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

Discloses the paid nature ($0.05 per call), the payment challenge/retry mechanism, and the fact that optional flags slow the operation. It also describes the return format (overall score, worst-first findings, per-check detail). No annotations were provided, so the description carries the full burden and covers key behavioral aspects.

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 somewhat long but well-structured: it opens with the core purpose, lists the coverage areas, explains the return value, and then covers pricing and payment. Some repetition (e.g., 'complete' and 'cheaper') could be trimmed, but it remains clear and logically ordered without being overly verbose.

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 adequately explains the return structure (overall score, worst-first findings, per-check detail). It also covers the payment interaction and optional flags. It does not discuss error handling or rate limits, but those are not essential for basic usage. Overall, it provides enough context for an agent to use the tool effectively.

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?

All 4 parameters are described in the schema (100% coverage). The description adds meaningful context beyond the schema: x_payment is explained in terms of the payment challenge flow, and includeLinks/includeSitemap are noted as slower. This goes beyond the baseline for full schema coverage.

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?

Description clearly states it runs a complete health check on a page, covering SEO, structured data, accessibility, and optional links/sitemap. It distinguishes itself from sibling tools by framing it as the answer to 'is this page any good?' and explicitly names audit_seo, validate_structured_data, and scan_accessibility as separate, more expensive alternatives.

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?

Provides guidance on when to use the tool: when a broad page health assessment is needed rather than a narrow question. It also explains the payment flow (call without x_payment for challenge, then retry) and that includeLinks/includeSitemap are optional but slower. Could be more explicit about when to prefer the narrow sibling tools, but the contrast is clear enough.

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