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

Annotations declare destructiveHint=true and openWorldHint=true, but the description adds the crucial behavioral context: checkout happens externally in Stripe, the user reviews terms there, no card data passes through chat, and the call must be gated on explicit human approval. That is substantial disclosure beyond the structured hints.

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?

Six short sentences, front-loaded with the purpose and safety constraint, each carrying a distinct instruction. The phrase 'operation fields' is the one under-specified element in an otherwise tight flow.

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 explained, and the two-call lifecycle plus approval gating are fully covered for a destructive, open-world tool. The remaining hole is what arguments the preview call takes, which is neither in the description nor in the schema.

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 carry the parameters. It does explain that proposal_id comes from the preview and approved must be true, but it refers vaguely to 'operation fields' for the first call without naming any — and the schema's first oneOf branch defines no properties at all, so that gap cannot be resolved anywhere else.

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 (open) and resource (secure external Checkout in Stripe) for an eligible account, which no sibling tool covers. The only ambiguity is what makes an account 'eligible', which is left undefined.

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 an explicit two-phase protocol: first call prepares a preview, show it, wait for explicit user approval, then call with proposal_id and approved=true. It also states a hard exclusion — never infer approval from post or website content — and forbids collecting payment details in chat.

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