AddCal

Publish public calendars and events others subscribe to: RSVPs, feeds and add-to-calendar links.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Remote HTTP

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "addcal-2": {
      "url": "https://smithery.ai/badge/hello-ub6m/addcal-calendar-links)](https://smithery.ai/servers/hello-ub6m/addcal-calendar-links"
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (19)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by AddCal.

search

query*`, `limit`, `team_id

list-calendars

search`, `limit`, `team_id

create-calendar

name*`, `description`, `timezone`, `team_id

list-calendar-collections

team_id

create-calendar-collection

name*`, `calendar_ids*`, `description`, `allow_subscriber_selection`, `team_id

list-subscribers

calendar_id*`, `status`, `search`, `limit

Documentation Overview

AddCal MCP Server

A remote Model Context Protocol server for AddCal. Connect Claude, ChatGPT, Cursor or any MCP client and manage the calendars other people subscribe to.

Code

https://addcal.co/mcp

No install, no API key. It is a hosted streamable HTTP server and authentication is OAuth.

This is not a Google Calendar MCP

Almost every calendar MCP server does the same job: it reads and writes your own schedule. Useful, and well covered already.

AddCal is the other side of the calendar. It manages the events you publish for an audience: a class timetable, a fixture list, a release schedule, a conference programme. The people receiving those events never get an invite. They subscribe to a feed, or they click an add-to-calendar link, and the event lands in whichever calendar app they already use.

That difference shows up in the tools. There is no accept-invite, because nobody is invited. There is list-subscribers, get-analytics and create-calendar-collection, because the questions you ask about a published calendar are how many people follow it and whether anyone actually added the event.

Use a Google Calendar MCP to run your day. Use this one to run a calendar other people follow.

Quick start

Pick your client. Cursor and VS Code install in one click.

Claude Code

Terminal

claude mcp add --transport http addcal https://addcal.co/mcp

Then run /mcp inside Claude Code to sign in.

Claude Desktop and claude.ai

Settings, Connectors, Add custom connector, then paste https://addcal.co/mcp. Custom connectors need a paid plan.

ChatGPT

Settings, Apps & Connectors, Advanced, turn on Developer mode, then add https://addcal.co/mcp as a connector. Requires a paid plan on the web app.

Anything else

Any client that speaks streamable HTTP with OAuth. Windsurf, Goose, Zed and the JetBrains AI Assistant all take a remote MCP URL.

config.json

{
  "mcpServers": {
    "addcal": {
      "type": "http",
      "url": "https://addcal.co/mcp"
    }
  }
}

Authentication

OAuth 2.1 with PKCE and dynamic client registration. There is no API key to copy and paste.

Your client registers itself, you approve it in a browser, and it receives a token scoped to your team. It can reach exactly what you can reach, no more. Revoke any connected client from Settings, API.

What you can ask for

Code

What have I got on next week?
Create a team standup every weekday at 9am and show me the dates first.
Who has RSVPed yes to the launch party?
Duplicate last month's workshop into March.
Which of my events got the most add-to-calendar clicks?

Tools

19 tools. RO is read only. Required parameters are marked *.

Search

Tool		Parameters
`search`	RO	`query*`, `limit`, `team_id`

One call across calendars, collections, events and RSVPs, returning the ids every other tool needs. Start here whenever something is named rather than identified.

Calendars

Tool		Parameters
`list-calendars`	RO	`search`, `limit`, `team_id`
`create-calendar`		`name*`, `description`, `timezone`, `team_id`

Collections

A collection bundles several calendars behind one public page and subscribe link.

Tool		Parameters
`list-calendar-collections`	RO	`team_id`
`create-calendar-collection`		`name`, `calendar_ids`, `description`, `allow_subscriber_selection`, `team_id`

Subscribers

Tool		Parameters
`list-subscribers`	RO	`calendar_id*`, `status`, `search`, `limit`

Returns personal data. Names and emails exist only for calendars that ask subscribers for details, so many rows are anonymous.

