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

With no annotations provided, the description carries the full burden and it does well: it discloses read-only behavior ('Return a page'), the dependence on a previous result_id, and points to the pagination block for navigating further. It does not discuss potential result expiry or invalid page_num behavior, but the core behavioral contract is clear.

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 compact and front-loaded: one sentence states the function and usage, followed by a brief pointer to pagination details, then a clean argument list. Every line earns its place with no vague or redundant wording.

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?

For a simple three-parameter paging tool with an output schema available, the description is complete. It explains how to identify the result, how to page, and where to find pagination metadata. No critical calling information appears to be 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?

Schema coverage is 0%, so the description must compensate, and it does for all three parameters. dsid is given a format ('dNNNNNN') with an example, result_id is tied to the previous response, and page_num is defined as the page to retrieve. It could add constraints like 1-based indexing or upper bounds, but the essential semantics are present.

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 states a specific verb ('Return a page of results') and a precise resource ('from a previous get_filesearch_*_files call, by its result_id'). This clearly distinguishes the tool from the sibling get_filesearch_*_files tools, which perform the search itself.

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 explicitly tells the agent to use this tool for paging through file-search results beyond the first page and references the pagination block for num_pages and next_page. It implies the prerequisite of an earlier get_filesearch_*_files call, but does not explicitly name an alternative to avoid.

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