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

The description does not disclose side effects, such as whether a pending upload session is created, how long metadata remains valid, or whether subsequent confirmation is required. Annotations are sparse (readOnlyHint false, destructiveHint false) and provide little additional transparency.

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 a single concise sentence with no fluff, but it is vague ('bounded upload metadata') and does not add structural information. It is not poorly organized, but it omits useful details.

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?

With seven parameters and no parameter descriptions, the description is not complete enough for correct use. Although an output schema exists, the description does not explain the upload workflow, prerequisites, or how the returned metadata fits with sibling confirm/abandon tools.

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 0% and the description explains none of the seven parameters. It does not clarify file_hash algorithm, file_size units, content_type format, or the purpose of upload_attempt and idempotency_key.

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 states a specific action ('Prepare a creative upload') and resource ('creative upload'), and indicates an output ('return bounded upload metadata'). It distinguishes this from sibling tools like creatives_confirm_upload and creatives_abandon_upload, though it does not explicitly name them.

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 no explicit guidance on when to use this tool versus alternatives such as creatives_confirm_upload or creatives_abandon_upload. It implies preparation but does not state the workflow or when not to use it.

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