format_excel_cells

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

With no annotations provided, the description effectively covers behavioral traits: it specifies that formatting is selective (only changed attributes), and mentions the return value is a confirmation with cell count. It does not contradict any annotations.

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 well-structured with a brief introductory sentence, a usage example, and a clear @param listing for all 15 parameters. While slightly long, it earns its length given the tool's complexity, with no wasted sentences.

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 15 parameters and no existing annotations or output schema shown, the description covers all essential aspects: file path, cell range, formatting options, and return value (confirmation with cell count). It is complete for effective tool usage.

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?

Although schema description coverage is 0%, the description compensates by documenting each parameter with type, example values, and allowed options (e.g., 'thin, medium, thick, double, dashed, or dotted' for border_style). This adds significant meaning 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 'Apply formatting to a cell range' and lists specific formatting options (font, colors, borders, alignment, number format), making the purpose unambiguous. It distinguishes itself from sibling tools like update_excel_cells (which updates values) and set_excel_column_widths.

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 explains that only passed attributes are changed and existing styling is preserved, providing clear usage context. It includes an example of styling a header row. While it doesn't explicitly state when not to use, the sibling list implies alternatives for other operations.

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