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

Beyond annotations, the description discloses that the tool 'calls the channel (a live read)' and 'rebuilds the integration', and that it mutates state by refreshing rewrite rules. It also explains that the effect is visible in get_ad_attributes after the call. The annotations (idempotentHint, destructiveHint false, readOnlyHint false) are consistent with this description, so there is no contradiction.

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 longer than average but front-loads the core action and usage trigger before moving to return shape and parameter notes. Some redundancy exists between the second sentence and the later 'after this attributes appear' sentence, but overall each section adds workflow value.

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 tool with no output schema, the description provides the full return shape, the prerequisite category-mapping step, the downstream mapping step, and the post-call re-export requirement. It could add error cases or clarify the 'kind' field in the return, but nothing essential to selecting or invoking the tool is missing.

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 compensates by explaining that ad_id comes from list_ads and that project_id is optional unless project_id_required is set, in which case the agent should call list_projects. It does not fully describe the semantics of project_id, but it gives the agent enough sourcing and conditionality information to invoke correctly.

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 states a specific verb ('Fetch', 'refresh') and resource ('the channel's CATEGORY attributes', 'rewrite rules'), and clarifies it is the same action the wizard's 'Update Category Attributes' runs. The ad-specific scope is clear and distinct from the sibling refresh_marketplace_category_attributes.

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?

It explicitly says when to run it: after configuring the category-mapping step, so category-specific required attributes appear in get_ad_attributes. It also gives follow-up guidance to re-export/submit afterward. It does not explicitly name an alternative tool for exclusion, but the ad-vs-marketplace distinction is strongly implied by the name and sibling list.

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