, no annotations, and no output schema, the description leaves too much unstated: parameter meaning, result count behavior, and response shape are all unspecified. Given the ambiguity between 'q' and 'query', completeness is a real gap rather than a minor one.

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 description coverage is 0% and the description says nothing about the three parameters. This matters here because 'q' and 'query' appear redundant and 'max' is typed as a string, so the description should clarify which query field to use and how 'max' is interpreted, and it does not.

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 verb and resource ('Web Search') and identifies the underlying provider (Brave Search API), so the agent knows what it does. It does not differentiate from close siblings such as x402-web-search-deep, x402-web-scrape, x402-web-retrieve or x402-search, which keeps it from a 5.

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?

It states a prerequisite (BRAVE_SEARCH_KEY must be configured) and a cost model (5 free trial calls per signed wallet), which is useful context. However there is no guidance on when to prefer this over x402-web-search-deep or the other search/scrape siblings, and no exclusions or fallback advice.

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