Capture screenshots of many URLs

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

With no annotations, the description carries the full burden and does well: it discloses the 50-entry ceiling, the defaults/override merge behavior, that the return is a raw API job response, the conditional uuid follow-up, and the paid-plan requirement. Async timing, rate limits, and failure behavior of the job are not described.

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?

Front-loads the operation and the 50-URL cap, then layers in the option vocabulary, merge semantics, return behavior, and the paid-plan caveat. The parenthetical option list earns its space because the schema's additionalProperties does not enumerate valid keys.

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?

No output schema exists, yet the description explains what comes back (the API's job response) and how to act on it (uuid → get_bulk_status → download_bulk_results). Combined with the nested-object merge semantics and plan restriction, an agent has everything needed to invoke and follow up correctly.

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 coverage is 100%, so the baseline is 3, but the description adds real value: it names the raw API option keys (file_type, width, height, full_page, ...) that the generic additionalProperties schema only gestures at, and it states the precedence rule — defaults apply unless an entry overrides them — which the schema does not spell out.

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 — submits up to 50 URLs as one bulk screenshot job over the JSON bulk API — and the 'JSON bulk API' phrasing implicitly separates it from the bulk_screenshots_csv sibling and from the single-URL take_screenshot. An agent can identify the operation and its batch scope without opening the schema.

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?

Gives a clear usage path: submit here, then track with get_bulk_status if a uuid comes back and fetch with download_bulk_results, and it flags the 'Paid plans only' prerequisite. It stops short of stating when to prefer bulk_screenshots_csv or take_screenshot instead, so the routing to the closest sibling is left implicit.

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