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

Goes well beyond the annotations (which only say non-read-only, non-open-world, non-idempotent, non-destructive) by disclosing the synthetic settlement model, no real signer or funds, the 120 virtual USDC simulation ceiling vs the 25 USDC real escrow cap, 24-hour expiry, a 64-active-simulation bound, rejected payment headers, and the absence of inventory/shipping/tax/ownership checks. This is exactly the extra context an agent needs before invoking a money-shaped tool.

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?

Front-loaded with the critical 'Simulation only' qualifier and organized roughly around create-then-continue flow. It is dense and the negative enumeration (no inventory, shipping, tax, ownership assertion, authorization, fulfillment) plus the catalog/API-fee remarks are informative but slightly beyond what is needed to call it.

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 7-parameter, multi-action tool with no output schema and only bare annotations, the description covers simulation limits, expiry, capacity, rejection rules, and token handling. It stops short of describing what each action (especially status) returns, but the safety and lifecycle picture 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%, so the description must carry the load and it largely does: it explains product_id, buyer_wallet, order_token (bearer token to retain), idempotency_key (exact create retries), fulfillment_reference, and the action values. It does not explain the simulation const flag or the format constraints, which the schema's patterns still cover.

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+resource ('Create a boutique order with product_id and buyer_wallet') and scopes it as a simulation, then enumerates the order lifecycle actions it also serves. It implicitly separates itself from siblings like wever_boutique-real-money-acceptance ('real checkout is disabled') and the catalog tools ('Catalog tools remain read-only snapshots').

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?

Explicitly describes the call sequence: create with product_id/buyer_wallet, retain the returned bearer order_token, then repeat the same identifiers with action=initiate_payment/simulate_payment/status/confirm_fulfillment. It states the extra requirement for confirm_fulfillment (fulfillment_reference) and the idempotency_key retry contract, and rules out what is rejected.

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