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

With no annotations provided, the description carries the behavioral burden. It usefully discloses that the call creates nothing chargeable and returns an opaque handle, which are key behavioral traits. It does not mention idempotency or error behavior, but for a zero-parameter create operation it gives solid transparency.

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 two sentences with no filler. It front-loads the core action and immediately follows with the most important return-value and side-effect information.

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 simple no-parameter tool with no output schema, the description explains what it does, what it returns, and that it has no immediate charge impact. It could add workflow sequencing relative to siblings, but the job_handle statement largely covers the caller's needs.

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 input schema is empty and schema description coverage is 100%, so parameter documentation needs no compensation. The description adds no parameter details, but none exist; the baseline for zero parameters 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 uses a specific verb and resource: 'Start a print-and-mail job.' It further distinguishes the tool by stating it returns an opaque job_handle used by every later call, which clearly separates it from checkout, payment, and quote siblings.

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 implies this is the initial step in a multi-call workflow by stating the returned job_handle is 'used by every later call.' It does not explicitly name alternatives or exclusion conditions, but the context is clear enough for an agent to know when to invoke it.

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