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

Annotations cover the basic profile (not read-only, not destructive, non-idempotent, open-world), and the description adds real context: payment is via a Stripe link, order is confirmed by email only once paid, unpaid orders are not shipped, delivery is UAE-only, and prices are retail AED including VAT. It omits the risk implied by idempotentHint=false (calling twice may create duplicate orders/charges), which would be valuable for an agent deciding whether to retry.

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 dense sentences, front-loaded with the action and payment-link outcome, then preconditions, then post-purchase and delivery semantics. No padding or repetition.

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 nested, non-idempotent mutation with no output schema, the description covers what happens after the call (payment link, email confirmation, shipping) and the delivery/pricing constraints. Remaining gaps are failure/retry behavior and whether the payment link expires — minor but noticeable for a checkout tool.

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 50% and the description adds little parameter-level meaning — it does not explain how to build the items array or customer object beyond noting retail AED pricing. The schema itself documents product_id, email matching, phone, address and locale well, so a baseline 3 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?

States a specific verb and resource ("Create a GENOSYS UAE order") and adds the distinctive outcome (a secure Stripe payment link), which separates it from siblings like create_bag_link, open_checkout and order_status. An agent can identify the tool's job without opening the schema.

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?

Gives an explicit precondition: "Call only after the shopper has confirmed the items, the total and their delivery details," plus a hard scope limit (UAE delivery only). It does not name which sibling to use when the precondition is unmet (e.g. create_bag_link before confirmation), so it stops short of full routing guidance.

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