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

Annotations already tell the agent this is a non-read-only, non-idempotent, open-world operation, and the description adds useful context that it opens a $39 Stripe checkout. It still omits key behavior for a payment tool, such as whether it merely creates a checkout session versus charges the card, what is returned, and what happens if it is called repeatedly given non-idempotency.

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 a single front-loaded sentence with no filler, and the price and action are immediately visible. Its terseness is a conciseness strength, though it leaves too much unsaid in other dimensions.

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 four-parameter payment-initiating tool with no output schema and no parameter descriptions, the description is materially incomplete. It does not explain required fields, return values, or the checkout lifecycle, so an agent must rely on guesswork for safe invocation.

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 0%, so the description must compensate for four undocumented parameters. It only indirectly clarifies the 'stl' parameter as an uploaded STL and says nothing about the required 'name' and 'contact' fields or the optional 'notes' field.

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 states a specific action (open a Stripe checkout) and a concrete resource (an uploaded STL) with a fixed price of $39, so the core purpose is clear. It does not, however, distinguish itself from adjacent tools such as print_plate_quote, print_plate_status, or print_plate_upload, leaving the agent to infer the flow.

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 'for an uploaded STL' implies a prerequisite (the file must already be uploaded), but there is no explicit guidance on when to use this versus print_plate_quote or print_plate_status. No exclusions, ordering, or alternative conditions are provided.

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