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jaydenk

Fantastical MCP

by jaydenk

get_events_by_calendar

Retrieve upcoming events from a specific calendar by providing the calendar name and optional days ahead (default 30).

Instructions

Get events from a specific calendar.

Args: calendar: Calendar name (e.g. "Work", "Personal"). Use get_calendars to see available names. days: Number of days to look ahead (default 30).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
calendarYes
daysNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior3/5

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

No annotations exist, so the description carries full burden. It discloses the lookahead behavior (days parameter with default 30) but does not mention sorting, timezone handling, or whether events are future-only from now. Partial transparency.

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

Conciseness4/5

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

Description is short and front-loaded with the main purpose. The Args section is helpful but slightly verbose with code block formatting. Each sentence adds value, though the formatting could be streamlined.

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

Completeness3/5

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

Output schema is present, so return structure is covered. However, missing details like pagination, maximum days allowed, error handling, or event ordering. Adequate for a simple list tool but not comprehensive.

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

Parameters4/5

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

Schema has 0% description coverage, but the description compensates by explaining calendar as a name string and days as number of days ahead with a default value. Adds meaning beyond the raw schema types.

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?

The description clearly states 'Get events from a specific calendar', identifying the verb (get) and resource (events from calendar). It distinguishes from sibling tools like get_calendars (which lists calendars) and get_events_in_range (which may not be calendar-specific).

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

Usage Guidelines3/5

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

Provides a hint to use get_calendars to find available calendar names, but does not explicitly state when to use this tool versus alternatives like get_events_in_range or get_upcoming. Usage context is implied rather than explicit.

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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