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

Annotations are absent, so the description carries the full burden of disclosing side effects and progression. It only says 'prepare creating a paused responsive search ad'—it does not explain whether this validates inputs, creates a draft, mutates state, or returns a reference for confirmation. The word 'paused' hints at the ad's status but not the tool's behavior.

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 one short sentence, but this is under-specification rather than efficient conciseness. It front-loads nothing useful—the single sentence cannot earn its place because it repeats the essence of the tool name without adding context.

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 five required parameters, no output schema, and no annotations, this definition is grossly incomplete. The agent has no idea what the prepare step returns, what the 'confirm' companion does, whether a paused ad is immediately created, or what valid values for headlines/descriptions/final_urls look like.

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 description adds no meaning to any of the five required parameters. Schema description coverage is only 20% (only customer_id is described), and the description does not compensate by explaining headlines, descriptions, final_urls, or ad_group_id. It provides zero semantic value beyond the schema.

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 verb ('prepare') and a resource ('creating a paused responsive search ad'), so it is not a pure tautology. However, 'prepare' is vague about what actually happens, and it does not differentiate the tool from the sibling 'google_ads_responsive_search_ad_create_confirm'—the agent must infer the prepare/confirm workflow from the name alone.

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 offers no guidance on when to use this tool versus its siblings (e.g., the confirm step, other create_prepare tools). There is no mention of the two-step workflow, prerequisites, or conditions that would route an agent here.

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