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

Annotations already declare the full safety profile (readOnlyHint=false, destructiveHint=false, idempotentHint=true, openWorldHint=false), so the description only needs to add operational context. Instead it adds nothing: it does not say what confirming does (does it finalize the asset, queue processing, return a creative id?), what happens on a file_hash mismatch, or what to do on failure.

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?

A single front-loaded sentence with no filler. It is efficient, though the brevity contributes to the missing prerequisites rather than simply reflecting a simple tool.

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?

An output schema means return values need not be described, yet the description leaves the critical lifecycle context unaddressed: where selection_key originates, that a prepare step is required, and what confirmation transitions the upload into. For a mutating, state-transition tool this is a substantial gap.

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% across three parameters. The description only echoes the names of the two required fields and never explains what a selection_key is, where it comes from, whether file_hash must match the prepared upload, or what folder_name controls. It does not compensate for the total schema documentation 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 uses a specific verb ('Confirm') plus a specific resource ('prepared creative upload') and names the two required inputs. It is understandable in isolation, but it does not distinguish this tool from lifecycle siblings like creatives_request_upload or creatives_abandon_upload, so an agent must infer the correct stage.

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 word 'prepared' hints at a prior step but the description never states the prerequisite (that an upload must first be initiated via creatives_request_upload) or when to use creatives_abandon_upload instead. No when-to-use or when-not-to-use guidance is given.

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