# AddCal

AddCal lets an agent manage calendars and events published for subscribers. Use it to handle RSVPs, group calendars, or check event activity.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI · ★ 1
- Author: addcal
- License: MIT · policy=link-only · description only; the file stays with the author
- Source: https://github.com/addcal/mcp
- Updated: 2026-08-14
- HTML: https://affpapa.org/en/nevibecode/mcp/addcal

## What it does

AddCal connects to public calendars rather than managing your personal schedule. Its tools can create and edit events, group calendars into collections, inspect subscribers and RSVPs, and retrieve analytics. For recurring events, `preview-recurring-dates` lets you check the resulting dates before creating a series.

The hosted server uses HTTP and OAuth, so there is no API key to paste into your client. In Claude Code, run `claude mcp add --transport http addcal https://addcal.co/mcp`, then open `/mcp` to sign in. Some actions need explicit confirmation: deleting an event, sending an invite, and creating an RSVP. Removing a recurring event deletes the full series, so check the target before confirming. Subscriber names and email addresses are available only when a calendar collects those details.

## Requirements
- Remote server: `https://addcal.co/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http addcal https://addcal.co/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add addcal --url https://addcal.co/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "addcal": {
            "url": "https://addcal.co/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "addcal": {
            "type": "http",
            "url": "https://addcal.co/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http addcal https://addcal.co/mcp
```

## When to use it
- publish an event to a public calendar
- group calendars into a collection
- check responses to an event RSVP
- inspect a calendar’s subscribers
- compare events by add-to-calendar activity

## Example prompts
- Create a public event on the team calendar and show me the dates first.
- Find the subscribers for this calendar and check their RSVP responses.
- Compare events by add-to-calendar activity for the selected date range.

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md