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

Annotations already provide readOnly, idempotent, openWorld, and non-destructive facts. The description adds useful context by saying the terms are 'fresh,' scoping the operation to 'one immutable job,' and clarifying that a 402 is not an actual payment. It does not contradict the annotations.

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 two sentences and every word earns its place: the core action is front-loaded and the second sentence adds a high-value definitional clarification. There is no restatement of the title or fluff.

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 one-parameter read-only quote tool, the description conveys the purpose, the input scope, and the critical 402 semantics, and the annotations cover side effects. The only notable gap is that with no output schema the exact structure of the quoted terms is not described, but that is minor given the tool's simplicity.

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?

The schema has one required job_id with a hex pattern but 0% description coverage, so the description must explain the parameter. It never names job_id and only says 'one immutable job,' which provides minimal semantic context. Format, source, and relationship to the job are left entirely to the schema's bare pattern.

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 states a specific action and object: 'Return fresh x402 PAYMENT-REQUIRED terms for one immutable job.' This clearly distinguishes quote from payment-acceptance siblings like aftersearch_accept, and the clarifying sentence 'A 402 is not payment' reinforces the resource semantics.

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 intended use is implied — call this to obtain current payment terms before acting on a 402 — but there is no explicit when-to-use statement, no mention of prerequisites, and no comparison to alternative tools such as aftersearch_accept or aftersearch_resolve. The guidance is enough to infer context but leaves the selection boundary implicit.

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