excel_format_cell

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

Annotations already declare destructiveHint: true, so the agent knows this is a write operation. The description adds no further behavioral context (e.g., that existing formatting is overwritten, file modification details). With annotations carrying the burden, a 3 is appropriate—the description is adequate but doesn't enhance transparency.

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?

Single sentence, no fluff, front-loaded with core purpose. Could be slightly more structured by separating key aspects, but it's efficient and clear.

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, so the description should at least hint at return values (e.g., success/failure) or side effects. With nested parameters (format object), some guidance on valid sub-properties would improve completeness. Currently minimal, but given the tool's simplicity, it is partially adequate.

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 high (80%), and the schema describes 'format' as generic 'Format options'. The description adds concrete examples ('color, font, borders, alignment'), providing meaningful extra context. However, it does not explain the nested structure or enumerate all possible options, so not a 5.

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?

Description clearly states the tool changes cell formatting and lists examples (color, font, borders, alignment). However, it doesn't fully differentiate from sibling formatting tools like excel_apply_conditional_format or excel_merge_cells, which could be considered formatting as well. The verb 'Change' is specific but the scope is broad.

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 on when to use this tool vs alternatives. With 33 sibling tools including other formatting-related tools, the description should indicate when excel_format_cell is appropriate (e.g., for static visual changes) versus conditional formatting or structural changes. Missing entirely.

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