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

Even though readOnlyHint=false already signals a write operation, the description adds valuable behavioral detail: the tool writes only and cannot read, list, or search existing Drive itemsikuha. It also highlights the account-connection requirement NH the folder-creation side effect described in the folder_name parameter. This adds context beyond the 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 core description is three focused sentences: purpose, usage trigger, and write-only scope. It is front-loaded and free of redundancy, aside from the trivial trailing '[category: utility]' tag. This is concise without losing key operational constraints.

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 uploader with one required parameter, the combination of description and schema covers the full call contract: what it does, when to use it, authentication need, write-only nature, and parameter semantics. The only absence is a return-value description, but a simple upload operation does not need one, especially without an output schema.

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 the plain description does not need to explain the parameters. The description does not add anything about the file, filename, or folder_name beyond what the input schema already specifies. Per the rubric, baseline 3 is appropriate when the schema fully documents parameters.

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 says exactly what the tool does: 'Save a finished file into the signed-in user's own Google Drive.' It also explicitly scopes the tool as write-only ('Only ever writes: it cannot read, list or search anything already in their Drive'), which clearly distinguishes it from read/search siblings and storage 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?

The description gives an explicit usage scenario: 'Use as the last step of a workflow when the user asks for the result to be put in, saved to, or uploaded to their Drive.' It also states a clear prerequisite: 'Needs their Google account to be connected on the Integrations page.' However, it does not name alternative tools or give a when-not-to-use statement, so it is not fully explicit about exclusions.

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