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

Annotations indicate this is neither read-only nor destructive, and the description confirms some mutating behavior, but it does not explain what 'confirm' actually does, whether it is idempotent, or what side effects may occur.

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 one concise, direct sentence with no redundant wording. It is well-structured and easy to parse.

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?

The description lacks important workflow context such as what the response contains, what errors might occur, or what state the upload must be in. While an output schema may exist, the description alone does not give enough surrounding context for reliable use.

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?

The input schema provides no descriptions, so the description must compensate. It explains that selection_key and file_hash are used to identify and confirm the upload, but it does not clarify the role of folder_name or the expected format/relationship of the 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 clearly identifies the action ('Confirm'), the resource ('a prepared creative upload'), and the key identifiers used ('selection key' and 'file hash'). It also naturally distinguishes this tool from related sibling operations like creatives_request_upload and creatives_abandon_upload.

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 implies this should be used only after an upload has been prepared, but it does not explicitly state when to use this tool versus alternatives, nor does it mention prerequisites or sequencing relative to related tools.

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