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

Annotations already declare readOnly, openWorld, non-destructive and non-idempotent, so the safety profile is covered. The description adds genuinely new context: credit cost per successful call, that repeated calls may charge again (consistent with idempotentHint=false), and an untrusted-data warning. It omits return format/pagination, but the billing and trust disclosures are real value beyond structured fields.

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?

Four short sentences, purpose front-loaded, with cost and trust caveats following. No filler; each sentence carries a distinct, useful fact.

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, return values are not described, which is a gap. However, the description covers the operation, billing model, repeat-charge behavior and a data-trust caveat, which is sufficient for a simple single-record read whose annotations already carry the safety profile.

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 100%, so the schema already documents office, brandId and returnFields including examples. The description only restates the two required keys and adds no format or syntax detail beyond the schema. Baseline 3 applies when 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?

States a specific verb (Retrieve) and resource (trademark record) plus the lookup keys (office and identifier). This distinguishes it from global_brand_list/range/stats by implying a single-record lookup, but it never names those siblings explicitly.

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?

The phrase 'by office and identifier' implies usage, but there is no explicit when-to-use guidance, no prerequisites, and no routing to the sibling list/range/stats tools that cover the same resource family. The agent must infer that this is the single-record path.

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