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

Annotations already declare readOnlyHint=false and destructiveHint=false, so the description's only real addition is the word 'Confirm'. It omits the key behavioral facts for a confirmation step: that it commits a draft, whether it is idempotent, what happens if the draft expired, and whether the action is reversible.

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 arguably too terse for a mutation step — brevity here comes at the cost of missing workflow context rather than being a virtue.

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 state-changing confirm tool with no output schema and incomplete parameter documentation, the description leaves out the prepare/confirm workflow, preconditions, and the effect of confirming. An agent could not reliably use this without inferring the whole two-step pattern from sibling names.

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 only 25% — only customer_id is documented. draft_id, video_url, and connection_context carry no schema descriptions, and the tool description says nothing about them (e.g., where draft_id originates or the format of video_url), so the coverage gap is not compensated.

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?

States a specific verb ('Confirm creation') and a specific resource ('Google Ads YouTube video asset reference'), which distinguishes it from other confirm tools in the family. However, it never references its prepare counterpart (google_ads_youtube_asset_prepare), so it does not fully differentiate itself within the prepare/confirm pair.

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?

There is no guidance on when to call this versus alternatives. Nothing states that it should follow google_ads_youtube_asset_prepare or that draft_id must come from a prior prepare step, which is essential context for a confirm tool.

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