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

With no annotations, the description usefully discloses that the tool is paid, uses x402 on eip155:8453, and returns a short JSON with risk, advice, red_flags, and reasons. It does not cover payment failure behavior, rate limits, or how to interpret the score, so it stops short of fully carrying the behavioral burden.

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/protocol context before the core purpose and return shape. Every clause contributes useful information without repetition.

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 one-parameter tool with no output schema or annotations, the description covers cost, protocol, scoring dimensions, and returned fields well. It could be stronger on score interpretation and payment/error behavior, but it is largely sufficient.

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 coverage is 100% for the single domain parameter, and the schema already explains that any URL on the store domain is accepted. The description adds no parameter semantics beyond restating 'domain or URL', so the baseline 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?

The description states a specific resource and output: a 0-100 trust score for an online store domain or URL. It also names the evidence dimensions behind the score, so the agent can distinguish this from generic site audits or vendor reports.

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 phrase 'for an online store domain or URL' implies when the tool is appropriate, but it gives no explicit when-not-to-use guidance or alternatives. Sibling tools such as trust_trio, vendor_due_diligence, and pre_purchase_check make routing ambiguity likely.

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