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

Annotations already mark the operation as read-only and non-destructive; the description adds useful behavioral context by stating that it returns a page plus a self-monitoring card that keeps the letter draft visible and notices when the human returns. It also clarifies that payment is not handled by this API call but happens in the browser.

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 front-loaded with the core action and supported items, then adds only essential behavioral details. The bilingual repetition is slightly redundant but does not hurt scanning, and there is no 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 two-parameter tool with no output schema, the description covers the trigger, the three target values, the returned artifacts (page/card), and the payment boundary. It does not describe the output format or the purpose of 'reasoning', but an agent has enough context to select and invoke it 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?

The schema already documents the 'gap' enum well, so the description's restatement of the three values adds minimal value. The optional 'reasoning' parameter is undocumented in both the schema and the description, and with only 50% schema coverage the prose should have filled that gap.

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 names a concrete action ('hands one item over to the human in a browser') and enumerates the three supported gaps: balance top-up, AVV consent, and sender profile completion. It is clear about the resource and expected outcome, though it does not explicitly distinguish itself from sibling tools like wallet_topup_link.

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 intended context is evident: use this when a setup item must be completed by a human in the browser, and the statement that 'payment always happens in the browser' clarifies a boundary. It does not name alternatives or state exclusions, 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.