extract

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

With no annotations, the description must carry the behavioral burden. It does disclose the two operating modes (structured JSON versus text answer), which is meaningful. However, it does not mention rendering defaults, page-fetch behavior, rate limits, or side effects. The render parameter is defined in the schema, so some of that context is available, but the description itself stays minimal.

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 a single, front-loaded sentence with no wasted words. It could be slightly better structured by explicitly separating the two modes, but as written it is efficient and easy to parse.

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?

The output schema exists, so return-value details are covered elsewhere, and the input schema is fully documented. The main gaps are the lack of choice guidance between prompt and json_schema, and no indication of when to use extract instead of scrape. These gaps make the description adequate but not complete.

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%, so the schema already defines url, prompt, render, and json_schema. The description adds a high-level mapping by linking json_schema to structured JSON and implying the text answer comes from the prompt, but it does not add much beyond the schema.

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 clearly states the action ('extract'), the target resource ('a page'), and the two possible outputs: JSON matching json_schema or a text answer. It does not explicitly distinguish itself from sibling tools like scrape or search, though the verb and output specification make the core purpose clear.

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 gives no guidance on when to use extract versus scrape, search, or deep_research, and no exclusions or conditions. The only context is 'from a page,' which is too thin to help an agent choose between this and its siblings.

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