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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the safety profile is covered. The description adds meaningful context beyond that: a shareable link is produced, the link expires after the chosen number of days, and "nothing moves until the payer funds it" — clarifying that this call itself transfers no value. It does not address auth requirements or whether repeated calls create duplicate links.

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, front-loaded with the core action, then the flow, then the optional parameters and the key safety caveat. No filler and nothing redundant.

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?

With no output schema, the description correctly states what the caller receives — a shareable link — and covers the deferred-funding behavior an agent needs to set expectations. It could go slightly further by describing what else the response contains (request identifier, expiry) but is sufficient to call the tool correctly.

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 coverage is 100%, so the baseline is 3. The description does add one thing the schema omits: the default of 7 days for the expiry parameter (the schema specifies only min/max), and it restates the 140-character note limit. Otherwise it mirrors what the schema already documents.

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 and resource ("Creates a payment request") and immediately describes the two-sided flow: the recipient asks to be paid, the payer funds the link. This clearly separates it from sibling tools like ifso_prepare_payment, which appear to move funds rather than solicit them.

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 description makes the usage context clear — use this when someone needs to be paid via a shareable link, and the payer funds it later. It does not explicitly name alternatives or exclusions (e.g., when to use this versus ifso_prepare_payment directly), so it stops short of full routing guidance.

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