Returns get label

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

The description is fully transparent about the read-only, idempotent nature of the operation, the short-lived signed URL, expiry behavior, and the availability precondition. This aligns with the annotations and adds useful operational detail.

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 concise, with every sentence providing meaningful detail and no redundant content.

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?

The description explains what is returned (a short-lived signed URL for a PDF), the expiry/refresh behavior, and a key precondition. Since there is no output schema, this is sufficient for most use cases, though error conditions are not described.

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 only parameter, return_id, is fully described by the schema with a UUID format and pattern, and the description repeats that it identifies the return. Schema coverage is 100%, so baseline is appropriate.

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 clearly states the tool fetches a short-lived signed URL for a return shipping label PDF, making the specific resource and action 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?

It explicitly notes that the URL expires within minutes and that re-calling is needed for a fresh one, and it states the precondition that the return must have reached label_ready. It does not compare with sibling tools, but the usage context is clear.

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