Validate against the account platform, then upload the item as a creative (Action)

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

Beyond the annotations (readOnlyHint=false, openWorldHint=true), the description discloses genuinely useful behavior: the operation is a real write that only fires with confirm:true, there is no server-side dry run, and omitting confirm returns a request preview rather than executing. What is not covered is failure semantics - whether a validation failure aborts before any upload, and whether a partial publish is possible.

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?

Two sentences, front-loaded with the action and its gate, with the endpoint appended. The parenthetical '(Action)' and the restated title add little, but nothing is padded or buried.

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 nested-body mutation with no output schema, the definition covers the confirm gate and the preview return but omits what a successful publish returns, permission requirements, and what happens when platform validation fails. Adequate to call safely, but not complete.

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 coverage is 50%: confirm and idempotencyKey are documented in the schema, while id and body.adAccountId are not. The description explains the confirm gate and the absence of a dry run (which motivates confirm), but says nothing about what id refers to (a creative library item id) or what adAccountId governs for this call, so it only partly compensates for the coverage gap.

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 names a specific two-step action (validate against the account platform, then upload as a creative) and pins it to POST /v1/creative-library/{id}/publish, so the agent knows exactly what resource is being acted on. It is weakened slightly by reuse of the verbs 'validate' and 'upload', which are also dedicated sibling tools (creativeLibrary_validate, creativeLibrary_upload), without saying how this differs from calling them separately.

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?

Usage is implied: this is the step that turns a library item into a live creative on an ad account. However, it never states when an agent should prefer creativeLibrary_validate or creativeLibrary_upload instead, nor any prerequisite such as the item already being uploaded or the account being connected.

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