complete_reminder

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

Annotations already indicate this is not read-only and not idempotent, and the description adds the specific active-to-completed state transition as well as the 'active' precondition. It does not address error behavior for already-completed or nonexistent reminders, but the annotations lower the burden and there is no contradiction.

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 no filler words; it is front-loaded with the verb and the object. The description is efficiently sized for the tool's simple purpose, though it omits some operational detail.

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?

Complexity is low and there is an output schema plus annotations, so the description does not need to explain return values. Still, it leaves open questions about how to obtain a valid reminder_id, whether inactive reminders are rejected, and what happens if the reminder is already completed — enough of a gap for a mutating tool.

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 compensate by explaining reminder_id. It does not: no format, source, validation, or relationship to list_reminders/set_reminder is provided. The schema's title 'Reminder Id' is minimal and not augmented by the description.

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 states a specific verb ('Transition') with a clear resource ('one active reminder') and target state ('completed'), so the purpose is unambiguous. It could improve by explicitly distinguishing itself from sibling tools such as set_reminder or list_reminders, but it does not merely restate the name.

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 use is implied: call it when an active reminder should be marked completed. However, there is no explicit when-to-use vs when-not-to-use guidance, no mention of alternatives, and no note about needing a reminder ID from list_reminders or set_reminder.

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