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

Annotations already declare readOnlyHint=true, destructiveHint=false and openWorldHint=true; the description usefully reinforces that no state is persisted and that the response is a corrected address. It stops short of saying what happens when the address cannot be corrected (error vs. partial suggestions).

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 compact sentences, the side-effect disclaimer front-loaded and the API path last. Nothing is padded.

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 single-parameter read-only validator with annotations covering the safety profile, the key facts (no persistence, returns corrected address) are present. Only the failure/uncorrectable-address behavior is left unaddressed, and there is no output schema to describe the response shape.

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% and every nested recipient field (state_code, province, country_code, etc.) is documented in the schema, so baseline 3 applies. The description adds nothing about the required nested fields or formats.

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 ('Check a recipient address') and the concrete result ('return FinerWorks' corrected version'), plus the underlying endpoint. No sibling in the list performs address validation, so the resource is unambiguous.

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?

'Nothing is saved or ordered' implies this is a pre-flight check to run before creating an order, but the description never says so explicitly and names no alternative or exclusion. Usage is inferable rather than stated.

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