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

No annotations are provided, so the description carries the full burden of behavioral disclosure. It identifies the operation as creating a calendar, but it does not mention the response/return value, duplicate-name behavior, permissions required, or any side effects beyond creation. This is minimal transparency for a mutating tool.

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 a single front-loaded sentence with no filler. It states the core action first, then adds a relevant use case. Every word earns its place.

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 two-parameter create tool, the description is adequate but not complete. It leaves gaps around name parameter semantics and the result of the operation. An agent can likely infer how to call it, but not what to expect back or how name collisions are handled.

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 only 50%. The mailbox parameter is documented in the schema, including a pointer to list_authorized_mailboxes, but the name parameter has no description. The tool description does not compensate by explaining the expected format or meaning of name, so one parameter remains semantically under-specified.

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 states the action ('Create a new calendar on the account') and explains the practical purpose ('keeping a client's or project's events separate from the default one'). It identifies the resource as a calendar, distinguishing it from event-creation siblings like create_outlook_calendar_event, though it does not explicitly name the alternative.

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 provides a clear use case: separate a client's or project's events from the default calendar. This implies when the tool should be used, but it does not state exclusions or point to alternatives such as creating calendar events or listing calendars.

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