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

Annotations already cover safety and idempotency hints: readOnlyHint=false, idempotentHint=true, destructiveHint=false, openWorldHint=true. The description adds meaningful context that tax is collected under current merchant policy, that the existing quote is subtotal only and cannot authorize credit spend, and that the same key/body should be reused after uncertainty. It does not describe permissions or response details beyond the quote itself.

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 three tight sentences with the main purpose front-loaded. The contrast with the existing quote and the retry instruction both add useful information without filler.

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 tool with five required parameters, no schema descriptions, and no output schema, the description leaves most call requirements undocumented. It clarifies the quote's purpose and retry behavior, but an agent would still lack guidance on draft_id, version, proof_id, and send_intent_id.

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% for six parameters, so the description must carry parameter meaning. It only hints at client_reference and idempotency_key/body, while leaving draft_id, version, proof_id, and send_intent_id 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?

The description states a specific verb and resource: obtain an exact final prepaid quote with tax collected under current merchant policy. It also distinguishes this from the existing quote, which is subtotal only and cannot authorize credit spend.

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?

It explains when to use this tool by contrasting it with the existing quote, which cannot authorize credit spend. It also gives retry guidance: reuse the same key/body after uncertainty. It does not explicitly name a sibling alternative or list exclusions.

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