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

Adds real context beyond the annotations: the order is unpaid, the result is sealed at creation, and the response carries the MPP payment endpoint, order token, terms, and status URL. That clarifies the two-step create-then-pay flow that annotations alone (readOnlyHint=false, destructiveHint=false) do not convey. It does not address the non-idempotent behavior the annotations flag, so repeat calls creating new orders is left implicit.

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?

Three sentences, front-loaded with the action and scope, then the key behavioral fact (no charge), then the return contents. Every sentence carries information, though the flow sentence is slightly dense and could be split for scannability.

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 no output schema, the description correctly compensates by enumerating what the call returns (payment endpoint, token, terms, status URL). The main remaining gap is the undocumented nested 'offer' input, but the create-then-decide flow an agent needs to invoke this correctly is otherwise complete.

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% across three parameters, including a required nested 'offer' object with additionalProperties=true and no documented shape. The description explains what the order does but never says what the 'offer' payload must contain or what buyer_email/buyer_reference are for, so it 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?

Names a specific verb and resource (create an unpaid $3 verification order) and scopes it precisely: verifying the structure and integrity of an agent/service offer. The distinct wording ('verify the structure and integrity of an offer') separates it from the assurance-order and qualification-order siblings without needing to open their schemas.

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 clear situational context ('before relying on it') and a decisive boundary ('This tool does not charge the buyer'), which tells the agent this is a pre-commitment check, not a purchase. It does not explicitly name which sibling to use instead when the goal is assurance or federal qualification, so it stops short of full alternative routing.

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