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

With no annotations, the description carries the disclosure burden. It explains the creation behavior, default placement, the condition requiring parentFolderId, and the return value (id and link). It doesn't discuss permission needs or side effects on existing files, but for a create operation the key behavior is well covered.

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?

Three tight sentences with no fluff. The main action leads, followed by the return value and then the placement nuance. Every sentence contributes operational information an agent needs.

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 no output schema, the description usefully states the return value and the key location rule. It doesn't clarify what happens to the default sheet when sheetTitles are provided, or any permission prerequisites, but it gives enough for correct basic 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?

Schema coverage is 75%, and the description adds meaning beyond it: the 'top level unless parentFolderId' default location behavior and the fact that sheetTitles create named tabs. It also frames parentFolderId as a placement control, reinforcing the schema's restriction note.

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 names a specific action and resource: creating a new spreadsheet in the user's Drive, with optional tabs. It also states the output (id and link) and the default location, which clearly distinguishes it from siblings like create_excel_workbook or create_gdrive_folder.

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 gives clear usage context: the new file lands at the Drive top level unless parentFolderId is provided, and explains when parentFolderId is required. It doesn't explicitly compare against alternative spreadsheet creation tools, but the Drive/mailbox framing implies the Google Sheets context.

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