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

The annotation idempotentHint=false is directly contradicted by the description's statement 'Idempotent on acpIntentId — a second call with the same intent returns the prior outcome with replay=true.' This is a clear annotation contradiction, and per the rubric the score is 1 regardless of other behavioral details.

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?

The description is four sentences with no fluff. It front-loads the core purpose, then gives the workflow sequence, idempotency behavior, and return shape—each sentence earning 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?

Despite no output schema, the description details the return format and statuses. It also covers the call sequence and replay behavior. However, the parameter coverage gap and the idempotency contradiction prevent full completeness, so a 4 is appropriate.

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 compensate. It only adds meaning for acpIntentId (as the idempotency key) and holdId (as the 'optional inventory hold'), leaving orderId, agentBearer, and consumerAgentKind entirely unexplained. This is insufficient compensation for 5 parameters.

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?

The description opens with 'Finalize a droplinked order using a Stripe ACP payment intent and an optional inventory hold,' which clearly states the specific action and resource. It distinguishes itself from sibling tools (e.g., quote_inventory_available, find_inventory) by being a finalization/payment step, not a quotation or lookup.

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?

The description explicitly states when to use it: 'The consumer agent calls this after find_inventory + quote_inventory_available + Stripe ACP create_payment_intent.' It also says it 'Closes the agent-to-agent transaction loop,' providing clear usage context and sequencing. This meets the 5-point standard of explicit 'when' guidance.

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