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

With no annotations, the description carries the full disclosure burden and does well: it states the $0.01 cost, USDC on Base, x402 payment parameter, HTTP method/URL, batch limit, and worst-first ordering. It does not describe error behavior, failure modes, or what happens without payment.

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 compact and front-loads the paid /verdict mode, payment details, and endpoint URL. The opening market-intelligence sentence and free-endpoint list add useful context but are not strictly about invoking this specific tool.

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?

Given no annotations and no output schema, the description supplies the critical missing context: cost, payment mechanism, chain, HTTP endpoint, single vs. batch behavior, batch maximum, ordering, and output dimensions such as live diagnosis, demand, price percentile, and alternatives.

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 100%, and the schema already documents all three parameters, including url as an alias, resource for single mode, and resources for batch mode with the 25-item limit. The description reinforces the single-vs-batch distinction but adds little semantic detail beyond the schema, so the high-coverage baseline of 3 applies.

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?

It states a specific verb and resource: 'vet one endpoint' or batch-vet up to 25 x402 endpoint URLs via the paid /verdict endpoint. It distinguishes single vs. batch mode, but it does not explicitly differentiate this tool from sibling vetting tools such as x402check__check or x402_preflight__check.

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?

The description gives clear usage context: this is the paid /verdict tool, with single-resource and batch modes, and it names the batch cap of 25. It does not provide explicit when-not-to-use guidance or a direct comparison to sibling alternatives.

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