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list_calendar_names

Retrieve all calendar names from macOS Calendar to enable AI agents to access schedules and manage events on your Mac.

Instructions

List available calendars

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Implementation Reference

  • server.js:82-86 (registration)
    Tool registration in a loop - registers list_calendar_names (and all other tools) with the MCP server using server.tool()
    for (const [name, desc] of TOOLS) {
      server.tool(name, desc, {}, async () => ({
        content: [{ type: "text", text: "This is an inspection stub. Install Pilot MCP on macOS: npx -y local-mcp@latest setup" }],
      }));
    }
  • TOOLS array containing tool names and descriptions - list_calendar_names is defined here with its description
    const TOOLS = [
      ["list_emails", "List emails from Mail.app inbox with optional filters"],
      ["read_email", "Read full email content by ID"],
      ["search_emails", "Search emails by keyword, sender, or date range"],
      ["send_email", "Compose and send a new email"],
      ["reply_email", "Reply to an existing email"],
      ["move_email", "Move email to a different mailbox"],
      ["save_attachment", "Save email attachment to disk"],
      ["list_calendar_names", "List available calendars"],
      ["list_calendar_events", "List calendar events for a date range"],
      ["create_calendar_event", "Create a new calendar event"],
      ["delete_calendar_event", "Delete a calendar event with preview"],
      ["list_reminders", "List reminders from a specific list"],
      ["list_reminder_lists", "List all reminder lists"],
      ["create_reminder", "Create a new reminder"],
      ["complete_reminder", "Mark a reminder as complete"],
      ["list_contacts", "List contacts from the address book"],
      ["search_contacts", "Search contacts by name, email, or phone"],
      ["get_contact", "Get full contact details by name"],
      ["list_notes", "List notes from Apple Notes"],
      ["read_note", "Read full note content"],
      ["create_note", "Create a new note in Apple Notes"],
      ["search_notes", "Search notes by keyword"],
      ["list_message_chats", "List recent iMessage conversations"],
      ["read_messages", "Read messages from a conversation"],
      ["search_messages", "Search iMessages by keyword"],
      ["list_omnifocus_tasks", "List tasks from OmniFocus"],
      ["list_omnifocus_projects", "List OmniFocus projects"],
      ["create_omnifocus_task", "Create a new task in OmniFocus"],
      ["complete_omnifocus_task", "Mark an OmniFocus task complete"],
      ["search_omnifocus_tasks", "Search OmniFocus tasks"],
      ["list_omnifocus_tags", "List OmniFocus tags"],
      ["outlook_list_emails", "List emails from Microsoft Outlook"],
      ["outlook_read_email", "Read an Outlook email"],
      ["outlook_search_emails", "Search Outlook emails"],
      ["outlook_send_email", "Send email via Outlook"],
      ["outlook_list_events", "List Outlook calendar events"],
      ["outlook_create_event", "Create Outlook calendar event"],
      ["onedrive_list_files", "List files and folders in OneDrive"],
      ["onedrive_read_file", "Read file content from OneDrive"],
      ["onedrive_search_files", "Search files in OneDrive"],
      ["onedrive_write_file", "Write or upload file to OneDrive"],
      ["onedrive_delete_file", "Delete file from OneDrive"],
      ["onedrive_move_file", "Move or rename file in OneDrive"],
      ["finder_list", "List files in a Finder directory"],
      ["finder_search", "Search files using Spotlight"],
      ["pdf_read", "Read text content from a PDF file"],
      ["word_read", "Read content from a Word document"],
      ["word_create", "Create a new Word document"],
      ["word_append", "Append content to a Word document"],
      ["excel_read", "Read data from an Excel spreadsheet"],
      ["excel_create", "Create a new Excel spreadsheet"],
      ["excel_write_cell", "Write data to Excel cells"],
      ["ppt_read", "Read content from a PowerPoint file"],
      ["ppt_create", "Create a new PowerPoint presentation"],
      ["teams_list_chats", "List Microsoft Teams chat conversations"],
      ["teams_read_chat_messages", "Read messages from a Teams chat"],
      ["teams_list_teams", "List Teams and their channels"],
      ["teams_list_channels", "List channels in a Teams team"],
      ["teams_read_channel_messages", "Read messages from a Teams channel"],
      ["list_safari_bookmarks", "List Safari bookmarks"],
      ["list_accounts", "List configured email and calendar accounts"],
      ["create_email_folder", "Create a new email folder/mailbox"],
      ["diagnose", "Run diagnostic checks on all connected services"],
      ["report_bug", "Report a bug or issue to the development team"],
      ["request_feature", "Request a new feature"],
      ["request_integration", "Request integration with an unsupported app"],
    ];
  • server.js:83-85 (handler)
    Handler function for all tools including list_calendar_names - returns stub message since this is an inspection-only server
    server.tool(name, desc, {}, async () => ({
      content: [{ type: "text", text: "This is an inspection stub. Install Pilot MCP on macOS: npx -y local-mcp@latest setup" }],
    }));
Behavior2/5

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

No annotations provided, so description carries full burden, yet discloses nothing about behavior. Does not explain what 'available' entails (permissions, visibility), return format (strings vs objects), pagination, or potential rate limits.

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?

Extremely concise at three words. Every word serves a purpose. No filler or redundancy. Front-loaded with the action verb.

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?

Minimum viable for a zero-parameter tool, but gaps remain. Without an output schema, the description should indicate what the tool returns (e.g., 'Returns list of calendar names/IDs') to enable correct downstream use with 'create_calendar_event'.

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?

Input schema has zero parameters. Per evaluation rules, zero-parameter tools receive a baseline score of 4 since no parameter documentation is required.

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?

States a clear verb-resource pair ('List available calendars') that distinguishes from sibling 'list_calendar_events' by targeting calendar containers rather than events. However, 'available' is vague (user calendars? subscribed? shared?) and it doesn't specify whether it returns names, IDs, or full objects.

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?

Provides no guidance on when to use this tool versus alternatives, nor prerequisites. Fails to mention that output is likely needed as input for 'create_calendar_event' or that 'list_calendar_events' should be used when seeking events rather than calendar metadata.

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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