sheets_update_values

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

With no annotations provided, the description carries the full burden. It explains behavioral traits: fixed range requires exact row count, flexible range auto-expands, and empty rows are counted. It could mention that the operation overwrites existing data and potential authorization needs, but overall it is fairly transparent.

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 concise and well-structured, front-loading the main action and using bullet-like examples. Every sentence adds value without redundancy, making it easy for an AI agent to parse quickly.

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 4 parameters (3 required, 1 enum) and no output schema, the description is fairly complete. It explains range behavior and a critical caveat about empty rows. It lacks details on return values or error handling, but the absence of output schema lessens the need; overall 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 description coverage is 100%, so baseline is 3. The description adds significant value beyond the schema by providing examples and tips for the range parameter (e.g., using 'A42' instead of 'A42:E53') and clarifying the empty row behavior, enhancing usability.

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 tool updates values in a specified range of a Google Sheets spreadsheet, using a specific verb and resource. It distinguishes from siblings like `sheets_append_values` or `sheets_clear_values` by focusing on overwriting existing data within a range.

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 provides practical examples and an important note about empty rows, offering implicit guidance on when to use fixed vs flexible ranges. However, it does not explicitly contrast with alternatives like append or clear, leaving some usage context unaddressed.

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