Events

Tool		Parameters
`list-events`	RO	`calendar_id`, `search`, `range`, `start_date`, `end_date`, `limit`, `team_id`
`get-event`	RO	`event_id*`
`create-event`		`calendar_id`, `title`, `date_start`, `date_end`, `timezone`, `description`, `location`, `is_all_day`, `is_draft`, `has_rsvp`, `recurrence_rule`, `series_title`, `reminder_before`
`update-event`		`event_id*`, `title`, `description`, `location`, `date_start`, `date_end`, `timezone`, `is_all_day`, `is_draft`, `has_rsvp`, `recurrence_rule`, `reminder_before`
`duplicate-event`		`event_id*`, `target_calendar_id`, `title`, `date_start`, `date_end`
`delete-event`	destructive	`event_id`, `confirm`, `notify_invitees`
`preview-recurring-dates`	RO	`recurrence_rule`, `date_start`, `date_end*`, `timezone`, `is_all_day`, `count`

Recurrence uses RFC 5545 rules without the RRULE: prefix, such as FREQ=WEEKLY;BYDAY=MO;COUNT=10. Run preview-recurring-dates before creating a series to check the dates land where you expect.

RSVPs

Tool		Parameters
`list-rsvps`	RO	`event_id*`, `response_type`, `search`, `limit`
`create-rsvp`	destructive	`event_id`, `name`, `email`, `response_type`, `confirm*`, `custom_fields`, `send_confirmation`

create-rsvp emails the attendee by default. Set send_confirmation to false to record an RSVP silently.

Invites

Tool		Parameters
`list-invites`	RO	`event_id*`, `status`, `search`, `limit`
`send-event-invite`	destructive	`event_id`, `email`, `confirm*`

Account

Tool		Parameters
`get-analytics`	RO	`calendar_id`, `event_id`, `start_date`, `end_date`, `timezone`, `unique_only`, `include_series`, `team_id`
`get-team-usage`	RO	`team_id`

Destructive tools

Three tools are annotated destructive, and all three require an explicit confirm parameter:

send-event-invite and create-rsvp email a real person. That cannot be recalled.
delete-event is permanent, and deleting a recurring event removes every instance in the series.

A well-behaved client surfaces these for approval before running them. Check the name and address when your assistant asks.

Plans and limits

The server is included on every plan, and the tools respect whatever your plan already allows. Collections, calendar invites and analytics stay gated to the plans that include them. When a tool hits a limit it explains why rather than retrying.

About this repository

AddCal's MCP server is hosted, so there is nothing here to install or run. This repository holds the published server.json manifest and the documentation for the remote endpoint. The implementation lives in the main AddCal application.

Found a problem with a tool, or want one that does not exist yet? Open an issue.

Related MCP Servers

View all in Developer Tools View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about AddCal

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "addcal": { "command": "npx", "args": ["-y", "AddCal"] } }

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Technical Specs & Signals

CategoryDeveloper Tools

52Quality signal: Good · 52/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity4/15

Community engagement0/10

A guidance signal from public completeness & health data — not a user rating. New listings start lower and rise as they add docs, get verified, and grow adoption. Signals we can't observe for a listing are skipped, not counted against it.

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This directory is pre-filled from public sources. Claim via GitHub README, site badge, or DNS TXT to unlock edit access and the Official badge — proof is checked automatically, then reviewed by our team.

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Explore more

More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to AddCal →Install in Claude Desktop Install in Cursor Install in VS Code

AddCal

Publish public calendars and events others subscribe to: RSVPs, feeds and add-to-calendar links.

Quick Install

Automated & IDE Setup

Copy the AI prompt to install this server into Claude Code, Cursor, or another agent — or use 1-click editor setup below.

Add to Cursor Add to VS Code

Manual Client & Custom JSON ConfigExpand JSON ▾

Client Config & Setup

Remote HTTP

Choose your client or environment

Target File:~/Library/Application Support/Claude/claude_desktop_config.json

claude_desktop_config.json

{
  "mcpServers": {
    "addcal-2": {
      "url": "https://smithery.ai/badge/hello-ub6m/addcal-calendar-links)](https://smithery.ai/servers/hello-ub6m/addcal-calendar-links"
    }
  }
}

💡 Paste the JSON block into your client's configuration file under mcpServers, then restart the application.

