excel_update_cell

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

The annotation destructiveHint: true already indicates modification, but the description adds no extra behavioral details. It does not mention that the existing value is overwritten, what happens to formulas, or any effect of the createBackup parameter. The description adds minimal value beyond 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 a single sentence, highly concise and front-loaded with the core action. Every word is necessary and there is no redundant text.

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 presence of multiple sibling tools and the lack of an output schema, the description is too sparse. It does not explain return behavior, side effects (e.g., overwriting existing content), or the significance of the createBackup parameter. A more complete description would include such details to aid agent selection and invocation.

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?

The input schema covers 80% of parameters with descriptions, so the baseline is 3. The tool description adds no additional information beyond what the schema provides for parameters like filePath, sheetName, and cellAddress. The 'value' parameter's schema description is generic ('Value to write'), and the description does not clarify type or format.

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 verb 'Update value of a specific cell', which precisely indicates the action on a single cell. It distinguishes well from sibling tools like excel_write_range (multiple cells) and excel_set_formula (formula instead of value).

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 such as excel_write_range or excel_set_formula. The description lacks explicit context for when this tool is appropriate or when other tools would be better.

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