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

The description adds substantial behavior beyond the annotations: members see the event immediately, calls are confirmed by default, confirmation can be disabled for this tool, Skool reminds members before the event, and creation awaits owner approval. These are meaningful side-effect and workflow details for a mutation tool, and they do not contradict the annotations.

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 front-loaded with the core purpose and stays reasonably compact. Some phrasing is repetitive or potentially ambiguous, such as 'as Add event does,' but overall it is well structured and not bloated.

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 an 11-parameter creation tool with no output schema, the description covers the important operational context: admin restriction, one-time event behavior, visibility, reminders, confirmation, and approval. It could be more complete on the return or pending-approval behavior, but the core selection and invocation context is present.

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 description names the main concepts such as title, start, length, time zone, location, and visibility, but the input schema already documents all 11 parameters at 100% coverage. It adds little parameter-level detail beyond what the schema already provides, so the baseline of 3 is appropriate.

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 and resource: adding an event to a group's calendar, with admin-only and one-time scope. It is clearly a creation tool rather than an update or listing tool, but it does not explicitly differentiate itself from nearby siblings such as update_event or list_events.

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?

It states the key usage constraint that the caller must be an admin and that this creates a one-time calendar event. That gives clear context for selecting the tool, but it does not explicitly say when to use this versus update_event, list_events, or other sibling tools.

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