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

Annotations declare this is not read-only, not destructive, and not open-world, so the safety profile is covered. The description usefully adds that the ad is created paused, which is a real behavioral trait beyond the annotations, but it does not explain what 'prepare' returns, whether a confirm step must follow, or what happens if the plan is abandoned.

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 zero waste, but for a six-parameter mutation tool this level of brevity reads as under-specification rather than disciplined concision.

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?

No output schema and no annotation coverage of the prepare semantics, so the description carries the burden of explaining the workflow and parameter requirements. It does neither, leaving the agent unable to tell what a successful prepare produces or how to proceed to confirmation.

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 17% (just customer_id), and the description adds nothing about the six parameters. Critically, it omits the content constraints an agent must satisfy for headlines, descriptions, and final_urls arrays (counts and character limits), leaving five required params essentially undocumented.

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 and resource: 'Prepare creating a paused responsive search ad.' An agent can identify what is being created and that the result is paused. It does not differentiate itself from google_ads_responsive_search_ad_create_confirm, but the prepare/confirm pairing is legible from the name.

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?

No when-to-use guidance, no mention that this is the first half of a two-step prepare/confirm flow, and no prerequisites. The only routing signal is the word 'Prepare' in the name, which the description merely restates.

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