Create a product group

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

Annotations already declare this as a non-read-only, open-world, non-idempotent mutation, so 'Changes the account' largely restates readOnlyHint=false. Beyond that, the description discloses nothing about required permissions/scopes, what happens on duplicate names (relevant since idempotentHint=false), or what identifier is returned, which are the behaviors an agent actually needs.

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 prose is two tight sentences front-loading the action and the account-mutation note, and the example earns its space for a free-form nested object. The multi-line JSON wrapping is slightly awkward to parse but contains no filler.

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 create tool with a nested free-form required object, no output schema, and no documented return value, the definition is only partially complete: it omits ad_account_id handling and any statement of what is returned (e.g., the new product group ID) or the catalog-vs-feed prerequisite chain. The payload example compensates for the biggest gap but not all of them.

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?

With 0% schema description coverage the description must carry the parameter burden, and it does supply a concrete, annotated product_group example with catalog_id, country, locale, name, and nested filters/all_of clauses. However, ad_account_id is never mentioned, and the filters semantics (all_of, inclusion) are shown only by example rather than explained.

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 opens with a specific verb+resource: 'Create a catalog product group,' which is clearly distinguishable from the sibling update/delete/list product group tools. It does not explicitly name those alternatives, but the create verb leaves no ambiguity about the operation.

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?

Usage context is only implied; there is no explicit 'use this when... do not use this for...' guidance relative to update_product_group or the promotion tools. The one conditional hint ('Feed-based groups use feed_id instead of catalog_id') gives useful branch guidance but is buried inside the payload example rather than stated as a rule.

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