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

With no annotations, the description carries the full burden and does so: it discloses server-side fetching, the scoring methodology (20 weighted checks), the return shape, the $1.00 USDC-on-Base x402 payment flow funded from the owner's approved wallet, and that no API key is required. Cost and auth mechanics are exactly the traits an agent needs before invoking.

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?

Purpose is front-loaded in the first sentence, followed by capability detail, cost, and usage. The enumerated check categories are dense but each carries signal for a scoring tool; the only mild bloat is the length of the category list, which is still informative rather than redundant.

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?

Despite no output schema, the description specifies the return payload (0-100 score, A-F grade, per-check pass/partial/fail/unknown with evidence, top 3 fixes), plus the payment precondition. Nothing an agent needs to call this correctly or interpret results is missing.

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?

Only one parameter with 100% schema description coverage, so the schema already documents 'url' fully. The description adds that the store is fetched server-side, which slightly clarifies handling, but contributes no format or validation detail beyond the schema. Baseline 3 is appropriate.

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+resource ('Audit an ecommerce storefront for AI-agent shopping readiness') and enumerates the exact check categories performed. No sibling exists, and the agent can tell precisely what the tool produces without opening anything else.

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?

Closes with explicit when-to-use framing: deciding whether a store is ready for AI shopping agents, or generating the audit behind a merchant readiness report. There are no alternative tools to route against, so no exclusions are needed, but the guidance is clear and actionable.

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