grid_combine

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

No annotations are present, so the description must carry the full burden of behavioral disclosure. It only states the basic action and says nothing about output behavior, file handling, page distribution for varying page counts, or any side effects. The agent is left uninformed about important operational details.

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 clear sentence that immediately states the purpose. It is concise, front-loaded, and free of unnecessary filler, effectively communicating the tool's essence in minimal space.

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 tool's moderate complexity, the lack of annotations, and the absence of an output schema, the description is too sparse. It omits critical context such as default grid behavior, handling of uneven PDF page counts, output file naming specifics, and how this tool differs from similar ones. The agent cannot fully understand the tool's behavior without additional information.

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 parameter descriptions already define files, cols, and output_name. The tool description adds no additional meaning beyond the schema's details, so the baseline score of 3 is appropriate.

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 core function: combining multiple PDFs into a grid layout on single pages. It uses a specific verb and resource, and the concept of a grid is distinct from simple merging, though it does not explicitly differentiate from similar sibling tools like nup_pdf or combine_single_page.

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?

No guidance is provided on when to use this tool versus alternatives. With several overlapping sibling tools (e.g., nup_pdf, combine_single_page, merge), the description offers no context for selection, leaving the agent without decision criteria.

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