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

No annotations are provided, so the description carries the full burden. It discloses the flat charge, the fact that success is not guaranteed per URL, disabled automatic retries, and the exact endpoint and credential binding for payment challenges.

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 longer than average but every sentence carries meaningful operational information such as pricing, retry policy, endpoint binding, and tool selection. The structure is clear, though some repetition exists between the description and the schema parameter descriptions.

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?

Given the rich schema and output schema presence, the description provides all necessary invocation context: required and optional parameters, constraints, payment expectations, retry behavior, and differentiation from sibling tools. Nothing essential 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?

The schema already covers all parameters with descriptions, and the tool description reinforces the 'unique fields' constraint and the flat-pricing nuance for the urls parameter. It adds helpful meaning beyond the raw schema without being redundant.

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?

Clearly states the tool fetches one to five public HTTPS URLs and returns bounded structured fields in one paid attempt. It also distinguishes itself from the sibling tool 'extract' by explicitly noting batch accounting, so an agent can tell them apart.

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?

Explicitly instructs when to use this tool versus the 'extract' sibling, and clarifies the payment model, retry behavior, and per-request constraints. This gives the agent actionable guidance on when this tool is appropriate.

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