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

The annotations mark this as readOnly=false and non-idempotent, which is confusing for a pure extraction; the description resolves that by disclosing that it is a paid call (0.02 USDC on Base via x402) whose payment executes only after buyer approval. It still doesn't say what 'structured text' looks like, whether auth-restricted pages fail, or how truncation behaves.

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?

Two tight sentences, front-loaded with the action and the cost term. Nothing is wasted.

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, a 0%-documented three-parameter schema, and an identical-sounding sibling, the description leaves too much unstated: what the result contains, how maxChars and includeLinks affect it, and why an agent would pick this over via_extract_web_lite.

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 0% across three parameters, so the description carries the full burden, yet it never mentions url, maxChars, or includeLinks. Only 'public web page or PDF' implicitly hints that the URL must be publicly reachable.

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: extract structured text from a public web page or PDF. However, it gives no cues to distinguish it from the sibling via_extract_web_lite, which sounds like the same job, so an agent cannot tell them apart from the description alone.

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 no when-to-use guidance and no named alternative; the obvious competitor via_extract_web_lite is never mentioned. The only contextual information is the price, which tells the agent what a call costs but not when to choose this tool over its siblings.

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