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

With no annotations, the description carries the full burden. It discloses the cost ($0.005 via x402) and the public-only constraint. However, it does not mention error handling, rate limits, or behavior for dynamic/large pages, leaving gaps in transparency.

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 extremely concise: one sentence plus a brief cost note. All information is front-loaded, and there is no redundant verbiage.

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?

While the description states the output is 'structured JSON', it does not detail the expected fields (e.g., title, text, metadata). Given the lack of an output schema, this omission may hinder an agent's ability to use the tool effectively. However, the tool is simple with only one parameter, so it is somewhat adequate.

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% (the single parameter 'url' has a description). The tool description adds no additional meaning beyond the schema's 'Public webpage URL'. Baseline score 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?

The description uses a specific verb ('Extract') and resource ('public webpage') and clearly states the output format ('structured JSON'). It distinguishes from siblings like 'page_meta' (metadata only) and 'summarize_url' (summarization) by including both text and metadata extraction.

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?

The description mentions the cost and the public nature of the webpage, but provides no explicit guidance on when to use this tool versus alternatives (e.g., 'summarize_url', 'page_meta'). No exclusions or when-not-to-use are stated.

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