cancel_reminder

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

Annotations already declare idempotent=true, destructive=false, readOnly=false and openWorld=false, so the safety profile is largely covered. The description usefully adds side-effect scoping ('without changing other notifications') and the pending-state precondition, but says nothing about behavior when the id is unknown or the reminder already fired.

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 well-formed sentence with the action, target, key, and side-effect boundary all front-loaded. No filler, nothing to trim.

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 one-parameter mutation with full annotation coverage and no output schema, the description covers target, key, precondition and non-interference. Only minor gaps remain: source of the id and outcome on unknown/completed reminders.

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 0% for the single reminder_id property, so the description is the only source of meaning. 'By id' confirms the parameter is an identifier lookup, but it gives no format, no hint about where ids come from (presumably list_reminders), and no behavior for invalid ids.

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 gives a specific verb (cancel) and resource (pending personal reminder) plus the keying parameter (id). It implicitly separates itself from create_reminder, list_reminders, and the notification siblings by scoping the target to 'personal reminder' and disclaiming other notifications, though it never names a sibling explicitly.

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 word 'pending' signals the applicable state (only un-fired reminders), which is genuine usage context. But there is no explicit when-not guidance, no mention of what to do for already-delivered reminders, and no routing to alternatives such as snooze_notifications or dismiss_notification.

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