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

With no annotations, the description carries the full burden; it does add useful context: a fixed price of $0.02 USDC on Base and that results are instant. However, it does not explain whether payment is required up front, how the x402 flow works, or what triggers the optional paymentSignature, leaving key behavior undisclosed.

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?

A single front-loaded sentence with no wasted words; pricing is appended where it belongs, at the end.

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 simple two-parameter audit tool with no output schema, the description conveys the output shape (0-100 score plus prioritized fixes), latency, and cost. The only missing piece is the mechanics of the payment requirement.

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%, so both url and paymentSignature are already documented. The description adds no constraints or format hints for either parameter, so the 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?

States a specific verb and resource: an instant 0-100 Technical SEO & Website Modernization Audit scorecard with prioritized fixes. The resource domain (website SEO) is clearly distinguishable from sibling tools like audit_crypto_token or calculate_prop_firm_risk.

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?

Usage is only implied: an agent can infer this is the tool for auditing a website's technical SEO. There is no explicit when-to-use/when-not guidance, no prerequisites (e.g., payment setup), and no alternatives are named.

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