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

Annotations only declare readOnlyHint and openWorldHint, so the description's payment disclosure is genuinely additive: the exact price ($0.002 USDC), the x402 flow, the unauthenticated failure mode, and the three retry mechanisms (X-PAYMENT header, PAYMENT-SIGNATURE header, params._meta["x402/payment"]). It stops short of describing result shape or pagination behavior.

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?

Front-loaded with purpose, then scope caveat, then cost and payment mechanics – a sensible order with no filler. The payment sentence is dense (three alternate retry paths) but every clause carries operational information an agent needs.

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 output schema, the description still signals that returned fields are labelled in Chinese and that results cover recalls, products, and hazards. Payment failure and recovery are fully covered; the only real gap is the response shape and whether results are paginated, which is minor for a 2-parameter lookup.

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%, so 'query' and 'limit' (including the 1-50 bound and bilingual labels) are already fully documented in the schema. The description adds only the indirect note that output uses Chinese field labels, not additional meaning for either parameter.

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?

States a specific verb and resource ('Search official CPSC product recalls, products and hazards') plus a domain ('cross-border sourcing'), which lets an agent separate it from generic search tools. It does not, however, explicitly distinguish itself from nearby siblings such as us_fda_recalls, vehicle_recalls, or product_compliance_checklist.

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?

There is a clear positive-usage hint ('for cross-border sourcing') and one negative boundary ('Not certification or safety clearance'), which is useful. But it never names an alternative tool or states when another recall/compliance sibling should be preferred, so routing between similar tools is left to inference.

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