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owen-nash

Fastmail MCP Server

by owen-nash

create_calendar_event

Create a calendar event in Fastmail with required title and start/end times, plus optional description, location, and participants.

Instructions

Create a new calendar event

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
calendarIdYesID of the calendar to create the event in
titleYesEvent title
descriptionNoEvent description (optional)
startYesStart time in ISO 8601 format
endYesEnd time in ISO 8601 format
locationNoEvent location (optional)
participantsNoEvent participants (optional)
Behavior2/5

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

No annotations provided, so description carries full burden. Only says 'Create', implying mutation, but no details on permissions, side effects, or restrictions like time zone handling or participant limits.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Extremely brief (one sentence), but this sacrifices necessary detail for a tool with 7 parameters. Could be more informative without losing conciseness.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness2/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

No output schema, and description omits return values, error conditions, or confirmation. Lacks completeness for a creation tool with nested parameters.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters3/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema has 100% description coverage, so description adds no extra meaning beyond what schema already provides. Baseline 3 without additional insights.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose4/5

Does the description clearly state what the tool does and how it differs from similar tools?

Clearly states it creates a calendar event with verb+resource, but does not differentiate from siblings like get_calendar_event or list_calendar_events.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines2/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance on when to use this tool vs alternatives. No context about prerequisites or when not to use it.

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

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