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

Adds real behavior beyond the annotations: the order is unpaid, the result is sealed before payment, the tool does not charge, approve spending, or touch buyer credentials, and the buyer independently decides whether to pay via the Stripe MPP/SPT flow. Annotations only supply the generic non-readonly/non-destructive/non-idempotent profile, so this context is genuinely additive. Minor tension: 'read the live catalog' for dynamic price/availability sits awkwardly with openWorldHint=false, though this is not a direct contradiction.

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 sentences, front-loaded with the action and price reality-check, then the submission flow, then the negative scope guarantees. Slightly promotional in tone ('genuine transaction', 'GovOmniAI') but no sentence is wasted.

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 mutation-style order-creation tool with no output schema and no meaningful annotations, the description covers the payment/authorization boundary well but omits what the created order returns (order id? sealed artifact?), what the buyer does next, and any semantics for the enum-heavy transaction payload. Adequate but with clear gaps.

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 4 parameters, including a nested transaction object with six required risk fields (amount_cents, currency, reversibility, data_sensitivity, operational_impact, autonomy) and optional external_side_effects. The description names only 'transaction' and 'declared evidence' generically and never explains the meaning or expected values of those risk dimensions, nor buyer_email/buyer_reference, 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?

States a specific verb and resource ('Create an unpaid ... Agent Action Assurance Check order') and immediately differentiates it from the near-identical sibling create_agent_action_assurance_order_1usd by naming the live-catalog price check and the 'introductory 50 US cents' figure. An agent can pick between these without opening a 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 clear operational context: read the live catalog for seller/price/availability/terms, then submit the transaction and evidence, with the seal happening before payment. It does not, however, route the agent away from the free sibling assess_autonomous_transaction_risk_free or qualify_federal_opportunity_free when a paid assurance order is unnecessary, so the when-not condition is left implicit.

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