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

With no annotations, the description carries the behavioral disclosure burden. It discloses that the job is asynchronous, that job_token is shown only once, and that a 402 fallback returns payment requirements. It does not cover failure modes or side effects beyond payment, but it covers the most important behaviors.

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 compact, front-loaded with the primary action, and every sentence adds necessary information. The conditional fallback is technical but essential and clearly explained.

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?

The description explains return values despite lacking an output schema, covers the asynchronous nature, and details the payment fallback. It could mention how to use the returned job_id/job_token with sibling status/result tools, but that is inferable from the sibling names.

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 description links quote_id to the quote being paid for, adding meaning beyond the bare schema field. idempotency_key is already described in the schema, so the description's indirect mention of retry is acceptable. The 50% schema coverage is partially compensated by the description.

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 clearly states the tool's action: paying for a quote and starting an asynchronous verification job. It is distinct from sibling tools that quote or retrieve results, and it specifies the key outputs (job_id, job_token).

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 context is clear: this is used after obtaining a quote and before checking verification status/results. It also explains the fallback flow when payment is not supported, though it does not explicitly name sibling tools as alternatives or state when not to use it.

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