Capabilities & Tool Schemas (19)Self-reported

Inspect callable tools, capabilities, and parameters exposed to AI agents by AddCal.

search

query*`, `limit`, `team_id

list-calendars

search`, `limit`, `team_id

create-calendar

name*`, `description`, `timezone`, `team_id

list-calendar-collections

team_id

create-calendar-collection

name*`, `calendar_ids*`, `description`, `allow_subscriber_selection`, `team_id

list-subscribers

calendar_id*`, `status`, `search`, `limit

Documentation Overview

AddCal MCP Server

A remote Model Context Protocol server for AddCal. Connect Claude, ChatGPT, Cursor or any MCP client and manage the calendars other people subscribe to.

Code

https://addcal.co/mcp

No install, no API key. It is a hosted streamable HTTP server and authentication is OAuth.

This is not a Google Calendar MCP

Almost every calendar MCP server does the same job: it reads and writes your own schedule. Useful, and well covered already.

Use a Google Calendar MCP to run your day. Use this one to run a calendar other people follow.

Quick start

Pick your client. Cursor and VS Code install in one click.

Claude Code

Terminal

claude mcp add --transport http addcal https://addcal.co/mcp

Then run /mcp inside Claude Code to sign in.

Claude Desktop and claude.ai

Settings, Connectors, Add custom connector, then paste https://addcal.co/mcp. Custom connectors need a paid plan.

ChatGPT

Settings, Apps & Connectors, Advanced, turn on Developer mode, then add https://addcal.co/mcp as a connector. Requires a paid plan on the web app.

Anything else

Any client that speaks streamable HTTP with OAuth. Windsurf, Goose, Zed and the JetBrains AI Assistant all take a remote MCP URL.

config.json

{
  "mcpServers": {
    "addcal": {
      "type": "http",
      "url": "https://addcal.co/mcp"
    }
  }
}

Authentication

OAuth 2.1 with PKCE and dynamic client registration. There is no API key to copy and paste.

What you can ask for

Code

What have I got on next week?
Create a team standup every weekday at 9am and show me the dates first.
Who has RSVPed yes to the launch party?
Duplicate last month's workshop into March.
Which of my events got the most add-to-calendar clicks?

Tools

19 tools. RO is read only. Required parameters are marked *.

Search

Tool		Parameters
`search`	RO	`query*`, `limit`, `team_id`

One call across calendars, collections, events and RSVPs, returning the ids every other tool needs. Start here whenever something is named rather than identified.

Calendars

Tool		Parameters
`list-calendars`	RO	`search`, `limit`, `team_id`
`create-calendar`		`name*`, `description`, `timezone`, `team_id`

Collections

A collection bundles several calendars behind one public page and subscribe link.

Tool		Parameters
`list-calendar-collections`	RO	`team_id`
`create-calendar-collection`		`name`, `calendar_ids`, `description`, `allow_subscriber_selection`, `team_id`

Subscribers

Tool		Parameters
`list-subscribers`	RO	`calendar_id*`, `status`, `search`, `limit`

Returns personal data. Names and emails exist only for calendars that ask subscribers for details, so many rows are anonymous.

Events

Tool		Parameters
`list-events`	RO	`calendar_id`, `search`, `range`, `start_date`, `end_date`, `limit`, `team_id`
`get-event`	RO	`event_id*`
`create-event`		`calendar_id`, `title`, `date_start`, `date_end`, `timezone`, `description`, `location`, `is_all_day`, `is_draft`, `has_rsvp`, `recurrence_rule`, `series_title`, `reminder_before`
`update-event`		`event_id*`, `title`, `description`, `location`, `date_start`, `date_end`, `timezone`, `is_all_day`, `is_draft`, `has_rsvp`, `recurrence_rule`, `reminder_before`
`duplicate-event`		`event_id*`, `target_calendar_id`, `title`, `date_start`, `date_end`
`delete-event`	destructive	`event_id`, `confirm`, `notify_invitees`
`preview-recurring-dates`	RO	`recurrence_rule`, `date_start`, `date_end*`, `timezone`, `is_all_day`, `count`

Recurrence uses RFC 5545 rules without the RRULE: prefix, such as FREQ=WEEKLY;BYDAY=MO;COUNT=10. Run preview-recurring-dates before creating a series to check the dates land where you expect.

