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

Annotations already declare readOnly, idempotent, non-destructive and closed-world, so safety is covered. The description then adds genuinely non-redundant behavior: the output is 3-5 plain sentences, items are deduped across campaigns, and the report spans fixed +7/-7 day windows. It stops short of describing pagination or failure modes, but for a read-only summarizer this is solid added context.

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 sentences, front-loaded with the core purpose before enumerating contents. Efficient overall, though 'in one call' appears twice and could be tightened.

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?

With no output schema, the description correctly takes on the burden of describing the return payload (sentence count, contents, link) and does so concretely. Combined with annotations covering the safety profile, an agent has what it needs; only the absence of explicit sibling routing keeps it from a 5.

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 one parameter (brandId) and schema description coverage is 100%, with the schema itself pointing to list_brands for sourcing the id. The description adds no further parameter semantics, so the baseline 3 applies.

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 names a specific resource (the brand brief) and spells out exactly what it contains: items awaiting the owner, upcoming/live content windows, failures with cause and next step, and one link. It signals brand-level scope distinct from campaign-level siblings, but never names a specific sibling it differs from (e.g. get_brand_guide), so differentiation is implied rather than stated.

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 is implied rather than prescribed: 'covers every campaign in one call' suggests this replaces per-campaign listing, but there is no explicit when-to-use or when-not, and no alternative tool is named despite many close siblings (get_brand_guide, get_results_verdict, list_campaigns).

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