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

Annotations already declare destructiveHint=true and openWorldHint=true, and the description adds genuine context beyond them: the preview-vs-commit gate, the sign-in requirement, and the non-empty-cart precondition. It stops short of describing irreversibility or failure modes when the order fails, but it is well above the annotation baseline.

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, each carrying a distinct obligation (purpose, prerequisite, confirm gate, preconditions). The critical commit-gate detail is placed early and nothing is 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?

An output schema exists so return values need not be explained, and annotations cover the safety profile. The description supplies the prerequisites and the confirm gate, leaving only edge cases like the active-order conflict to the schema — adequate, though a note on irreversibility would complete 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 description coverage is 100%, so confirm, addressId, voucherCode, paymentTypeId, and confirmActiveOrder are already fully documented. The description reinforces confirm's semantics but adds nothing new about the other four parameters, so baseline 3 applies.

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 ("Place the order from the current cart") and distinguishes itself from the adjacent review_order tool by naming it explicitly. An agent can tell immediately that this is the terminal commit step, not a read or preview.

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 explicit sequencing ("Call review_order first so the customer can confirm the total"), the condition for real placement versus preview (confirm:true), and preconditions ("Requires sign-in and a non-empty cart"). There is essentially no inference required to decide when to call this.

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