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

Annotations only say readOnlyHint=false/destructiveHint=false, so description carries the burden. It discloses key behaviors: no card data passes through the agent, link expires after 24 hours, no credential needed, and shipping address prices ta/shipping into the link. These add meaningful operational context beyond annotations, though it does not mention other side effects like Stripe session creation.

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?

Four sentences, front-loaded with the core purpose and concise constraints. Every sentence adds necessary operational detail; there is no redundant filler.

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?

Tool has nested objects and 4 params, but description covers workflow, required input, link lifetime, auth requirement, and payment security. Output schema handles return-value expectations. Minor gap: no explicit note about buyer_name/buyer_email optionality, though schema covers it.

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 already covers 100% of parameters, raising baseline. Description adds meaning beyond schema: ring composition rule (one setting + one diamond), item id source, and shipping address purpose. This helps the agent construct valid arguments.

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 exactly what it does: assemble a cart and get a Stripe-hosted checkout URL the customer opens to pay. It clearly distinguishes from siblings (all search/info/consultation tools) by dscribing the payment checkout flow. No ambiguity.

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?

Describes the workflow context: item ids must come from search tools and shipping address is required for ta/shipping. It implies use after search and before payment. However, it does not explicitly name alternatives or state when-not to use it, such as directing consultation requests to request_consultation.

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