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

Annotations already declare readOnlyHint=false, idempotentHint=true, destructiveHint=false, and openWorldHint=true; the description confirms this is a non-destructive draft creation that is safe to reuse, and adds concrete behavioral context beyond the annotations: no payment is submitted, the returned challenge is what the paid retry must bind to, and the preflight is non-blocking. It does not state auth/permission requirements or what happens to a previously bound challenge on retry.

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 primary action and its key constraint (no payment submitted), followed by what is returned and the retry binding rule. No filler; each sentence carries an actionable fact.

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?

An output schema exists, so return values need not be spelled out, and the description still usefully characterizes the return (bound x402 challenge plus non-blocking payer balance/eligibility preflight). For a mutation tool with a nested request object, the main remaining gap is the undocumented payerAddress and the structure of `request`.

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 has to compensate. It explicitly names three of the four parameters (providerAgentId, outcomeId, request) and adds the important constraint that the paid retry must carry the identical values, which the schema cannot convey. However, it says nothing about the contents/shape of the nested `request` object or about payerAddress, leaving half the parameter surface unexplained.

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 compound action (obtain a binding quote; create or reuse a draft order) and explicitly scopes it as not submitting payment. It also names the sibling that performs the payment step (daski_buy_outcome), so the agent can separate the prepare tool from the buy tool without opening either 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?

The description makes the call sequence clear: this is the pre-payment step whose challenge feeds daski_buy_outcome, and the retry must reuse the same providerAgentId, outcomeId, and request. It stops short of stating explicit exclusions (e.g., when not to call it, or how it relates to daski_get_order_status / daski_cancel_order for an existing draft).

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