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

With no annotations provided, the description carries the full burden, and it does an excellent job. It discloses the return fields and their conditions (artifact_ref, download_endpoint, legacy download_url when storage-verified), explicitly states what is never returned (provider URLs and storage identifiers), and describes the 404 behavior as a shape instead of an exception.

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 the core purpose, then logically flows through return behavior, security/redaction details, error handling, and required invocation details. Every sentence adds behavioral or usage value; the REQUIRED and EXAMPLE lines are compact and immediately actionable.

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 this is a single-parameter getter with no output schema, the description is fully complete: it explains returned fields, conditional availability, authentication properties, redaction guarantees, the not_found response shape, and the exact parameter format with an example. Nothing needed to call it correctly is missing.

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 schema provides only the parameter name and a bare title with 0% description coverage. The description compensates fully by stating REQUIRED, the type (str), the format (UUID), and a concrete call example using the exact parameter key, making invocation unambiguous.

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 opens with a specific verb and resource: "Get a single creative owned by the authenticated tenant by creative_id." This clearly distinguishes the tool from siblings like creatives_list (plural) and creatives_delete, and leaves no doubt about what operation is performed.

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?

It provides clear context for when to call the tool: when you have a specific creative_id and need a single creative. It does not explicitly name alternatives or exclusions, so it stops short of a 5, but the single-creative-by-ID framing is strong enough to guide an agent away from list-style siblings.

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