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

Goes well beyond the annotations (destructiveHint=true, idempotentHint=true): it discloses the mandatory two-step review-then-confirm pattern, that the first call changes nothing, that state is retained between calls so no extra data is needed, and the 10-minute/48-hour time constraints. It also describes what is returned (restored meal plus recomputed day).

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?

Front-loads the action, then the workflow, constraints, return value, and an example, in a logical order. Every sentence carries information, though the trailing 'statement is the customer-facing IZeat message' paragraph reads as reused boilerplate and slightly dilutes focus.

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, yet the description still usefully names the returned fields, and it covers the confirmation protocol, time limits, and account context. Nothing needed to invoke this correctly is missing.

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?

With one parameter at 100% schema coverage, baseline is 3, but the description adds real meaning: confirm must be true only on the second call after the customer agrees, and the first call must omit it. It does not restate the schema mechanically but contextualizes the flag within the workflow.

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 (restore) and a precisely scoped resource: the latest meal change undone via undo_last_change. It explicitly ties itself to the sibling it reverses, so an agent can distinguish it from undo_last_change without opening either schema.

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 explicit when-to-use ('when the customer says the undo was a mistake'), the required two-step flow, the 10-minute confirmation window, and the 48-hour eligibility limit. Alternatives and preconditions are fully spelled out rather than implied.

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