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

The write-tier approval note adds behavioral context not present in annotations: first-use manager approval behavior, from-now-on vs just-once semantics, and instructions on when not to re-ask. The description does not directly contradict the annotations, though destructiveHint=true is somewhat aggressive for a create operation.

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 front-loaded with a clear one-sentence purpose, followed by a focused approval note. The note is slightly verbose but directly actionable and earns its place.

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 create tool with three documented parameters and no output schema, the description covers what is created, the optional headers behavior, and the approval workflow. It omits return-value details like the resulting spreadsheet ID or URL, which would help chaining, but this is not a critical gap for 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 description coverage is 100%, so all three parameters are already documented. The description only restates that headers are optional and adds little semantic value beyond 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?

The first sentence names a specific verb ('Create'), a resource ('a new Google Spreadsheet), and an optional element ('optional headers'). The word 'new' clearly differentiates this from siblings that update or append to existing sheets, such as update_sheet and append_to_sheet.

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 explicit call-time guidance: call it on the first clear ask and do not re-ask in chat once the approval card is presented. It does not explicitly name alternatives or exclusions relative to sibling tools, so it falls just short of full alternative routing guidance.

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