Create Checkout for the authorized launch

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

Annotations already declare destructiveHint=true, openWorldHint=true and idempotentHint=false, so the safety profile is covered; the description adds genuinely new behavior: payment is human-mediated, only verified paid settlement queues jobs, and the $99 fee is immutable. That is context an agent could not get from structured fields. Minor tension: 'stable purchase key' hints at retry idempotency while idempotentHint=false, though the key-reuse wording originates in the schema rather than the description.

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?

Two dense sentences with no filler, but they are front-loaded with preconditions rather than purpose, and jargon like 'saved immutable service fee' and 'stable purchase key' costs the reader more than it conveys.

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?

There is no output schema, and the description says nothing about what is returned from a checkout (a URL, an order, a task reference) or what the agent should do next. For a payment-adjacent mutation in a 30+ tool surface, that leaves a real gap, though annotations and the schema cover safety and inputs adequately.

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 coverage is 50%: idempotency_key is documented in-schema, launch_id is not. The description only restates that a launch ID is required and labels the key as 'stable purchase key' without explaining format, scope, or what a launch ID identifies — partial compensation, so baseline 3.

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 never plainly states what the tool produces — it opens with required inputs and then describes the tool obliquely as a 'human payment fallback for the saved immutable service fee.' The verb+resource must be inferred from the name/title rather than read in the description, and no sibling (e.g. payment_instructions, get_order) is named to differentiate it.

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?

'Human payment fallback' and 'does not autonomously pay' imply the situation loosely, but there is no explicit when-to-use rule, no exclusion against alternatives like payment_instructions, and no stated follow-up step after a checkout is created. The agent must guess its place in the launch flow.

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