che-ical-mcp

Give Claude native control of macOS Calendar and Reminders. A Swift MCP server built directly on EventKit — 29 tools for events, reminders, tags, batch operations, conflict detection, and undo/redo. Not just calendar events: it drives Reminders and tasks too.

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Install

Claude Code — register this repo as a marketplace, then install the plugin. The plugin bundles the /today, /week, /quick-event, /remind slash commands and a PreToolUse hook that verifies day-of-week on every event write:

claude plugin marketplace add PsychQuant/che-ical-mcp
claude plugin install che-ical-mcp@che-ical-mcp

Claude Desktop — download the latest .mcpb from Releases and double-click to install.

Standalone MCP — the 29-tool server on its own, no plugin extras:

mkdir -p ~/bin
curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o ~/bin/CheICalMCP && chmod +x ~/bin/CheICalMCP
claude mcp add --scope user --transport stdio che-ical-mcp -- ~/bin/CheICalMCP

On first use, macOS prompts for Calendar and Reminders access — click Allow. Building from source, upgrading in place, or running under SSH / launchd / VS Code? See Installation for the full guide.

Why che-ical-mcp?

All 29 Tools

Installation

The quick paths live at the top of this README. This is the full reference — manual config, source builds, permission edge cases, in-place upgrades, and CLI mode.

Requirements

• macOS 14.0+ (Sonoma or later — required since v1.11.0 for the full TCC permission API)
• Xcode Command Line Tools (only if building from source)

Claude Desktop

One-click (recommended): download the latest che-ical-mcp-<version>.mcpb from Releases, double-click, and restart Claude Desktop.

Manual config: download the binary, then point claude_desktop_config.json at it.

curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o /usr/local/bin/che-ical-mcp
chmod +x /usr/local/bin/che-ical-mcp

Edit ~/Library/Application Support/Claude/claude_desktop_config.json, then restart Claude Desktop:

{
  "mcpServers": {
    "che-ical-mcp": {
      "command": "/usr/local/bin/che-ical-mcp"
    }
  }
}

Claude Code — plugin (recommended)

claude plugin marketplace add PsychQuant/che-ical-mcp
claude plugin install che-ical-mcp@che-ical-mcp

• Inside Claude Code, the slash equivalents /plugin marketplace add PsychQuant/che-ical-mcp and /plugin install che-ical-mcp@che-ical-mcp work the same way.
• Add the marketplace through its Git repo (owner/repo), not a raw marketplace.json URL — the plugin source is a same-repo relative path (./plugin) that only resolves when added via Git.
• Also bundled in the psychquant-claude-plugins aggregator (claude plugin install che-ical-mcp@psychquant-claude-plugins); both serve the same versioned binary.
• The wrapper auto-downloads the binary to ~/bin/CheICalMCP on first use if it isn't already there.

Claude Code — standalone MCP

mkdir -p ~/bin

# If upgrading, remove the old binary first. On macOS 26 the kernel can kill a
# fresh binary that inherits a stale code-signature cache from the old inode —
# one a running MCP process may still be holding open.
rm -f ~/bin/CheICalMCP

curl -L https://github.com/PsychQuant/che-ical-mcp/releases/latest/download/CheICalMCP -o ~/bin/CheICalMCP
chmod +x ~/bin/CheICalMCP

# --scope user: available in all projects  ·  --transport stdio: local stdin/stdout
claude mcp add --scope user --transport stdio che-ical-mcp -- ~/bin/CheICalMCP

💡 Tip: Keep the binary in a local directory like ~/bin/. Cloud-synced folders (Dropbox, iCloud, OneDrive) can trigger MCP connection timeouts when sync touches the file.

Build from Source (optional)

git clone https://github.com/PsychQuant/che-ical-mcp.git
cd che-ical-mcp
make release && make install
claude mcp add --scope user --transport stdio che-ical-mcp -- ~/bin/CheICalMCP

⚠️ Swift 6 / Xcode 18 users: Don't run swift build directly — the upstream MCP SDK has a concurrency error (swift-sdk#214). The Makefile auto-detects this and falls back to Swift 5 language mode.