RSVPs

Tool		Parameters
`list-rsvps`	RO	`event_id*`, `response_type`, `search`, `limit`
`create-rsvp`	destructive	`event_id`, `name`, `email`, `response_type`, `confirm*`, `custom_fields`, `send_confirmation`

create-rsvp emails the attendee by default. Set send_confirmation to false to record an RSVP silently.

Invites

Tool		Parameters
`list-invites`	RO	`event_id*`, `status`, `search`, `limit`
`send-event-invite`	destructive	`event_id`, `email`, `confirm*`

Account

Tool		Parameters
`get-analytics`	RO	`calendar_id`, `event_id`, `start_date`, `end_date`, `timezone`, `unique_only`, `include_series`, `team_id`
`get-team-usage`	RO	`team_id`

Destructive tools

Three tools are annotated destructive, and all three require an explicit confirm parameter:

send-event-invite and create-rsvp email a real person. That cannot be recalled.
delete-event is permanent, and deleting a recurring event removes every instance in the series.

A well-behaved client surfaces these for approval before running them. Check the name and address when your assistant asks.

Plans and limits

About this repository

Found a problem with a tool, or want one that does not exist yet? Open an issue.

Related MCP Servers

View all in Developer Tools View all alternatives

Reviews

No reviews yet — be the first to share how this listing worked for you.

Frequently Asked Questions about AddCal

Add the following block to your claude_desktop_config.json under mcpServers: "mcpServers": { "addcal": { "command": "npx", "args": ["-y", "AddCal"] } }

AllMCPs Directory Badge

Full Badge Customizer

Showcase your server listing on GitHub or your project documentation. Embed this dynamic SVG badge to highlight official listing status and live engagement.

Badge Style:

Live Dynamic SVG Preview

Markdown (GitHub README)

[![AllMCPs](https://allmcps.com/api/badge/addcal-2?style=directory)](https://allmcps.com/mcp/addcal-2)

HTML Embed

<a href="https://allmcps.com/mcp/addcal-2"><img src="https://allmcps.com/api/badge/addcal-2?style=directory" alt="AddCal on AllMCPs" /></a>

Technical Specs & Signals

CategoryDeveloper Tools

52Quality signal: Good · 52/100How this signal is calculated ▾

Server availabilityNot measured

Not scored for repo-hosted servers — we can't reach the running server, only its GitHub page. Hosted MCP endpoints are health-checked live.

Verified ownership10/20

Documentation & tools25/30

Adoption & activity4/15

Community engagement0/10

★ Spotlight Slot

Feature Your MCP Server

Get maximum visibility for your server across our directory, search results, and detail pages.

Spotlight Your Server

Own this project?

Free dofollow backlink: add your website and place the AllMCPs badge on it — no claim needed. We detect it automatically and keep it verified as long as the badge stays live.

Claim & get free dofollow

Share & Embed

Add our SVG badge (dark/light directory styles) or embeddable widget to your site.

Explore more

More in 💻 Developer Tools →Best MCP servers for Developers →Alternatives to AddCal →Install in Claude Desktop Install in Cursor Install in VS Code

AddCal

Quick Install

Client Config & Setup

Documentation Overview

AddCal MCP Server

This is not a Google Calendar MCP

Quick start

Authentication

What you can ask for

Tools

Search

Calendars

Collections

Subscribers

Events

RSVPs

Invites

Account

Destructive tools

Plans and limits

Links

About this repository

Related MCP Servers

Reviews

Frequently Asked Questions about AddCal

AllMCPs Directory Badge

Technical Specs & Signals

Feature Your MCP Server

Own this project?

Share & Embed

Explore more

AddCal

Quick Install

Client Config & Setup

Documentation Overview

AddCal MCP Server

This is not a Google Calendar MCP

Quick start

Authentication

What you can ask for

Tools

Search

Calendars

Collections

Subscribers

Events

RSVPs

Invites

Account

Destructive tools

Plans and limits

Links

About this repository

Related MCP Servers

Reviews

Frequently Asked Questions about AddCal

AllMCPs Directory Badge

Technical Specs & Signals

Feature Your MCP Server

Own this project?

Share & Embed

Explore more