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

Annotations already flag destructiveHint=true and openWorldHint=true, so the safety profile is partly covered; the description adds the key hidden side effect — guests trigger external invitation emails, and an event with no guests notifies nobody. It stops short of saying what is returned or which calendar the event lands on by default.

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?

Three short sentences, action first, then side effects, then the video-meeting flag. No filler and nothing buried.

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 10-parameter mutating tool with no output schema, the description covers the notification side effect but omits the return value (does it hand back an event ID?) and defaults such as which calendar is used. It is adequate but leaves meaningful gaps.

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 60% and the description only elaborates on attendees and addVideoMeeting, both of which are already documented in the schema. Half the parameters (location, calendarId, description, title) get no added meaning from the description, so it does not compensate for the coverage gap.

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?

States a specific verb and resource ("Create an event"), which the name/title refine to Outlook Calendar. It could have named the relevant sibling (create_google_calendar_event) explicitly, but the purpose is unambiguous.

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?

Gives conditional behavior for guests (invitations sent vs. nobody notified) and when to set addVideoMeeting, which implies usage. It never states prerequisites (e.g., a connected mailbox) or when to prefer this over create_google_calendar_event or update_outlook_calendar_event.

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