create_calendar_event

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

With no annotations, the description must fully disclose behavior, but it only states 'Creates an event.' It does not explain whether the tool opens a dialog, saves immediately, requires Mac Calendar to be running, or what default values are used. Behavioral traits are completely opaque.

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?

The description is very short (one sentence), which is concise but at the cost of important details. It front-loads the core action but fails to earn its place by omitting critical usage and behavior information.

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?

Given zero parameters, no output schema, and missing annotations, the description is severely incomplete. It does not explain what happens when the tool is invoked (e.g., creates a blank event, requires user input, or returns an object) or any return value.

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?

The input schema has no parameters, so schema coverage is 100% trivially. The description adds no parameter information because none exist. Baseline score 3 is appropriate as the description provides no additional meaning.

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 clearly identifies the tool as creating an event in the Mac's Calendar app, distinguishing it from other calendar tools like m365_create_event and update_calendar_event. However, the lack of parameters leaves ambiguity about what kind of event is created (e.g., blank, default, or based on context).

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?

No guidance is provided on when to use this tool versus alternatives (e.g., m365_create_event for Outlook). There are no preconditions or exclusions mentioned, leaving the agent without context for appropriate use.

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