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

Beyond the annotations (which already indicate a non-read-only operation), it discloses the optional fill behavior, the row-array layout including header treatment, the returned spreadsheet id + URL, and the Drive connector requirement. No contradiction with 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?

Four tight sentences that front-load the core behavior, then add only the needed formatting, return, and connection details. No filler or repetition.

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?

For a simple 2-parameter tool with no output schema, the description covers return value, row format, and auth prerequisite. It is slightly incomplete only in not naming the sibling tools for appending/updating an existing sheet.

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% and both rows and title are already described in the schema; the description mostly restates 'array of row arrays, first row = headers' in natural language. It adds little information that an agent couldn't already derive from 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?

States a specific action ('Create'), an exact resource ('new Google Spreadsheet in the user's Drive'), and gives concrete example payloads ('swipefile, ad list, performance report'). Saying 'new' plus 'Spreadsheet' separates it from create_doc and from update/append sheet tools.

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?

Gives clear contexts for use: creating a fresh spreadsheet and optionally exporting row data, and a concrete prerequisite ('Needs Google Drive connected'). It doesn't explicitly say when to prefer append_to_sheet or update_sheet instead, so it misses the explicit exclusions needed for a 5.

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