Confirm prepared ReceiptCal action

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

Annotations already declare destructiveHint=true, readOnlyHint=false, idempotentHint=false and openWorldHint=true, so the safety profile is covered. The description adds the important gate that execution must follow explicit user approval in a separate message, which is genuinely new behavioral context; it does not say whether the action_id is consumed or expires after execution.

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?

A single sentence with the operation front-loaded and the precondition trailing it; every clause earns its place and there is no boilerplate.

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 destructive, non-idempotent execution tool with no output schema and no parameter documentation, the description covers the confirmation gate but omits what happens on success or failure, whether the prepared action is consumed, and whether action_id has a validity window. Adequate but with clear gaps.

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 has to carry the load. It implicitly maps 'one prepared ... write' to action_id and 'explicitly approved' to user_confirmed, which is useful, but it adds no format, lifetime, or error semantics for action_id beyond the schema's min/max length.

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 (Execute) and a tightly scoped resource (one prepared ReceiptCal write), which cleanly separates it from the many prepare_* siblings that only stage an action and from cancel_action. An agent can tell what this does and what it does not do without opening the 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 an explicit precondition for use: only after the user has approved the displayed preview in a new message. It does not name cancel_action as the alternative when approval is withheld, nor state what to do if the user edits the preview instead, so the when-not path is left implicit.

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