"A simple MCP server or implementation" matching MCP servers:

A Model Context Protocol (MCP) server that provides tools for interacting with simple's data, including customer reports, calendar events, and company information.

A Model Context Protocol (MCP) server for accessing Fathom AI API endpoints (meetings, recordings, transcripts, summaries, teams, team members) via GET operations.

Enables AI assistants to interact with Microsoft 365 and Office services through the Microsoft Graph API, providing tools for email, calendar, files, Teams, SharePoint, and more with configurable permissions and output formats.

A self-hosted MCP server that exposes Nextcloud files, calendar, notes, and search as tools for Claude.ai, authenticating via Nextcloud OAuth.

MCP server for the Shiftyasan public solver API, letting AI agents validate and solve shift-scheduling problems, with async job polling for large cases.

MCP server that wraps the AddEvent Calendar & Events API v2, allowing Claude to create, search, retrieve, update, and delete events, calendars, and RSVP attendees, plus list timezones.

Enables AI assistants to discover and book local service businesses like barbers, plumbers, and mechanics directly through MCP-compatible tools.

Provides Japanese business day calculations: add or subtract business days, count between dates, check whether a date is a business day, and reverse-calculate deadlines. Handles national holidays and year-end periods fully offline with no API keys required.

Enables agents to interact with a clinic booking API, including listing specialties, doctors, and a patient's appointments, and booking or cancelling appointments when the active profile permits, while preserving the caller's authority and screening tool descriptions for safety.

Enables full CRUD operations on calendar events, free/busy queries, and availability slot finding via CalDAV, supporting Nextcloud, Radicale, iCloud, and other RFC 4791-compliant servers.

Enables Claude (or any MCP client) to read and write events on your iCloud calendars via CalDAV.

MCP server for the eRezo API that enables managing professional contacts and events directly from Claude, including listing, creating, updating, and deleting contacts, as well as event registration.

Enables MCP-compatible clients to manage Reclaim.ai tasks, including listing, creating, updating, completing, deleting, and timer operations through natural language.

MCP server for Google Workspace APIs - Docs, Sheets, Drive, Gmail, and Calendar. Enables reading, creating, and editing Google Docs and Sheets, managing comments, reading emails, and viewing calendar events.

A local MCP server that lets Claude read macOS Mail.app via JXA, with tools for listing accounts/mailboxes, searching and reading messages. Read-only by default, with optional opt-in write tools for compose drafts and Apple Calendar events.

Enables MCP clients to access Stardew Valley calendar data, including current date, daily events, villager birthdays, weekly birthdays, and full seasonal calendars, through a local HTTP bridge to the HelloStardew mod. It provides read-only tools with structured success or error responses for natural-language use.

Enables interaction with Outlook Web through its internal API, supporting email search, folder listing, email retrieval, read state changes, calendar events, and reply drafts without Microsoft Graph or COM.

Official local MCP server for Garoon, enabling AI assistants to interact with the Garoon groupware platform through tools like schedule retrieval and user management.

Enables AI agents to manage Meetergo calendars by finding slots, booking, rescheduling, and canceling appointments.

Enables LLM agents to query current time, DST schedules, timezone conversions, working hour overlaps, and meeting time suggestions across locations via the production findtime.io Time API, including natural-language time questions and location resolution.