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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=true, but the description adds the critical runtime fact that checkout is not live and the call returns a not-available notice rather than a payment link. The security warning about never sending card numbers is a valuable additional constraint. Permissions, rate limits, and the exact response shape remain undisclosed.

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 short sentences, front-loaded with the most decision-relevant caveat ('Checkout is not live yet'), and no filler. The card-number warning earns its place as a security constraint. Slightly terse given how little it says about the order payload.

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?

There is no output schema, so the description carries extra weight, and it does disclose the degraded return behavior and the quote fallback. But it omits the parameter semantics entirely and gives no sense of whether the returned quote is needed before any future checkout step, leaving an agent under-informed for a mutation 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 0% for the top-level parameters: neither the items array (maxItems 10, per-item quantity cap of 10) nor the country enum (US-only) is explained anywhere in the description. The phrase 'accepts an order' loosely gestures at the items array but adds no real semantics, so the description fails to compensate for the coverage gap.

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 verb+resource (create a checkout link) and, crucially, discloses that the resource is not live so the tool currently returns a notice plus an order quote. That honesty makes the actual runtime behavior unambiguous. It stops short of contrasting itself with siblings like get_shipping_quote, which also deals with quotes.

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?

It implies usage conditions by explaining that the tool accepts an order and returns its quote, and warns against sending card numbers. However, it never says when to call this versus get_shipping_quote or get_product, so the agent must infer the routing.

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