apple_calendar_create_calendar

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

Annotations already declare this is a write, non-destructive, non-idempotent, open-world operation. The description adds genuinely useful context beyond that - the calendar is placed in the 'app default account' rather than a caller-specified one, which matters since no account parameter exists. It still omits duplicate-name handling and permission requirements, so it does not exceed a 3.

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 front-loaded sentence with no wasted words. Appropriate length for a simple two-parameter create tool, though it is terse enough that it could have used its remaining room to cover parameters.

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 simple create tool with annotations covering the safety profile, the description is minimally adequate but leaves parameter semantics and the account/return behavior largely unstated, with no output schema to fill the gap. It is sufficient to invoke, not to invoke confidently.

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% and the description never mentions the 'name' or 'description' parameters. The intuitive field names partially rescue it, but the description fails to compensate for the documented gap, and the 10000-char description default is left unexplained.

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 (Create) and resource (Calendar.app calendar) plus the target account context, which distinguishes it from siblings like create_event, delete_calendar, or rename_calendar. It does not explicitly name a sibling to differentiate from, so it stops short of a 5.

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 description offers no when-to-use guidance, no prerequisites, and no comparison to alternatives such as list_calendars or rename_calendar. Usage is only implied by the verb 'Create'.

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