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jaydenk

Fantastical MCP

by jaydenk

get_upcoming

Retrieve calendar events for the upcoming days, grouped by date. Specify the number of days to look ahead.

Instructions

Get calendar events for the next N days, grouped by date.

Args: days: Number of days to look ahead (default 7).

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
daysNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

With no annotations, the description must disclose behavioral traits, but it only states the basic function. It does not mention read-only nature, permissions, rate limits, or any side effects, leaving significant gaps for a simple read operation.

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

Conciseness5/5

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

The description is extremely concise, with a clear front-loaded statement of purpose and a brief parameter explanation. Every sentence is essential and there is no redundancy.

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

Completeness4/5

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

Given the tool's simplicity, the existence of an output schema, and only one optional parameter, the description covers the main functionality. It lacks behavioral context but is mostly complete for a straightforward get operation.

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?

The single parameter 'days' has schema coverage 0%, and the description adds the phrase 'look ahead' and repeats the default, providing minimal extra meaning. But it does not specify valid range or behavior for edge cases.

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

Purpose5/5

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

The description clearly states the action ('Get'), resource ('calendar events'), scope ('next N days'), and output format ('grouped by date'), distinguishing it from siblings like 'get_upcoming_json' and 'get_recent'.

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 is provided on when to use this tool versus alternatives (e.g., get_upcoming_json, get_today). The description does not include any conditional or contextual recommendations.

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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