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

With no annotations, the description carries the full burden. It usefully discloses that prices are locked for 15 minutes, a real behavioral trait, but says nothing about what happens at expiry, whether inventory is held, auth requirements, idempotency, or what the call returns (no output schema exists to cover this).

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?

Two short sentences with the core behavior front-loaded and the SKU constraint as a follow-up; nothing is wasted. It is arguably too terse, but every sentence earns its place.

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 tool with no annotations, no output schema, no parameter descriptions, and many order/payment siblings, the description omits too much: the downstream use of the quote, expiry behavior, and the return value (e.g., a quote identifier) an agent needs to proceed.

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 coverage is 0%, so the description must compensate for a nested items[].sku/quantity structure. It does add one genuinely useful rule—merch SKUs must use the 'merchv:' variant prefix—but leaves quantity bounds (1–10) and the overall item-list shape undocumented in prose.

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 names a specific action pair (validate items, lock price) with a concrete duration, which separates it from order-creating siblings like create_order and create_purchase_intent. It never literally says it creates a quote, relying on the title for the noun, so it falls just short of fully self-contained.

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?

There is no indication of when to call this versus create_order, create_purchase_intent, or create_purchase_intent's payment siblings; the 15-minute window implies a pre-checkout step but the agent must infer it. The only guidance given is a constraint (merch SKU format), not a use condition.

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