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

With no annotations, the description carries the full behavioral burden, and it does disclose a genuinely important trait not derivable from schema: a $39 USD fee deducted from the agent balance, plus multi-page crawling scope. However, it omits runtime/duration, whether the fee is charged on failure, and any rate or permission constraints.

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 compact sentence with no filler, and the scope plus cost are front-loaded where an agent will see them. The parenthetical fee clause is dense but earns its place.

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 paid, no-output-schema tool with no annotations, the description says what triggers the run and what it costs but not what the 'audit report' returns, how it is delivered, or how long it takes. That leaves meaningful gaps for an agent deciding whether to invoke it.

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?

There is a single 'domain' parameter with 100% schema description coverage, so the schema already documents it fully. The description adds nothing about accepted formats or URL-vs-domain handling, matching the baseline 3 for high-coverage schemas.

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 ('Executes a deep, multi-page 30+ check technical SEO audit') with clear scope (multi-page, 30+ checks). The 'deep' framing implicitly separates it from the sibling run_quick_seo_checkup, but it never names that alternative, so differentiation is left to inference.

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: 'deep, multi-page 30+ check' suggests this is the heavyweight option versus run_quick_seo_checkup, but there is no explicit when-to-use, when-not-to-use, or prerequisite statement. An agent must guess at the tradeoff.

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