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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so safety is somewhat covered, but the description adds no behavioral context: it never explains what 'prepare' actually produces (a pending plan?), whether a confirm call must follow, or any auth/rate constraints.

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 short sentence, front-loaded with the verb and scope. It is efficient, but the brevity reflects under-specification rather than tightness, so it is only adequate.

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 6-parameter mutation-flow tool with no output schema and low schema description coverage, the definition is too thin: it omits the confirm dependency, the items/batch shape (max 10), and what the prepare response represents.

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?

Only customer_id is briefly documented in the schema (17% coverage), and the description merely echoes the entity types (campaign/ad group/ad) without mapping them to entity_level or explaining entity_id, the items array, ad_group_id, or connection_context. With low coverage the description should compensate but does not.

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 (prepare enabling) plus the target resources (campaign, ad group, or ad), which tells an agent what the tool acts on. It does not, however, distinguish the prepare step from its confirm counterpart or from the pause variant, leaving the two-phase nature to be inferred 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?

There is no guidance on when to call this versus google_ads_status_enable_confirm, or how the prepare/confirm flow works. The agent must infer the two-step pattern purely from sibling naming with no stated condition or prerequisite.

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