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

Annotations already declare destructiveHint=true and idempotentHint=true, but the description adds real context beyond them: the required OAuth scope (order:submit), the fact that it mutates buyer or order state, and the retry semantics that make idempotency safe. Only failure/error behavior is left unstated, which keeps this just short of a 5.

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 tightly-packed sentences with zero filler; the gating precondition and 'never bypass confirmation' warning are front-loaded, and the trailing scope/state note is short. 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?

With an output schema present, the description needn't cover return values, and it does cover precondition, authorization, and retry behavior. Only failure/partial-failure handling is absent, a minor gap for a destructive, idempotent mutation.

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 both parameters are already documented in detail (pattern, origin, REST header). The description restates that the token and idempotency_key are required and adds the retry-the-same-key rule, but contributes little beyond the schema. 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 (submit an order) plus its hard precondition (already approved by the buyer on the confirmation page). This clearly separates it from the sibling prepare_order, which precedes approval, so an agent can route correctly without opening either 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 explicit when-to-use ('only an order already approved'), an explicit when-not ('Never bypass confirmation'), and retry guidance ('retry the same key after uncertainty'). The conditions that select this tool versus prepare_order are fully spelled out.

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