AddCal — Claude Code MCP server: features and setup
AddCal lets an agent manage calendars and events published for subscribers. Use it to handle RSVPs, group calendars, or check event activity.
claude mcp add --transport http addcal https://addcal.co/mcpWhat AddCal 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.
What it helps with
- 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 for the agent
- 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.
How to install AddCal
Platform CLI: remote server
claude mcp add --transport http addcal https://addcal.co/mcpPlatform CLI: remote server
codex mcp add addcal --url https://addcal.co/mcpConfig file
{
"mcpServers": {
"addcal": {
"url": "https://addcal.co/mcp"
}
}
}Config file
{
"servers": {
"addcal": {
"type": "http",
"url": "https://addcal.co/mcp"
}
}
}Platform CLI: remote server
gemini mcp add -t http addcal https://addcal.co/mcpStep by step, with commands for each platform: How to add an MCP server to Claude Code, Codex, Cursor, VS Code, Gemini CLI and more
Questions about AddCal
How do I install AddCal in Claude Code?
Run claude mcp add --transport http addcal https://addcal.co/mcp, then open /mcp in Claude Code and sign in through the browser.
What does AddCal do?
It manages calendars and events published for subscribers, including event creation, RSVP handling, and analytics.
Does AddCal require an API key?
No. It authenticates with OAuth, and the connected client receives access limited to your team’s permissions.
