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

Annotations already declare non-read-only, idempotent, open-world, non-destructive. The description adds behavior beyond them: credits are reserved (a real cost commitment) and an external collection process is launched, plus guidance to reuse the idempotency key. It does not cover retry semantics or what happens if the quote is stale/expired.

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 short sentences, zero filler, with the gating precondition front-loaded before the side effects and the idempotency reminder. Every sentence carries distinct information.

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 4-required-param mutating tool with an output schema, the description covers the essential prerequisites, cost implication, and idempotency. The remaining gap is that brandId/quoteId semantics are undocumented anywhere, since the schema provides no parameter descriptions.

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 must compensate and it only partially does: it references maximumCredits (as a user-accepted ceiling) and idempotencyKey (reuse). brandId and quoteId get no explanation, and the link between quoteId and the accepted quote is left implicit.

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 verb+resource (start research) plus two concrete side effects: reserving credits and launching external collection. It implies the ordering relative to quote_research ("only after the user accepts the exact quote") but never names that sibling, so an agent must infer the full workflow sequence.

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?

Gives a clear precondition for use (user must have accepted the exact quote and maximum credits) and a reuse instruction for the idempotency key. It stops short of naming the alternative/prior tool (quote_research) or stating when not to call it, but the gating condition is explicit.

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