create_catalog_zone

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

With no annotations, the description bears full responsibility for behavioral disclosure. Beyond the action 'Create', it reveals nothing: no permission requirements, side effects, reversibility, relationship to other entities, or response format. The phrase 'for product/retail ad serving' is purposive, not behavioral. This is essentially a tautology of the tool name.

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 a single, short sentence with no redundant words. It is front-loaded with the action and resource, and the purpose qualifier is concise. There is no filler or repetitive content.

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?

Given the tool's complexity (10 parameters, no output schema, no annotations), the description is too minimal. It does not explain what the response contains (e.g., created zone ID), any required prior steps, or how catalog zones relate to other entities. The schema covers parameters but not the overall operational context. The description fails to provide enough context for an agent to confidently use the tool without additional discovery.

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 input schema has 100% description coverage for all 10 parameters, including enums and ranges. The description adds no parameter-specific meaning, but the schema already documents each parameter sufficiently. Baseline 3 is appropriate as the schema does the heavy lifting.

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 clearly states the action ('Create') and the resource ('catalog zone') with the specific context ('for product/retail ad serving'). It is distinct from generic 'create_zone' or 'vast_create_zone' by naming 'catalog zone', though it does not explicitly differentiate among sibling zone creation tools. Clear and specific but not fully distinguished from all siblings.

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 tool versus alternatives. It does not mention prerequisites, such as requiring an existing catalog_id, or any scenarios where this tool is preferred over other zone creation tools. The description simply states what the tool does without any usage context.

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