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mathewcsims

mail-calendar-mcp

by mathewcsims

calendar_rename_calendar

Idempotent

Rename an existing calendar. Provide the new name; optionally identify the calendar by name or index to handle duplicates.

Instructions

Rename an existing calendar.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
newNameYes
calendarNameNoCalendar name. Ambiguous if duplicated (common on multi-account setups) — use calendarIndex instead in that case.
calendarIndexNoPosition from calendar_list_calendars, for disambiguating duplicate calendar names. Stable only for the current Calendar.app process.
Behavior2/5

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

Annotations already indicate mutation (readOnlyHint=false), idempotence (idempotentHint=true), and non-destructiveness (destructiveHint=false). The description adds no behavioral context beyond the bare verb 'rename', missing details like whether the name change is immediate or requires confirmation.

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?

A single sentence with no redundancy, though it could be slightly expanded for completeness 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?

For a mutation tool with no output schema and sparse description, it omits important context: prerequisite (calendar must exist), error conditions, and whether renaming affects events or sharing settings.

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 coverage is 67% with descriptions for 'calendarName' and 'calendarIndex', but 'newName' lacks description. The tool description adds no parameter info, so it meets the baseline for adequate schema coverage.

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 'Rename an existing calendar' clearly states the action and the resource, distinguishing it from siblings like 'calendar_create_calendar' and 'calendar_delete_calendar'.

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 versus alternatives, no prerequisites mentioned (e.g., calendar must exist), and no context on 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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