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

Annotations already declare readOnlyHint=true and destructiveHint=false, so safety is covered. The description adds valuable behavioral context: it returns the latest response 'if one exists,' and it parses and VERIFIED refusal grounds with cited registration numbers from the OA text. It also establishes an authoritative-data rule (refusal_grounds over document title), which is a behavioral trait not inferable from annotations or schema.

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: the first front-loads the core functionality plus additions, the second delivers a critical usage rule. No filler or redundancy.

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 read-only tool with one well-described parameter and no output schema, the description sufficiently explains inputs and expected outputs (OA, optional response, refusal grounds). It also includes a directive that prevents common errors. The absence of explicit return-format details is acceptable given there is no output schema.

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 schema covers 100% of parameters with a description for serial_number ('USPTO serial number'), so the baseline is 3. The description does not add format examples or constraints beyond the schema, but no additional semantics are needed given the single, well-described parameter.

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 uses a specific verb and resource: 'Get the latest office action for a trademark serial number,' and further specifies it also returns the latest recorded response and verified refusal grounds with cited registration numbers. This clearly distinguishes it from sibling tools like get_prosecution_document or list_prosecution_documents by focusing on the latest OA and parsed refusal grounds.

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 description clearly implies when to use this tool: whenever you need the latest office action and its refusal basis. It provides an explicit usage instruction: 'Use refusal_grounds as the authoritative answer... never infer the basis from the document title or general knowledge.' However, it does not explicitly name alternative tools or state when not to use it, so it falls short of a 5.

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