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

Annotations already declare readOnlyHint=false, destructiveHint=false, and openWorldHint=false, so the safety profile is known. The description adds the product-card linkage condition but says nothing about create-vs-overwrite semantics on name collision, what template_type values are accepted, or whether saving has side effects on linked product cards. Adequate but with real gaps for a write tool.

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?

Two tight sentences with the action front-loaded and zero filler. Nothing is wasted, though the brevity is partly the cause of the parameter and behavioral gaps.

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 exists, so return values need not be described. But for a 5-parameter write tool with a free-form nested payload object and no schema descriptions, the definition leaves an agent unable to know what to put in payload or template_type, or how 'save' behaves on an existing name.

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 5 parameters, so the description carries the whole burden, and it only explains one of them (product_ref). The required 'name', the nested open-ended 'payload' object, 'template_type', and the pattern-constrained 'connection_context' are all left without any semantic explanation.

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 gives a specific verb and resource: 'Save a reusable Google responsive search ad template.' An agent can tell it apart from listing or deleting templates. It does not, however, distinguish it from the sibling google_ads_template_update, which matters for a 'save' that could be an upsert.

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 guidance on when to use this rather than google_ads_template_update or why one would save a template at all. The only conditional clause ('when product cards are enabled') describes when a parameter applies, not when the tool should be chosen.

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