About Klass Personal OS
Klass Personal OS is a Mac app that runs Claude or Codex on a schedule or when mail, messages, feed items, or files arrive. It is for people automating work across personal data, with separate access keys and scopes for each assistant.
Key features
- 01Run automations on schedules or events
- 02Connect mail, calendars, and folders
- 03Assign separate scoped keys to assistants
- 04Control writing, deletion, and remote commands
- 05Connect Claude Desktop, Claude Code, and Codex
Use cases
- 01Handle mail and calendar tasks on a schedule
- 02Start work when new mail or files arrive
- 03Limit assistant access to selected accounts and folders
- 04Connect local data through an MCP client
MCP support
The app includes an MCP server and provides an extension for Claude Desktop, along with configuration for other MCP clients. Each assistant uses a separate key scoped to specified accounts, folders, and actions.
Configuration
Local server config is the same for every client. Copy it into your client’s MCP config file.
We haven’t collected a package or remote endpoint for this server. Follow the instructions in the project README.
Tools
Local servers expose tools only once running on your machine, and the maintainer has not provided a tool list.
Details
From the project READMEKlass Personal OS
A native Mac app that runs Claude or Codex on a schedule, or the moment an email, text message, feed item, or file arrives, so the work happens whether or not a chat is open. Each assistant gets its own API key, scoped to the mail accounts, folders, calendars, and actions you choose.
Website and download: https://coreyklass.com/personal-os
mcp-name: io.github.KlassyCoder/klass-personal-os
What this repository is
This is the public distribution point for Klass Personal OS's MCP connector. The app itself is closed source and is downloaded from the website above. This repository holds:
- Releases: the Claude Desktop extension (
.mcpb), a small signed and notarized bridge that connects Claude Desktop to the app's local MCP server. server.json: the listing for the official MCP Registry.
The extension does nothing without the app. Install the app first.
Getting started
- Download Klass Personal OS from https://coreyklass.com/personal-os and drag it to Applications. It needs macOS 14 Sonoma or later. No account, Node, or Python is required.
- Connect your mail, calendar, and the folders it may use in the app's settings window.
- Connect an AI client:
- Claude Desktop: the app's Claude Desktop settings have an Install Extension button. You can also download the
.mcpbfrom this repository's Releases and open it. Claude Desktop asks for an API key (issue one under API Keys in the app) and the app's MCP port. - Claude Code and other MCP clients: issue a key under API Keys and use Copy Claude Config to get a config to paste.
- Codex: the app's Codex settings have a Copy Manual MCP Template button.
- Claude Desktop: the app's Claude Desktop settings have an Install Extension button. You can also download the
Automations run the Claude Code or Codex CLI already installed on your Mac, with its own sign-in.
Security model
- Each assistant gets its own key, limited to the accounts, folders, and actions you name. Revoking one key never touches the others.
- Writing to mail, permanent deletes, and remote commands are each off until you turn them on, and an outbound mail account can hold every send for your approval.
- Synced mail and calendar data stay on your Mac, and passwords stay in the macOS Keychain.
- The MCP server listens only on your Mac unless you change that setting.
- No telemetry or analytics. The only call the app makes on its own is a once-daily update check you can turn off.
- The App Sandbox is off, because a sandboxed app can't launch the Claude or Codex CLI, and launching them on a schedule is the point of the app.
Full details: https://coreyklass.com/personal-os/security.html
Pricing
The free tier works against your real accounts, includes three automations, and has no time limit. Pro is a one-time license that raises the limits and adds a few tools. See https://coreyklass.com/personal-os for current pricing.
Support
Email [email protected]. Release notes: https://coreyklass.com/personal-os/release-notes.html
Copyright Klass Concepts LLC. All rights reserved.
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An open protocol that defines how AI applications connect to external tools and data in a uniform way. Clients talk to the model; MCP servers provide tools, resources and prompt templates. They exchange standard messages, so one server can be reused by many clients.